966G ®

Series II
Wheel Loader

Engine
Engine Model Caterpillar® 3176C with ATAAC
Flywheel Power 184 kW 246 hp
Max. Flywheel Power 194 kW 260 hp
Weights
Operating Weight 22 870 kg 50,400 lb
Buckets
Bucket Capacities 3.5-4.25 m3 (4.5-5.5 yd3)

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 966G Series II Wheel Loader
Setting the standard for wheel loader productivity, durability, and operator comfort.

Engine Electronic Transmission Cooling System

®
✔ Cat 3176C ATAAC diesel engine Planetary power shift transmission ✔ The G Series II cooling package reduces
is built for performance, durability, with automatic shift capability provides radiator plugging and contributes to
excellent fuel economy, low sound on-the-go speed and direction changes. increased fuel efficiency. The new
levels, and meets all world-wide The Electronic Clutch Pressure Control cooling package traps less airborne
emission regulations through 2005. (ECPC) delivers smoother shifts. debris and is more accessible for
pg. 4 Variable Shift Control matches shift cleaning. pg. 6
patterns to the application. pg. 5

Versatility and Application Match Environmental Features

✔ Choose from a wide variety of Caterpillar ✔ The 966G Series II is designed and
buckets, ground engaging tools, work built with the environment in mind
tools, and special arrangements to match with features including the new
your application. pg. 12 3176C electronic engine, electronically
controlled on-demand fan, ecology
drains, environmental fluids, and
recyclable and remanufacturable
components. pg. 14

Performance and comfort you can feel,

delivering strong breakout force, fast
cycle times, and smooth shifts for
optimal performance and comfort.

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Axles Operator Station: Operator Station:
Conventional Steering Wheel Command Control Steering
Caterpillar designed and built with
proven durability, the heavy-duty, Conventional steering wheel with pilot Command control steering with
four-piece axle design continues with hydraulic controls is one of two operator electro-hydraulic controls features
the G Series providing maximum station options. The 966G Series II cab a semicircular steering wheel with
performance and serviceability. pg. 7 is ergonomically designed and sets the integrated transmission controls.
industry standard for operator comfort The cab is ergonomically designed
and efficiency. pg. 8 and sets the industry standard for
operator comfort and efficiency.
pg. 10

Complete Customer Support Serviceability

In addition to machine selection, Cat The 966G Series II leads the pack in
dealers offer a wide range of services, serviceability with extended service
from purchase options to operator intervals; ground-level access to all
training, maintenance programs and major service points; sight gauges for
parts support. pg. 15 fluid level checks of engine coolant,
hydraulic oil, and transmission oil;
convenient system access; and
performance feedback via the
Caterpillar Monitoring System.
pg. 16

✔ New Feature

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Engine
The 966G Series II engine is built for power and reliability to deliver excellent productivity
and cost effective operation.

Caterpillar Monitoring System (CMS).

CMS monitors six major engine system
functions and derates the engine should
any critical conditions occur. Timely
information allows operators to better
manage machine operation and take
necessary corrective actions, lessening
the risk of potential machine damage.
Turbocharged and ATAAC. Turbo-
charging packs dense air into the
cylinders for more complete combustion
and lower emissions. Air-to-air after-
cooler (ATAAC) reduces smoke and
emissions by providing cooler inlet
air for more efficient combustion.
The result is high output and efficiency
while meeting EPA Tier 2 emissions
compliance.
Constant Net Horsepower. The 3176C
electronic engine continuously gathers
information to control the on-demand
fan speed and provide constant net
horsepower regardless of operating
conditions. Compensating for varying
fan loads enables the machine to
maintain normal system temperatures
and reduce fuel consumption.
Less Maintenance. With the 3176C, the
engine oil change interval is increased
from 250 to 500 hours with the use
Powerful Performance. The 3176C high Advanced Fuel System. The 966G II
of CH-4 oil, after an initial 250 hour
performance electronically controlled features a Caterpillar exclusive
oil change, to provide reduced costs
diesel engine - with six-cylinder, direct Advanced Diesel Engine Module
and downtime.
injection, turbo-charged, air-to-air after- (ADEM III) fuel system controller.
cooled (ATAAC), and 4-valves per ADEM III controls all major engine
cylinder - delivers net power of 184 kW functions, regulates the timing,
(246 hp) and enables the 966G II to duration, and pressure of the fuel
perform in the most demanding of injection, providing this information
applications. The 3176C is the ultimate to the Caterpillar Monitoring System.
combination of Caterpillar diesel and
electronic component technology
including ADEM™ III, Caterpillar
Monitoring System, and ATAAC
resulting in unmatched productivity
and efficiency.

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Electronic Transmission
Advanced Caterpillar power train is reliable and fuel efficient.

Electronic Power Shift Transmission.

The planetary power shift transmission
with automatic shift capability is designed
and built by Caterpillar. The planetary
design results in more gear tooth contact
for transmitting loads and durability.
This robust transmission allows full
power, speed, and directional changes.
Electronic Clutch Pressure Control
(ECPC). Input from both the transmission
and the operator controls in the cab
modulate each individual clutch through
a proportional electro-hydraulic valve.
Six proportional electro-hydraulic
valves pressurizing the clutches are
identical and are bolted on top of the
transmission. This results in smoother
speed and directional shifts. Energy is
modulated in the clutches, resulting in
longer component life.
Integrated Braking System (IBS).
The Caterpillar exclusive IBS integrates
downshifting and neutralizer logic into
the left-hand brake pedal. IBS increases
performance and productivity with an
optimized transmission neutralizer and
automatic downshifting. IBS also lowers
owning and operating costs by reducing
axle oil temperatures to extend brake life.
Free Wheel Stator Torque Converter Variable Shift Control (VSC). VSC Easy Service. Daily oil level check is
(FWSTC). FWSTC reduces drags in the transmission software allows the done from the ground through a well-
torque converter at high turbine speed/ operator to select three different shift protected sight gauge. An oil sampling
impeller speed ratios. This improves patterns based on the application and valve allows quick, clean access to the
machine power train efficiency and operating preferences. This feature transmission for S•O•SSM oil analysis.
contributes to improved fuel economy reduces fuel consumption in certain
in certain applications. Ecology Drain. A transmission oil ecology
applications. In all modes, full
drain is standard and allows oil to be
machine power remains available
drained without spillage.
for production loading.

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Cooling System
The 966G Series II cooling package provides reduced radiator plugging, fuel efficiency, and
easy maintenance.

Convenient System Access. The 966G II

offers both a swing-out grill and swing-out
hydraulic oil cooler and air conditioner
condenser for fast and easy cleaning.
Left and right side panels also allow
access to cores for cleaning.
Airborne Debris Grill (Optional).
An optional attachment, the airborne
debris grill replaces the standard rear
grill with one that has a vertically
corrugated steel screen with 4 mm
(0.16") perforations to restrict the
entry of airborne debris. The grill is
hinged to allow access to cooler cores
for cleaning, and also includes brackets
Reversed Airflow, Unit Core Radiator. Electronically Controlled On-Demand to seal around the fuel tank and screen
The airflow is reversed on the 966G II Fan. Electronically controlled, material between the bottom of the grill
and enters through the rear grill, exits temperature sensing variable speed and the counterweight.
out the top and side hood panels. on-demand fan adjusts to meet the
Reversed air flow means less debris varying cooling requirements of the
entering the system. In addition, a new machine throughout the work cycle.
unit core radiator with square wave Hydraulic oil, engine coolant, and inlet
shaped fins and lower fin density (6 fins manifold temperatures determine fan
per inch) allows debris to pass through speed. In cooler operating conditions,
more easily. average fan speed is reduced, resulting
in less fuel consumption and lower
noise levels. Lower air flow also
reduces cooler core plugging in
high airborne debris applications.

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Axles
Heavy-duty axles protect internal components from the environment and offer excellent
serviceability.

Heavy-Duty, Four-Piece Axle Design. Integrated Axle Diagnostics. Solutions For Extreme Applications.
Caterpillar designed and built with The left-hand pedal serves as either
1. Brake wear indicators (2 per axle)
proven durability, the 966G four- an additional brake or, when activated,
provide easy access to measure brake
piece axle design is maintained for the engages Caterpillar’s exclusive Integrated
disc wear without disassembling the
966G Series II. Designed to last in all Braking System (IBS). IBS reduces axle
axle. The original brake reading is
operating conditions, each axle contains oil temperatures to provide maximum
recorded in the machine controls at
two axle shaft housings, the center axle component life. Although IBS
the factory to allow precise wear
housing, and the intermediate housing. reduces the need for axle oil coolers
calculations.
The front axle is fixed, and the rear in many cases, an internal axle oil
axle oscillates ±13 degrees. 2. Axle oil temperature sensors in cooler is available as a factory
both front and rear axles alert installed attachment.
Fully Hydraulic Service Brake.
the operator on the Caterpillar
Inboard brakes are positioned next to Limited Slip Differentials (Optional).
Monitoring System panel of
the differential operating on the low Available for front and/or rear axles,
increased axle oil temperatures to
torque side of the final drive. Four limited slip differentials deliver
allow the operator to modify the
friction discs, two each side, are fully maximum traction on uneven ground
operating technique. This ensures
enclosed within each axle to lock out and in changing traction conditions
optimum axle operating conditions
contaminants. Multiple oil-disc brakes such as mud, water, snow, and ice.
for maximum component life.
are adjustment free, and bathed in axle
Axle Oil Ecology Drains (Optional).
oil for excellent cooling. Independent
Axle oil ecology drains provide easier
front and rear brake circuits use separate,
drainage with fewer spills.
heavy-duty piston-type accumulators to
ensure dead engine braking.

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Operator Station: Conventional Steering Wheel
The 966G II cab offers unmatched operator comfort and efficiency with steering and control
options to fit every operator and application.

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Conventional Steering Wheel (SW) with Pilot Hydraulic Bucket Controls

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1 Conventional Steering Wheel (SW). 6 Seat Options. The KAB cloth, 13 Transmission Neutralizer Override
With a standard hand-grip feature, the mechanical suspension seat is standard Switch. A rocker switch activates the
SW configuration offers a low effort on the SW machine. Caterpillar Comfort override so the left pedal will not
hand metering unit hydraulic steering cloth air suspension seat is available as neutralize (or disengage) the transmission,
system. Load sensing steering directs an attachment. but will function only as a service brake.
power through the steering system only Upon engine start-up, the neutralizer
7 Entry/Exit With Standard Sliding
when needed. When not steering, more will default to the active position.
Windows. Rear-hinged, full-length
engine power is available to generate
doors with left side ground level 14 Ride Control System (Optional).
rimpull, breakout force, lift force, and
access and standard sliding windows. Ride control provides a smoother,
results in reduced fuel consumption.
more comfortable ride, and contributes
The steering column tilts for maximum 8 Visibility. A wider, flat front and
to increased frame and machine life by
operator comfort. distortion-free windshield features
reducing shock loads on the structures.
bonded glass to reduce obstructions and
2 Shift Lever. SW machines are equipped
provide an accurate and full view of the 15 Payload Control System (PCS;
with a lever on the left side of the
entire working area. Windshield wiper Optional). PCS allows on-the-go
steering column for directional and
sweep is increased and wet-arm, front and weighing of the bucket payload
speed selection.
back wiper washers ensure a clear view during the lift cycle.
3 Pilot Hydraulic Bucket Controls. is maintained. A larger roof improves
Radio-Ready. Includes standard 12V
Pilot-assisted, hydraulic bucket controls water run-off, and a stylish sloping
(10 amp) converter, speakers, antenna,
make low-effort operation possible. hood provides excellent rear visibility.
wiring and brackets for an entertainment
Individual lift and tilt levers are standard
9 Generous Storage. Larger radio. Entertainment radio is available
as shown. One lift and one return-to-dig
compartments for lunchbox, cooler, as a factory installed attachment. A CB
position may be adjusted on the linkage.
cups, and storage. radio-ready option is also available as
A downshift switch is located on the
an attachment and includes all wiring
lift lever for use in bucket loading. 10 Caterpillar Monitoring System
and hardware plus a 20-amp 24V to
A single lever joystick is available as (CMS). CMS monitors critical machine
12V converter.
an attachment. Forward/Neutral/Reverse systems and provides four warning
(F-N-R) switch on the lift lever is categories to keep the operator informed. Floor Mat. Enhanced with contours
available as an attachment on either CMS is conveniently located on the to allow for easier cleaning.
lever arrangement. upper control module. LED indicators
eliminate the need for bulb replacement.
4 Standard Air Conditioning and
Improved Ventilation. Air conditioning, 11 Electronic Autoshift Control. The
heating, and defrosting functions are operator can choose manual or automatic
standard and airflow is improved transmission shifting. Pilot controls
utilizing thirteen louvered vents and a allow two automatic shift positions.
larger re-circulation filter. This ensures
12 Variable Shift Control (VSC). VSC
better air quality for the operator. All
is a standard system that allows the
controls are located on the upper control
operator to select 3 different shifting
panel within easy reach of the operator.
patterns to best match the application
5 Dual-Pedal Braking. The left-hand requirements and provide fuel efficiency,
pedal serves as either an additional smoother shifts, and reduced sound
brake or, when activated, engages the levels. VSC rotary switch is located
Caterpillar exclusive Integrated Braking on the upper right control panel.
System (IBS). IBS integrates both
downshifting, transmission neutralizer
logic, and braking into the left-hand
pedal. Using the neutralizer maintains
high engine RPM for full hydraulic flow.

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Operator Station: Command Control Steering
The 966G II cab offers unmatched operator comfort and efficiency with steering and control
options to fit every operator and application.

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Command Control Steering with Electro-Hydraulic Bucket Controls

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1 Command Control Steering (CC). 5 Standard Air Conditioning and 12 Variable Shift Control (VSC). VSC
A pilot operated, load-sensing system, Improved Ventilation. Air conditioning, is a system that allows the operator to
CC links the steering wheel and frame heating, defrosting functions are select 3 different shifting patterns to
angle positions to provide the proper standard and airflow is improved best match the application requirements
amount of steering control with minimal utilizing thirteen louvered vents and a and provide fuel efficiency, smoother
operator effort. The speed the machine larger re-circulation filter. This ensures shifts, and reduced sound levels. VSC
turns is proportional to the steering wheel better air quality for the operator. All rotary switch is located on the upper
position. Steering stops are hydraulically controls are located on the upper control right control panel.
cushioned. Benefits of this system are panel within easy reach of the operator.
13 Transmission Neutralizer Override
precise control, quick response, and
6 Dual-Pedal Braking. The left-hand Switch. A rocker switch activates
reduced operator fatigue. The unique
pedal serves as either an additional the override so the left pedal will
semicircular steering wheel shape
brake or, when activated, engages the not neutralize (or disengage) the
provides improved visibility to the
Caterpillar exclusive Integrated Braking transmission, but will function only as
front dash and gauges. The steering
System (IBS). IBS integrates both a service brake. Upon engine start-up,
column tilts and telescopes to adjust
downshifting, transmission neutralizer the neutralizer will default to the
for maximum operator comfort.
logic, and braking into the left-hand active position.
2 Ergonomic Transmission Controls. pedal. Using the neutralizer maintains
14 Ride Control System (Optional).
CC transmission controls are high engine RPM for full hydraulic flow.
Ride control provides a smoother,
ergonomically integrated onto the
7 Entry/Exit With Standard Sliding more comfortable ride, and contributes
steering grip to allow one hand steering
Windows. Rear-hinged, full-length to increased frame and machine life by
and shifting. Controls include a three-
doors with left side ground level reducing shock loads into the structures.
position rocker switch to select forward,
access and standard sliding windows.
neutral, or reverse and a thumb operated Radio-Ready. Includes standard 12V
up-shift and downshift button for 8 Visibility. A wider, flat front and (10 amp) converter, speakers, antenna,
optional manual shift mode. distortion-free windshield features wiring and brackets for an entertainment
bonded glass to reduce obstructions and radio. Entertainment radio is available
3 Standard Air Suspension Seat.
provide an accurate and full view of the as a factory installed attachment. A CB
Caterpillar Comfort cloth, air
entire working area. Windshield wiper radio-ready option is also available as
suspension seat with six adjustments
sweep is increased and wet-arm, front and an attachment and includes all wiring
and lumbar support is standard on the
back wiper washers ensure a clear view and hardware plus a 20-amp 24V to
CC configuration.
is maintained. A larger roof improves 12V converter.
4 Electro-Hydraulic (E/H) Bucket water run-off, and a stylish sloping
Floor Mat. Enhanced with contours
Controls. E/H offers “finger-tip” hood provides excellent rear visibility.
to provide for easier cleaning.
movement lift and tilt bucket controls
9 Generous Storage Area. Larger
with outstanding sensitivity and control.
compartments for lunchbox, cooler,
Automatic lift and tilt kick-outs are
cups, and storage.
adjustable from inside the cab and are
hydraulically cushioned for greater 10 Caterpillar Monitoring System
operator comfort and less material (CMS). CMS monitors critical machine
spillage. Enhancements to this system systems and provides four warning
with the 966G II include “bucket categories to keep the operator informed.
dump rate control” for smooth flow CMS is conveniently located on the
of material from the bucket and “fine upper control module. LED indicators
modulation control” to provide precise eliminate the need for bulb replacement.
control for delicate bucket or work
11 Electronic Autoshift Control.
tool operations.
The operator can choose manual
or automatic transmission shifting.
E/H controls allow four automatic
shift positions.

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Versatility and Application Match
The 966G Series II is built for versatility and Caterpillar offers a wide variety of tools and
special arrangements to match the job for maximum productivity.

Quick Coupler Pallet Fork

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Waste Bucket Millyard Fork

General Purpose (GP) Buckets. Caterpillar Ground Engaging Tools. Heavy-Duty Rock Buckets. Ideal for
Designed and built to Caterpillar G.E.T. options include: quarry and mining applications, standard
specifications, GP buckets perform and heavy-duty rock buckets with
1 Bolt-on Cutting Edge. Reversible,
well in a broad range of applications various G.E.T. options are available.
with superior strength. Heavy-duty
including excavation, stockpiling, and
edges are also available and provide Quick Coupler and Specialty Work
dozing. GP buckets are available in
50% more wear life. Tools. A quick coupler and a wide
various sizes for either pin-on or quick
variety of specialty buckets and work
coupler and can accept bolt-on edges, 2 Bolt-on Center and Corner Adapters.
tools are available through either the
teeth, or teeth and segments.
3 Tips. Five tip options are available to factory or Caterpillar Work Tools &
Material Handling (MH) Buckets. provide the best combination of wear Solutions (CWTS). Specialized work
Designed and built to Caterpillar life, penetration, and strength required tool options include pallet forks, lumber
specifications, MH buckets maximize for each application. and log forks, millyard forks, waste
performance in free-flowing material, buckets, plows, material handling arms,
4 Segments. Heavy-duty, reversible
as found in many stockpile applications. side-dump buckets, coal buckets, and
segments protect the cutting edge,
MH buckets are available in various woodchip buckets.
eliminating scalloping and maintaining
sizes and can accept bolt-on edges,
a smooth work surface. High Lift Arrangement (Optional).
teeth, or teeth and segments.
Provides an additional 559 mm (22")
of lift height over standard linkage for
additional dump clearance. Arrangement
includes extended lift arms, tilt cylinder,
and additional counterweight.

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Waste Handler Arrangement (Optional).
This arrangement provides additional
guarding and features for machines
used in waste transfer stations, waste to
energy plants, recycling stations, and
compost refuse processing. It offers the
972G II heavy duty front frame, axle
seal guards, narrow steel front fenders,
headlight and tail light guards, hinged
and electronically actuated power train
guard, front frame bottom guard,
hydraulic tank guard, fuel tank guard,
steering cylinder guards, and a heavy
duty ladder with steel cable step.
Options available with this arrangement
include: (1) auto-reversing fan, to
automatically reverse on a timed
cycle or by manual activation to easily
purge debris from the radiator; (2) roof
mounted air conditioning; (3) Sy-Klone
air intake precleaner with trash screen; and
(4) Caterpillar Work Tools waste bucket.
Forest Machine Arrangement (Optional).
Coupled with a variety of Caterpillar
work tools including logging and millyard
forks, woodchip buckets, pallet forks,
and an optional quick coupler, the
966G II forest arrangement is designed
to handle a wide variety of millyard
jobs. Forest arrangement offers the
Aggregates Autodig (Optional, CC/EH Payload Control System (PCS; Optional).
972G II heavy duty front frame, third
only). Designed primarily to benefit Enhanced for the G Series II, PCS allows
valve hydraulics, larger tilt cylinder,
stockpile operations, Aggregates Autodig on-the-go weighing of the bucket payload
and additional counterweight for better
controls the lift and tilt functions during during the lift cycle with an accuracy of
load control and higher static tipping
the loading cycle, while the operator ±1.5% (±1% for stationary machine).
load for greater payload.
maintains control of steering, direction, PCS records date, time, weight, number
Corrosion Resistant Paint (Optional). and throttle. The ability to fully load of passes (up to 2,639 truckloads) with
Provides a triple coat paint process, a bucket with a consistent load time download capability.
two coats of primer, and a final finish provides reduced operator fatigue
coat. Silicon sealant is applied to all and a constant level of productivity
exposed electrical wire terminals and throughout the workday.
connections to help protect them from
corrosive atmospheres.

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Environmental Features
Caterpillar cares for the environment and continues to develop innovative solutions.

Fewer Leaks and Spills. Oil sampling

valves and pressure test ports for service
diagnostics are standard and reduce the
chance of spills. Engine, transmission,
and hydraulic oil ecology drains are
standard with the 966G II and allow
fluids to be easily drained into a
container without spillage. Axle oil
ecology drains are also offered as an
optional attachment.
Environmental Fluids. Extended life
engine coolant with anti-foaming and
anti-corrosive properties provides
extended service intervals up to
6,000 hours for fewer fluid disposals.
The air conditioning coolant is CFC-
free. A biodegradable oil that meets
Caterpillar’s BF-1 specification can
be used in the hydraulic system.
Recyclable and Remanufacturable
Components. Designed with recyclability
in mind, the 966G II is comprised
of recyclable materials including cast
iron, steel, plastic, glass, and rubber.
In addition, many large components are
designed for rebuilding to help reduce
waste in the environment and provide
cost savings to the customer.

Low Exhaust Emissions, Fewer Oil Reduced Fuel Consumption and Noise.
Changes. The electronically controlled Electronically controlled, variable speed
engine adjusts the fuel-to-air ratio and on-demand fan adjusts to meet the
the ATAAC provides more efficient varying cooling requirements of the
combustion, lower fuel consumption, machine throughout the work cycle.
and cleaner emissions. The 966G II Hydraulics oil, engine oil, coolant, and
meets all EPA Tier 2 requirements air inlet temperatures determine fan
without sacrificing any expected speed. In cooler operating conditions,
Caterpillar performance. In addition, average fan speed is reduced, resulting
engine oil change intervals are extended in less fuel consumption and lower
to every 500 hours, after an initial noise levels.
250 hour oil change, helping to
conserve natural resources.

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Complete Customer Support
Cat dealer services help you operate longer with lower costs.

Machine Selection. Cat dealers can

help make detailed comparisons of the
machines under consideration before
purchase. It is important to compare
machine specifications, standard
equipment, and attachment options.
In addition, Cat dealers can estimate
component life, preventative maintenance
cost, and the true costs of lost production.
Purchase. Beyond initial price,
Cat dealers can explain all available
financing options as well as day-to-day
operating costs. They can offer dealer
services that can be included in the
cost of the machine to yield lower
equipment owning and operating
costs over the long term.
Customer Support Agreements.
Cat dealers offer a variety of product
support agreements and will work with
customers to develop a service plan that
best meets each customer’s specific
needs. Service plans can cover the
entire machine, including attachments,
to help protect each customer’s
investment.
Product Support. Cat dealers have
nearly all parts available at their dealer
parts counters. They utilize a worldwide
computer network to locate in-stock Maintenance Services. Cat dealers Replacement. Repair, rebuild or replace?
parts, resulting in minimized machine offer a variety of maintenance services Cat dealers can help you evaluate the
downtime. Genuine Cat Reman parts that can be included with the initial cost involved to make the right choice.
are available as an option to new machine purchase. Repair option
components and offer the customer programs guarantee the cost of repairs
cost savings and a warranty with up front. Diagnostic programs such as
equal reliability. S•O•S, coolant sampling, and technical
Operation. Cat dealers can provide analysis help avoid unscheduled repairs.
training media and operating techniques
to assist owners and operators in
increasing productivity, which in
turn increases profitability.

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Serviceability
The 966G Series II continues Caterpillar leadership in wheel loader serviceability.

Caterpillar Monitoring System (CMS).

CMS provides a wealth of machine
operation and performance feedback,
along with diagnostic codes, which a
service technician can use to quickly
troubleshoot problems. A warning
system provides the operator four
categories or levels of warning,
depending on the severity.

Easy Access. Engine oil fill and

dipstick are conveniently accessed
through a lockable ground level service
door located on the right side of the
hood. Swing-out cooling and air
conditioning cores allow for quick
service and cleaning. The non-metallic
Reduced Maintenance. Caterpillar Extended Fluid Change Intervals. hood tilts electrically with an electric
radial seal filters provide efficient The 3176C extends engine oil change screw-jack, located in the tool box on
filtration, extended filter life, and do intervals from 250 to 500 hours with the the right rear frame. Hood tilts up to
not require tools to service, resulting use of CH-4 oil, after an initial 250 hour 70 degrees for full access to engine,
in less maintenance time and lower oil change. The coolant system is cooling system, and major components.
operating costs. factory filled with Caterpillar extended The cab can also be easily removed
life coolant, which can provide up to from the machine in about 45 minutes.
6,000 hours between change intervals. Brake Wear Indicators. A standard
feature allowing a service technician
to measure and track brake wear.

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Maintenance-Free 950 CCA Batteries.
Two maintenance-free batteries are
located in a lockable battery box on the
left rear frame, sealed to prevent moisture.
Ground Level Maintenance Points.
Remote grease lines are located in the
hitch area in two convenient lube banks
on the left side of the machine. U-joints
are lifetime lubricated. The slip joint is
the only driveline component requiring
lubrication.
Convenient Sight Gauges. Transmission
oil, hydraulic oil, and radiator coolant
sight gauges are conveniently located
and visible from ground level.
Caterpillar Product Link 201 (Optional).
Product Link 201 is a wireless system
using satellite technology and the
internet to provide up-to-date machine
location, service meter hours, and
machine health monitoring. Product Link
simplifies maintenance scheduling, fleet
management, unauthorized machine
usage or movement, and product problem
event tracking and diagnosis. Product
Link is available installed from the
factory or can be added in the field.
Remote Pressure Taps (Optional).
Remote pressure taps provide easy
access to diagnostic pressure taps Automated Lubrication System Maintaining proper grease lubrication
for transmission, torque converter, (Optional). Available as a factory on working surfaces significantly
implement pumps. and steering (with installed attachment, this system extends component life.
conventional SW arrangement). provides precise lubrication on pins
and bushings at preset timed intervals
while the machine is in operation.

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Engine Buckets

Engine Model Caterpillar 3176C with Bucket Capacities 3.5-4.25 m3 (4.5-5.5 yd3)
ATAAC
Flywheel Power 184 kW 246 hp
Max. Flywheel Power 194 kW 260 hp Transmission
Flywheel Power - ISO 9249 193 kW 259 hp
Flywheel Power - EEC 80/1269 193 kW 259 hp Forward 1 7.2 kph 4.5 mph
Peak Torque (Net) @ 1,200 RPM 1215 N•m 896 ft-lb Forward 2 12.6 kph 7.8 mph
Total Torque Rise 49% Forward 3 21.7 kph 13.5 mph
Bore 125 mm 4.9 in Forward 4 37.2 kph 23.1 mph
Stroke 140 mm 5.5 in Reverse 1 8.2 kph 5.1 mph
Displacement 10.3 L 629 in3 Reverse 2 14.3 kph 8.9 mph
Reverse 3 24.6 kph 15.3 mph
• These ratings apply at 2150 rpm when tested under the
specified standard conditions for the specified standard. Reverse 4 38.5 kph 23.9 mph

• Power rating conditions for flywheel power advertised • Maximum travel speeds (standard 26.5-R25 XHA L-3 tires)
is the power available when the engine is equipped with
alternator, air cleaner, muffler and on-demand hydraulic
fan drive at maximum fan speed. Hydraulic System
• No derating required up to 3600 m (11,811 ft) altitude.
Bucket/Work Tool System - 375 L/min 99 gal/min
• The 3176C meets the following emission requirements:
Pump Output
EU Stage II, US EPA Tier 2, and Japan MOC.
Bucket/Work Tool System - 20 700 kPa 3,000 psi
Relief Valve Setting
Hydraulic Cycle Time - Raise 6.9 Seconds
896 lb-ft 1215 N•m
Hydraulic Cycle Time - Dump 1.4 Seconds
1100 Hydraulic Cycle Time - 1.8 Seconds
Lower, Empty, Float Down
740 1000
Hydraulic Cycle Time - Total 10.1 Seconds
Engine Torque
Engine Torque

(N•m)
(lb-ft)

900 Pilot System - Pump Output 46 L/min 12 gal/min

Pilot System - Working 2585 kPa 375 psi
580 800
Pressure - Pilot
700 Pilot System - Working 3450 kPa 500 psi
Pressure - E/H
440 600
• Bucket/Work Tool System, Vane-Type Pump - Rated at
Working
Range 2111 rpm and 6900 kPa (1,000 psi).
260 hp 194 kW
190 maximum
246 hp 184 kW
180 at 2150 rpm
Brakes
170
Engine Power
Engine Power

Brakes Meets required

(kW)

standards.
(hp)

120 160

150 • Meets the following standard: ISO 3450-1996.

105 140

130
Axles
1000 1200 1400 1600 1800 2000 2200 Front Fixed front
Engine rpm Rear Oscillating ±13°
Maximum Single-Wheel 502 mm 19.8 in
Rise and Fall
Weights

Operating Weight 22 870 kg 50,400 lb

18 966G Series II Wheel Loader specifications

Courtesy of Machine.Market
Cab Service Refill Capacities

ROPS/FOPS Meets SAE and ISO Fuel Tank - Standard 380 L 100.4 gal
standards Cooling System 80 L 21 gal
• Caterpillar cab with integrated Rollover Protective Structure Crankcase 35 L 9 gal
(ROPS) are standard in North America and Europe. Transmission 50 L 13 gal
• ROPS meets SAE J1040 APR88 and ISO 3471:1994 criteria. Differentials and Final Drives 64 L 17 gal
• Falling Objects Protective Structure (FOPS) meets SAE J231 - Front
JAN81 and ISO 3449:1992 Level II criteria. Differentials and Final Drives 64 L 17 gal
- Rear
• The operator sound pressure level measured according to
the procedures specified in ISO 6394:1998 is 75 dB(A) for Hydraulic System 207 L 55 gal
the cab offered by Caterpillar, when properly installed and (Including Tank)
maintained and tested with the doors and windows closed. Hydraulic Tank 140 L 37 gal
• Hearing protection may be needed when operating with
an open operator station and cab (when not properly
maintained or doors/windows open) for extended periods
or in noisy environment.
• The sound pressure level is 112 dB(A) measured according
to the static test procedure and conditions specified in
ISO 6393:1998 for a standard machine configuration.

966G Series II Wheel Loader specifications 19

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Operation Specifications
General Purpose Buckets

Teeth Teeth Teeth

Bolt-on and Bolt-on and Bolt-on and
edges segments Teeth edges segments Teeth edges segments Teeth

Rated capacity m3 4.25 4.25 4.0 4.0 4.0 3.8 3.8 3.8 3.65
yd3 5.5 5.5 5.25 5.25 5.25 5.0 5.0 5. 0 4.75
Struck capacity m3 3.62 3.62 3.43 3.43 3.43 3.28 3.27 3.27 3.12
yd3 4.7 4.7 4.46 4.46 4.46 4.27 4.25 4.25 4.06
Width mm 3220 3311 3311 3059 3150 3150 3059 3150 3150
ft/in 10'6" 10'10" 10'10" 10'0" 10'4" 10'4" 10'0" 10'4" 10'4"
Dump clearance at full lift mm 3066 2929 2929 3066 2929 2929 3100 2963 2963
and 45° discharge ft/in 10'0" 9'7" 9'7" 10'0" 9'7" 9'7" 10'2" 9'8" 9'8"
Reach at full lift mm 1328 1449 1449 1328 1449 1449 1304 1426 1426
and 45° discharge ft/in 4'4" 4'9" 4'9" 4'4" 4'9" 4'9" 4'3" 4'8" 4'8"
Reach with lift arms mm 2736 2917 2917 2736 2917 2917 2694 2875 2875
horizontal and bucket level ft/in 8'11" 9'6" 9'6" 8'11" 9'6" 9'6" 8'10" 9'5" 9'5"
Digging depth mm 129 129 99 129 129 99 129 129 99
in 5.0" 5.0" 3.8" 5.0" 5.0" 3.8" 5.0" 5.0" 3.8"
Overall length mm 8870 9073 9073 8870 9073 9073 8828 9031 9031
ft/in 29'1" 29'9" 29'9" 29'1" 29'9" 29'9" 28'11" 29'7" 29'7"
Overall height with bucket mm 5832 5832 5832 5832 5832 5832 5794 5794 5794
at full raise ft/in 19'1" 19'1" 19'1" 19'1" 19'1" 19'1" 19'0" 19'0" 19'0"
Loader clearance circle with mm 14 726 14 923 14 923 14 578 14 776 14 776 14 557 14 754 14 754
bucket in carry position ft/in 48'3" 48'11" 48'11" 47'9" 48'5" 48'5" 47'9" 48'4" 48'4"
Static tipping load, straight** kg 16 280 16 110 16 270 16 350 16 180 16 470 16 310 16 140 16 440
lb 35,881 35,506 35,859 36,035 35,661 36,300 35,947 35,573 36,234
Static tipping load, kg 14 470 14 310 14 460 14 540 14 380 14 650 14 500 14 330 14 610
articulated at full 37° turn lb 31,892 31,539 31,870 32,046 31,694 32,289 31,958 31,583 32,200
Breakout force*** kN 189.1 187.9 201.1 189.4 188.3 201.5 196.7 195.6 209.6
lb 42,477 42,221 45,184 42,562 42,306 45,260 44,189 43,940 47,092
Operating weight** kg 22 868 23 041 22 875 22 794 22 967 22 813 22 748 22 921 22 767
lb 50,401 50,782 50,417 50,238 50,619 50,280 50,137 50,518 50,178

Standard Lift
Bucket Selection Guide/Material Density
1400 1600 1800 2000 2200 kg/m3
yd3 m3
4.50 3.50

4.75 3.65

5.00 3.80

5.25 4.00

5.50 4.25

2250 2500 2750 3000 3250 3500 3750 lb/yd3

% = Bucket Fill Factor

115% 100% 95%

20 966G Series II Wheel Loader specifications

Courtesy of Machine.Market
 Material Handling Buckets Rock Buckets Heavy-Duty
Rock Buckets

Teeth Teeth Teeth Teeth Teeth

Bolt-on and Bolt-on and Bolt-on and Bolt-on and Bolt-on and
edges segments Teeth edges segments Teeth edges segments Teeth edges segments edges segments

3.65 3.65 3.5 4.0 4.0 3.8 3.8 3.8 3.65 3.5 3.5 3.5 3.5
4.75 4.75 4.5 5.25 5.25 5.0 5.0 5.0 4.75 4.5 4.5 4.5 4.5
3.1 3.1 2.96 3.46 3.46 3.31 3.22 3.22 3.08 3.0 3.0 3.0 3.0
4.04 4.04 3.85 4.49 4.49 4.3 4.18 4.18 4.0 3.9 3.9 3.9 3.9
3059 3150 3150 3220 3311 3311 3220 3311 3311 3306 3252 3306 3252
10'0" 10'4" 10'4" 10'6" 10'10" 10'10" 10'6" 10'10" 10'10" 10'10" 10'8" 10'10" 10'8"
3135 2999 2999 3021 2874 2874 3063 2916 2916 2952 2756 2952 2756
10'3" 9'10" 9'10" 9'10" 9'5" 9'5" 10'0" 9'6" 9'6" 9'8" 9'0" 9'8" 9'0"
1281 1404 1404 1204 1313 1313 1162 1270 1270 1273 1381 1273 1381
4'2" 4'7" 4'7" 3'11" 4'3" 4'3" 3'9" 4'2" 4'2" 4'2" 4'6" 4'2" 4'6"
2651 2832 2832 2701 2882 2882 2641 2822 2822 2799 3013 2799 3013
8'8" 9'3" 9'3" 8'10" 9'5" 9'5" 8'7" 9'3" 9'3" 9'2" 9'10" 9'2" 9'10"
129 129 99 129 129 99 129 129 99 129 129 129 129
5.0" 5.0" 3.8" 5.0" 5.0" 3.8" 5.0" 5.0" 3.8" 5.0" 5.0" 5.0" 5.0"
8785 8988 8988 8835 9038 9038 8775 8978 8978 8933 9196 8933 9196
28'9" 29'5" 29'5" 28'11" 29'7" 29'7" 28'9" 29'5" 29'5" 29'3" 30'2" 29'3" 30'2"
5754 5754 5754 5783 5783 5783 5727 5727 5727 5716 5716 6042 6042
18'10" 18'10" 18'10" 18'11" 18'11" 18'11" 18'9" 18'9" 18'9" 18'9" 18'9" 19'9" 19'9"
14 535 14 732 14 732 14 709 14 905 14 905 14 679 14 874 14 874 14 837 14 945 14 837 14 945
47'8" 48'3" 48'3" 48'3" 48'10" 48'10" 48'1" 48'9" 48'9" 48'8" 49'0" 48'8" 49'0"
16 440 16 270 16 570 16 080 15 910 16 210 16 180 16 020 16 320 16 350 16 260 16 190 16 100
36,234 35,859 36,520 35,440 35,066 35,727 35,661 35,308 35,969 36,035 35,837 35,678 35,484
14 620 14 450 14 730 14 290 14 120 14 400 14 380 14 210 14 500 14 510 14 420 14 350 14 260
32,222 31,848 32,465 31,495 31,120 31,738 31,694 31,319 31,958 31,980 31,782 31,630 31,429
203.4 202.3 217.3 196.0 194.9 208.8 206.1 205.1 220.4 180.0 178.9 179.2 178.1
45,704 45,442 48,819 44,029 43,797 46,920 46,313 46,075 49,515 40,441 40,195 40,262 40,018
22 705 22 878 22 724 22 863 23 036 22 870 22 793 22 966 22 800 22 919 23 011 23 077 23 168
50,042 50,423 50,084 50,390 50,771 50,405 50,236 50,617 50,251 50,513 50,716 50,862 51,062

966G Series II Wheel Loader specifications 21

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Operation Specifications
Quick Coupler Buckets Waste High-
Buckets Lift
Delta*

Teeth
Bolt-on and Bolt-on All
edges segments Teeth edges buckets

Rated capacity m3 3.85 3.85 3.65 6.5

yd3 5.0 5.0 4.75 8.5
Struck capacity m3 3.3 3.3 3.1 5.6
yd3 4.3 4.3 4.1 7.28
Width mm 3112 3033 3033 3355
ft/in 10'2" 9'11" 9'11" 11'0"
Dump clearance at full lift mm 2975 2813 2813 2969 558
and 45° discharge ft/in 9'9" 9'2" 9'2" 9'8" 1'10"
Reach at full lift mm 1414 1546 1546 1220 –25
and 45° discharge ft/in 4'7" 5'0" 5'0" 4'0" –1.0"
Reach with lift arms mm 2861 3067 3067 2750 404
horizontal and bucket level ft/in 9'4" 10'0" 10'0" 9'0" 1'3"
Digging depth mm 139 139 108 154 –25
in 5.4" 5.4" 4.2" 6.0" –1.0"
Overall length mm 9003 9239 9239 8904 544
ft/in 29'6" 30'3" 30'3" 29'2" 1'9"
Overall height with bucket mm 5742 5742 5742 6162 558
at full raise ft/in 18'10" 18'10" 18'10" 20'2" 1'9"
Loader clearance circle with mm 14 699 14 765 14 765 14 877 432
bucket in carry position ft/in 48'2" 48'5" 48'5" 48'9" 1'5"
Static tipping load, straight** kg 16 890 16 810 17 170 18 560 810
lb 37,226 37,049 37,843 40,906 1785
Static tipping load, kg 15 020 14 940 15 280 16 430 550
articulated at full 37° turn lb 33,104 32,928 33,677 36,212 1212
Breakout force*** kN 172.0 172.6 184.1 184.9 –15.6
lb 38,633 38,770 41,363 41,542 –3505
Operating weight** kg 22 693 22 810 22 659 23 444 1900
lb 50,015 50,273 49,940 51,671 4188

* High lift column shows changes in specifications from standard lift to high lift.
Add or subtract as indicated to or from specifications given for appropriate bucket
to calculate high lift specifications.
** Static tipping load and operating weight shown include sound-suppression cab
and ROPS, 26.5 R25 XHA (L-3) steel radial tires, full fuel tank, coolant, lubricants
and operator.
*** Measured 102 mm (4.0"): behind tip of cutting edge with bucket hinge pin as pivot
point in accordance with SAE J732c.

22 966G Series II Wheel Loader specifications

Courtesy of Machine.Market
Dimensions
All dimensions are approximate.

11

18 12 6

5
1 2
3 13
14

19 10 15 9
4 17
7 8
16

1 Height to top of ROPS 3580 mm 11'9" 11 Rack back @ maximum lift 61°
2 Height to top of exhaust pipe 3535 mm 11'7" 12 Dump angle @ maximum lift
50°**
3 Height to top of hood 2555 mm 8'5" (GP bucket)
4 Ground clearance/ 13 Rack back @ carry 47°
Standard tire 26.5 R25 XHA (L-3) 471 mm 18.5" 14 Rack back @ ground 42°
See chart below for other tires 15 Axle Housing Clearance 430 mm 1'5"
5 B-Pin height 4225 mm 13'10" 16 Overall Length* Dimensions vary with bucket
6 Overall height* Dimensions vary with bucket 17 Digging Depth* Dimensions vary with bucket
7 Center line of rear axle to edge 18 Reach* Dimensions vary with bucket
of counterweight 2460 mm 8'1"
19 Height to center line of axle 795 mm 2'7"
8 Wheelbase 3450 mm 11'4"
9 B-Pin height @ carry 485 mm 19" **Refer to Operation Specifications chart.
**MH bucket is 45°.
10 Center line of rear axle to hitch 1725 mm 5'8"

Tires

Tread width for all tires is 2230 mm (7'4")

Change in Change in Change in
vertical operating static tipping
Width over tires dimensions weight load – straight
mm inches mm inches kg lb kg lb
26.5-25 20PR (L-2) 2965 117 –80 –3.2 –469 –1030 –349 –770
26.5-25 20PR (L-3) 3035 119 –25 –1.0 –224 –490 –168 –370
26.5 R25 XHA 1 (L-3)
standard 2965 117 — — — — — —
26.5 R25 GP-2B 1 (L-3) 3000 118 –30 –1.2 –49 –100 –36 –80
26.5 R25 MX (L-5) 3000 118 +63 +2.5 +1012 +2230 +732 +1314

NOTE:
Tire options include tires and rims.

In certain applications (such as load-and-carry work) the loader’s productive capabilities might exceed the tires’ tonnes-km/h (ton-mph)
capabilities. Caterpillar recommends consulting a tire supplier to evaluate all conditions before selecting a tire model.

966G Series II Wheel Loader specifications 23

Courtesy of Machine.Market
Standard Equipment
Standard equipment may vary. Consult your Caterpillar dealer for specifics.

Electrical Power Train

Alarm, back-up Brakes, full hydraulic enclosed wet-disc
Alternator, 65-amp, brushless with Integrated Braking System (IBS)
Batteries, (2) maintenance-free 950 CCA Engine, Cat 3176C diesel air to air aftercooled,
Ignition key; start/stop switch with ATAAC, electronically controlled
Lighting system, halogen (6 total) Fan, radiator, hydraulically driven, temperature sensing,
Main disconnect switch on-demand
Starter, electric, heavy-duty Filters, fuel/engine air, primary/secondary
Starting and charging system (24-volt) Fuel priming aid (electric pump)
Operator Environment Muffler, sound suppressed
Air conditioner, heater, defroster Precleaner, engine air intake
Bucket/Work Tool function lockout Radiator, unit core with ATAAC (6 fins per inch)
Cab, pressurized and sound suppressed Starting aid, ether
ROPS/FOPS, entertainment radio-ready includes Switch, transmission neutralizer lockout
antenna, speakers and converter (12-volt, 10-amp) Torque converter, free wheel stator
Cigar lighter and ashtray Transmission, automatic planetary power shift (4F/4R)
Coat hooks (2) with straps Variable Shift Control (VSC)
Controls, lift and tilt functions Other Standard Equipment
Computerized Monitoring System Automatic bucket positioner
Instrumentation, Gauges: Counterweight
Digital gear range indicator Couplings, Caterpillar O-ring face seal
Engine coolant temperature Diagnostic Pressure Taps
Fuel level Doors, service access, locking
Hydraulic oil temperature Ecology drains for engine, transmission, and hydraulics
Speedometer/tachometer Fenders, front and rear
Transmission oil temperature Hitch, drawbar with pin
Instrumentation, Warning Indicators: Hood, non-metallic power tilting
Axle oil temperature Hoses, Caterpillar XT™
Electrical, alternator output Hydraulic oil cooler
Engine air filter restriction Kickout, lift automatic, lift and tilt automatic
Engine inlet manifold temperature Linkage, Z-bar, cast crosstube/tilt lever
Engine oil pressure Oil sampling valves
Fuel level and pressure, Hi/Low Product Link Ready
Hydraulic filter bypass Sight gauges:
Hydraulic oil level Engine coolant
Parking brake Hydraulic oil level
Primary steering oil pressure Transmission oil level
Service brake oil pressure Vandalism protection caplocks
Transmission filter bypass
Horn, electric
Lunchbox and beverage holders
Mirrors, rearview (internally mounted)
Seat, Cat Comfort (cloth), air suspension (CC)
Seat, KAB (cloth), mechanical suspension (SW)
Seat belt, retractable, 76 mm (3 in) wide
Steering column, adjustable angle (SW, CC)
and length (CC)
Wet-arm, wipers/washers (front and rear),
intermittent front wiper
Windows, sliding (left and right sides)

24 966G Series II Wheel Loader specifications

Courtesy of Machine.Market
Optional Equipment
Optional equipment may vary. Consult your Caterpillar dealer for specifics.

Drive Train Starting Aid

Axle oil cooler Heater, engine coolant, 120-volt
Differential Limited Slip, front/rear axle Other Optional Attachments
Differential No SPIN, rear axle Airborne debris grill
Electrical Autolube
Auxiliary halogen lighting on cab, 2 front/2 rear Auto reversing fan
Directional lights Axle seals
Starting aid receptacle Corrosion resistant paint
Fenders Forest arrangement
Fender extensions High Lift arrangement
Roading fenders High Lift arrangement with hydraulic third valve
Guards High speed oil change
Axle seal Lift cylinder baffle
Power train Oil change system, high speed
Hydraulic Open cab, including ROPS structure
Automatic Ride Control Payload Control System
Hydraulic arrangement, third valve Quick coupler
Operator Environment Roof mounted air conditioning
Aggregates Autodig on CC/EH Rubber mounted glass cab
Joystick control Secondary steering
Lift lever F-N-R switch Value package
Machine Security System Various buckets and work tools
On the SW steering version: Waste Handler arrangement
Caterpillar Comfort air suspension seat,
6-way adjustable, cloth
Radio, AM/FM/Cassette with weatherband
Radio-Ready, CB with 20-amp 24V to 12V converter
Rearview mirrors, exterior
Visor
Preventive Maintenance
Cat Turbine Precleaner
Ecology drain, axle
Extended Life Coolant antifreeze (–35° to –50° C)
Product Link 201
Remote Diagnostics Pressure Taps

966G Series II Wheel Loader specifications 25

Courtesy of Machine.Market
Notes

26 966G Series II Wheel Loader specifications

Courtesy of Machine.Market
Notes

966G Series II Wheel Loader specifications 27

Courtesy of Machine.Market
 966G Series II Wheel Loader

For more complete information on Cat products, dealer services,

and industry solutions, visit us on the web at www.CAT.com

© 2003 Caterpillar
Printed in U.S.A.

AEHQ5521-02 (1-03) Materials and specifications are subject to change without notice.
Featured machines in photos may include additional equipment.
Replaces AEHQ5521-01 See your Caterpillar dealer for available options.

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