TP6053 Catalago Kohler

Service
Marine Generator Sets
Models:
5EOZ
8EOZ
9EOZ
10EOZ
4EFOZ
6.5EFOZ
8EFOZ
9EFOZ
TP-6053 7/04a
Table of Contents
Safety Precautions and Instructions . . . . . . . . . I 6.3.2 High Water Temperature and

High Exhaust Temperature
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i Shutdown Switch . . . . . . . . . . . . . . . . . . 26
6.4 Controller Circuit Board . . . . . . . . . . . . . . . . . . . . . 27
Service Assistance . . . . . . . . . . . . . . . . . . . . . . . . . i
6.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Section 1 Specifications . . . . . . . . . . . . . . . . . . . . 1
Section 7 Generator Troubleshooting . . . . . . . . 33
1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
1.2 Service Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
7.2 General Troubleshooting . . . . . . . . . . . . . . . . . . . . 33
1.3 Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.3 Separate Excitation . . . . . . . . . . . . . . . . . . . . . . . . 34
1.4 Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.4 PowerBoost IIIE Voltage Regulators . . . . . . . . . . 34
Section 2 Scheduled Maintenance . . . . . . . . . . . 7 7.4.1 Voltage Regulator Test . . . . . . . . . . . . . . 35
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.4.2 Voltage Regulator Adjustment . . . . . . . 35
2.2 Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.5 Exciter Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.3 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.6 Exciter Armature . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.4 Generator Storage . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.7 Rectifier Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.8 Rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Section 3 Intake and Exhaust System . . . . . . . . 11
7.9 Stator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.1 Air Intake Silencer/Filter . . . . . . . . . . . . . . . . . . . . 11
3.2 Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Section 8 Component Troubleshooting . . . . . . 41
3.3 Mixing Elbow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2 Remote Panels (Optional) . . . . . . . . . . . . . . . . . . . 43
Section 4 Fuel System . . . . . . . . . . . . . . . . . . . . . 13
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Section 9 Generator Disassembly/
4.2 Fuel Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.3 Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9.1 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.4 Bleed the Fuel System . . . . . . . . . . . . . . . . . . . . . . 14 9.2 Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.5 Fuel Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Section 10 Voltage Reconnection and
4.6 Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.7 Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 10.1 Voltage Reconnection . . . . . . . . . . . . . . . . . . . . . . 51
Section 5 Cooling System . . . . . . . . . . . . . . . . . . 19 10.1.1 100--120-Volt Configurations . . . . . . . . . 51
10.1.2 100--120/200--240-Volt
5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Configurations . . . . . . . . . . . . . . . . . . . . . 52
5.2 Water-Cooled Exhaust Manifold . . . . . . . . . . . . . . 20 10.1.3 200--240-Volt Configurations . . . . . . . . . 52
5.3 Closed Heat Exchanger . . . . . . . . . . . . . . . . . . . . . 20 10.2 Marine Manual (Ship-to-Shore)
5.4 Fill Check and Coolant . . . . . . . . . . . . . . . . . . . . . 20 Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.5 Flush and Clean Cooling System . . . . . . . . . . . . . 20 10.3 Wiring Diagram, Schematic . . . . . . . . . . . . . . . . . 54
5.6 Pressure Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10.4 Wiring Diagram, Point-to-Point . . . . . . . . . . . . . . . 55
5.7 Impeller Inspection and Replacement . . . . . . . . . 21 10.5 Remote Start Panel . . . . . . . . . . . . . . . . . . . . . . . . 56
5.8 Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 10.6 Remote Start and 2-Meter Panel . . . . . . . . . . . . . 56
5.9 Siphon Break . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 10.7 Remote Start and 4-Meter Panel . . . . . . . . . . . . . 57
5.10 Anticorrosion Zinc Anode . . . . . . . . . . . . . . . . . . . 24
Appendix A Abbreviations . . . . . . . . . . . . . . . . A-1
Section 6 Controller Troubleshooting . . . . . . . . 25
Appendix B Common Hardware Application
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
6.2 Controller Sequence of Operation . . . . . . . . . . . . 25
6.2.1 Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Appendix C General Torque
6.2.2 Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
6.2.3 Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Appendix D Common Hardware
6.3 Engine Safety Shutdown Switches . . . . . . . . . . . 26 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
6.3.1 Low Oil Pressure (LOP) Shutdown . . . 26
Appendix E Common Hardware List . . . . . . . A-6
TP-6053 7/04 Table of Contents

Safety Precautions and Instructions
IMPORTANT SAFETY Accidental Starting Battery electrolyte is a diluted

INSTRUCTIONS. Electromechanical sulfuric acid. Battery acid can cause
equipment, including generator sets, severe injury or death. Battery acid
transfer switches, switchgear, and WARNING can cause blindness and burn skin.
accessories, can cause bodily harm Always wear splashproof safety
and pose life-threatening danger when goggles, rubber gloves, and boots
improperly installed, operated, or when servicing the battery. Do not
maintained. To prevent accidents be open a sealed battery or mutilate the
aware of potential dangers and act battery case. If battery acid splashes in
safely. Read and follow all safety Accidental starting. the eyes or on the skin, immediately
Can cause severe injury or death.
precautions and instructions. SAVE flush the affected area for 15 minutes
THESE INSTRUCTIONS. Disconnect the battery cables before with large quantities of clean water.
working on the generator set. Seek immediate medical aid in the case
This manual has several types of safety Remove the negative (--) lead first of eye contact. Never add acid to a
precautions and instructions: Danger, when disconnecting the battery. battery after placing the battery in
Warning, Caution, and Notice. Reconnect the negative (--) lead last service, as this may result in hazardous
when reconnecting the battery. spattering of battery acid.
Battery acid cleanup. Battery acid

DANGER Disabling the generator set.
can cause severe injury or death.
Accidental starting can cause
severe injury or death. Before Battery acid is electrically conductive
Danger indicates the presence of a
working on the generator set or and corrosive. Add 500 g (1 lb.) of
hazard that will cause severe
equipment connected to the set, bicarbonate of soda (baking soda) to a
personal injury, death, or substantial
disable the generator set as follows: container with 4 L (1 gal.) of water and
property damage.
(1) Place the generator set start/stop mix the neutralizing solution. Pour the
switch in the STOP position. neutralizing solution on the spilled
WARNING (2) Disconnect the power to the battery battery acid and continue to add the
charger, if equipped. (3) Remove the neutralizing solution to the spilled
Warning indicates the presence of a battery cables, negative (--) lead first. battery acid until all evidence of a
hazard that can cause severe Reconnect the negative (--) lead last chemical reaction (foaming) has
personal injury, death, or substantial when reconnecting the battery. Follow ceased. Flush the resulting liquid with
property damage. these precautions to prevent the water and dry the area.
starting of the generator set by the
remote start/stop switch. Battery gases. Explosion can cause
CAUTION severe injury or death. Battery gases
can cause an explosion. Do not smoke
Caution indicates the presence of a Battery or permit flames or sparks to occur near
hazard that will or can cause minor a battery at any time, particularly when
personal injury or property damage. it is charging. Do not dispose of a
WARNING battery in a fire. To prevent burns and
NOTICE sparks that could cause an explosion,
Notice communicates installation, avoid touching the battery terminals
operation, or maintenance information with tools or other metal objects.
that is safety related but not hazard Remove all jewelry before servicing the
related. equipment. Discharge static electricity
Sulfuric acid in batteries. from your body before touching
Safety decals affixed to the equipment Can cause severe injury or death. batteries by first touching a grounded
in prominent places alert the operator metal surface away from the battery. To
or service technician to potential Wear protective goggles and avoid sparks, do not disturb the battery
hazards and explain how to act safely. clothing. Battery acid may cause charger connections while the battery
The decals are shown throughout this blindness and burn skin.
is charging. Always turn the battery
publication to improve operator charger off before disconnecting the
recognition. Replace missing or
battery connections. Ventilate the
damaged decals.
compartments containing batteries to
prevent accumulation of explosive
gases.
TP-6053 7/04 Safety Precautions and Instructions I

Battery short circuits. Explosion Combustible materials. A fire can Copper tubing exhaust systems.
can cause severe injury or death. cause severe injury or death. Carbon monoxide can cause severe
Short circuits can cause bodily injury Generator set engine fuels and fuel nausea, fainting, or death. Do not
and/or equipment damage. vapors are flammable and explosive. use copper tubing in diesel exhaust
Disconnect the battery before Handle these materials carefully to systems. Sulfur in diesel exhaust
generator set installation or minimize the risk of fire or explosion. causes rapid deterioration of copper
maintenance. Remove all jewelry Equip the compartment or nearby area tubing exhaust systems, resulting in
before servicing the equipment. Use with a fully charged fire extinguisher. exhaust/water leakage.
tools with insulated handles. Remove Select a fire extinguisher rated ABC or
Inspecting the exhaust system.
BC for electrical fires or as
the negative (--) lead first when Carbon monoxide can cause severe
recommended by the local fire code or
disconnecting the battery. Reconnect nausea, fainting, or death. For the
an authorized agency. Train all
the negative (--) lead last when safety of the craft’s occupants, install a
personnel on fire extinguisher
reconnecting the battery. Never carbon monoxide detector. Consult the
operation and fire prevention
connect the negative (--) battery cable boat builder or dealer for approved
procedures.
to the positive (+) connection terminal detector location and installation.
of the starter solenoid. Do not test the Inspect the detector before each
battery condition by shorting the Exhaust System generator set use. In addition to routine
terminals together. exhaust system inspection, test the
carbon monoxide detector per the
WARNING manufacturer’s instructions and keep
the detector operational at all times.
Engine Backfire/Flash
Fire Operating the generator set. Carbon
monoxide can cause severe nausea,
fainting, or death. Carbon monoxide
WARNING Carbon monoxide. is an odorless, colorless, tasteless,
Can cause severe nausea, nonirritating gas that can cause death if
fainting, or death. inhaled for even a short time. Use the
following precautions when installing
The exhaust system must be and operating the generator set. Do not
Fire. leakproof and routinely inspected.
install the exhaust outlet where exhaust
Can cause severe injury or death. can be drawn in through portholes,
Carbon monoxide symptoms. vents, or air conditioners. If the
Do not smoke or permit flames or Carbon monoxide can cause severe generator set exhaust discharge outlet
sparks near fuels or the fuel system. nausea, fainting, or death. Carbon is near the waterline, water could enter
monoxide is a poisonous gas present in the exhaust discharge outlet and close
Servicing the air cleaner. A sudden exhaust gases. Carbon monoxide or restrict the flow of exhaust. Never
backfire can cause severe injury or poisoning symptoms include but are operate the generator set without a
death. Do not operate the generator not limited to the following: functioning carbon monoxide detector.
set with the air cleaner/silencer ! Light-headedness, dizziness Be especially careful if operating the
removed. ! Physical fatigue, weakness in generator set when moored or
joints and muscles anchored under calm conditions
Combustible materials. A sudden
! Sleepiness, mental fatigue, because gases may accumulate. If
flash fire can cause severe injury or
inability to concentrate operating the generator set dockside,
death. Do not smoke or permit flames
or speak clearly, blurred vision moor the craft so that the exhaust
or sparks near the fuel system. Keep
! Stomachache, vomiting, nausea discharges on the lee side (the side
the compartment and the generator set
If experiencing any of these symptoms sheltered from the wind). Always be
clean and free of debris to minimize the
and carbon monoxide poisoning is aware of others, making sure your
risk of fire. Wipe up spilled fuels and
possible, seek fresh air immediately exhaust is directed away from other
engine oil.
and remain active. Do not sit, lie down, boats and buildings. Avoid overloading
or fall asleep. Alert others to the the craft.
possibility of carbon monoxide
poisoning. Seek medical attention if
the condition of affected persons does
not improve within minutes of breathing
fresh air.
II Safety Precautions and Instructions TP-6053 7/04

Fuel System Pipe sealant. Explosive fuel vapors Hazardous Voltage
can cause severe injury or death.
Fuel leakage can cause an explosion.
WARNING Use pipe sealant on all threaded fittings WARNING
to prevent fuel leakage. Use pipe
sealant that resists gasoline, grease,
lubrication oil, common bilge solvents,
salt deposits, and water.
Ignition-protected equipment. Hazardous voltage. Moving rotor.
Explosive fuel vapors. Explosive fuel vapors can cause Can cause severe injury or death.
Can cause severe injury or death. severe injury or death. Gasoline Operate the generator set only when
vapors can cause an explosion. all guards and electrical enclosures
Use extreme care when handling,
USCG Regulation 33CFR183 requires are in place.
storing, and using fuels.
that all electrical devices (ship-to-shore
transfer switch, remote start panel,
Draining the fuel system. Explosive etc.) must be ignition protected when
fuel vapors can cause severe injury used in a gasoline and gaseous-fueled CAUTION
or death. Spilled fuel can cause an environment. The electrical devices
explosion. Use a container to catch fuel listed above are not ignition protected
when draining the fuel system. Wipe up and are not certified to operate in a
spilled fuel after draining the system. gasoline and gaseous-fueled
environment such as an engine room or
Installing the fuel system. Explosive
near fuel tanks. Acceptable locations Welding the generator set.
fuel vapors can cause severe injury Can cause severe electrical
are the wheelhouse and other living
or death. Fuel leakage can cause an equipment damage.
areas sheltered from rain and water
explosion. Do not modify the tank or
splash.
the propulsion engine fuel system. Never weld components of the
Equip the craft with a tank that allows generator set without first
one of the two pickup arrangements disconnecting the battery, controller
described in the installation section.
Hazardous Noise wiring harness, and engine electronic
The tank and installation must conform control module (ECM).
to USCG Regulations. CAUTION
Grounding electrical equipment.
The fuel system. Explosive fuel Hazardous voltage can cause
vapors can cause severe injury or severe injury or death. Electrocution
death. Vaporized fuels are highly is possible whenever electricity is
explosive. Use extreme care when present. Open the main circuit
handling and storing fuels. Store fuels breakers of all power sources before
in a well-ventilated area away from Hazardous noise.
Can cause hearing loss. servicing the equipment. Configure the
spark-producing equipment and out of installation to electrically ground the
the reach of children. Never add fuel to Never operate the generator set generator set, transfer switch, and
the tank while the engine is running without a muffler or with a faulty related equipment and electrical
because spilled fuel may ignite on exhaust system. circuits to comply with applicable codes
contact with hot parts or from sparks. and standards. Never contact
Do not smoke or permit flames or electrical leads or appliances when
Engine noise. Hazardous noise can
sparks to occur near sources of spilled standing in water or on wet ground
cause hearing loss. Generator sets
fuel or fuel vapors. Keep the fuel lines because these conditions increase the
not equipped with sound enclosures
and connections tight and in good risk of electrocution.
can produce noise levels greater than
condition. Do not replace flexible fuel
105 dBA. Prolonged exposure to noise
lines with rigid lines. Use flexible
levels greater than 85 dBA can cause
sections to avoid fuel line breakage
permanent hearing loss. Wear hearing
caused by vibration. Do not operate the
protection when near an operating
generator set in the presence of fuel
generator set.
leaks, fuel accumulation, or sparks.
Repair fuel systems before resuming
generator set operation.
TP-6053 7/04 Safety Precautions and Instructions III

Disconnecting the electrical load. Electrical backfeed to the utility. Hot Parts
Hazardous voltage can cause Hazardous backfeed voltage can
severe injury or death. Disconnect cause severe injury or death.
the generator set from the load by Connect the generator set to the WARNING
opening the line circuit breaker or by building/marina electrical system only
disconnecting the generator set output through an approved device and after
leads from the transfer switch and the building/marina main switch is
heavily taping the ends of the leads. opened. Backfeed connections can
High voltage transferred to the load cause severe injury or death to utility Hot coolant and steam.
during testing may cause personal personnel working on power lines Can cause severe injury or death.
injury and equipment damage. Do not and/or personnel near the work area.
use the safeguard circuit breaker in Some states and localities prohibit Before removing the pressure cap,
place of the line circuit breaker. The unauthorized connection to the utility stop the generator set and allow it to
safeguard circuit breaker does not electrical system. Install a cool. Then loosen the pressure cap
disconnect the generator set from the ship-to-shore transfer switch to prevent to relieve pressure.
load. interconnection of the generator set
power and shore power.
Welding the generator set. Can WARNING
cause severe electrical equipment Testing live electrical circuits.
damage. Before welding the generator Hazardous voltage or current can
set perform the following steps: cause severe injury or death. Have
(1) Remove the battery cables, trained and qualified personnel take
negative (--) lead first. (2) Disconnect diagnostic measurements of live
all engine electronic control module circuits. Use adequately rated test Hot engine and exhaust system.
(ECM) connectors. (3) Disconnect all equipment with electrically insulated Can cause severe injury or death.
generator set controller and voltage probes and follow the instructions of the Do not work on the generator set until
regulator circuit board connectors. test equipment manufacturer when it cools.
(4) Disconnect the engine battery- performing voltage tests. Observe the
charging alternator connections. following precautions when performing
Checking the coolant level. Hot
(5) Attach the weld ground connection voltage tests: (1) Remove all jewelry.
coolant can cause severe injury or
close to the weld location. (2) Stand on a dry, approved electrically
death. Allow the engine to cool.
insulated mat. (3) Do not touch the
Short circuits. Hazardous Release pressure from the cooling
enclosure or components inside the
voltage/current can cause severe system before removing the pressure
enclosure. (4) Be prepared for the
injury or death. Short circuits can cap. To release pressure, cover the
system to operate automatically.
cause bodily injury and/or equipment pressure cap with a thick cloth and then
(600 volts and under)
damage. Do not contact electrical slowly turn the cap counterclockwise to
connections with tools or jewelry while the first stop. Remove the cap after
making adjustments or repairs. pressure has been completely
Remove all jewelry before servicing the released and the engine has cooled.
equipment. Check the coolant level at the tank if the
generator set has a coolant recovery
Testing the voltage regulator. tank.
Hazardous voltage can cause
severe injury or death. High voltage Servicing the exhaust system. Hot
is present at the voltage regulator heat parts can cause severe injury or
sink. To prevent electrical shock do not death. Do not touch hot engine parts.
touch the voltage regulator heat sink The engine and exhaust system
when testing the voltage regulator. components become extremely hot
(PowerBoost", PowerBoost" III, and during operation.
PowerBoost" V voltage regulator
models only)
IV Safety Precautions and Instructions TP-6053 7/04

Moving Parts Tightening the hardware. Flying NOTICE
projectiles can cause severe injury Voltage reconnection. Affix a notice
or death. Loose hardware can cause to the generator set after reconnecting
WARNING the hardware or pulley to release from the set to a voltage different from the
the generator set engine and can cause voltage on the nameplate. Order
personal injury. Retorque all voltage reconnection decal 246242
crankshaft and rotor hardware after from an authorized service
servicing. Do not loosen the crankshaft distributor/dealer.
Hazardous voltage. Moving rotor. hardware or rotor thrubolt when making
Can cause severe injury or death. adjustments or servicing the generator NOTICE
set. Rotate the crankshaft manually in Hardware damage. The engine and
Operate the generator set only when a clockwise direction only. Turning the generator set may use both American
all guards and electrical enclosures crankshaft bolt or rotor thrubolt Standard and metric hardware. Use
are in place. counterclockwise can loosen the the correct size tools to prevent
hardware. rounding of the bolt heads and nuts.
WARNING Servicing the generator set when it

is operating. Exposed moving parts NOTICE
can cause severe injury or death. When replacing hardware, do not
Keep hands, feet, hair, clothing, and substitute with inferior grade
test leads away from the belts and hardware. Screws and nuts are
pulleys when the generator set is available in different hardness ratings.
running. Replace guards, screens, and To indicate hardness, American
Rotating parts.
covers before operating the generator Standard hardware uses a series of
set. markings, and metric hardware uses a
Operate the generator set only when numeric system. Check the markings
all guards, screens, and covers are in Sound shield removal. Exposed on the bolt heads and nuts for
place. moving parts can cause severe identification.
injury or death. The generator set
must be operating in order to perform NOTICE
WARNING some scheduled maintenance
Fuse replacement. Replace fuses
procedures. Be especially careful if the with fuses of the same ampere rating
sound shield has been removed, and type (for example: 3AB or 314,
leaving the belts and pulleys exposed.
ceramic). Do not substitute clear
(Sound-shield-equipped models only) glass-type fuses for ceramic fuses.
Refer to the wiring diagram when the
Airborne particles. ampere rating is unknown or
Can cause severe injury or
Notice questionable.
blindness.
NOTICE NOTICE
Wear protective goggles and clothing Saltwater damage. Saltwater quickly
when using power tools, hand tools, This generator set has been deteriorates metals. Wipe up saltwater
or compressed air. rewired from its nameplate voltage on and around the generator set and
to remove salt deposits from metal
surfaces.
246242
TP-6053 7/04 Safety Precautions and Instructions V

Introduction
This manual provides troubleshooting and repair Read this manual and carefully follow all procedures
instructions for 5--10EOZ/EFOZ model generator sets, and safety precautions to ensure proper equipment
controllers, and accessories. operation and to avoid bodily injury. Read and follow the
Safety Precautions and Instructions section at the
Refer to the engine service manual for generator set beginning of this manual. Keep this manual with the
engine service information. equipment for future reference.
x:in:001:001
This manual may be used for models not listed on the The equipment service requirements are important for
front cover. safe and efficient operation. Inspect the parts often and
perform required service at the prescribed intervals.
Information in this publication represents data available Maintenance work must be performed by appropriately
at the time of print. Kohler Co. reserves the right to skilled and suitably-trained maintenance personnel
change this publication and the products represented familiar with generator set operation and service.
without notice and without any obligation or liability x:in:001:003
whatsoever.
Service Assistance
For professional advice on generator power China

requirements and conscientious service, please contact North China Regional Office, Beijing
your nearest Kohler distributor or dealer. Phone: (86) 10 6518 7950
(86) 10 6518 7951
! Consult the Yellow Pages under the heading (86) 10 6518 7952
Generators—Electric Fax: (86) 10 6518 7955
! Visit the Kohler Power Systems website at East China Regional Office, Shanghai
KohlerPowerSystems.com Phone: (86) 21 6288 0500
Fax: (86) 21 6288 0550
! Look at the labels and stickers on your Kohler product India, Bangladesh, Sri Lanka
or review the appropriate literature or documents India Regional Office
included with the product Bangalore, India
Phone: (91) 80 3366208
! Call toll free in the US and Canada 1-800-544-2444 (91) 80 3366231
Fax: (91) 80 3315972
! Outside the US and Canada, call the nearest regional
office Japan, Korea
North Asia Regional Office
Headquarters Europe, Middle East, Africa Tokyo, Japan
(EMEA) Phone: (813) 3440-4515
Kohler Power Systems Fax: (813) 3440-2727
ZI Senia 122
Latin America
12, rue des Hauts Flouviers
Latin America Regional Office
94517 Thiais Cedex
Lakeland, Florida, USA
France
Phone: (863) 619-7568
Phone: (33) 1 41 735500
Fax: (863) 701-7131
Fax: (33) 1 41 735501
Asia Pacific
Power Systems Asia Pacific Regional Office
Singapore, Republic of Singapore
Phone: (65) 6264-6422
Fax: (65) 6264-6455
TP-6053 7/04 Introduction i

Product Information Engine Identification
Record the product identification information from the
Product identification numbers determine service parts. engine nameplate.
Record the product identification numbers in the spaces
Manufacturer
below immediately after unpacking the products so that
the numbers are readily available for future reference. Model Number
Record field-installed kit numbers after installing the Serial Number
kits.
Generator Set Identification Numbers

Record the product identification numbers from the
generator set nameplate(s).
Model Number
Specification Number
Serial Number
Accessory Number Accessory Description
ii Introduction TP-6053 7/04

Section 1 Specifications
1.1 General The 9EOZ/8EFOZ models are powered by a Yanmar

three-cylinder, water-cooled, four-cycle diesel engine.
This manual covers the operation, maintenance, The three-cylinder engine with heat exchanger is model
troubleshooting, and repair of the alternating current 3TNE78A.
marine generator sets.
The 10EOZ/9EFOZ models are powered by a Yanmar
Have an authorized service dealer/distributor perform three-cylinder, water-cooled, four-cycle diesel engine.
required servicing to assure your unit continues to meet The three-cylinder engine with heat exchanger is model
USCG requirements. 3TNE82A.
Please take a few moments to read this manual, then Kohler Co. develops all Kohler! marine generator set
carefully follow all service recommendations. See ratings using accepted reference conditions of 25"C
Figure 1-1 through Figure 1-3 for identification and (77"F) and pressure of 98.9 kPa (29.2 in. Hg) dry
location of components. barometer. ISO 3046 and ISO 8528-1 include reference
conditions and output calculations. Obtain technical
The 5EOZ/4EFOZ models are powered by a Yanmar information bulletin (TIB-101) on ratings guidelines for
three-cylinder, water-cooled, four-cycle diesel engine. complete ratings definitions.
The three-cylinder engine with heat exchanger is model
3TNE68.
The 8EOZ/6.5EFOZ models are powered by a Yanmar

three-cylinder, water-cooled, four-cycle diesel engine.
The three-cylinder engine with heat exchanger is model
3TNE74.
TP-6053 7/04 Section 1 Specifications 1

1.2 Service Views
2 3 4 5 6 7 8 9 10 11
12
13
25
14
24
15
16
17
23 22 21 20 19 18
26 27 28 29
34
30
31
DK-250000
1. Start/stop switch 33 32 18. Anticorrosion zinc anode
2. Hourmeter 19. Fuel filter
3. Controller 20. Oil filter
4. Nameplate 21. Oil drain valve and hose
5. DC circuit breaker 22. Fuel feed pump
6. AC circuit breaker 23. Oil check
7. Air cleaner 24. Fuel inlet connection
8. Fuel solenoid 25. Low oil pressure safety shutdown switch
9. Fuel injectors 26. Wet exhaust manifold
10. Fuel return connection 27. Thermostat
11. High water temperature switch 28. AC load lead connector
12. Oil fill 29. Remote start connector
13. V-belts 30. High exhaust temperature safety shutdown switch
14. Seawater pump (water inlet) 31. Mixing elbow
15. Coolant (fresh water) drain 32. Water temperature sender
16. Heat exchanger 33. Engine starter
17. Coolant drain (fresh water) 34. Battery charging alternator
Figure 1-1 Generator Set Service View (5EOZ/4EFOZ)
2 Section 1 Specifications TP-6053 7/04

2 3 4 5 6 7 8 9 10
11
1
12
13
14
15
24
23 22 21 20 19 18 17 16
25 26 27 28
33
29
30
A-358000A-A
32 31
1. Start/stop switch 18. Fuel filter
2. Controller 19. Oil filter
3. Nameplate 20. Oil drain valve and hose
4. Hourmeter 21. Fuel feed pump
5. DC circuit breaker 22. Oil check
6. AC circuit breaker 23. Fuel inlet connection
7. Air cleaner 24. Low oil pressure safety shutdown switch
8. Coolant recovery bottle
25. Wet exhaust manifold
9. Pressure cap
26. Thermostat
10. Fuel return connection
11. High water temperature shutdown switch 27. AC load lead connector
12. Oil fill 28. Remote start connector
13. Seawater pump (water inlet) 29. High exhaust temperature safety shutdown switch
14. V-belts 30. Mixing elbow
15. Heat exchanger 31. Engine starter
16. Coolant drain (fresh water) 32. Water temperature sender
17. Anticorrosion zinc anode 33. Battery charging alternator
Figure 1-2 Generator Set Service View (8EOZ/6.5EFOZ)

3 4 5 6 7 8 9 10 11 12
1
11
13
22
14
21
20 19 18 17 16 15
23 24 25 26
34
27
28
33
A-358000A-A
32 31 30 29
1. Start/stop switch 18. Fuel feed pump
2. Controller 19. Fuel inlet connection
3. Nameplate 20. Oil check
4. Hourmeter 21. Coolant drain (fresh water)
5. DC circuit breaker 22. Fuel return
6. AC circuit breaker 23. Wet exhaust manifold
7. Air cleaner 24. Thermostat
8. Coolant overflow bottle 25. AC load lead connector
9. Low oil pressure safety shutdown switch 26. Remote start connector
10. Pressure cap 27. High exhaust temperature safety shutdown switch
11. Oil fill 28. Mixing elbow
12. High water temperature safety shutdown switch 29. Anticorrosion zinc anode
13. V-belts 30. Engine starter
14. Seawater pump (water inlet) 31. Heat exchanger
15. Fuel filter 32. Coolant drain (fresh water)
16. Oil drain valve and hose 33. Water temperature sender
17. Oil filter 34. Battery charging alternator
Figure 1-3 Generator Set Service View (9/10EOZ and 8/9EFOZ)

1.3 Engine
Generator Model 5EOZ/4EFOZ 8EOZ/6.5EFOZ 9EOZ/8EFOZ 10EOZ/9EFOZ
Engine manufacturer Yanmar
Engine model 3TNE68 3TNE74 3TNE78A 3TNE82A
Number of cylinders 3
Cylinder block material Cast iron
Cylinder head material Cast iron
Piston rings 2 compression/1 oil
Crankshaft material Stamped forging
Connecting rod material Forged carbon steel
Governor Centrifugal, mechanical
Bore x stroke, mm (in.) 68 x 72 (2.67 x 2.83) 74 x 78 (2.91 x 3.07) 78 x 84 (3.07 x 3.30) 82 x 84 (3.22 x 3.30)
Displacement, L (CID) 0.784 (47.83) 1.006 (61.39) 1.204 (73.45 ) 1.330 (81.14)
Compression ratio 23.0:1 18.0:1
Horsepower, 60/50 Hz 10.1/8.4 14/11.6 17.7/14.8
RPM, 60/50 Hz 1800/1500
Direction of rotation
Counterclockwise
(as viewed from generator end)
Lubrication system Pressure, trochoid pump
Lube oil capacity w/filter, L (qts.) 3 (3.2) 2.4 (2.3) 5.2 (5.5) 3.4 (3.6)
Oil recommendation, API CD, CD/CC, or CC
Engine firing order
1-3-2
(#1 cylinder nearest to flywheel)
Fuel injection timing (BTDC) 14°±1° 16° ±1° 10° ±1°
Fuel injection pressure,
120 (1706) 200 (2844)
kg/cm sq. (psi)
Indirect injection,
Combustion system Direct injection
swirl precombustion chamber
Battery voltage 12 volt, negative ground
Battery recommendation, min. 500 CCA, 100 amp hr.
Battery charging (alternator) 40 amps @ 12 volts 50 amps @ 12 volts
Fuel recommendation Diesel, ISO 8217 DMA, BS 2869 Part 1 Class A1 or Part 2 Class A2
Fuel shutoff solenoid system Electric
Fuel feed pump Electric, rotary vane
Fuel pump priming Electric
Max. recommended fuel pump
1.2 (4)
lift, m (ft.)
Coolant capacity, L (qts.) 1.8 (1.9) 3.9 (4.12) 5.2 (5.5)
Coolant recovery tank capacity,
0.24 (8.0)
L (oz.)
Recommended coolant 50% ethylene glycol; 50% clean, softened water
Thermostat 71°C (160°F)
Pressure cap rating, kPa (psi) 96.5 (14.0)
1.8 kW Bendix,
Starter motor 0.8 kW Bendix automotive type
gear-reduction automotive type

Engine (continued)
Generator Model 5EOZ/4EFOZ 8EOZ/6.5EFOZ 9EOZ/8EFOZ 10EOZ/9EFOZ
Intake/exhaust valve clearance
0.15--0.25 (0.006--0.010)
(cold), mm (in.)
Belt tension (force) @ 10 kg
10--15 (0.4--0.6)
(22 lbs.), mm (in.)
Flex plate to rotor bolt torque
45 (35) 36.6 (27) 45 (35) 38 (28)
(3/8-16), Nm (ft. lbs.)
Flex plate to flywheel bolt torque
25 (20) 38 (28) 25 (20) 19 (14)
(M8-1.25), Nm (ft. lbs.)
Overbolt torque (M10-1.5),
45 (35) 34 (25) 45 (35) 34 (25)
Nm (ft. lbs.)
Inlet water line hose ID
16 (5/8)
(seawater pump inlet), mm (in.)
Outlet water line hose ID
51 (2)
(mixing elbow outlet), mm (in.)
Fuel inlet (fuel pump inlet) 1/4 NPT
Fuel return size type 1/4 NPT
1.4 Generator
Generator Model 5/8EOZ and 4/6.5EFOZ 9/10EOZ and 8/9EFOZ
Hot exciter field voltage/current readings at rated voltage*
No load (63 Hz) (volts/amps) 19/0.9 12/0.8
Full load (60 Hz) (volts/amps) 32/1.5 33/2.2
Resistor (F1 lead to exciter field) (ohms) 15 ±2 10 ±2
Cold exciter field resistance (ohms) 4.8
Cold exciter armature resistance (ohms) 1.2
Cold main field (rotor) resistance (ohms) 5.0 5.7
Stator output voltages with separately excited generator, using 12-volt battery (60 Hz only)*
1--2, 3--4, 33--44 (volts) 81 115
33--55 (volts) 105 155
B1-B2 (volts) 10 15
Cold stator resistance
1--2, 3--4, 33--44 (ohms) 0.3 0.2
33--55 (ohms) 2.1 1.9
B1-B2 (ohms) 0.1
* Includes resistor in exciter field circuit.

Section 2 Scheduled Maintenance
2.1 General Sound shield removal. Exposed moving parts can cause
severe injury or death. The generator set must be operating
in order to perform some scheduled maintenance procedures.
WARNING Be especially careful if the sound shield has been removed,
leaving the belts and pulleys exposed.
(Sound-shield-equipped models only)
NOTICE
Saltwater damage. Saltwater quickly deteriorates metals.
Accidental starting. Wipe up saltwater on and around the generator set and
Can cause severe injury or death. remove salt deposits from metal surfaces.
Disconnect the battery cables before Note: See the generator set operation manual for the
working on the generator set.
service schedule and other service not included
Remove the negative (--) lead first
when disconnecting the battery. in this manual.
Reconnect the negative (--) lead last
when reconnecting the battery.
2.2 Lubrication System
Disabling the generator set. Accidental starting can The following paragraphs describe the engine
cause severe injury or death. Before working on the lubrication system.
generator set or equipment connected to the set, disable the
generator set as follows: (1) Place the generator set start/stop Use oil that meets the American Petroleum Institute
switch in the STOP position. (2) Disconnect the power to the (API) classification of CD, CC/CD, or CC. Using
battery charger, if equipped. (3) Remove the battery cables,
unsuitable oil or neglecting an oil change may result in
negative (--) lead first. Reconnect the negative (--) lead last
when reconnecting the battery. Follow these precautions to
damage and a shorter engine life. Figure 2-1 shows the
prevent the starting of the generator set by the remote recommended Society of Automotive Engineers (SAE)
start/stop switch. viscosity designation for given operating temperature
ranges.
WARNING Note: Failure to observe these standards may cause
inadequate lubrication/oil pressure and cold-
starting difficulties.
5W20
SAE
Rotating parts. Service
Grade 20W40
10W30
Operate the generator set only when
all guards, screens, and covers are in 20W20
place.
20W30
Servicing the generator set when it is operating. Exposed 20W40

moving parts can cause severe injury or death. Keep
hands, feet, hair, clothing, and test leads away from the belts °C --30 --20 --10 0 10 20 30 40 °C
and pulleys when the generator set is running. Replace
guards, screens, and covers before operating the generator °F 0 20 40 60 80 100 °F
Operating Temperature TP-5856-1
set.
Figure 2-1 Engine Oil Selection
TP-6053 7/04 Section 2 Scheduled Maintenance 7

Electric Oil-Drain/Oil-Fill Procedure 2.3 Battery
1. Connect the pump to the end of the oil-drain hose. Consult the battery manufacturer’s instructions
regarding battery care and maintenance.
2. Place the pump outlet hose into a container.
Remove the oil-fill cap(s). One is located near the
top of the engine on the valve cover and one is WARNING
located near the governor.
3. Activate the pump until all of the oil is removed.

Allow ample time for all of the oil to drain.
4. Turn the valve at the base of the oil-drain hose to

the closed position. Sulfuric acid in batteries.
5. Replace the engine oil filter.
Wear protective goggles and
6. Fill the engine crankcase to the specified level with clothing. Battery acid may cause
blindness and burn skin.
oil. The figures in Section 1 show typical oil fill
locations. See Figure 2-1 for oil selection and
Figure 2-2 for oil capacities. Battery electrolyte is a diluted sulfuric acid. Battery acid
can cause severe injury or death. Battery acid can cause
7. Start the generator set and check for oil leaks. blindness and burn skin. Always wear splashproof safety
goggles, rubber gloves, and boots when servicing the battery.
8. Stop the generator set. Check the oil level. Add oil, Do not open a sealed battery or mutilate the battery case. If
as necessary, to bring the level up to the Max mark battery acid splashes in the eyes or on the skin, immediately
on the dipstick. flush the affected area for 15 minutes with large quantities of
clean water. Seek immediate medical aid in the case of eye
Model L (Qts.) contact. Never add acid to a battery after placing the battery in
service, as this may result in hazardous spattering of battery
5EOZ and 4EFOZ 3.0 (3.2)
acid.
8EOZ and 6.5EFOZ 2.3 (2.4)
9EOZ and 8EFOZ 5.2 (5.5) Battery gases. Explosion can cause severe injury or
death. Battery gases can cause an explosion. Do not smoke
10EOZ and 9EFOZ 5.2 (5.5)
or permit flames or sparks to occur near a battery at any time,
Figure 2-2 Oil Capacities particularly when it is charging. Do not dispose of a battery in a
fire. To prevent burns and sparks that could cause an
explosion, avoid touching the battery terminals with tools or
other metal objects. Remove all jewelry before servicing the
equipment. Discharge static electricity from your body before
touching batteries by first touching a grounded metal surface
away from the battery. To avoid sparks, do not disturb the
battery charger connections while the battery is charging.
Always turn the battery charger off before disconnecting the
battery connections. Ventilate the compartments containing
batteries to prevent accumulation of explosive gases.
8 Section 2 Scheduled Maintenance TP-6053 7/04

2.4 Generator Storage 7. Stop the generator set.
Perform the generator storage procedure while the craft 8. Connect the hose to the seacock. Leave the
is afloat. Follow the procedure below when storing your seacock closed.
generator set for 3 months or more.
9. Check the coolant level in the heat exchanger and
add coolant if necessary.
Storage Procedure
Note: Use antifreeze with the lowest available
1. Start and run the generator set until it reaches
temperature rating.
operating temperature, about 30 minutes.
10. Clean the exterior of the generator set and spread
2. Stop the generator set.
a light film of oil or silicon spray over any exposed
3. Change the oil and oil filter. See the generator set surfaces which may be subject to rust or corrosion.
operation manual.
11. Disconnect and remove the battery. Place the
4. Drain the seawater from the heat exchanger by battery in a dry location for the storage period.
removing the coolant drain plug. Recharge the battery once a month to maintain a
full charge.
5. Close the seacock and remove the hose at the
seacock. Place the hose in a container having 12. Cover the entire unit with a breathable dust cover.
approximately 3.7--7.5 L (1--2 gal.) of marine
antifreeze. Use an environmentally safe marine
antifreeze with corrosion inhibitors.
6. With a container at the exhaust outlet, run the

generator set until coolant discharges at the
exhaust outlet or until depleting the coolant
mixture. Do not allow the coolant mixture to flow
into waterways.
TP-6053 7/04 Section 2 Scheduled Maintenance 9

Section 3 Intake and Exhaust System
3.1 Air Intake Silencer/Filter Check for exhaust leaks and blockages. Check the
silencer and piping condition and check for tight exhaust
A dry-type air cleaner silences and filters the intake air. system connections.
The air intake silencer assembly connects to the intake
manifold via a flexible hose. Inspect the exhaust system components (exhaust
manifold, mixing elbow, exhaust line, hose clamps,
At the interval specified in the service schedule, clean or silencer, and outlet flapper) for cracks, leaks, and
replace the air intake silencer. Clean or replace the air corrosion.
cleaner more frequently in dirty, dusty conditions.
Follow the procedure described below. ! Check the hoses for softness, cracks, leaks, or dents.
Replace the hoses as needed.
Air Cleaner Service/Replacement Procedure ! Check for corroded or broken metal parts and replace
1. Release the four spring clips to open the housing them as needed.
and remove the air silencer element.
! Check for loose, corroded, or missing clamps.
2. Tap the element lightly against a flat surface to Tighten or replace the hose clamps and/or hangers
dislodge loose surface dirt. Do not clean the as needed.
element in any liquid or use compressed air as
! Check that the exhaust outlet is unobstructed.
these will damage the filter element.
! Visually inspect for exhaust leaks. Check for carbon
3. Examine the element and its housing for damage
and wear. Replace the element or its housing, if or soot residue on exhaust components. Carbon and
soot residue indicates an exhaust leak. Seal leaks as
necessary.
needed.
4. Wipe the cover and base with a clean rag to remove
! Ensure that the carbon monoxide detector is (1) in the
any dirt. Make sure the sealing surfaces fit
craft, (2) functional, and (3) energized whenever the
correctly and reattach the spring clips.
generator set operates.
3.2 Exhaust System 3.3 Mixing Elbow

WARNING Check the mixing elbow for carbon buildup and
corrosion inside the pipe. Clean the residual carbon
buildup with a wire brush. Inspect the exhaust manifold
flange for cracking and corrosion. The mixing elbow
combines high temperature exhaust and cooling
Carbon monoxide. seawater. The mixture, when exposed to engine
Can cause severe nausea, vibration, makes conditions conducive to rapid
fainting, or death. deterioration and failure if not correctly maintained. If
any damage is detected with the mixing elbow or other
The exhaust system must be
leakproof and routinely inspected. exhaust components, replace the damaged components
to prevent engine exhaust (carbon monoxide) leakage.
Inspecting the exhaust system. Carbon monoxide can
cause severe nausea, fainting, or death. For the safety of
the craft’s occupants, install a carbon monoxide detector.
Consult the boat builder or dealer for approved detector
location and installation. Inspect the detector before each
generator set use. In addition to routine exhaust system
inspection, test the carbon monoxide detector per the
manufacturer’s instructions and keep the detector operational
at all times.
TP-6053 7/04 Section 3 Intake and Exhaust System 11

Section 4 Fuel System
4.1 General 4.3 Fuel Filter

In most installations, both the generator set and the The quality and condition of the fuel largely determine
propulsion engine operate from a common fuel tank with the filter’s useful life. Replace the fuel filter element
a dual dip tube arrangement. The generator set dip tube according to the service schedule. Section 1.2 shows
is shorter than the propulsion engine’s dip tube. With the location of the fuel filter. There are two types of fuel
this arrangement, fuel may not be available to the filtering systems, the spin-on fuel filter and the fuel filter
generator set when the fuel supply is low. See element. Use the applicable procedure below to replace
Figure 4-1 for a fuel system schematic. the fuel filter. See Figure 4-2 or Figure 4-3.
Spin-On Fuel Filter Replacement Procedure

To fuel
pump 1. Place the generator set start/stop switch in the
STOP position.
Propulsion 4
2 3 2. Disconnect the generator set engine starting
Engine
battery, negative (--) lead first.
3. Close the fuel supply valve.

Generator
Set 4. Remove the fuel filter. See Figure 4-2.
5. Clean the contact surface of the fuel filter adapter.

1
6. Lightly lubricate the gasket surface of the new fuel
1. Fuel tank filter with fresh fuel. Thread the filter onto the
2. Dual dip tubes adapter until the gasket makes contact;
3. Fuel filter hand-tighten the filter an additional one-half turn.
4. Fuel feed pump
Figure 4-1 Fuel System Schematic Typical 7. Open the fuel supply valve.
8. Reconnect the generator set engine starting

4.2 Fuel Specifications battery, negative (--) lead last.
Use a clean, good quality diesel fuel oil with a cetane 9. Bleed the fuel system. See Section 4.4.
number of 45 or greater. Clean fuel prevents diesel fuel
injectors and pumps from clogging.
1
Fuel Recommendation
ISO 8217 DMA, BS 2869 Part 1 Class

United States 2
A1 or Part 2 Class A2
United Kingdom BS 2869-1983, Part 2 Class A2
Germany DIN 51 601-1978
3
<
4 <
<
<
TP-606111
1. Fuel filter adapter

2. Fuel filter
3. Removal (counterclockwise)
4. Installation (clockwise)
Figure 4-2 Spin-On Fuel Oil Filter
TP-6053 7/04 Section 4 Fuel System 13

Fuel Filter Element Replacement Procedure 4.4 Bleed the Fuel System
1. Place the generator set start/stop switch in the Bleed the air from the fuel system to prevent starting
STOP position. failures and/or erratic operation. One or more of the
following causes air to collect in the fuel system:
2. Disconnect the generator set engine starting
1. The generator set operates until the fuel supply is
3. Close the fuel supply valve. emptied.
4. Remove the retaining ring, filter cup, o-ring, fuel 2. The air leaks in the suction side of the fuel system.
filter element and spring.
3. Replacing the fuel filter.
5. Replace the fuel filter element and install as shown
4. Vapor lock.
in Figure 4-3.
Note: Connect the battery during the priming procedure
6. Open the fuel supply valve.
to allow engine cranking. Do not allow the
7. Reconnect the generator set engine starting engine/generator to start. To prevent starting,
battery, negative (--) lead last. toggle the start/stop switch by momentarily
placing the start/stop switch in the START
8. Bleed the fuel system. See Section 4.4. position for a few seconds and then placing the
switch in the STOP position. Close the seacock
during bleeding.
2 Fuel System Bleeding Procedure
1. Loosen the fuel filter screw at position 1. See

1 Figure 4-4.
3
2. Toggle the start/stop switch until fuel, free of air
bubbles, flows from the vent screw at position 1.
4 Tighten the screw.
3. Loosen the fuel filter screw at position 2.

5
bubbles, flows from the vent screw at position 2.
6
Tighten the screw.
5. Loosen the fuel injection pump screw at position 5.

7 bubbles, flows from the vent screw at position 5.
Tighten the screw.
TP-561633
1. Fuel strainer assembly 5. O-ring

2. Body 6. Filter cup
3. Fuel element 7. Retaining ring
4. Spring
Figure 4-3 Fuel Oil Filter Element
14 Section 4 Fuel System TP-6053 7/04

5/8EOZ and 4/6.5EFOZ Models 4.5 Fuel Solenoid
1
2
The fuel solenoid serves to pull the injector pump lever
to the fuel-on position when energized. The fuel
solenoid is spring loaded to return the injector-pump
lever to the fuel-off position when deenergized.
6 The generators in this manual use a 3-lead fuel

5 solenoid. This solenoid has a white lead (P) which
energizes the pull-in coil only during cranking. During
operation, the red lead energizes the hold coil and the
black lead is the common ground.
Current (amps) and resistance readings are shown in

Figure 4-5. Resistance readings determine if the
solenoid windings are open or shorted. These readings
must be taken with fuel solenoid disconnected from
4
engine wiring harness.
9/10EOZ and 8/9EFOZ Models
1 2 Fuel Solenoid Reading
Pull-In 50 Amps
Hold 1.0 Amps
3 0.12--0.26 Ohms
Black-White (P) Leads
Black-Red Leads 11-13 Ohms
4 Figure 4-5 Fuel Solenoid Readings
6 5
TP-5586-3
1. Vent screw, position 1
3. Fuel return
4. Fuel filter
5. Fuel injection pump
Figure 4-4 Fuel System Bleed Points, Typical

In addition to the ohmmeter test, check for smooth, 4.6 Fuel Pump
non-binding movement of the plunger. It is important
that the linkage between the fuel solenoid and the fuel The fuel pump transfers fuel from a source to the fuel
injection pump lever be properly adjusted to allow the injection pump.
solenoid plunger to fully compress. Improper
adjustment may cause burnout of the pull-in coil. If the Fuel Pump Test Procedure
fuel solenoid setting is suspected to be incorrect, use the
1. Remove the two leads from the terminals at the
following procedure to correct and see Figure 4-6.
bottom of the fuel pump. The pump terminals are
labeled (--) and (+). See Figure 4-7.
Fuel Solenoid Adjustment Procedure
2. Connect the inlet side of the pump to a fuel source.
1. Remove the fuel solenoid linkage. Disconnect the outlet hose from the fuel filter and
place the hose end in a container to catch the fuel.
2. With the fuel solenoid’s plunger fully compressed,
align the linkage and check injection pump lever for 3. Connect the positive (+) terminal of the 12-volt
travel. The fuel solenoid should fully compress and battery to the positive terminal of the fuel pump.
the injection pump lever should be 1.6 mm Connect the negative terminal of the fuel pump to
(0.05 in.) before the lever reaches the stop the negative (--) terminal of the battery. You should
(internal full open) position. hear the pump operate and see the fuel discharge
from the pump outlet. Replace the pump if it does
Note: The fuel solenoid must compress (bottom)
not operate.
fully or burnout of the fuel solenoid pull-in
coil will occur.
3. If the alignment is not correct, check the linkage

and mounting brackets. Loosen locknuts and
adjust the ball joint’s length in or out to attain proper
alignment. Tighten the locknut.
Run
Stop
Adjust 1/16 inch
for max.
4
1
2 3
I-940
Stop Lever 1. Fuel inlet
2 2. Negative terminal
3. Positive terminal
4. Fuel outlet
3 Figure 4-7 Fuel Pump
1. Fuel solenoid
2. Locknuts
3. Ball joints
Figure 4-6 Fuel Solenoid Linkage
16 Section 4 Fuel System TP-6053 7/04

4.7 Governor 1 2
The centrifugal, mechanical governor keeps the engine

speed constant by automatically adjusting the amount
of fuel supplied to the engine according to changes in
the load. No regular service is required on the governor.
The factory adjusts the governor during run-in, and
further adjustment should not be needed unless poor
governor control develops after extended generator
usage.
60 Hz generator sets are designed to operate at

57--63 Hz, 1800 rpm under full load and 1890 rpm under
no load.
50 Hz generator sets are designed to operate at

47--53 Hz, 1500 rpm under full load and 1590 rpm under ED-250000A-N
no load. 1. Locknut
2. Speed adjusting screw
Check the engine speed using a frequency meter
connected to the load leads. Loosen the locking nut on Figure 4-9 Governor, 8/9/10EOZ and 6.5/8/9EFOZ
the speed adjusting screw. Turn the screw clockwise to
increase the speed and frequency. Turn the screw
counterclockwise to decrease the speed. Tighten the
locknut at the new setting. See Figure 4-8 or Figure 4-9.
1 2
DK-250000B-D
1. Locknut
2. Speed adjusting screw
Figure 4-8 Governor, 5EOZ/4EFOZ

Section 5 Cooling System
5.1 General
The heat exchanger cooling system consists of a heat Checking the coolant level. Hot coolant can cause severe
exchanger with a coolant recovery tank, a thermostat, a injury or death. Allow the engine to cool. Release pressure
rubber impeller seawater pump, a centrifugal-type from the cooling system before removing the pressure cap. To
release pressure, cover the pressure cap with a thick cloth and
engine circulating pump, a water-cooled exhaust
then slowly turn the cap counterclockwise to the first stop.
manifold, and an exhaust mixer. See Figure 5-1 for
Remove the cap after pressure has been completely released
cooling system components. and the engine has cooled. Check the coolant level at the tank
if the generator set has a coolant recovery tank.
WARNING
NOTICE
Saltwater damage. Saltwater quickly deteriorates metals.
Wipe up saltwater on and around the generator set and
remove salt deposits from metal surfaces.
Hot coolant and steam.

Before removing the pressure cap,
stop the generator set and allow it to
cool. Then loosen the pressure cap
to relieve pressure.
1
2
3
5
6
12
9
Seawater
10 Coolant/Antifreeze
11
60531099
1. Engine block 7. Heat exchanger

2. Exhaust manifold 8. Engine seawater pump
3. Exhaust mixer elbow 9. Seawater strainer
4. Outlet flapper 10. Seacock
5. Silencer 11. Intake strainer
6. Thermostat 12. Engine-driven water pump
Figure 5-1 Cooling System Components
TP-6053 7/04 Section 5 Cooling System 19

5.2 Water-Cooled Exhaust glycol and 50% clean, softened water to inhibit rust and
corrosion and to prevent freezing. Add additional
Manifold coolant mixture, as necessary to the coolant recovery
Each generator set is equipped with a water-cooled tank. Periodically check the coolant level on closed
exhaust manifold. Engine coolant circulates through the systems by removing the pressure cap. Do not rely
manifold, reducing the amount of heat radiated from the solely on the level in the coolant recovery tank. Add
exhaust into the surrounding area. The engine fresh coolant mixture until the level is just below the
thermostat is located in the manifold. See Section 1 for overflow tube opening.
the thermostat location. See Figure 5-2 and Figure 5-3
Do not add coolant to a hot engine. Adding coolant to a
for exhaust manifold bolt tightening sequence and
hot engine can cause the cylinder block or cylinder head
torques.
to crack. Wait until the engine has cooled.
Note: Coolant solution. A coolant solution of 50%

ethylene glycol provides freezing protection to
3 1 5 3 1 5 --37!C (--34!F) and overheating protection to
6 2 4 6 2 4 129°C (265°F). A coolant solution with less than
50% ethylene glycol may not provide adequate
freezing and overheating protection. A coolant
solution with more than 50% ethylene glycol can
5EOZ/4EFOZ 8EOZ/6.5EFOZ cause engine or component damage. Do not use
alcohol or methanol antifreeze or mix them with
3 1 5
the specified coolant. Consult the engine
manufacturer’s operation manual for engine
coolant specifications.
6 2 4
5.5 Flush and Clean Cooling

9/10EOZ and 8/9EFOZ
5847316
System
For optimum protection, drain, flush, and refill the
Figure 5-2 Water-Cooled Exhaust Manifold Bolt cooling system at the interval listed in the operation
Tightening Sequence manual’s service schedule.
Model Bolt Torque Pay special attention to the coolant level. Check the
coolant level as described earlier.
5EOZ/4EFOZ 8 Nm (6 ft. lbs.)
8/9/10EOZ and 6.5/8/9EFOZ 19 Nm (14 ft. lbs.)
Flush and Clean Procedure
Figure 5-3 Exhaust Manifold Bolt Tightening Torques
1. Remove the pipe plug located in the heat
exchanger.
5.3 Closed Heat Exchanger
2. Open the petcocks on the engine block and cooling
In a closed cooling system, the seawater circulates system and let the system drain completely. Some
through separate chambers within the heat exchanger models may have petcocks located behind the belt
to cool the engine water. The seawater then mixes with guard.
engine exhaust and ejects out the exhaust outlet. See
Section 1.3 for the coolant capacities. Add an additional 3. Remove the pressure cap to simplify draining.
0.24 L (8.0 oz.) of coolant to the coolant recovery tank. 4. Drain, clean, and flush the cooling system,
including the coolant recovery tank, with clean
water.
5.4 Fill Check and Coolant
Keep the coolant recovery tank approximately 1/4 full. 5. Close the petcocks.
Before filling the cooling system, close all petcocks and 6. Fill the cooling system with recommended coolant.
tighten all hose clamps. Use a solution of 50% ethylene
20 Section 5 Cooling System TP-6053 7/04

5.6 Pressure Cap 9. Open the seacock.
Closed heat exchanger systems utilize a pressure cap 10. Start the generator set and check for leaks.
to raise the boiling point of the coolant, enabling higher
operating temperatures. If the cap leaks, replace it with 11. Stop the generator set and repair leaks or replace
components as necessary.
a cap having the same temperature rating.
1
5.7 Impeller Inspection and
Replacement
The belt-driven seawater pump is located on the service
side of the generator set. Check and change the
seawater pump impeller at the interval specified in the 2
service schedule. Follow the instructions included with 3
the impeller kit. If the instructions are not included with 10 4
the kit, use the following procedure. 5
6
Inspection and Replacement Procedure 9 8 7 TP-5936-28
1. Close the seacock. 1. Seawater pump 6. Housing
2. Coverplate 7. Pulley
2. Remove the seawater pump coverplate. See 3. Gasket 8. Drive shaft
Figure 5-4. 4. Impeller 9. Washer
5. Bearing 10. Nut
3. Remove the impeller.
Figure 5-4 Seawater Pump, Typical
4. Inspect the impeller for damage, including visible
cracked, broken, worn or missing fins. The 1
impeller vanes should be straight and flexible. See
2
Figure 5-5.
5. Lubricate the impeller with soapy water before

re-installation.
3
6. While installing the impeller, always rotate the drive
shaft and the impeller together in the same
direction as the engine rotation.
7. Inspect the coverplate and gasket for corrosion TP-5936-57

1. Flat spot
and/or damage. Replace damaged or worn
2. Crack
components. 3. Broken vane
8. Lubricate the gasket with silicon grease and attach Figure 5-5 Worn Impeller
the gasket and coverplate to the seawater pump
housing.

5.8 Belt Tension 7. Tighten the adjusting arm pivot screw and
alternator pivot screw.
WARNING 8. Recheck and adjust the belt tension as necessary.
9. Replace the belt guard.
10. Reconnect the generator set engine starting

battery, negative (--) lead last.
Rotating parts.
Belt Type Deflection mm (in.) Force (kgf) N
New (7--9) 0.3--0.4 (10) 98
all guards, screens, and covers are in
place. Used (10--15) 0.4--0.6 (10) 98
Figure 5-6 Belt Specifications

Servicing the generator set when it is operating. Exposed
moving parts can cause severe injury or death. Keep
hands, feet, hair, clothing, and test leads away from the belts
3
and pulleys when the generator set is running. Replace
guards, screens, and covers before operating the generator
set.
Check the belt tensions at the interval specified in the

service schedule. If the tensions are not within 1 2
specifications, adjust as necessary using the following 4
procedure.
10
Belt Tensioning Procedure 5
9

6
8 7 TP-5586-3
3. Remove the belt guard.
4. Check the belt tension at the midpoint of the 1. Adjusting arm pivot screw
2. Battery charging alternator pulley
longest span of the belt by pressing the belt with
3. Adjusting screw
your finger and measuring the resulting deflection. 4. Alternator pivot screw
See Figure 5-6 and Figure 5-7. If the belt is not 5. Check alternator belt tension here
within specifications, go to step 5. If the belt is 6. Crankshaft pulley
7. Check seawater pump belt tension here
within specifications, go to step 9.
8. Adjusting screw
9. Seawater pump pulley
5. Loosen the adjusting arm pivot screw, alternator 10. Pivot screw
pivot screw, and alternator adjusting screw.
Figure 5-7 Belt Tension, Typical
6. While prying the alternator outward, tighten the
alternator screw.

5.9 Siphon Break 3. Use a light detergent to clean the reed valve.
A siphon break prevents seawater entry into the engine 4. Check that the reed valve opening is clear.
when the engine exhaust manifold outlet is less than
23 cm (9 in.) above waterline. Check the siphon break 5. Replace the siphon break if it is cracked or if the
reed valve material has hardened or deteriorated.
at the interval listed in the service schedule. Use the
following procedure and Figure 5-8 to ensure correct 6. Install the reed valve downward into the mounting
functioning of the siphon break. base.
Siphon Break Inspection Procedure 7. Install the retaining cap and finger-tighten only. Do
not overtighten.
Note: Consult the installation manual for a complete
2. Remove the retaining cap and the reed valve for explanation of the dimensions and other
inspection. See Figure 5-8. installation considerations.
2
3
7 8
1
9
10
21
6
19 4
Waterline
20
15 11
18
14
16
12
17
13
TP-5586-3
1. Mounting holes 11. Seawater strainer
2. Retaining cap 12. Seacock
3. Reed valve assembly 13. Intake strainer
4. Silencer vertical lift 1.2 m (4 ft.) max. 14. Engine-driven seawater pump
5. Exhaust mixer elbow distance above waterline. If less than 15. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
23 cm (9 in.), a siphon break is required. 16. Water lock (optional)
6. Siphon break distance above waterline 30.5 cm (1 ft.) min. 17. Silencer distance from exhaust mixer elbow 3 m (10 ft.) max.
7. Siphon break 18. Silencer (customer-supplied)
8. Exhaust mixer elbow 19. Exhaust hose pitch 1.3 cm per 30.5 cm (0.5 in. per ft.) min.
9. Heat exchanger (locations vary by model) 20. Exhaust outlet distance above waterline 10 cm (4 in.) min.
10. Coolant recovery tank (locations vary by model) 21. Seawater outlet
Figure 5-8 Siphon Break, Plastic “U” Type

5.10 Anticorrosion Zinc Anode Anticorrosion Zinc Anode Replacement Procedure
The heat exchanger contains an anticorrosion zinc 1. With the generator set cooled, close the seacock,
anode (plug) to prevent electrolytic corrosion of remove the zinc plug from the heat exchanger, and
generator components by seawater. drain the coolant into a container.
2. Remove the corrosion on the zinc anode. Replace

Check and replace the zinc anode at intervals
the anode when the percent of the zinc remaining is
recommended by the operation manual’s service
less than 50% of the length and diameter shown in
schedule.
Figure 5-10.
3. Clean the threaded opening of the heat exchanger

and coat the threads of the zinc anode with pipe
sealant.
4. Install the zinc anode into the heat exchanger.
5. Open the seacock.
6. Refill the cooling system.
7. Start the generator set and check for leaks at the

zinc anode’s location. The pump is operating if
1
2 cooling water flows from the exhaust outlet. If water
5EOZ/4EFOZ is not discharging at the exhaust outlet stop the
3 generator set. For seawater pump priming see the
Prestart Checklist in the operation manual.
2
1 TP-5586-3
2 1. Diameter: 9 mm (0.34 in.)
2. Length: 43 mm (1.7 in.)
3
8EOZ/6.5EFOZ Figure 5-10 Anticorrosion Zinc Anode (Plug)
1
2
3
9/10EOZ and 8/9EFOZ GA-250000C-G
1. Anticorrosion zinc anode (seawater drain)

2. Heat exchanger
3. Coolant drain
Figure 5-9 Anticorrosion Zinc Anode

Section 6 Controller Troubleshooting
6.1 General shutdown modes. Use this as a starting point for

controller fault identification. Use the LEDs on the
The following section covers the controller controller circuit board to assist in the troubleshooting
troubleshooting procedure for generator sets equipped process. An illuminated LED indicates that the
with the relay controller and related engine components. respective relay is receiving power; the LED does not
Refer to Figure 6-1 to identify the controller indicate whether that relay is energized. Additional
components. relay test procedures are covered later in this section.
Refer to the wiring diagrams in Section 10, Voltage
1 Reconnection and Wiring Diagrams, to assist in the
troubleshooting procedure.
6.2.1 Start
Close the start/stop switch between N (ground) and 47
(local or remote starting).
The K2 relay energizes. The normally open K2 contacts

7 close to energize the K3 relay (LED3 lights), the K25
(fuel solenoid) relay, the controller hourmeter, and the
generator armature exciter field.
The K25 relay normally open contacts close to energize

the fuel solenoid.
The K3 relay normally open contacts close to energize

the K20 (starter) relay. The K20 relay normally open
5 4 contacts close to energize the S relay (starter solenoid).
6 3 2
The S relay normally open contacts close to energize
6 4 2 the starter motor.
6.2.2 Run
The B1 and B2 windings of the stator supply AC voltage
to the bridged rectifier (BR1), the K1 relay energizes
(LED1 lights). After a 5--10 second time delay, the K5
relay energizes (LED5 lights).
A-229301-N Note: Voltage to the K1 and K5 relays is rectified and

1. Voltage regulator 5. K20 relay regulated at 12 volts DC by the bridge rectifier
2. DC circuit breaker 6. START/STOP switch (BR1) and the voltage regulator (VR1).
3. K25 relay 7. Controller circuit board
4. Hourmeter
Stator winding 33--34 provides a voltage sensing source
Figure 6-1 Controller Internal Components to the voltage regulator (PBIIIE).
The normally open K1 contacts close to maintain

6.2 Controller Sequence of voltage to the K2 relay (LED2 remains lit).
Operation The normally open K2 contacts remain closed to
The following text covers the controller’s sequence of maintain voltage to the fuel solenoid and the controller
operation during generator start, run, stop, and fault hourmeter.
TP-6053 7/04 Section 6 Controller Troubleshooting 25

The normally open K1 contacts close to energize the 6.3 Engine Safety Shutdown
(optional) oil pressure, coolant temperature, battery
voltmeter, and hourmeter gauges and the generator ON
Switches
light.
6.3.1 Low Oil Pressure (LOP) Shutdown
The normally open K5 contacts close to permit the high
water temperature (HWT), high exhaust temperature When low oil pressure occurs, the LOP shutdown switch
(HET), and low oil pressure (LOP) switches to function. contacts close and energize the K4 relay (LED4 lights).
Note: The low oil pressure (LOP) switch contacts open Note: During cranking the low oil pressure shutdown
when the engine develops oil pressure. switch is deactivated until the K5 relay energizes.
This delay allows the engine to reach normal
One set of normally closed K1 contacts opens to operating oil pressure. The normally closed LOP
disconnect the circuit to the positive (+) connection of contacts open when the generator set develops
the exciter fields (field flashing). adequate oil pressure.
A set of normally closed K1 contacts opens to The normally closed K4 contacts open to deenergize the
disconnect the circuit to the negative (--) connection of K25 relay. The K25 normally open contacts open to
the exciter field (field flashing). The normally closed K1 deenergize the fuel solenoid.
contacts open to deenergize the K3 relay (LED3 goes
out) and prevent accidental reenergizing of the starter The normally open K4 contacts close to maintain ground
motor. The K3 contacts open to deenergize the K20 to the K4 relay.
relay. The K20 contacts open to deenergize the S relay.
As the generator set shuts down, the K1 relay
The S contacts open to deenergize the starter motor.
deenergizes (LED1 goes out). The normally open K1
When the generator set is running, the start switch contacts open to deenergize the K2 relay (LED2 goes
contacts N and 47 open by releasing the start/stop out). The normally closed K2 contacts close to ground
rocker switch. the circuit to the K4 relay until the generator set comes to
a complete stop.
6.2.3 Stop
6.3.2 High Water Temperature (HWT)
Close the start/stop switch between N and 43 (local or and High Exhaust Temperature
remote). (HET) Shutdown Switch
The K4 relay energizes (LED4 lights). When a high temperature is encountered at one (or
both) of these sources, the shutdown switch contacts
The normally closed K4 contacts open to deenergize the close and energize the K4 relay (LED4 lights).
K25 relay. The K25 normally open contacts open to
deenergize the fuel solenoid. The normally closed K4 contacts open to deenergize the
K25 relay. The K25 normally open contacts open to
The normally open K4 contacts close to maintain ground deenergize the fuel solenoid.
to the K4 relay.
The normally open K4 contacts close to maintain ground
As the generator set shuts down, the K1 relay to the K4 relay.
deenergizes (LED 1 goes out). The normally open K1
contacts open to deenergize the K2 relay (LED 2 goes As the generator set shuts down, the K1 relay
out). The normally closed K2 contacts close to ground deenergizes (LED1 goes out). The normally open K1
the circuit to the K4 relay until the generator set comes to contacts open to deenergize the K2 relay (LED2 goes
a complete stop. out). The normally closed K2 contacts close to ground
the circuit to the K4 relay until the generator set comes to
a complete stop.
26 Section 6 Controller Troubleshooting TP-6053 7/04

Component Ohmmeter Connections Procedure Results
K1 Relay Coil K1 coil terminals Ohmmeter on R x 10 If functional, approximately 270 ohms.
(see relay schematic) scale Low resistance (continuity), shorted coil.
High resistance, open coil.
Figure 6-2 Relay Testing
6.4 Controller Circuit Board

Some controller circuit board components can be tested 1 2 3 4
without removing the component from the circuit board.
Perform these checks prior to installing a new circuit
board and attempting startup. Use a high-quality
5
multimeter and follow the manufacturer’s instructions.
To obtain accurate readings when testing, remove all
the circuit board connectors and conformal coating
13
(transparent insulation) from component terminals. Use
the chart in Figure 6-2 and the controller circuit board
illustration in Figure 6-3.
The controller circuit board has light-emitting diodes

(LEDs) which indicate relay coil power and aid in the
circuit board and the generator fault detection. When
the K1, K2, K3, K4, or K5 relays receive power the
corresponding LED lights. The LED does not indicate 10 9 8 7 6
12
whether the relay coil is energized. Determine if the
relay coil is energized by analyzing the generator faults
when performing a continuity test on the relay coil.
11
H-239563
1. Engine crank control relay (K3)
2. P1 connector
3. P2 connector
4. Time delay relay (K5)
5. LED5
6. LED2
7. Engine run relay (K2)
8. AC crank disconnect relay (K1)
9. LED1
10. Fault shutdown relay (K4)
11. Relay schematic
12. LED4
13. LED3
Figure 6-3 Controller Circuit Board

6.5 Troubleshooting
Use the following flow chart as an aid in troubleshooting prescribed remedy does not correct the problem, the
the main circuit board and the entire generator set. If the circuit board may have to be replaced.
Press the start switch Does the engine crank? Go to A

Yes
(local or remote). (next page).
No
No Is the K2 relay LED lit? Yes
No Is the K3 relay LED lit? Yes
Is voltage present at
the K20 relay coil?
Is the 10-amp controller Is the K2 relay
circuit breaker okay? functioning correctly? No Yes
Is the K3 relay
functioning correctly?
No Yes No Yes
No Yes
Replace The K3 relay or

the circuit K1 relay is faulty. Replace
Check the P1--4
Reset the board. Replace the the circuit
connection.
circuit breaker. circuit board. board.
# Check the condition/

connections of the No Is voltage present Yes
start/stop switch at the S relay coil?
(N, 43, and 47).
# Check the battery
condition and
connections. Is the K20 relay Is voltage present at
# Check the connections No functioning Yes the S relay contact
at P1--14. correctly? (starter motor side)?
# Do all check okay?
Replace the Check P4--22

K20 relay. Connection. No Yes
Yes
Replace
Replace the circuit Replace the S relay. the starter
board (D9 open).
motor.
Figure 6-4 Troubleshooting Relay Controller Circuit Board (1 of 4)

A Yes Go to B
Does the engine start?
(next page).
No
Is 12 volts DC
No present at the
Yes
fuel solenoid?
(check wiring)?
Is the 10-amp fuse okay? No
Yes Is the K4 relay LED lit? No

Yes Replace
the fuse.
Do the local and remote Engine fault: check the fuel

Is the K25 relay functioning start/stop switches Yes supply, fuel feed pump, fuel
correctly? function correctly? injection pump, etc.
No Yes No Replace the circuit board

(inoperative K4 relay).
Replace Replace the inoperative

the K25 start/stop switch.
relay.
# Check the P1--8 connection.

# Check the P4--14 connection.
# Replace the circuit board
(the K2 relay is inoperative).

Does the engine continue Can the engine be stopped
B to run after the start Yes Yes
by using the stop switch?
switch is released?
No Generator set
No checks out okay.
Did the K4 relay LED light? Yes

No Does the K1
relay LED light?
No Is the fuel solenoid

No
Yes functioning
correctly?
Go to C Do the local and

(next page). remote start/ stop
switches function No
correctly? Replace
the fuel
Does the K5 relay LED solenoid.
Yes
light after 5--10 seconds No
of running time?
Replace the
Yes inoperative
Replace the circuit
Yes start/stop
board (the K5 relay
switch.
is inoperative).
Replace the
Did the K4 relay LED light? No circuit board Is the K25 relay functioning
(the K4 relay is No
correctly?
inoperative).
Do the local and

remote start/stop Yes Replace
Yes switches function No the K25
correctly? relay.
Yes Replace the circuit Replace the inoperative Replace the circuit board
board (inoperative start/stop switch. (inoperative K4 relay).
K1 or K2 relay).
Does the low oil pressure

(LOP) safety shutdown No Replace the LOP safety
switch check out okay? shutdown switch.
Yes
Do the temperature Replace the
Yes safety shutdown Yes circuit board
switches check out (inoperative K4
Does the engine have proper oil okay? relay).
pressure? Use a mechanical
gauge to verify pressure.
Replace the inoperative
Check the oil level. No temperature switch(es).
No Repair/ replace oil pump.

Is there AC output
when the start button Is AC output at the Is the voltage
C is HELD and the unit Yes correct voltage No regulator No
is running? (e.g. 120 volts AC)? fuse okay?
No
Replace the
Yes fuse.
Is there 12VDC at
Yes
the exciter field?
Yes
Test the
voltage
No Test the stator, regulator.
and the main
field.
Replace the
controller
circuit Test the stator,
Is there 12VAC output at the main field (rotor) and
board. No
B1/B2 stator winding? exciter/armature.
Go to B at the beginning Yes

of the preceding page.
Replace the
controller circuit
board.
(OPTIONAL)
Separately excite the

generator set to
determine if other
components are
inoperative.
Is AC output voltage at Test the stator, main

spec.? (See Section 7.3, No field (rotor), and
Separate Excitation). exciter/armature.
Yes
Test the
voltage
regulator.

Section 7 Generator Troubleshooting
7.1 General 7.2 General Troubleshooting

Before beginning the following troubleshooting To determine the cause of no- or low-AC output , refer to
procedures, read all the safety precautions at the the following steps and the troubleshooting flow chart
beginning of this manual. The following tests include (Figure 7-1).
additional safety precautions; OBSERVE THESE
PRECAUTIONS! General Troubleshooting Procedure
1. Check the condition of the voltage regulator’s
WARNING
8-amp fuse.
2. If the fuse is functional, separately excite the

generator. (See Section 7.3.) The separate
excitation test duplicates the role of the voltage
Hazardous voltage. Moving rotor. regulator by providing excitation current to the
Can cause severe injury or death. rotor.
all guards and electrical enclosures
are in place. Generator has no
output
Testing the voltage regulator. Hazardous voltage can
cause severe injury or death. High voltage is present at the
voltage regulator heat sink. To prevent electrical shock do not
touch the voltage regulator heat sink when testing the voltage Separately Generator has
regulator. excite generator output
(PowerBoost", PowerBoost" III, and PowerBoost" V
voltage regulator models only)
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible Generator has Test voltage
whenever electricity is present. Open the main circuit no output regulator and wiring
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never Test the exciter circuit
contact electrical leads or appliances when standing in water and rectifier module
or on wet ground because these conditions increase the risk of
electrocution.
High voltage test. Hazardous voltage can cause severe
injury or death. Follow the instructions of the test equipment
Test rotor Test stator
manufacturer when performing high-voltage tests on the rotor
or stator. An improper test procedure can damage equipment
or lead to generator set failure. TP-598651
Short circuits. Hazardous voltage/current can cause Figure 7-1 General Troubleshooting
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
TP-6053 7/04 Section 7 Generator Troubleshooting 33

7.3 Separate Excitation 5. Start the engine and check that the ammeter
remains stable. An increasing meter reading
By separately exciting the generator to determine the indicates a shorted rotor. A decreasing meter
presence of a faulty voltage regulator, it is possible to reading to zero or unstable reading, suggests a
determine if a running fault exists in the rotor and/or running open in the rotor. If the ammeter is stable,
stator. A generator component that appears functional continue with step 6.
while static (stationary) may exhibit a running open or
short circuit while dynamic (moving). Centrifugal forces 6. Check for AC output across the stator leads and
acting on the windings during rotation or insulation compare the measured output to the values in
Section 1, Specifications. If the output varies
breakdown as temperatures increase can cause short
considerably from those listed, a faulty stator, rotor,
circuits.
rectifier module, or armature is the likely cause.
Separate Excitation Procedure Note: See Section 1, Specifications, for the stator
output voltages (with separately excited
1. Disconnect all the leads from the voltage regulator. generator). These specifications are based on a
battery of 12 volts. Should the battery voltage
2. Disconnect the P10 (F1, F2) connector.
vary, the resulting stator output values will also
3. Connect a separate excitation circuit as shown in vary.
Figure 7-2. Connect an ammeter and a 10-amp
If there is no generator output during normal operation
fuse in series with F1. Note and record the
ammeter reading. but output is available when the generator set is
separately excited, the voltage regulator is probably
4. The approximate ammeter reading should equal inoperative.
battery voltage divided by the specified exciter
resistances (cold). Disconnect the resistor leads
and determine the resistance value using an 7.4 PowerBoost IIIE Voltage
ohmmeter. See Section 1, Specifications, for the Regulators
correct values.
The generator set is equipped with a PowerBoost" IIIE
Example: voltage regulator. See Figure 7-3.
12 Volts (Battery Voltage) 3.4-amp
= The voltage regulator monitors the output voltage to the
3.5 Ohms Exciter Resistance Exciter Current
generator exciter field.
+ — 1 3 If the regulator’s 8-amp fuse blows, the generator set will

2 shut down. Verify that the regulator fuse is functional
before proceeding with the test.
9 P6
8
F1 F2
7
— +
5
6
4
605372
1. Voltage regulator
2. 10-amp fuse
3. DC ammeter
4. Battery TP-598653
5. Ground to generator frame
6. Exciter armature Figure 7-3 PowerBoost"IIIE Voltage Regulator
7. Exciter field
8. 10- or 15-ohm resistor
9. P6 connector (disconnect P6 connector before separate
excitation)
Figure 7-2 Separate Excitation Connections
34 Section 7 Generator Troubleshooting TP-6053 7/04

7.4.1 Voltage Regulator Test
4
When the frequency drops below 57.5/47.5 Hz, the AC 1 2 3
voltage should decline. Perform the following test to
check the regulator output. 5
66 4433 55 -- +
Use the following components to test the voltage GY R Y O W BK
regulator: 6
7
! Variable transformer, 0--140 volts, 0.5-amp minimum
! Plug, 120 volts AC
! Lamp, 120 volt, 100 watt
TP-598654
! AC voltmeter
1. 120 volts AC
! Insulated copper wire, #14 AWG, minimum 2. Variable transformer
3. AC voltmeter
4. Voltage regulator PowerBoost!IIIE
Regulator Test Procedure 5. Stator/rotor connections (for reference only)
6. Lead color
1. Connect the components as shown in Figure 7-4. 7. 120 volt, 100 watt lamp
2. Turn the variable transformer setting to zero. Plug Figure 7-4 PowerBoost"IIIE Voltage Regulator Test
in the variable transformer.
3. Turn the variable transformer on. Slowly increase 7.4.2 Voltage Regulator Adjustment
the variable transformer voltage to 100 volts. The Kohler Co. sets the voltage regulator and, under normal
test lamp should light. If the lamp does not light, circumstances, the regulator requires no further
turn the voltage adjustment potentiometer (pot)
adjustment. However, if the voltage regulator has been
clockwise. If the lamp still does not light, the
replaced or tampered with, or if voltage/frequency
voltage regulator is inoperative. Replace the
reconnection has been done, readjust the voltage
voltage regulator. An inoperative voltage regulator
regulator according to the following procedure. The
causes a generator no/low-output condition.
following paragraphs describe the voltage regulator
4. Slowly increase the voltage to 120 volts. The lamp components.
should go out and stay out as the voltage
increases. If the lamp remains lit, turn the voltage Voltage Adjustment Pot adjusts the generator output
adjustment pot counterclockwise. If the lamp still within the range of 100--130 volts.
remains lit, replace the voltage regulator. An
inoperative voltage regulator causes a generator Stabilizer Pot fine-tunes regulator circuitry to reduce
high voltage output condition. light flicker.
5. Turn the variable transformer to zero and unplug Volts/Hz Pot adjustment determines the engine speed
the AC cord. (Hz) at which the generator output voltage begins to
drop.
Note: For applications requiring fine voltage
adjustment, connect a remote rheostat to Note: The volts/Hz adjustment does not apply to the
voltage regulator terminal 66. following models: 4/6.5/8/9EFOZ and
5/8/9/10EOZ. On these models, turn the volts/Hz
adjustment pot full counterclockwise to stop and
seal. No further volts/Hz adjustments are
required.

Voltage Regulator Adjustment Procedure 8. Use the remote rheostat, if equipped, to make final
voltage adjustments.
2. Turn the remote rheostat, if equipped, to the
midpoint. Turn the voltage and stability pots fully
counterclockwise. Connect the voltmeter to the AC 7.5 Exciter Field
circuit or an electrical outlet.
DC current from the battery magnetizes the exciter field.
3. Start the generator set. When the exciter armature rotates within the
magnetized exciter field windings, an electrical current
4. Adjust the engine speed to 1800 rpm on 60 Hz units develops within the exciter armature. There will be low
and 1500 rpm on 50 Hz units. or no generator output if the exciter field is inoperative.
5. Rotate the voltage adjustment pot clockwise to Test the exciter field according to the following
increase the voltage or counterclockwise to procedure.
decrease the voltage to achieve the desired output
voltage. Exciter Field Test Procedure
6. Rotate the stability pot clockwise until the light 1. Place the start/stop switch in the STOP position.
flickers minimally.
7. Readjust the voltage adjustment pot to achieve battery, negative (--) lead first.
the desired output voltage.
3. Disconnect the P6 and P7 connectors.
2
1 4. Check the exciter field resistance by connecting an
17 3 ohmmeter across exciter field FP and FN leads.
See Section 1, Specifications, for the resistance
66
33
4 reading of a cold exciter field. A low reading
66 44 33 55 -- + indicates an internal short and a high reading
GY R Y O W BK indicates an open winding. Repair or replace the
3 4
5
16 exciter field if the ohmmeter readings indicate a
33 44 6 inoperative exciter field. If the resistance test
15 7 8 proves inconclusive, perform a megohmmeter test
B1
55 on the exciter field as described in the next step.
13 14 10
B2
11
1
2 1
12
9
605375
1. Voltage adjustment potentiometer
2. Stabilizer potentiometer
P7
3. Volt/Hz potentiometer
4. Exciter connections (for reference only) FP FN 2
5. Lead color
6. DC output
7. Exciter
8. Rotor
9. Armature
3
10. 8-amp fuse 558857
11. AC power input (aux.) 1. Ohmmeter
12. Main (2 and 1) 2. Exciter field
13. Control 3. Exciter armature
14. Stator
15. Sensing Figure 7-6 Exciter Field Resistance Check
16. Main (3 and 4)
17. Remote rheostat (optional)
Figure 7-5 PowerBoost"IIIE Voltage Regulator

Adjustment

5. Check the exciter field for a grounded condition.
Use a megohmmeter to apply 500 volts DC to the
FP or FN lead and the exciter field frame. Follow 6 1
the instructions of the megohmmeter manufacturer
when performing this test. A reading of AC F+
AC
approximately 500 kOhms (1/2 megohm) and AC F--
higher indicates the field winding is functional. A
reading of less than approximately 500 kOhms 5
3 2
indicates deterioration of the winding insulation
and possible current flow to ground. Repair or
replace the exciter field.
4
1
558878
1. Main field (rotor)

2. Stator windings
3. Rectifier module
4 P7 4. Ohmmeter
5. Armature
FP FN
6. Exciter field
2
Figure 7-8 Exciter Armature Ohmmeter Test
3
5. Check if the exciter armature winding is ground.
558858
Use a megohmmeter to apply 500 volts DC to
1. Ohmmeter
either armature lead and the armature frame.
2. Frame connection Follow the instructions of the megohmmeter’s
3. Exciter armature manufacturer when performing this test. See
4. Exciter field Figure 7-9. A reading of approximately 500 kOhms
Figure 7-7 Megohmmeter Connections on the (1/2 megohm) and higher indicates that the exciter
Exciter Field armature is functional. A reading of less than
approximately 500 kOhms indicates deterioration
of the winding insulation and possible current flow
7.6 Exciter Armature to ground. Repair or replace the exciter armature.
The exciter armature supplies excitation current to the

7 1
generator main field through the rectifier module. There
will be low or no generator output if the exciter armature AC F+
AC
is inoperative. Test the exciter armature as described in AC F--
the following steps. Disassemble the generator set prior
6
to performing this test. 3
2
Exciter Armature Test Procedure

4
1. Disassemble the alternator.
2. Disconnect the armature leads from the rectifier 5

module AC terminals.
558879
3. With an ohmmeter on the R x 1 scale, check the 1. Main field rotor

resistance across the exciter armature leads. See 2. Stator windings
3. Rectifier module
Figure 7-8. The armature resistance should be
4. Ohmmeter
0.6--0.8 ohms (continuity). No continuity indicates 5. Shaft connection
an open armature winding. Replace the armature. 6. Armature
7. Exciter field
4. Perform a megohmmeter test on the exciter
Figure 7-9 Megohmmeter Connections on Exciter
armature as described in the next step. Consider
Armature
the exciter armature good if the resistance reading
(continuity) is low and there is no evidence of a
shorted winding (heat discoloration).
7.7 Rectifier Module 7.8 Rotor
The rectifier module, located between the exciter The generator rotor (magnetized by DC current from the
armature and the main field, converts the AC from the rectifier module) rotating within the stator windings
exciter armature to DC which magnetizes the generator induces AC voltage in the stator windings. Test the
main field. Test the rectifier module as described in the generator rotor (main field) as described in the following
following steps. steps.
Rectifier Module Test Procedure Rotor Test Procedure

1. Disconnect the exciter armature and the main field 1. Disassemble the generator.
leads from the rectifier module.
2. Disconnect the generator main field windings from
2. Use an ohmmeter on the R x 100 scale to check the rectifier module terminals F+ and F--.
resistance between the rectifier diodes as shown in
Figure 7-10. The ohmmeter should show 3. Check the main field resistance by connecting an
resistance in one direction and, upon reversing the ohmmeter across the main field F+ and F-- leads.
ohmmeter leads, a high resistance in the other See Figure 7-11. The resistance reading for a cold
direction. Replace the rectifier module if any of the main field should be approximately 2.5--4.5 ohms.
diodes tests differently than described. A low reading indicates an internal short and a high
reading indicates an open winding. Replace the
main field if the ohmmeter readings indicate that
the main field is inoperative.
A
B 4. Perform a megohmmeter test on the main field as
described in the next step.
+ --
1 6
1
AC F+
AC
C AC F--
5 3
(AC) 2
(AC)
4
A B
B1
A1 C1 -- + 5588711
1. Main field (rotor) 4. Ohmmeter

(AC) 2. Stator windings 5. Armature
C 5588710 3. Rectifier module 6. Exciter field
1. Diode terminal
Figure 7-11 Ohmmeter Connections on
Figure 7-10 Testing Rectifier Module Main Field

5. Check the main field for a grounded condition by Stator Test Procedure
using a megohmmeter. Apply 500 volts DC to
either field lead and the main field frame. Follow 1. Check the generator output lead connections. See
the instructions of the megohmmeter’s Section 10, Voltage Reconnection and Wiring
manufacturer when performing this test. See Diagrams.
Figure 7-12. A reading of approximately
2. Disconnect all the stator leads to isolate the
500 kOhms (1/2 megohm) and higher indicates the
windings. To check the stator continuity, set the
main field is good. A reading of less than
ohmmeter on the R x 1 scale. Contact the red and
approximately 500 kOhms indicates the
black ohmmeter leads; adjust the ohmmeter to
deterioration of the winding insulation and possible
zero ohms. Check the stator continuity by
current flow to ground. Repair or replace the main
connecting the meter leads to the stator leads as
field.
shown in Figure 7-13. Perform the stator tests on
all the stator windings. See Figure 7-14.
7
1 3. Contact the ohmmeter leads and readjust the
AC F+ ohmmeter to zero ohms. Check the cold
AC
AC F-- resistance of the stator windings by connecting the
6
meter leads to the stator leads 1 and 2, 3 and 4,
3 B1 and B2, etc. See Section 1, Specifications, for
2
the stator resistance values. Replace the stator if
readings do not fall within the specified value.
Note: The stator resistance will vary directly with

5
4 increased temperature.
33 3 4
5588712 55 44
F1 F2
1. Main field (rotor) 5. Megohmmeter
2. Stator windings 6. Armature 6
3. Rectifier module 7. Exciter field
1
4. Shaft connection AC F+
AC
AC F--
Figure 7-12 Megohmmeter Connections on Main
Field 5 3
B1 B2 1 2
2
7.9 Stator
4
The stator consists of a series of coils of wire laid in a
laminated steel frame. The stator leads supply voltage
to the AC load and exciter regulator. 5588713
1. Main field (rotor) 4. Ohmmeter
Leads 1, 2, 3, and 4 are the generator output leads. 2. Stator windings 5. Armature
3. Rectifier module 6. Exciter field
Leads 33, 44, and 55 are the voltage regulator supply
and sensing leads. The output of leads B1 and B2 are Figure 7-13 Stator Ohmmeter Connections
rectified by BR1 to supply the control voltage. BR1 is
located on the controller circuit board. Between Leads Continuity
1 and 2 Yes
Prior to testing, inspect the stator for heat discoloration 3 and 4 Yes
and visible damage to the housing lead wires or 33 and 44 Yes
exposed and varnished areas of the frame laminations. 33 and 55 Yes
Be sure the stator is securely fastened in the stator B1 and B2 Yes
1 and 3, 4, 33, 44, 55 No
housing. 1 and 55, B1, and B2 No
4 and B1 and B2 No
The stator produces electrical output (AC) as the 55 and B1 and B2 No
magnetized main field rotates within the stator windings. Any stator lead and ground No
Test the condition of the stator according to the following Figure 7-14 Stator Continuity
procedure. Refer to the schematic in Figure 7-13 when
performing the following tests.

4. Perform a megohmmeter test on the stator as
33 3 4
described in the next step. Consider the stator F1 F2
55 44
good if the resistance reading (continuity) is low
and there is no evidence of shorted windings (heat 7
1
discoloration). AC F+
AC
AC F--
Note: When taking an ohmmeter reading using
lead 55, make the connection prior to the 6 3
in-line fuse. B1 B2 1 2
2
5. Check the stator for a short to ground using a
megohmmeter. Apply 500 volts DC to any stator 4
lead from each winding and the stator frame.
Follow the instructions of the megohmmeter
manufacturer when performing this test. Repeat 5
the test on the other leads until all the stator
windings have been tested. A reading of 5588715
approximately 500 kOhms (1/2 megohm) and 1. Main field (rotor) 5. Megohmmeter
2. Stator windings 6. Armature
higher indicates the stator is good. A reading of 3. Rectifier module 7. Exciter field
less than approximately 500 kOhms indicates 4. Shaft connection
deterioration of the winding insulation and possible
current flow to ground. Repair or replace the stator. Figure 7-15 Megohmmeter Connections on Stator

Section 8 Component Troubleshooting
8.1 General
See Figure 8-1 through Figure 8-3 for component Short circuits. Hazardous voltage/current can cause
testing. With the generator set battery connected, severe injury or death. Short circuits can cause bodily injury
check the generator wiring harness and the and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
components listed in the following tables. Check each
repairs. Remove all jewelry before servicing the equipment.
component using a multimeter to verify that the switches
function and that voltage is present at each component.
WARNING
Hazardous voltage. Moving rotor.

all guards and electrical enclosures
are in place.
Component Voltmeter Connections Procedure Results

Hourmeter and wiring Connect the red test lead to Set the voltmeter to 12 volts A 12 volt DC reading
the hourmeter positive (+) DC or greater. Start the indicates the wiring harness
terminal. Connect the black generator set. is functional.
test lead to the hourmeter
negative (--) terminal.
None (see Procedure). Disconnect the hourmeter If functional, hourmeter
leads and apply 12 volts DC operates.
to the hourmeter. The
hourmeter is polarity
sensitive.
Stator auxiliary winding B1 Connect the AC voltmeter Stop the generator set. A reading of 12--15 volts AC
and B2 leads to the B1 and B2 Connect a voltmeter to the indicates a functional B1/B2
windings at connector P11. B1 and B2 windings. Crank winding.
the generator set and allow
the set to reach rated its
speed.
Figure 8-1 Engine/Generator Component Testing, Relay Controller
TP-6053 7/04 Section 8 Component Troubleshooting 41

To further check the generator set components, Note: Before performing ohmmeter checks, disconnect
disconnect the battery and remove the wiring harness the generator set battery to prevent damage to
plugs from the controller circuit board. Use an the ohmmeter.
ohmmeter to check the continuity of the components
and to isolate inoperative components. Refer to
Figure 8-2 and Figure 8-3.

Start/stop switch Connect the ohmmeter to the Place the ohmmeter on the If the switch is functional, zero
P2-6 and P2-4 leads. R x 1000 scale. Place the ohms continuity. Any
rocker switch in the START resistance other than zero or
position. very low ohms, replace the
switch.
Connect the ohmmeter to the Place the ohmmeter on the If the switch is functional, zero
P2-6 and P2-5 leads. R x 1000 scale. Place the ohms continuity. Any
rocker switch in the STOP resistance other than zero or
position. very low ohms, replace the
switch.
K20 relay coil and wiring Connect the ohmmeter to the Place the ohmmeter on the If functional, 85 ohms. Low
P1-4 and P1-9 leads. R x 1 scale. resistance, shorted C relay
coil and/or wiring. High
resistance, open C relay
and/or wiring. Replace the
controller board.
Starter solenoid Connect the ohmmeter to the Place the ohmmeter on the If functional, approximately
(S relay) P4-22 lead and the battery R x 1 scale. 0.5--0.6 ohms at 27°C (80°F).
positive (+) cable. Note: The
J4 and P4 leads must be
disconnected to perform this
test.
Controller 10-amp Connect the ohmmeter to the Place the ohmmeter on the If functional, zero or very low
circuit breaker and battery positive (+) cable and R x 1000 scale. ohms. No reading (infinity),
wiring the P1-14 lead. Note: The J4 open circuit or circuit breaker
and P4 leads must be tripped.
connected to perform this test.
42 Section 8 Component Troubleshooting TP-6053 7/04

Main field (rotor) Disconnect the P10 and P11 Place the ohmmeter on the If the resistance readings
connectors and connect the R x 1 scale. match those specified in
ohmmeter to P10-1 and P10-2 Section 1, Specifications, the
leads. rotor is functional. Low
resistance, rotor windings
shorted. High resistance,
rotor windings open.
B1/B2 stator windings Connect the ohmmeter to the Place the ohmmeter on the If the resistance readings
P11-1 and P11-2 leads. R x 1 scale. match those specified in
Note: Disconnect P11 and J11 Section 1, Specifications, the
to perform this test. B1/B2 windings are
functional. Low resistance,
B1/B2 windings shorted. High
resistance, B1/B2 windings
open.
P1 ground connection Connect the ohmmeter to the Place the ohmmeter on the If functional, zero ohms
P1-9 and ground. R x 1 scale. (continuity). Any other
reading indicates a poor
ground connection.
High exhaust Connect the ohmmeter to the Place the ohmmeter on the If functional, open circuit. Any
temperature (HET), low P1-15 and engine block R x 1000 scale. continuity suggests an
coolant (LCS) safety (ground). Note: Remove and inoperative temperature
shutdown switches isolate the LOP switch lead. switch(es). Replace the
switch(es).
Low oil pressure (LOP) Connect the ohmmeter to the Place the ohmmeter on the If functional, zero ohms
safety shutdown switch P13-1 and engine block R x 1000 scale. This test is (continuity). Then, disconnect
(ground). not conclusive until the the LOP switch lead and
temperature shutdown isolate the terminal. Meter
switches are checked. reading should show an open
circuit.
8.2 Remote Panels (Optional) Troubleshooting Remote Start Panels
Kohler Co. offers three remote panels for connection to Generally, if the sender changes its resistance values as
the generator set: its respective pressure/temperature changes, it is
working correctly. An inoperative sender will either be
! A panel with a start/stop switch open or shorted. Refer to Figure 8-4 and Figure 8-5 for
resistance values.
! A panel with a start/stop switch and two gauges
(engine oil pressure and water temperature) 2-Meter and 4-Meter Panels
! A panel with a start/stop switch and four gauges (DC Temperature Resistance
voltmeter, engine oil pressure, water temperature, 60"C (140"F) 134.0 ±10 ohms
and hourmeter) 90"C (194"F) 51.5 ±4 ohms
100"C (212"F) 38.0 ±3 ohms
If difficulty with the remote operation occurs, test the
switch, gauges, and gauge senders using the following Figure 8-4 Water Temperature Sender Resistance
procedures. See Sections 10.5 through 10.7 for wiring
diagrams. 2-Meter and 4-Meter Panels
Pressure Resistance
0 kPa (0 psi) 10 ohms
345 kPa (50 psi) 80 ohms
690 kPa (100 psi) 135 ohms
Figure 8-5 Oil Pressure Sender Resistance
TP-6053 7/04 Section 8 Component Troubleshooting 43

Refer to Figure 8-6 for troubleshooting information on the remote start panels.

Remote start/stop switch Remote switch: yellow/red Place the ohmmeter on the Continuity, the switch is
wire terminal and black wire R x 1 scale. functional. Open, replace
terminal. Press the rocker switch to the switch.
START position.
Remote switch: grey/black Place the ohmmeter on the Continuity, the switch is
wire terminal and black wire R x 1 scale. functional.
terminal. Press the rocker switch to the
STOP position.
Generator set ON light, Connect the red test lead to Place the controller rocker If 12-volts DC is present and
gauge lights, DC voltmeter, P3-4 and black test lead to switch to the START position. the component does not
and hourmeter P3-1. Stop the generator set when function after the J3 is
the test is complete. connected to the controller
Generator set does not need P3, replace the
to be running, just cranking component(s).
for this test.
Note: If the hourmeter is not
illuminated, test it by
connecting it to a 12-volt
battery.
Note: The hourmeter is
polarity sensitive.
Water temperature gauge Connect the red test lead to Start the generator set for the If 0.5--12-volts DC is present
P3-4 (socket side) and black test. and the gauge does not
test lead to P3-2 (socket function after the J3 is
side). connected to controller,
replace the gauge.
Oil pressure gauge Connect the red test lead to Start the generator set for the If 0.5--12-volts DC is present
P3-4 (socket side) and black test. and the gauge does not
test lead to P3-3 (socket function after the J3 is
side). connected to the controller,
replace the gauge.
Note: Check continuity of gauge wiring and extension harness before replacing components.
Figure 8-6 Remote Start Panels Troubleshooting
44 Section 8 Component Troubleshooting TP-6053 7/04

Section 9 Generator Disassembly/Reassembly
9.1 Disassembly 8. Remove the tie wraps from the wire harness as
necessary. Disconnect the F1 connectors from the
Disconnect all the external connections—battery cables resistor leads.
at the battery (negative (--) lead first), AC-output leads in
the controller, remote start panel at the controller P3 1
connector, water line at the seawater pump, fuel line at
the fuel pump filter inlet, and exhaust line at the mixing
elbow. Observe all the safety precautions listed at the 2
beginning of this manual during the disassembly/
3
reassembly procedures.
Note: Because this manual covers several models, the 4

procedure for disassembly may vary because of
product updates and the assembly variations.
Note: The voltage regulator is located in the controller

box. Remove the controller cover to service the
voltage regulator. Adjustments are possible CD-250000-AJ
without removing the voltage regulator from the 1. Controller cover

2. P4 (22-pin) connector
controller. 3. Ground strap
4. Generator end panel
1. Remove the end panel from the alternator end of
the generator set. See Figure 9-1. Figure 9-1 Covers
2. Loosen the four screws and lift off the controller

2
cover.
3. Disconnect the P4 (22-pin) connector from J4.
4. Remove the bolt and disconnect the ground strap.
Note: It is possible to connect the output leads in 1

various positions for different volt
configurations. Mark leads 1, 2, 3, and 4 for
correct reconnection.
5. Disconnect the generator output leads 1, 2, 3, and

4 from the circuit breaker and neutral stud (L0).
558863
6. Remove the four controller mount locknuts. See 1. Controller mount locknut
Figure 9-2. 2. Neutral stud (L0)
Figure 9-2 Controller Removal

7. Lift the controller from the rubber mounts while
guiding the leads through the bottom hole of the
controller box.
TP-6053 7/04 Section 9 Generator Disassembly/Reassembly 45

9. Disconnect the P7 (FP and FN) and P6 (F1 and F2) 12. Disconnect the main field rotor leads from the
connectors. See Figure 9-3. rectifier board positive/negative terminals.
Remove the bolt and washer.
10. Remove the four bolts to remove the exciter field.
See Figure 9-3. 13. Remove the armature from the shaft, guiding rotor
leads through the armature bores. See Figure 9-4.
11. Remove the three bolts and spacers from the
rectifier board. 14. Remove the tie wraps and disconnect the P5 (33,
44, 55, B1, and B2) wire connector.
1 15. Attach the hoist hook to the generator hoisting eye.
Note: The hoist capacity rating should be one-half

2 ton or greater.
16. Remove the two vibromount bolts. See Figure 9-5.
17. Raise the alternator end and place a wood block

3
under the locator plate. Lower the alternator until
the wood block supports the locator plate. See
4
Figure 9-5.
18. Remove the four overbolts from the end bracket.

See Figure 9-5.
558864
1. P7 connector 2
2. P6 connector
3. F1 connector
1
4. Exciter field
Figure 9-3 Exciter Field Removal
2
3
1 4 3 558866
4 1. P5 connector
2. Backplate
558865 3. Wood block
4. Vibromount bolts
1. Armature
5. Overbolts
2. Armature retaining bolt
3. Rotor leads
Figure 9-5 Supporting the Generator
4. Rectifier board
Figure 9-4 Armature Removal
46 Section 9 Generator Disassembly/Reassembly TP-6053 7/04

19. Install a sling on the stator housing. See
Figure 9-6. 1
20. Use a two-jaw puller to pull the end bracket/stator

assembly from the bearing on the rotor shaft. See
Figure 9-6. 4
21. Remove the stator assembly from the rotor. 2

Remove or rotate the fan guard, if necessary, to
3
clear the vibromounts.
22. Remove the four locknuts and remove the fan and
fan spacer. See Figure 9-7.
23. Remove the six metric bolts to remove the drive

disc/rotor assembly from the engine flywheel. See
Figure 9-7.
558867
24. Clamp the rotor in a soft-jaw vise. Remove the eight 1. Sling
2. Fan guard
bolts and remove the drive disc assembly from the 3. Two-jaw puller
rotor. See Figure 9-8. 4. End bracket
Figure 9-6 Stator Assembly Removal

9.2 Reassembly
1. Clamp the rotor in a soft-jaw vise. Install the drive 1 2
disc on the rotor with disc studs facing the rotor.
Tighten the eight bolts to 40 Nm (30 ft. lbs.). See
Figure 9-8. 3
2. Install the rotor/drive disc assembly on the engine

flywheel using six washers and bolts. Tighten the 4
bolts to 27 Nm (20 ft. lbs.).
3. Install the fan to the drive disc using four spacers,

washers, and locknuts.
Note: Install the fan with the flange side facing 558868
1. Fan
away from the flywheel. Space the studs so 2. Bolt
that they allow the fan installation in one 3. Locknut
position only. 4. Rotor assembly
Figure 9-7 Disc/Rotor and Fan Assembly
1 2
5588610
1. Drive disc
2. Rotor
3. Bolt
Figure 9-8 Drive Disc

4. Inspect the O-ring in the end bracket bearing bore 6. Use the hoist to raise the alternator end. Remove
and replace the O-ring if damaged. Use a sling to the wood block from under the locator plate. Lower
support the stator assembly while installing the the generator set and install a bolt, a large washer,
stator over the rotor. Be careful not to damage the two small washers, and a locknut in each
rotor. See Figure 9-9. vibromount. Tighten the mounting bolts to 28 Nm
(20 ft. lbs.).
5. Install the four overbolts (the two long bolts in the
lower holes). Check that the alignment marks on 7. Apply antiseize compound to the keyed end of the
the stator housing and locator plate match. See rotor shaft. Bring the rotor leads through the bores
Figure 9-10. Tighten the overbolts to 40 Nm in the armature while installing the armature on the
(30 ft. lbs.). shaft. Check the keyway of the shaft and key of the
armature for damage. Install the armature
retaining bolt and washer.
8. Use screws and lock washers to install the rotor

leads to the rectifier board at the positive (+) and
negative (--) terminals.
1 Note: Position the lock washers against the

rectifier board.
9. Install three spacers and bolts to mount the rectifier

board to the armature.
10. Install the exciter field using four bolts and

washers. The field leads are at the top. Connect
the P6, P7, and F1 connectors. See Figure 9-11.
2
5588612
1. O-ring 1
Figure 9-9 Stator Installation
5588613 5588614
1. P7 connector
1. Alignment marks 2. P6 connector
3. F1 connector
Figure 9-10 Alignment Marks 4. Exciter field
Figure 9-11 Installing Exciter Field
48 Section 9 Generator Disassembly/Reassembly TP-6053 7/04

11. Install tie wraps to secure the wires as necessary. 13. Connect the P4 (22-pin) connector. Connect the
ground strap using a bolt, washer, and lock washer
12. Route output leads 1, 2, 3, and 4 through the (install the lock washer against the ground strap).
bottom of the controller box. Check that the
grommet is intact and there are no sharp edges 14. Install the controller cover.
exposed that could damage the wiring. Install the
box on the rubber mounts and install the four 15. Install the end panel with the louvered openings
locknuts. Connect the leads to the circuit breaker down.
and neutral stud (LO) as marked during
disassembly. 16. Reconnect all the external connections—the
exhaust line to the mixing elbow, the fuel line to the
Note: Check the generator set’s nameplate to fuel pump filter inlet, the water line to the seawater
verify the original voltage configuration. See pump, the remote start panel to the controller P3
Section 10, Voltage Reconnection and connector, the AC output leads in controller, and
Wiring Diagrams, for more information the battery cables to the battery (negative (--) lead
regarding voltage reconnection. last).
17. Open the seacock and the fuel valve.

Section 10 Voltage Reconnection and Wiring Diagrams
10.1 Voltage Reconnection Do not connect the load-side terminals of the circuit
breaker together when using a factory 2-pole circuit
The following information illustrates the proper breaker. See Figure 10-1. If the installation requires a
reconnection of 4-lead generator sets. In all cases, 100--120-volt, 2-wire system, use a 1-pole circuit
follow the National Electrical Code (NEC). breaker. See Figure 10-2. When connecting stator
phase leads together, size the output lead (L1)
NOTICE accordingly. Use a jumper lead on the line side of the
Voltage reconnection. Affix a notice to the generator set after circuit breaker to balance the generator set load.
reconnecting the set to a voltage different from the voltage on
the nameplate. Order voltage reconnection decal 246242
from an authorized service distributor/dealer. LO (Neutral)
LO
GRD
10.1.1 100--120-Volt Configurations Ground
LO (Neutral) L1
Load
LO Side
GRD 1-Pole
Ground
Circuit
L1
Breaker
L2
Load
Side Line
Factory
Side
2-Pole
or (2) 1-Pole
Circuit Breakers
Line
Side
100--120 Volt, 2 Wire
4 3 2 1
Jumper
Stator Leads
Lead 60 Hz 50 Hz
L0--L1 100--120 Volt 100--120 Volt
L0--L2 100--120 Volt 100--120 Volt
100--120 Volt, 3 Wire
4 3 2 1
Stator Leads Figure 10-2 100--120 Volt, 2 Wire
60 Hz 50 Hz
L0--L1 100--120 Volt 100--120 Volt
L0--L2 100--120 Volt 100--120 Volt
Figure 10-1 100--120 Volt, 3 Wire
TP-6053 7/04 Section 10 Voltage Reconnection and Wiring Diagrams 51

10.1.2 100--120/200--240-Volt 10.1.3 200--240-Volt Configurations
Configurations
This configuration does not use a jumper lead. If the unit
This configuration does not use a jumper lead. If the unit was originally wired for straight 100--200 volt, 3 wire,
was originally wired for straight 100--120 volt, 3 wire, remove the jumper lead (see Figure 10-1 and
remove the jumper lead (see Figure 10-1 and Figure 10-2 for location).
Figure 10-2 for location). Select a circuit breaker
manufactured with a 2-pole circuit breaker. Two 1-pole LO (Neutral)
circuit breakers do not conform to NEC requirements LO
when supplying a 200--240-volt load. This is true even if GRD
Ground
they are mechanically attached together. Since leads
L1
L1 and L2 are different phases, never connect them
together.
Load
Side 1-Pole
Circuit
LO (Neutral)
LO Line Breaker
Side
Ground GRD
L2
Load L1
Side Tape to insulate
from ground
Factory
2-Pole
Circuit
Breaker 4 3 2 1 200--220--240 Volt, 2 Wire
Line
Stator Leads
Side
60 Hz 50 Hz
L0--L1 not used 200--240 Volt
Figure 10-4 200--240 Volt, 2 Wire

100--120/200--240 Volt, 3 Wire
4 3 2 1
Stator Leads
60 Hz 50 Hz
L0--L1 100--120 Volt 100--120 Volt
L0--L2 100--120 Volt 100--120 Volt
L1--L2 200--240 Volt 200--240 Volt
Figure 10-3 100--120/200--240 Volt, 3 Wire
52 Section 10 Voltage Reconnection and Wiring Diagrams TP-6053 7/04

10.2 Marine Manual (Ship-to-Shore) Transfer Switch
Electro Switch
2-Wire Generator Sets

3-Wire Generator Sets
L1 L1
To Generator 2 1 3 4 2 1 3 4
To Shore
Set Power
L2 L2
6 5 7 8 6 5 7 8 To Shore
To Generator
Set Power
L0
10 9 11 12
To Load
To Load
Kraus Naimler/American Solenoid

(Early Rectangular Design)
2-Wire Generator Sets 3-Wire Generator Sets
L1 L1
1 2 6 5
To Generator 1 2 6 5 To Shore
Set Power
L2 L2
3 4 8 7 To Generator 3 4 8 7 To Shore
Set Power
L0
9 10 14 13
To Load
To Load
Kraus Naimler/American Solenoid

(Newer Round Design)
2-Wire Generator Sets 3-Wire Generator Sets
L1 L1
3 2 4 1 To Shore 3 2 4 1
To Generator
Set Power
L2 L2
7 6 8 5 To Generator 7 6 8 5 To Shore
Set Power
L0
11 10 12 9
To Load
To Load
TP-5399-5

10.3 Wiring Diagram, Schematic
229294-N

10.4 Wiring Diagram, Point-to-Point
229294-N

10.5 Remote Start Panel 10.6 Remote Start and 2-Meter
Panel
+ --
+ --
P N
Stop
10-amp Local P N
P1-9 Stop
fuse switch Local
10-amp P1-9
switch
P 47 43 N fuse
Start
P1-14 P2-4 P2-5 P2-6 P 47 Start 43 N W.T. O.P.
sender sender
P1-14 P2-4 P2-5 P2-6
K2 Relay
circuit
board K2 Relay
K1
circuit
K1 board
P2-3 P2-7 P2-8 P2-9
P2-3 P2-7 P2-8 P2-9 P4-2 P4-3
70 47 43 N
Grey/
Black 70 47 43 N 5 7C
P3-4 P3-5 P3-6 P3-1
Grey/
J3-4 J3-5 J3-6 J3-1
P3-4 P3-5 Black P3-6 P3-1 P3-2 P3-3
Violet Black J3-4 J3-5 J3-1 J3-2 J3-3
Stop
Yellow/ Violet Stop Black Tan
Remote J3-6
Red L. Blue
Start switch Yellow/
Remote
Red Start switch
Gen. ON light TP-5588-7

Gen. ON light
Water temp.
gauge
Oil pressure
gauge
TP-5588-7

10.7 Remote Start and 4-Meter
Panel
+ --
P N
Stop
Local P1-9
10-amp
switch
fuse
P 47 43 N
Start W.T. O.P.
P1-14 P2-4 P2-5 P2-6 sender sender
K2 Relay
circuit
K1 board
P2-3 P2-7 P2-8 P2-9 P4-2 P4-3
70 47 43 N 5 7C
Grey/
P3-4 P3-5 Black P3-6 P3-1 P3-2 P3-3
J3-4 J3-5 J3-1 J3-2 J3-3
Violet Stop Black Tan L. Blue
J3-6
Yellow/
Red Remote
Start
switch
Gen. ON light
Water temp.
gauge
Oil pressure
gauge
DC voltmeter
Hourmeter
TP-5588-7

Appendix A Abbreviations
The following list contains abbreviations that may appear in this publication.
A, amp ampere cfm cubic feet per minute exh. exhaust
ABDC after bottom dead center CG center of gravity ext. external
AC alternating current CID cubic inch displacement F Fahrenheit, female
A/D analog to digital CL centerline fglass. fiberglass
ADC analog to digital converter cm centimeter FHM flat head machine (screw)
adj. adjust, adjustment CMOS complementary metal oxide fl. oz. fluid ounce
ADV advertising dimensional substrate (semiconductor) flex. flexible
drawing cogen. cogeneration freq. frequency
AHWT anticipatory high water com communications (port) FS full scale
temperature coml commercial ft. foot, feet
AISI American Iron and Steel Coml/Rec Commercial/Recreational ft. lb. foot pounds (torque)
Institute conn. connection
ALOP anticipatory low oil pressure ft./min. feet per minute
cont. continued g gram
alt. alternator CPVC chlorinated polyvinyl chloride
Al aluminum ga. gauge (meters, wire size)
crit. critical gal. gallon
ANSI American National Standards CRT cathode ray tube
Institute gen. generator
(formerly American Standards CSA Canadian Standards genset generator set
Association, ASA) Association GFI ground fault interrupter
AO anticipatory only CT current transformer
Cu copper GND, ground
API American Petroleum Institute
cu. in. cubic inch gov. governor
approx. approximate, approximately
cw. clockwise gph gallons per hour
AR as required, as requested
CWC city water-cooled gpm gallons per minute
AS as supplied, as stated, as
suggested cyl. cylinder gr. grade, gross
ASE American Society of Engineers D/A digital to analog GRD equipment ground
ASME American Society of DAC digital to analog converter gr. wt. gross weight
Mechanical Engineers dB decibel HxWxD height by width by depth
assy. assembly dBA decibel (A weighted) HC hex cap
ASTM American Society for Testing DC direct current HCHT high cylinder head temperature
Materials DCR direct current resistance HD heavy duty
ATDC after top dead center deg., ° degree HET high exhaust temperature,
ATS automatic transfer switch high engine temperature
dept. department
auto. automatic hex hexagon
dia. diameter
aux. auxiliary Hg mercury (element)
DI/EO dual inlet/end outlet
A/V audiovisual HH hex head
DIN Deutsches Institut fur Normung
avg. average e. V. HHC hex head cap
AVR automatic voltage regulator (also Deutsche Industrie HP horsepower
AWG American Wire Gauge Normenausschuss) hr. hour
AWM appliance wiring material DIP dual inline package HS heat shrink
bat. battery DPDT double-pole, double-throw hsg. housing
BBDC before bottom dead center DPST double-pole, single-throw HVAC heating, ventilation, and air
BC battery charger, battery DS disconnect switch conditioning
charging DVR digital voltage regulator HWT high water temperature
BCA battery charging alternator E, emer. emergency (power source) Hz hertz (cycles per second)
BCI Battery Council International EDI electronic data interchange IC integrated circuit
BDC before dead center EFR emergency frequency relay ID inside diameter, identification
BHP brake horsepower e.g. for example (exempli gratia) IEC International Electrotechnical
blk. black (paint color), block EG electronic governor Commission
(engine) EGSA Electrical Generating Systems IEEE Institute of Electrical and
blk. htr. block heater Association Electronics Engineers
BMEP brake mean effective pressure EIA Electronic Industries IMS improved motor starting
bps bits per second Association in. inch
br. brass EI/EO end inlet/end outlet in. H2O inches of water
BTDC before top dead center EMI electromagnetic interference in. Hg inches of mercury
Btu British thermal unit emiss. emission in. lb. inch pounds
Btu/min. British thermal units per minute eng. engine Inc. incorporated
C Celsius, centigrade EPA Environmental Protection ind. industrial
Agency int. internal
cal. calorie
EPS emergency power system int./ext. internal/external
CARB California Air Resources Board
CB circuit breaker ER emergency relay I/O input/output
cc cubic centimeter ES engineering special, IP iron pipe
engineered special ISO International Organization for
CCA cold cranking amps ESD electrostatic discharge Standardization
ccw. counterclockwise est. estimated J joule
CEC Canadian Electrical Code E-Stop emergency stop JIS Japanese Industry Standard
cert. certificate, certification, certified etc. et cetera (and so forth)
cfh cubic feet per hour
TP-6053 7/04 Appendix A-1

k kilo (1000) MTBF mean time between failure RHM round head machine (screw)
K kelvin MTBO mean time between overhauls rly. relay
kA kiloampere mtg. mounting rms root mean square
KB kilobyte (210 bytes) MW megawatt rnd. round
kg kilogram mW milliwatt ROM read only memory
kg/cm2 kilograms per square µF microfarad rot. rotate, rotating
centimeter N, norm. normal (power source) rpm revolutions per minute
kgm kilogram-meter NA not available, not applicable RS right side
kg/m3 kilograms per cubic meter nat. gas natural gas RTV room temperature vulcanization
kHz kilohertz NBS National Bureau of Standards SAE Society of Automotive
kJ kilojoule NC normally closed Engineers
km kilometer NEC National Electrical Code scfm standard cubic feet per minute
kOhm, kΩ kilo-ohm NEMA National Electrical SCR silicon controlled rectifier
kPa kilopascal Manufacturers Association s, sec. second
kph kilometers per hour NFPA National Fire Protection SI Systeme international d’unites,
kV kilovolt Association International System of Units
kVA kilovolt ampere Nm newton meter SI/EO side in/end out
kVAR kilovolt ampere reactive NO normally open sil. silencer
kW kilowatt no., nos. number, numbers SN serial number
kWh kilowatt-hour NPS National Pipe, Straight SPDT single--pole, double--throw
kWm kilowatt mechanical NPSC National Pipe, Straight-coupling SPST single--pole, single--throw
L liter NPT National Standard taper pipe spec, specs
LAN local area network thread per general use specification(s)
L x W x H length by width by height NPTF National Pipe, Taper-Fine sq. square
lb. pound, pounds NR not required, normal relay sq. cm square centimeter
lbm/ft3 pounds mass per cubic feet ns nanosecond sq. in. square inch
LCB line circuit breaker OC overcrank SS stainless steel
LCD liquid crystal display OD outside diameter std. standard
ld. shd. load shed OEM original equipment stl. steel
manufacturer tach. tachometer
LED light emitting diode OF overfrequency
Lph liters per hour TD time delay
opt. option, optional TDC top dead center
Lpm liters per minute OS oversize, overspeed
LOP low oil pressure TDEC time delay engine cooldown
OSHA Occupational Safety and Health TDEN time delay emergency to
LP liquefied petroleum Administration normal
LPG liquefied petroleum gas OV overvoltage TDES time delay engine start
LS left side oz. ounce TDNE time delay normal to
Lwa sound power level, A weighted p., pp. page, pages emergency
LWL low water level PC personal computer TDOE time delay off to emergency
LWT low water temperature PCB printed circuit board TDON time delay off to normal
m meter, milli (1/1000) pF picofarad temp. temperature
M mega (106 when used with SI PF power factor term. terminal
units), male ph., ∅ phase TIF telephone influence factor
m3 cubic meter
PHC Phillips head crimptite (screw) TIR total indicator reading
m3/min. cubic meters per minute
PHH Phillips hex head (screw) tol. tolerance
mA milliampere
PHM pan head machine (screw) turbo. turbocharger
man. manual
PLC programmable logic control typ. typical (same in multiple
max. maximum locations)
PMG permanent-magnet generator
MB megabyte (220 bytes) pot potentiometer, potential UF underfrequency
MCM one thousand circular mils ppm parts per million UHF ultrahigh frequency
MCCB molded-case circuit breaker PROM programmable read-only UL Underwriter’s Laboratories, Inc.
meggar megohmmeter memory UNC unified coarse thread (was NC)
MHz megahertz psi pounds per square inch UNF unified fine thread (was NF)
mi. mile pt. pint univ. universal
mil one one-thousandth of an inch PTC positive temperature coefficient US undersize, underspeed
min. minimum, minute PTO power takeoff UV ultraviolet, undervoltage
misc. miscellaneous PVC polyvinyl chloride V volt
MJ megajoule qt. quart, quarts VAC volts alternating current
mJ millijoule qty. quantity VAR voltampere reactive
mm millimeter R replacement (emergency) VDC volts direct current
mOhm, mΩ power source VFD vacuum fluorescent display
milliohm rad. radiator, radius VGA video graphics adapter
MOhm, MΩ RAM random access memory
megohm VHF very high frequency
RDO relay driver output W watt
MOV metal oxide varistor ref. reference
MPa megapascal WCR withstand and closing rating
rem. remote w/ with
mpg miles per gallon Res/Coml Residential/Commercial
mph miles per hour w/o without
RFI radio frequency interference wt. weight
MS military standard
RH round head xfmr transformer
m/sec. meters per second
A-2 Appendix TP-6053 7/04

Appendix B Common Hardware Application Guidelines
Use the information below and on the following pages to Steps for common hardware application:
identify proper fastening techniques when no specific
reference for reassembly is made. 1. Determine entry hole type: round or slotted.
Bolt/Screw Length: When bolt/screw length is not given, 2. Determine exit hole type: fixed female thread
use Figure 1 as a guide. As a general rule, a minimum (weld nut), round, or slotted.
length of one thread beyond the nut and a maximum
length of 1/2 the bolt/screw diameter beyond the nut is For round and slotted exit holes, determine if
hardware is greater than 1/2 inch in diameter, or
the preferred method.
1/2 inch in diameter or less. Hardware that is
Washers and Nuts: Use split lock washers as a bolt greater than 1/2 inch in diameter takes a standard
locking device where specified. Use SAE flat washers nut and SAE washer. Hardware 1/2 inch or less in
with whiz nuts, spiralock nuts, or standard nuts and diameter can take a properly torqued whiz nut or
spiralock nut. See Figure 2.
preloading (torque) of the bolt in all other applications.
3. Follow these SAE washer rules after determining
See Appendix C, General Torque Specifications, and
exit hole type:
other torque specifications in the service literature.
a. Always use a washer between hardware and a
slot.
Preferred Nut/Bolt Clearance
1 2 b. Always use a washer under a nut (see 2 above
for exception).
c. Use a washer under a bolt when the female

thread is fixed (weld nut).
4. Refer to Figure 2, which depicts the preceding

hardware configuration possibilities.
Unacceptable Nut/Bolt Clearance
2
3 1
G-585
1. 1/2 of bolt diameter

2. Min. 1 full thread beyond top of nut
3. Below top of nut
Figure 1 Acceptable Bolt Lengths

5
4
6
G-585
1. Cap screw
2. Entry hole types
3. Standard nut and SAE washer
4. Whiz nut or spiralock: up to 1/2 in. dia. hardware
5. Weld nuts: above 1/2 in. dia. hardware
6. Exit hole types
Figure 2 Acceptable Hardware Combinations

Appendix C General Torque Specifications
Use the following torque specifications when service oiled threads. Increase values by 15% for nonplated
literature instructions give no specific torque values. threads. All torque values are +0%/--10%.
The charts list values for new plated, zinc phosphate, or
American Standard Fasteners Torque Specifications

Assembled into Cast Iron or Steel Assembled into
Torque Aluminum
Size Measurement Grade 2 Grade 5 Grade 8 Grade 2 or 5
8-32 Nm (in. lb.) 1.8 (16) 2.3 (20) — 1.8 (16)
10-24 Nm (in. lb.) 2.9 (26) 3.6 (32) — 2.9 (26)
10-32 Nm (in. lb.) 2.9 (26) 3.6 (32) — 2.9 (26)
1/4-20 Nm (in. lb.) 6.8 (60) 10.8 (96) 14.9 (132) 6.8 (60)
1/4-28 Nm (in. lb.) 8.1 (72) 12.2 (108) 16.3 (144) 8.1 (72)
5/16-18 Nm (in. lb.) 13.6 (120) 21.7 (192) 29.8 (264) 13.6 (120)
5/16-24 Nm (in. lb.) 14.9 (132) 23.1 (204) 32.5 (288) 14.9 (132)
3/8-16 Nm (ft. lb.) 24.0 (18) 38.0 (28) 53.0 (39) 24.0 (18)
3/8-24 Nm (ft. lb.) 27.0 (20) 42.0 (31) 60.0 (44) 27.0 (20)
7/16-14 Nm (ft. lb.) 39.0 (29) 60.0 (44) 85.0 (63) —
7/16-20 Nm (ft. lb.) 43.0 (32) 68.0 (50) 95.0 (70) —
1/2-13 Nm (ft. lb.) 60.0 (44) 92.0 (68) 130.0 (96) —
1/2-20 Nm (ft. lb.) 66.0 (49) 103.0 (76) 146.0 (108) —
9/16-12 Nm (ft. lb.) 81.0 (60) 133.0 (98) 187.0 (138) —
9/16-18 Nm (ft. lb.) 91.0 (67) 148.0 (109) 209.0 (154) —
5/8-11 Nm (ft. lb.) 113.0 (83) 183.0 (135) 259.0 (191) —
5/8-18 Nm (ft. lb.) 128.0 (94) 208.0 (153) 293.0 (216) —
3/4-10 Nm (ft. lb.) 199.0 (147) 325.0 (240) 458.0 (338) —
3/4-16 Nm (ft. lb.) 222.0 (164) 363.0 (268) 513.0 (378) —
1-8 Nm (ft. lb.) 259.0 (191) 721.0 (532) 1109.0 (818) —
1-12 Nm (ft. lb.) 283.0 (209) 789.0 (582) 1214.0 (895) —
Metric Fasteners Torque Specifications, Measured in Nm (ft. lb.)

Assembled into Cast Iron or Steel Assembled into
Aluminum
Size (mm) Grade 5.8 Grade 8.8 Grade 10.9 Grade 5.8 or 8.8
M6 x 1.00 5.6 (4) 9.9 (7) 14.0 (10) 5.6 (4)
M8 x 1.25 13.6 (10) 25.0 (18) 35.0 (26) 13.6 (10)
M8 x 1.00 21.0 (16) 25.0 (18) 35.0 (26) 21.0 (16)
M10 x 1.50 27.0 (20) 49.0 (35) 68.0 (50) 27.0 (20)
M10 x 1.25 39.0 (29) 49.0 (35) 68.0 (50) 39.0 (29)
M12 x 1.75 47.0 (35) 83.0 (61) 117.0 (86) —
M12 x 1.50 65.0 (48) 88.0 (65) 125.0 (92) —
M14 x 2.00 74.0 (55) 132.0 (97) 185.0 (136) —
M14 x 1.50 100.0 (74) 140.0 (103) 192.0 (142) —
M16 x 2.00 115.0 (85) 200.0 (148) 285.0 (210) —
M16 x 1.50 141.0 (104) 210.0 (155) 295.0 (218) —
M18 x 2.50 155.0 (114) 275.0 (203) 390.0 (288) —
M18 x 1.50 196.0 (145) 305.0 (225) 425.0 (315) —

Appendix D Common Hardware Identification
Screw/Bolts/Studs Nuts Hardness Grades

Head Styles Nut Styles American Standard
Hex Head or Machine Head Hex Head Grade 2
Hex Head or Machine Head

Lock or Elastic Grade 5
with Washer
Flat Head (FHM) Square Grade 8
Grade 8/9 (Hex Socket

Round Head (RHM) Cap or Acorn
Head)
Metric
Pan Head Wing
Number stamped on 5.8
Hex Socket Head Cap or Washers hardware; 5.8 shown
Allen! Head Cap
Washer Styles
Hex Socket Head or Allen!
Head Shoulder Bolt Plain
Sheet Metal Screw Split Lock or Spring
Stud Spring or Wave
Drive Styles
External Tooth Lock
Hex
Internal Tooth Lock
Hex and Slotted
Internal-External Tooth Lock
Phillips#
Slotted
Hex Socket
Allen! head screw is a trademark of Holo-Krome Co.

Phillips# screw is a registered trademark of Phillips Screw Company.
Sample Dimensions
American Standard (Screws, Bolts, Studs, and Nuts) Plain Washers
1/4-20 x 1 9/32 x 5/8 x 1/16
Length In Inches (Screws and Bolts) Thickness
Threads Per Inch External Dimension
Major Thread Diameter In Fractional Inches Or Screw Number Size Internal Dimension
Metric (Screws, Bolts, Studs, and Nuts)
M8-1.25 x 20 Lock Washers
Length In Millimeters (Screws and Bolts) 5/8
Distance Between Threads In Millimeters Internal Dimension
Major Thread Diameter In Millimeters

Appendix E Common Hardware List
The Common Hardware List lists part numbers and dimensions for common hardware items.
American Standard
Part No. Dimensions Part No. Dimensions Part No. Dimensions Type
Hex Head Bolts (Grade 5) Hex Head Bolts, cont. Hex Nuts
X-465-17 1/4-20 x .38 X-6238-14 3/8-24 x .75 X-6009-1 1-8 Standard
X-465-6 1/4-20 x .50 X-6238-16 3/8-24 x 1.25
X-465-2 1/4-20 x .62 X-6238-21 3/8-24 x 4.00 X-6210-3 6-32 Whiz
X-465-16 1/4-20 x .75 X-6238-22 3/8-24 x 4.50 X-6210-4 8-32 Whiz
X-465-18 1/4-20 x .88 X-6210-5 10-24 Whiz
X-465-7 1/4-20 x 1.00 X-6024-5 7/16-14 x .75
X-6024-2 7/16-14 x 1.00 X-6210-1 10-32 Whiz
X-465-8 1/4-20 x 1.25
X-465-9 1/4-20 x 1.50 X-6024-8 7/16-14 x 1.25 X-6210-2 1/4-20 Spiralock
X-465-10 1/4-20 x 1.75 X-6024-3 7/16-14 x 1.50 X-6210-6 1/4-28 Spiralock
X-465-11 1/4-20 x 2.00 X-6024-4 7/16-14 x 2.00 X-6210-7 5/16-18 Spiralock
X-465-12 1/4-20 x 2.25 X-6024-11 7/16-14 x 2.75 X-6210-8 5/16-24 Spiralock
X-465-14 1/4-20 x 2.75 X-6024-12 7/16-14 x 6.50
X-6210-9 3/8-16 Spiralock
X-465-21 1/4-20 x 5.00 X-129-15 1/2-13 x .75 X-6210-10 3/8-24 Spiralock
X-465-25 1/4-28 x .38 X-129-17 1/2-13 x 1.00 X-6210-11 7/16-14 Spiralock
X-465-20 1/4-28 x 1.00 X-129-18 1/2-13 x 1.25 X-6210-12 1/2-13 Spiralock
X-125-33 5/16-18 x .50 X-129-19 1/2-13 x 1.50 X-6210-15 7/16-20 Spiralock
X-125-23 5/16-18 x .62 X-129-20 1/2-13 x 1.75 X-6210-14 1/2-20 Spiralock
X-125-3 5/16-18 x .75 X-129-21 1/2-13 x 2.00
X-129-22 1/2-13 x 2.25 X-85-3 5/8-11 Standard
X-125-31 5/16-18 x .88 X-88-12 3/4-10 Standard
X-125-5 5/16-18 x 1.00 X-129-23 1/2-13 x 2.50
X-129-24 1/2-13 x 2.75 X-89-2 1/2-20 Standard
X-125-24 5/16-18 x 1.25
X-125-34 5/16-18 x 1.50 X-129-25 1/2-13 x 3.00
X-125-25 5/16-18 x 1.75 X-129-27 1/2-13 x 3.50
X-125-26 5/16-18 x 2.00 X-129-29 1/2-13 x 4.00 Washers
230578 5/16-18 x 2.25 X-129-30 1/2-13 x 4.50 Bolt/
X-125-29 5/16-18 x 2.50 X-463-9 1/2-13 x 5.50
X-129-44 1/2-13 x 6.00 Part No. ID OD Thick. Screw
X-125-27 5/16-18 x 2.75
X-125-28 5/16-18 x 3.00 X-129-51 1/2-20 x .75 X-25-46 .125 .250 .022 #4
X-125-22 5/16-18 x 4.50 X-129-45 1/2-20 x 1.25 X-25-9 .156 .375 .049 #6
X-125-32 5/16-18 x 5.00 X-129-52 1/2-20 x 1.50 X-25-48 .188 .438 .049 #8
X-125-35 5/16-18 x 5.50 X-25-36 .219 .500 .049 #10
X-125-36 5/16-18 x 6.00 X-6021-3 5/8-11 x 1.00 X-25-40 .281 .625 .065 1/4
X-125-40 5/16-18 x 6.50 X-6021-4 5/8-11 x 1.25 X-25-85 .344 .687 .065 5/16
X-6021-2 5/8-11 x 1.50 X-25-37 .406 .812 .065 3/8
X-125-43 5/16-24 x 1.75 X-6021-1 5/8-11 x 1.75 X-25-34 .469 .922 .065 7/16
X-125-44 5/16-24 x 2.50 273049 5/8-11 x 2.00
X-125-30 5/16-24 x .75 X-25-26 .531 1.062 .095 1/2
X-6021-5 5/8-11 x 2.25 X-25-15 .656 1.312 .095 5/8
X-125-39 5/16-24 x 2.00 X-6021-6 5/8-11 x 2.50
X-125-38 5/16-24 x 2.75 X-25-29 .812 1.469 .134 3/4
X-6021-7 5/8-11 x 2.75
X-25-127 1.062 2.000 .134 1
X-6238-2 3/8-16 x .62 X-6021-12 5/8-11 x 3.75
X-6238-10 3/8-16 x .75 X-6021-11 5/8-11 x 4.50
X-6238-3 3/8-16 x .88 X-6021-10 5/8-11 x 6.00
X-6238-11 3/8-16 x 1.00 X-6021-9 5/8-18 x 2.50
X-6238-4 3/8-16 x 1.25
X-6238-5 3/8-16 x 1.50 X-6239-1 3/4-10 x 1.00
X-6238-1 3/8-16 x 1.75 X-6239-8 3/4-10 x 1.25
X-6238-6 3/8-16 x 2.00 X-6239-2 3/4-10 x 1.50
X-6238-17 3/8-16 x 2.25 X-6239-3 3/4-10 x 2.00
X-6238-7 3/8-16 x 2.50 X-6239-4 3/4-10 x 2.50
X-6238-8 3/8-16 x 2.75 X-6239-5 3/4-10 x 3.00
X-6238-9 3/8-16 x 3.00 X-6239-6 3/4-10 x 3.50
X-6238-19 3/8-16 x 3.25 X-792-1 1-8 x 2.25
X-6238-12 3/8-16 x 3.50 X-792-5 1-8 x 3.00
X-6238-20 3/8-16 x 3.75 X-792-8 1-8 x 5.00
X-6238-13 3/8-16 x 4.50
X-6238-18 3/8-16 x 5.50
X-6238-25 3/8-16 x 6.50

Metric
Hex head bolts are hardness grade 8.8 unless noted.
Part No. Dimensions Part No. Dimensions Part No. Dimensions

Hex Head Bolts (Partial Thread) Hex Head Bolts (Partial Thread), Hex Head Bolts (Full Thread),
M931-05055-60 M5-0.80 x 55 continued continued
M931-06040-60 M6-1.00 x 40 M960-16090-60 M16-1.50 x 90 M933-12016-60 M12-1.75 x 16
M931-06055-60 M6-1.00 x 55 M931-16090-60 M16-2.00 x 90 M933-12020-60 M12-1.75 x 20
M931-06060-60 M6-1.00 x 60 M931-16100-60 M16-2.00 x 100 M961-12020-60F M12-1.50 x 20
M931-06060-SS M6-1.00 x 60 M931-16100-82 M16-2.00 x 100* M933-12025-60 M12-1.75 x 25
M931-06070-60 M6-1.00 x 70 M931-16120-60 M16-2.00 x 120 M933-12025-82 M12-1.75 x 25*
M931-06070-SS M6-1.00 x 70 M931-16150-60 M16-2.00 x 150 M961-12030-60 M12-1.25 x 30
M931-06075-60 M6-1.00 x 75 M933-12030-82 M12-1.75 x 30*
M931-06090-60 M6-1.00 x 90 M931-20065-60 M20-2.50 x 65 M961-12030-82F M12-1.50 x 30*
M931-06145-60 M6-1.00 x 145 M931-20090-60 M20-2.50 x 90 M933-12030-60 M12-1.75 x 30
M931-06150-60 M6-1.00 x 150 M931-20100-60 M20-2.50 x 100 M933-12035-60 M12-1.75 x 35
M931-20120-60 M20-2.50 x 120 M961-12040-82 M12-1.25 x 40*
M931-08035-60 M8-1.25 x 35 M931-20140-60 M20-2.50 x 140 M933-12040-60 M12-1.75 x 40
M931-08040-60 M8-1.25 x 40 M931-20160-60 M20-2.50 x 160 M933-12040-82 M12-1.75 x 40*
M931-08045-60 M8-1.25 x 45
M931-08050-60 M8-1.25 x 50 M931-22090-60 M22-2.50 x 90 M961-14025-60 M14-1.50 x 25
M931-08055-60 M8-1.25 x 55 M931-22120-60 M22-2.50 x 120 M933-14025-60 M14-2.00 x 25
M931-08055-82 M8-1.25 x 55* M931-22160-60 M22-2.50 x 160 M961-14050-82 M14-1.50 x 50*
M931-08060-60 M8-1.25 x 60 M931-24090-60 M24-3.00 x 90
M931-08070-60 M8-1.25 x 70 M961-16025-60 M16-1.50 x 25
M931-24120-60 M24-3.00 x 120 M933-16025-60 M16-2.00 x 25
M931-08070-82 M8-1.25 x 70* M931-24160-60 M24-3.00 x 160
M931-08075-60 M8-1.25 x 75 M961-16030-82 M16-1.50 x 30*
M931-24200-60 M24-3.00 x 200 M933-16030-82 M16-2.00 x 30*
M931-08080-60 M8-1.25 x 80
M931-08090-60 M8-1.25 x 90 M933-16035-60 M16-2.00 x 35
M931-08095-60 M8-1.25 x 95 Hex Head Bolts (Full Thread) M961-16040-60 M16-1.50 x 40
M931-08100-60 M8-1.25 x 100 M933-16040-60 M16-2.00 x 40
M933-04006-60 M4-0.70 x 6 M961-16045-82 M16-1.50 x 45*
M931-08110-60 M8-1.25 x 110
M931-08120-60 M8-1.25 x 120 M933-05030-60 M5-0.80 x 30 M933-16045-82 M16-2.00 x 45*
M931-08130-60 M8-1.25 x 130 M933-05035-60 M5-0.80 x 35 M933-16050-60 M16-2.00 x 50
M931-08140-60 M8-1.25 x 140 M933-05050-60 M5-0.80 x 50 M933-16050-82 M16-2.00 x 50*
M931-08150-60 M8-1.25 x 150 M933-16060-60 M16-2.00 x 60
M933-06010-60 M6-1.00 x 10 M933-16070-60 M16-2.00 x 70
M931-08200-60 M8-1.25 x 200 M933-06012-60 M6-1.00 x 12
M931-10040-82 M10-1.25 x 40* M933-06014-60 M6-1.00 x 14 M933-18035-60 M18-2.50 x 35
M931-10040-60 M10-1.50 x 40 M933-06016-60 M6-1.00 x 16 M933-18050-60 M18-2.50 x 50
M931-10045-60 M10-1.50 x 45 M933-06020-60 M6-1.00 x 20 M933-18060-60 M18-2.50 x 60
M931-10050-60 M10-1.50 x 50 M933-06025-60 M6-1.00 x 25 M933-20050-60 M20-2.50 x 50
M931-10050-82 M10-1.25 x 50* M933-06030-60 M6-1.00 x 30 M933-20055-60 M20-2.50 x 55
M931-10055-60 M10-1.50 x 55 M933-06040-60 M6-1.00 x 40
M931-10060-60 M10-1.50 x 60 M933-06050-60 M6-1.00 x 50 M933-24060-60 M24-3.00 x 60
M931-10065-60 M10-1.50 x 65 M933-24065-60 M24-3.00 x 65
M933-07025-60 M7-1.00 x 25 M933-24070-60 M24-3.00 x 70
M931-10070-60 M10-1.50 x 70
M931-10080-60 M10-1.50 x 80 M933-08010-60 M8-1.25 x 10
M931-10080-82 M10-1.25 x 80* M933-08012-60 M8-1.25 x 12 Pan Head Machine Screws
M931-10090-60 M10-1.50 x 90 M933-08016-60 M8-1.25 x 16
M931-10090-82 M10-1.50 x 90* M933-08020-60 M8-1.25 x 20 M7985A-03010-20 M3-0.50 x 10
M931-10100-60 M10-1.50 x 100 M933-08025-60 M8-1.25 x 25 M7985A-03012-20 M3-0.50 x 12
M931-10110-60 M10-1.50 x 110 M933-08030-60 M8-1.25 x 30 M7985A-04010-20 M4-0.70 x 10
M931-10120-60 M10-1.50 x 120 M933-08030-82 M8-1.25 x 30* M7985A-04016-20 M4-0.70 x 16
M931-10130-60 M10-1.50 x 130 M7985A-04020-20 M4-0.70 x 20
M931-10140-60 M10-1.50 x 140 M933-10012-60 M10-1.50 x 12
M961-10020-60 M10-1.25 x 20 M7985A-04050-20 M4-0.70 x 50
M931-10180-60 M10-1.50 x 180 M7985A-04100-20 M4-0.70 x 100
M931-10235-60 M10-1.50 x 235 M933-10020-60 M10-1.50 x 20
M931-10260-60 M10-1.50 x 260 M933-10025-60 M10-1.50 x 25 M7985A-05010-20 M5-0.80 x 10
M960-10330-60 M10-1.25 x 330 M961-10025-60 M10-1.25 x 25 M7985A-05012-20 M5-0.80 x 12
M933-10025-82 M10-1.50 x 25* M7985A-05016-20 M5-0.80 x 16
M931-12045-60 M12-1.75 x 45 M961-10030-60 M10-1.25 x 30 M7985A-05020-20 M5-0.80 x 20
M960-12050-60 M12-1.25 x 50 M933-10030-60 M10-1.50 x 30 M7985A-05025-20 M5-0.80 x 25
M960-12050-82 M12-1.25 x 50* M933-10030-82 M10-1.50 x 30* M7985A-05030-20 M5-0.80 x 30
M931-12050-60 M12-1.75 x 50 M961-10035-60 M10-1.25 x 35 M7985A-05080-20 M5-0.80 x 80
M931-12050-82 M12-1.75 x 50* M933-10035-60 M10-1.50 x 35 M7985A-05100-20 M5-0.80 x 100
M931-12055-60 M12-1.75 x 55 M933-10035-82 M10-1.50 x 35*
M931-12060-60 M12-1.75 x 60 M961-10040-60 M10-1.25 x 40 M7985A-06100-20 M6-1.00 x 100
M931-12060-82 M12-1.75 x 60*
M931-12065-60 M12-1.75 x 65 Flat Head Machine Screws
M931-12075-60 M12-1.75 x 75
M931-12080-60 M12-1.75 x 80 M965A-04012-SS M4-0.70 x 12
M931-12090-60 M12-1.75 x 90 M965A-05012-SS M5-0.80 x 12
M931-12100-60 M12-1.75 x 100 M965A-05016-20 M5-0.80 x 16
M931-12110-60 M12-1.75 x 110 M965A-06012-20 M6-1.00 x 12
* This metric hex bolt’s hardness is grade 10.9.

Metric, continued
Part No. Dimensions Type
Hex Nuts
M934-03-50 M3-0.50 Standard
M934-04-50 M4-0.70 Standard
M934-04-B M4-0.70 Brass
M934-05-50 M5-0.80 Standard
M934-06-60 M6-1.00 Standard
M934-06-64 M6-1.00 Std. (green)
M6923-06-80 M6-1.00 Spiralock
M982-06-80 M6-1.00 Elastic Stop
M934-08-60 M8-1.25 Standard
M6923-08-80 M8-1.25 Spiralock
M934-10-60 M10-1.50 Standard
M934-10-60F M10-1.25 Standard
M6923-10-80 M10-1.50 Spiralock
M6923-10-62 M10-1.50 Spiralock$
M934-12-60 M12-1.75 Standard
M934-12-60F M12-1.25 Standard
M6923-12-80 M12-1.75 Spiralock
M6923-16-80 M16-2.00 Spiralock
M934-18-80 M18-2.5 Standard
M934-20-80 M20-2.50 Standard
M934-22-60 M22-2.50 Standard
M934-24-80 M24-3.00 Standard
M934-30-80 M30-3.50 Standard
Washers
Bolt/
Part No. ID OD Thick. Screw
M125A-03-80 3.2 7.0 0.5 M3
M125A-04-80 4.3 9.0 0.8 M4
M125A-05-80 5.3 10.0 1.0 M5
M125A-06-80 6.4 12.0 1.6 M6
M125A-08-80 8.4 16.0 1.6 M8
M125A-10-80 10.5 20.0 2.0 M10
M125A-12-80 13.0 24.0 2.5 M12
M125A-14-80 15.0 28.0 2.5 M14
M125A-16-80 17.0 30.0 3.0 M16
M125A-18-80 19.0 34.0 3.0 M18
M125A-20-80 21.0 37.0 3.0 M20
M125A-24-80 25.0 44.0 4.0 M24
$ This metric hex nut’s hardness is grade 8.

KOHLER CO. Kohler, Wisconsin 53044
Phone 920-565-3381, Fax 920-459-1646
For the nearest sales/service outlet in the
US and Canada, phone 1-800-544-2444
KohlerPowerSystems.com
Kohler Power Systems
Asia Pacific Headquarters
TP-6053 7/04a 7 Jurong Pier Road
Singapore 619159
! 2000 and 2004 by Kohler Co. All rights reserved. Phone (65)6264-6422, Fax (65)6264-6455

TP6053 Catalago Kohler

Uploaded by

Copyright:

Available Formats

TP6053 Catalago Kohler

Uploaded by

Document Information

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

TP6053 Catalago Kohler

Uploaded by

Copyright:

Available Formats

Service

Marine Generator Sets

Safety Precautions and Instructions . . . . . . . . . I 6.3.2 High Water Temperature and

TP-6053 7/04 Table of Contents

IMPORTANT SAFETY Accidental Starting Battery electrolyte is a diluted

Battery acid cleanup. Battery acid

TP-6053 7/04 Safety Precautions and Instructions I

II Safety Precautions and Instructions TP-6053 7/04

TP-6053 7/04 Safety Precautions and Instructions III

IV Safety Precautions and Instructions TP-6053 7/04

WARNING Servicing the generator set when it

TP-6053 7/04 Safety Precautions and Instructions V

For professional advice on generator power China

TP-6053 7/04 Introduction i

Generator Set Identification Numbers

Accessory Number Accessory Description

ii Introduction TP-6053 7/04

1.1 General The 9EOZ/8EFOZ models are powered by a Yanmar

The 8EOZ/6.5EFOZ models are powered by a Yanmar

TP-6053 7/04 Section 1 Specifications 1

Figure 1-1 Generator Set Service View (5EOZ/4EFOZ)

2 Section 1 Specifications TP-6053 7/04

Figure 1-2 Generator Set Service View (8EOZ/6.5EFOZ)

TP-6053 7/04 Section 1 Specifications 3

Figure 1-3 Generator Set Service View (9/10EOZ and 8/9EFOZ)

4 Section 1 Specifications TP-6053 7/04

TP-6053 7/04 Section 1 Specifications 5

6 Section 1 Specifications TP-6053 7/04

Servicing the generator set when it is operating. Exposed 20W40

TP-6053 7/04 Section 2 Scheduled Maintenance 7

3. Activate the pump until all of the oil is removed.

4. Turn the valve at the base of the oil-drain hose to

8 Section 2 Scheduled Maintenance TP-6053 7/04

6. With a container at the exhaust outlet, run the

TP-6053 7/04 Section 2 Scheduled Maintenance 9

3.2 Exhaust System 3.3 Mixing Elbow

TP-6053 7/04 Section 3 Intake and Exhaust System 11

4.1 General 4.3 Fuel Filter

Spin-On Fuel Filter Replacement Procedure

3. Close the fuel supply valve.

5. Clean the contact surface of the fuel filter adapter.

8. Reconnect the generator set engine starting

ISO 8217 DMA, BS 2869 Part 1 Class

1. Fuel filter adapter

Figure 4-2 Spin-On Fuel Oil Filter

TP-6053 7/04 Section 4 Fuel System 13

2 Fuel System Bleeding Procedure

1. Loosen the fuel filter screw at position 1. See

3. Loosen the fuel filter screw at position 2.

5. Loosen the fuel injection pump screw at position 5.

6. Toggle the start/stop switch until fuel, free of air

1. Fuel strainer assembly 5. O-ring

Figure 4-3 Fuel Oil Filter Element

14 Section 4 Fuel System TP-6053 7/04

6 The generators in this manual use a 3-lead fuel

Current (amps) and resistance readings are shown in

4 Figure 4-5 Fuel Solenoid Readings

Figure 4-4 Fuel System Bleed Points, Typical

TP-6053 7/04 Section 4 Fuel System 15