Manual Mantenimiento Compresor QR25 Modelo 325
Manual Mantenimiento Compresor QR25 Modelo 325
Manual Mantenimiento Compresor QR25 Modelo 325
Step 14) Check for proper rotation of the cylinder cooling fan (fins inside
sheave). The fan should blow cooling air across the cylinder.
When using battery cables to start engine driven units do not use
CAUTION ! more than a total of 40 ft. of #4 gauge cable (GND & HOT).
With the pre-starting checklist completed and satisfied, start the compres-
sor. Watch and listen for excessive vibration and strange noises. If either exist,
stop the compressor. Refer to SECTION 6, Troubleshooting for help in
determining the cause of such problems.
If you are starting a pressure lubricated model, check the oil pressure.
Compressors producing up to 250 PSIG of discharge air pressure should
maintain 18 to 20 PSIG of oil pressure. High pressure rated compressors
producing more than 250 PSIG of discharge air pressure should maintain 22
to 25 PSIG of oil pressure.
Normally the oil pressure does not need to be adjusted. But if it does, loosen
the locknut on the adjustment screw located on the left side of the oil pump
housing (see Fig. 4-1, Oil Pressure Adjustment). Increase the oil pressure
by turning the adjustment screw clockwise; decrease the oil pressure by
turning the adjusting screw counterclockwise. After adjustment tighten the
locknut.
Check the air receiver pressure gauge or system pressure gauges for
proper readings. If inadequate or excessive air pressure conditions exist,
refer to Section 6 Troubleshooting.
Heat created during the initial startup of a new compressor will cause
slight expansion of the head(s). This slight expansion crushes the head
gasket ever so slightly and affects the torque value of the cylinder fasteners
(capscrews). To ensure optimal performance, Quincy recommends that you
Pix 1068 initially operate the compressor for at least one hour. Shut the compressor
Fig. 4-1
off and follow precautions outlined in SECTION 5, Stopping for Mainte-
Oil Pressure Adjustment
nance. Retorque the cylinder to head capscrews to the specifications
outlined in the parts book corresponding to the Record of Change for your
compressor after the compressor has cooled.
Observe compressor operation closely for the first hour of operation and
then frequently for the next seven hours. After the first eight hours, monitor
the compressor at least once every eight hours. If any abnormal conditions are
witnessed, stop the compressor and correct the problem. After two days of
operation check belt tension, lubricant level, and inspect the system for leaks.
QR-25 Series Quincy Compressor
Step 2) Drain liquid from the air receiver (refer to Section 3, Manually
Draining An Air Tank) and moisture trap (if so equipped).
Step 3) Jog the starter button and check compressor rotation. Note: Con-
tinuous Run Units - Prior to starting a continuous run unit, flip the
toggle lever on the pilot valve stem to the “MANUAL UNLOAD”
position (see below). Now the compressor can be started unloaded.
Once the compressor is running at full speed, flip the toggle back to
the “RUN” position.
"MANUAL "RUN"
UNLOAD" position
position
Fig. 4-2
Continuous Run Pilot Valve
Step 9) Check the lubricant level in the crankcase several minutes after
the compressor has run. (Discoloration or a higher lubricant level
reading may indicate the presence of condensed liquids.) If lubri-
cant is contaminated, drain and replace.
Step 2) Isolate the compressor from the compressed air supply by closing
a manual shutoff valve upstream and downstream from the com-
pressor. Display a sign in clear view at the shutoff valve stating
that the compressor is being serviced.
Step 3) Open a pressure relief valve within the pressurized system to allow
it to be completely de-pressurized. NEVER remove a plug to
relieve the pressure!
Step 4) Open all manual drain valves within the area to be serviced.
Step 5) Wait for the unit to cool before starting to service. (Temperatures
of 125°F can burn skin. Some surface temperatures exceed 350°F
when the compressor is operating.)
Maintenance Schedule
To assure maximum performance and service life of your compressor, a routine
maintenance schedule should be developed. A sample schedule has been
included here to help you to develop a maintenance schedule designed for your
particular application. Time frames may need to be shortened in harsher
environments.
Lubricant Specifications
(Use Quin-Cip lubricant.)
Ambient Temperature SAE Viscosity ISO Viscosity
Below 0°F SAE 5W ISO 22
0-32° F SAE 10W ISO 32
32-80°F SAE 20W ISO 68
60-104°F SAE 30 ISO 100
Periodically inspect the motor pulley(s) and compressor sheave(s) for oil,
grease, nicks or burrs. Clean or replace if necessary. Make sure they are
securely fastened. Align the compressor sheave with the motor or engine
pulley. Drive belt grooves of the pulley(s) and sheave(s) should be in line with
each other. The compressor crankshaft must be parallel to the motor or engine
drive shaft.
Step 1) Measure the span length of the drive. (Refer to Fig. 5-1, Setting
Belt Tension.)
Step 3) Lay a straightedge across the top outer surface of a drive belt from
pulley to sheave.
Step 4) At the center of the span, perpendicular to the belt, apply pressure
to the outer surface of the belt with a belt tension gauge (refer to
Fig. 5-2, Belt Tension Gauge). Force the belt to the predeter-
mined deflection (refer to Step 2 above). Record the reading on the
belt tension gauge and compare to the chart following Fig 5-1. The
deflection force reading should be within the minimum and maxi-
mum values shown. Adjust belt(s) accordingly. New belts should be
tensioned to the values listed under “Initial Install”.
Step 5) Recheck the tension of the new belts several times in the first 50
hours of operation and adjust if necessary. Thereafter, check belt
tension on a regular basis (refer to SECTION 5, Maintenance
Schedule).
Never exceed the designed pressure for the system or overload the
WARNING ! motor beyond its Maximum Amp Draw.
*Full load amps (FLA) & Service Factor can be found on the motor nameplate.
Step 4) Remove the countersunk pipe plug* from the oil pump housing and
relocate it in the opposite (bottom) hole. (See Fig. 5-6, Relocating
Countersunk Pipe Plug)
Failure to relocate this pipe plug will result in complete loss of oil flow
throughout the compressor. Compressor seizure will result and warranty
will be void. The countersunk pipe plug must always be relocated in the
CAUTION!
MAKE SURE THE FORKS OF THE BEARING bottom port position.
CARRIER DRIVESHAFT LINE UP PROPERLY
WITH THE PIN IN THE END OF THE
CRANKSHAFT DURING REASSEMBLY!
Step 5) Install a new oil filter*. Tighten the filter 1/2 turn after initial gasket
5120_31.TIF contact.
Fig. 5-5
Driveshaft Alignment Step 6) Re-assemble the control components in reverse order.
Step 8) For aircooled models only, remove the standard compressor sheave
OIL SUPPLY PORTS
TO THE OIL FILTER and replace with a reverse rotation sheave available from your
local Quincy Compressor distributor.
COUNTERSUNK
PIPE PLUG
Pix 1154
WARNING !
The pressure switch and / or pilot valve are set at the factory for maximum efficiency. Adjustments to either
component must be performed by a qualified technician. Exceeding the factory recommended maximum pressure
will void the warranty and may cause personal injury.
"MANUAL
Step 1. Flip the toggle to the UNLOAD"
"RUN" position as position
shown, or turn the (Ref.)
knurled knob (if so
equipped) counter-
clockwise until it
stops. Step 3. Turn clockwise to increase unload pres-
* sure, turn counterclockwise to decrease
Step 2. Loosen locknut unload pressure. Hold position with
(counterclockwise). * wrench and proceed to Step 4.
Stabilize with Step 4. Tighten locknut (clockwise) with wrench.
back-up wrench! * Stabilize with back-up wrench!
Water in the crankcase •Compressor does not run long enough to get hot and vaporize the liquids
(lubricant appears milky) squeezed out of the air during compression (compressor may be too large
for application)
•Incorrect or inferior grade of lubricant
•System pressure leaking back through discharge valve
Defective pressure switch •Moisture &/or oil buildup on the pressure switch diaphragm
•Ruptured diaphragm
•Burned contact points
•Plugged air passage from the receiver to the pressure switch
•Loose electrical connection
Intercooler pressure •Compressor valves or valve unloaders in first stage not functioning
abnormally low properly or defective
(Two stage models only) •Restricted air inlet filter or suction line
•Pilot valve or pressure switch set incorrectly or defective
•Pressurized air at valve unloader not venting properly when demand for
air is required; vent passage at hydraulic unloader or three-way valve
could be plugged
•Compressor valve or head gasket leaking
•Worn piston rings
•Defective pressure gauge
•Leaking air at intercooler or intercooler connections
Excessive current draw •Low voltage (must be within 10% of nameplate voltage)
(To determine maximum •Loose electrical connection
amperage allowed, multiply •Wire size too small
the FLA on the motor •Incorrect lubricant
nameplate by the service •Discharge pressure too high
factor.) •Intercooler plugging
CAUTION ! •Bearings tight or seizing
Motor surface temperature •No crankshaft endplay
normally exceeds 170° F. •Motor sized incorrectly
•Motor defective
•Drive belts too tight