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Off-Highway Trucks

Caterpillar builds Off-Highway Trucks specifically for work in mines, construction and quarries. Our Off-Highway Trucks are pass-matched with Cat Wheel Loaders and Hydraulic Excavators to speed cycle times and maximize productivity.

777G Off-Highway Truck

G Series represents a new era for this size class from Caterpillar. With your input, we have designed and manufactured a truck that is reliable, economical and offers comfort, confidence and control for your operators. Your long-term success is our goal; with G Series trucks, we’re on the right road.

  • Specification Summary

  • Nominal Payload Class (100%)90.8 tonnes
  • Engine ModelCat® C32 ACERT™
  • Top Speed – Loaded67.1 km/h
  • Gross Power – SAE J1995765 kW
  • Net Power – SAE J1349704 kW
  • Product Brochure


Product Details

Operating Specifications

Nominal Payload Class (100%) 90.8 tonnes
Top Speed – Loaded 67.1 km/h
Body Capacity – SAE 2:1 64.1 m3
Maximum Payload (110%) 99.8 tonnes
Nominal Payload (100%) 90.8 tonnes
Not to Exceed Payload (120%)* 109 tonnes


Engine Model Cat® C32 ACERT™
Gross Power – SAE J1995 765 kW
Net Power – SAE J1349 704 kW
Net Power – 80/1269/EEC 704 kW
Net Power – ISO 9249 704 kW
Bore 146 mm
Stroke 162 mm
Displacement 32.1 L
Cylinders 12
Engine Power – ISO 14396 755 kW
Engine Speed 1800 RPM
Net Torque 5286 N·m
Peak Torque Speed 1200 RPM

Weights – Approximate

Target Gross Machine Weight 164654 kg

Capacity – Dual Slope – 100% Fill Factor

Struck 41.9 m3
Heaped 2:1 (SAE) 60.2 m3

Weight Distributions – Approximate

Front Axle – Empty 46 %
Front Axle – Loaded 33 %
Rear Axle – Empty 54 %
Rear Axle – Loaded 67 %


Forward 1 10.9 km/h
Forward 2 14.8 km/h
Forward 3 20.1 km/h
Forward 4 27.2 km/h
Forward 5 36.9 km/h
Forward 6 49.4 km/h
Forward 7 67.1 km/h
Reverse 12.4 km/h

Final Drives

Differential Ratio 2.736:1
Planetary Ratio 7.0:1
Total Reduction Ratio 19.1576:1


Brake Standards ISO 3450:1996
Brake Surface Area – Front 40846 cm2
Brake Surface Area – Rear 102116 cm2

Service Refill Capacities

Fuel Tank 1136 L
Cooling System 228 L
Steering System (Includes Tank) 53.6 L
Brake Hoist System 322 L
Brake Hoist System (Includes Tank) 444 L
Crankcase 109 L
Differentials 227 L
Final Drives (each) 76 L
Fuel Tank 1325 L
Torque Converter/Transmission System 138.5 L

Body Hoists

Pump Flow – High Idle 458 L/min
Relief Valve Setting – Raise 18950 kPa
Relief Valve Setting – Lower 3450 kPa
Body Raise Time – High Idle 15 Seconds
Body Lower Time – Float 13 Seconds
Body Lower Time – High Idle 13 Seconds


Rear Axle Oscillation 5.4 Degrees
Empty Loaded Cylinder Stroke Front 74.7 mm
Empty Loaded Cylinder Stroke Rear 66 mm


Sound Standards Standards


ROPS/FOPS Standards Standards

Capacity – Coal Bodies – 100% Fill Factor

SAE 2:1 for use with material densities less than 950 kg/m3 (1,600 lb/yd3) 126 m3
SAE 2:1 for use with material densities of 1040-1160 kg/m3 (1,750-1,950 lb/yd3) 106 m3
SAE 2:1 for use with material densities of 1160 kg/m3 (1,950 lb/yd3) 89 m3
SAE 2:1 for use with material densities of 950-1040 kg/m3 (1,600-1,750 lb/yd3) 110 m3

Capacity – X Body – 100% Fill Factor

Heaped 2:1 (SAE) 64.1 m3
Struck 43.1 m3


Turning Diameter – Front 25.3 m
Steering Standards SAE J1511 FEB94 ISO 5010:1992
Steer Angle 30.5 Degrees
Turning Circle Clearance Diameter 28.4 m


Standard Tire 27.00R49 (E4)


Connecting people and equipment safely

A Focus on Personnel

The 777G is designed to minimize slips and falls, providing firm footing and stability.
  • Ground level daily check points
  • Low effort, integrated access system with hand rails for three points of contact
  • Aggressive tread plate on all step areas with lighted access for after dark
  • Integrated windshield washing platform

Confidence and Control

Confident operators will move material quickly, efficiently and profitably.
  • Wet Disc Braking is standard on all four corners of the truck
  • Four corner park brake for slope holding capability and brake wear indicator
  • Automatic Retarding Control for downhill grades
  • New traction control system


The 777G supports your site safety plan with object detection.
  • Visual or audible warning of people or objects close to the machine
  • A combination of cameras and radar to identify potential hazards

Key Features

The 777G is solidly constructed for safety.
  • Rollover and Falling Object Protection is part of the cab structure
  • Emergency egress available through the right-side hinged window
  • Laminated glass is used in the front and left side windows
  • Ground level engine shutdown
  • Back-up alarm

Operator Safety

Providing features that fit your operators’ needs.
  • Fully adjustable and suspended seat
  • Integrated three point safety belt
  • Trainer seat with lap belt facilitates on-the-job task training
  • Audible warnings for Events and fluid level monitoring
  • Automatic derate of the engine possible on some events

Job Site Safety

Safety is a key to hauling productively.
  • Speed limiting on the haul is new and more efficient than gear limiting
  • Excellent visibility with mirror and lighting options
  • Secondary steering in the event of a shutdown
  • Speed limiting during body up operations

Operator Work Environment

Productivity from comfort, confidence, control


The comfort of your crew will dictate their productivity and awareness on the job.
  • Easy, low effort access to the cab
  • Ergonomic, intuitive controls
  • Left side power window
  • Automatic temperature control inside the cab
  • Throttle lock convenience for long uphill climbs
  • The cab is spacious with window area that supports visibility
  • An integrated footrest provides comfort and support
  • Sound suppression has decreased noise by 50%
  • The cab is isolation mounted reducing noise and vibration
  • Lighting packages illuminate both to the side and front of the vehicle
  • Automotive quality shifting from new transmission controls

Confidence and Control

Strong, predictable performance will help your operators achieve the lowest cost per ton.
  • Automatic Retarding Control reduces operator effort and controls braking on downhill grades
  • Performance and health information at a glance using well lit gauges and the Advisor Message Display
  • Solid steering performance from a design that maintains its integrity
  • Stopping power from fade-resistant brakes - purpose built for off road applications and the loads carried by the 777G
  • Traction control is now steering sensitive and uses the service brakes to control wheel slip. The result: faster activation and improved response to wheel slip
  • Visibility is excellent with extensive mirror options, large window areas and object detection.
Cab layout subject to change with optional equipment.


The Advisor display and VIMS software are important reporting tools that help you analyze:
  • Productivity, haul road efficiency, operator skill
  • Fuel use, cycle times, idle time
  • Machine health and Events

Environmental Responsibility

The benefits are far reaching and economical

As you progress towards a more sustainable business model, the Cat 777G can help.

Fuel and Emissions

  • There are substantial fuel saving strategies on the 777G
  • Two fuel economy modes can be adjusted to meet your daily production needs


  • Operator noise is reduced by 50%
  • Spectator noise levels can be lowered up to 50% with the optional “XQ” package

Component Life

  • Remanufactured parts are an economical and eco-friendly alternative to new
  • Extend tire life by using the TKPH/TMPH feature that calculates tire loading
  • A mud protection package is available to help keep power train components clean
  • Castings and box section frame construction ensure long life
  • A new rear axle housing adds strength and enables axle filtration and lubrication
  • Hydraulic oil filter life is extended to 1,000 hours under normal conditions
  • Autostall enables quick operating temperatures for best performance and life
  • Delayed Engine Shutdown prevents hot shut downs that can reduce component life

Cutting Your Fuel Costs

A strategy for lowering your cost per ton

The 777G introduces several key fuel conservation features:
  • Auto Neutral Idle - as the 777G idles in a forward gear, the transmission will automatically slip in and out of a neutral state to avoid stalling the torque converter and raising engine rpm.
  • Engine Idle Shutdown - when your G Series truck is in park and idles for more than a preset time, the truck will initiate engine shutdown to conserve fuel. This feature can be time adjusted or turned on or off according to your specific needs.
  • Speed Limiting - while you can continue to gear limit your G Series trucks, Caterpillar offers speed limiting that allows the truck to travel at a more fuel efficient engine speed and gear selection.
  • Transmission Controls - New APECS transmission controls increase fuel efficiency by maintaining momentum and speed on grade.

Economy Modes

  • Standard Economy Mode - G Series can save fuel by adjusting engine power through this newly adjustable economy mode. Adjust the power based on your site, fleet and economic conditions. The power can be reduced from 0.5 to 15 percent.
  • Adaptive Economy Mode - New for G Series - this economy mode requires a baseline for production from you using the Advisor display. As the truck transits the haul cycle, it is constantly evaluating its ability to meet your baseline in a reduced power rating. Where full power is needed, full power is applied, where reduced power works, reduced power is applied. It’s fully automatic with no special operation required.


Efficient application of power and technology

The 777G will haul your material faster and more efficiently with increases in torque, new transmission controls and higher travel speeds.
  • A 7% increase in torque puts more power to the ground
  • New transmission controls carry more torque through the shifts, producing faster cycle times, most noticeably on grades
  • An increase in travel speed in 7th gear also helps generate faster cycle times

Traction Control

G Series introduces benefits to your fleet when running in wet conditions by introducing a more responsive traction controls system.
  • The system is steering sensitive to determine slip vs. high speed turns
  • The system engages at slower speeds returning traction sooner
  • The system engages sooner in the slip, potentially reducing tire wear
  • The system modulates instantly between the two wheel groups for control
  • Using the hydraulic service brakes facilitates the instant modulation and responsiveness

Long Term Value and Durability

Proven components for reliable performance

At Caterpillar, we know keeping your trucks running is critical to your business, that’s why we use industry leading technology to ensure maximum machine availability and reliability.

Structural Strength

The backbone of the 777G is its frame. Our frames are designed for off-road integrity and are built for more than one life cycle.
  • We strategically apply castings with box section construction to manage off-road stresses
  • A new front frame design increases the approach angle on ramps and grades
  • A new robust rear axle housing supports the truck’s performance increases

Brake Performance

Cat trucks provide powerful, fade-resistant braking for your off road applications. G Series introduces new ways to extend brake life.
  • Additional springs in the design reduce wear and increase service life
  • All four corners have wet disc braking standard (front brake lockout no longer an option)
  • Slope holding capability benefits from all wheel parking brake actuation
  • Brake life can be extended by choosing the optional Cat Engine Brake
  • A brake wear indicator keeps you informed of maintenance timing
  • Extended life brake material is available for extreme applications

Not only proven, but continuously improving with the latest technical advantages and efficiencies.


  • Front struts use our proven king pin design for effective absorption of haul road shocks
  • Rear suspension cylinders have been inverted to minimize contamination

Planetary Powershift Transmission with APECS Controls

  • New APECS controls are delivering performance improvements
  • Torque shift management allows the truck to power through shift points
  • Part throttle shifting provides an exceptionally smooth ride
  • ECPC electronically controls clutch pressures for long life

Updated Cat C32 ACERT

  • For the 777G, the engine and torque converter are producing 7% more usable torque giving the truck new performance levels and quick haul cycles
  • Cat MEUI™ injectors provide high pressure, fine atomization for fuel efficiency and load response
  • Low pressure fuel lines from the tank to the engine simplify service
  • The C32 is carefully balanced with vibration controls that reduce noise and protect against unnecessary harmonics
  • Cooling is provided by either a demand fan or a conventional cooling fan
  • Ground level engine shutdown switch for safety
  • Excellent high-altitude capability


  • The steering linkage is designed to provide good feedback to the operator
  • The Cat king pin front suspension system maintains steering tolerances and also tire alignment

Body Options

No matter your material type

Our bodies are designed to offer you the best possible performance, longevity and value by taking into consideration tire life, the truck’s center of gravity, load distribution targets and power train design.

Dual Slope Body

If your haul profile includes steep slopes, the dual slope body offers excellent material retention.
  • The dual slope has a heaped capacity of 60.2 m3 (78.8 yd3) in its standard configuration
  • Two sizes of side board are available to increase capacity for lighter weight materials
  • 400 BNH steel on interior surfaces offers excellent wear characteristics
  • Material is carried low and centered for stability
  • A single 16 mm (0.62 in) steel liner option is available for this body
  • A single rubber liner is available for this body

X Body

If you’re feeding a crusher, the flat floor of the X Body is an excellent choice for metering material.
  • The X Body also offers excellent material retention and stability
  • 400 BNH and 450 BNH steel are used on internal surfaces for wear protection
  • Two steel liner options are available for the X Body
  • A rubber liner option is also available

The Rubber Liner

This important option will protect your truck’s body in hard rock applications.
  • Available for the dual slope and X Bodies
  • Suppresses noise and vibration to the operator
  • Suppresses spectator noise
  • Prolongs body life in high impact, hard rock applications

Coal Bodies

For lightweight materials, Caterpillar offers coal bodies of varying capacities.
  • Material density will dictate the recommended body size
  • 400 BNH steel is used for long wear life
  • Capacities include:
- 89 m3 (116 yd3) - 106 m3 (139 yd3) - 110 m3 (144 yd3) - 126 m3 (165 yd3)

XQ Package

For your sound sensitive environments

  • The XQ package reduces the 777G’s spectator noise level to 112 dB(A) using both the ISO 6393 and ISO 6395 test procedures. This test result has an accuracy of plus or minus 1 dB(A).
  • This package includes a noise reduced Cat C32 engine, panels that enclose the engine compartment and sound reduction material within the radiator cowl.
  • Sound reduction material in the cab is standard on the truck.
  • Tier 2 trucks shipping outside of the U.S. and Canada will come equipped with a demand fan for the XQ package.

Mud Protection Package

For sticky, muddy environments

A mud package that encloses the engine compartment will help protect against sticky, difficult material.

Service Convenience

Simple, more cost-effective solutions

Service Centers - Fluid Fill

You will save both time and money using the optional fluid fill service center.
  • Fill and extraction for all fluids in one location
  • Key pad tells employees current fluid levels
  • Includes all oils, coolant and fuel
  • Conveniently located at ground level
  • Lighted for night time use

Service Centers - Electrical Connections

  • The convenience of ground level access to VIMS data
  • Ground level access to ET port
  • Master disconnect switch
  • Engine lockout switch
  • Hydraulics lockout switch
  • Breaker access

Brake Monitoring

G Series introduces several brake system updates:
  • A brake wear indicator is standard
  • Additional internal springs increase separation forces to increase life
    •  Autostall
    •  Engine idle shutdown
    •  Air-To-Air Aftercooler (ATAAC)
    •  Air cleaner with precleaner (2)
    •  Automatic cold mode idle control
    •  Electric priming pump
    •  Electric cold weather start (two starters and four batteries)
    •  Ether starting aid
    •  Exhaust, muffler
    •  Fuel filter/water separator
    •  Turbocharger (2)
    •  Braking system: - Brake wear indicator - Automatic Retarder Control (ARC) (utilizes oil-cooled, multiple disc brakes) - Brake release motor (towing) - Manual retarder (utilizes oil cooled, multiple disc brakes) - Oil-cooled, multiple disc (front/rear) - Pa
    •  Transmission: - Auto neutral idle - APECS Software - ECPC
    •  Part Throttle Shifting: - 7 speed automatic powershift with Torque Shift Management electronic clutch pressure control - Body up shift inhibitor - Directional shift management - Downshift inhibitor - Neutral start switch - Neutral coast inhibitor - Reverse
    •  Suspension, rear (EU Compliant)
  • Suspension, rear (EU Compliant)
      •  Alarm, backup
      •  Alternator, 115 ampere
      •  Auxiliary jump start receptacle
      •  Batteries, maintenance-free, 12V (4), 190 amp-hour
      •  Electrical system, 25 AMP, 24V to 12V converter
      •  Lighting system: - Backup light (halogen) - Directional signals/hazard warning, (front and rear LED) - Headlights, (halogen) with dimmer - Payload, indicator lights - Operator access courtesy lights - Side profile lights - Stop/tail lights (LED) - Service
      •  Air conditioning
      •  Ashtray and cigarette lighter
      •  Coat hook
      •  Cup holders (4)
      •  Diagnostic connection port, 24V
      •  Entertainment Radio Ready: - 5 amp converter - Speakers - Antenna - Wiring harness
      •  Gauges/indicators: - Brake oil temperature gauge - Coolant temperature gauge - Hour meter - Tachometer - Engine overspeed indicator - Fuel level - Speedometer with odometer - Transmission gear indicator
      •  Heater/defroster (11 070 kCal/43,930 BTU)
      •  Auto temp control
      •  Fluid level monitoring
      •  Hoist lever
      •  Horn, electric
      •  Light - dome
      •  Light - courtesy
      •  Load counter, automatic
      •  Advisor display
      •  VIMS
      •  TPMS
      •  Foot rest
      •  Mirrors - heated
      •  Power port, 24V and 12V (2)
      •  ROPS cab, insulated/sound suppressed
      •  Cat Comfort Series III: - Full air suspension - Retractable 3 point seat belt with shoulder harness
      •  Steering wheel, padded, tilt and telescopic
      •  Storage compartment
      •  Sun visor
      •  Throttle lock
      •  Window, right side, hinged access/egress
      •  Electric left side window control
      •  Windshield wiper (intermittent) and washer
      •  Tinted, laminated glass
    • Air conditioning
      • Ashtray and cigarette lighter
        • Coat hook
          • Cup holders (4)
            • Diagnostic connection port, 24V
              • Entertainment Radio Ready: - 5 amp converter - Speakers - Antenna - Wiring harness
                • Gauges/indicators: - Brake oil temperature gauge - Coolant temperature gauge - Hour meter - Tachometer - Engine overspeed indicator - Fuel level - Speedometer with odometer - Transmission gear indicator
                  • Heater/defroster (11 070 kCal/43,930 BTU)
                    • Auto temp control
                      • Fluid level monitoring
                        • Hoist lever
                          • Horn, electric
                            • Light - dome
                              • Light - courtesy
                                • Load counter, automatic
                                  • Advisor display
                                    • VIMS
                                      • TPMS
                                        • Foot rest
                                          • Mirrors - heated
                                            • Power port, 24V and 12V (2)
                                              • ROPS cab, insulated/sound suppressed
                                                • Cat Comfort Series III: - Full air suspension - Retractable 3 point seat belt with shoulder harness
                                                  • Steering wheel, padded, tilt and telescopic
                                                    • Storage compartment
                                                      • Sun visor
                                                        • Throttle lock
                                                          • Window, right side, hinged access/egress
                                                            • Electric left side window control
                                                              • Windshield wiper (intermittent) and washer
                                                                • Tinted, laminated glass
                                                                  • TECHNOLOGY PRODUCTS
                                                                    •  Product Link Ready (Level 1)
                                                                    •  TKPH/TMPH (Tons Kilometer Per Hour/Tons Mile Per Hour)
                                                                    •  Object Detection (4 cameras, 4 radars)
                                                                    •  Adaptive economy mode
                                                                  • Product Link Ready (Level 1)
                                                                    • TKPH/TMPH (Tons Kilometer Per Hour/Tons Mile Per Hour)
                                                                      • Object Detection (4 cameras, 4 radars)
                                                                        • Adaptive economy mode
                                                                          • GUARDS
                                                                            •  Engine crankcase
                                                                            •  Driveline
                                                                            •  Fan and A/C
                                                                          • FLUIDS
                                                                            •  Extended Life Coolant to -35° C (-30° F)
                                                                          • Extended Life Coolant to -35° C (-30° F)
                                                                            • OTHER STANDARD EQUIPMENT
                                                                              •  Body mounting group
                                                                              •  Body safety pin (secures body in up position)
                                                                              •  Body down indicator
                                                                              •  CD ROM parts book
                                                                              •  Center mounted rims
                                                                              •  Fuel tank (1136 L/300 gal)
                                                                              •  Ground level battery disconnect
                                                                              •  Ground level engine shutdown
                                                                              •  Ground level grease fittings
                                                                              •  Reservoirs (separate): - Brake/hoist - Steering - Transmission/torque converter
                                                                              •  Rims 19.5 × 49
                                                                              •  Rock ejectors
                                                                              •  Supplemental steering (automatic)
                                                                              •  Tie down eyes
                                                                              •  Tow hooks (front)/Tow pin (rear)
                                                                              •  Vandalism protection locks
                                                                              •  Wiggins fast fuel
                                                                              •  Traction Control System (new version)
                                                                              •  Attachment Zone
                                                                            • Body mounting group
                                                                              • Body safety pin (secures body in up position)
                                                                                • Body down indicator
                                                                                  • CD ROM parts book
                                                                                    • Center mounted rims
                                                                                      • Fuel tank (1136 L/300 gal)
                                                                                        • Ground level battery disconnect
                                                                                          • Ground level engine shutdown
                                                                                            • Ground level grease fittings
                                                                                              • Reservoirs (separate): - Brake/hoist - Steering - Transmission/torque converter
                                                                                                • Rims 19.5 × 49
                                                                                                  • Rock ejectors
                                                                                                    • Supplemental steering (automatic)
                                                                                                      • Tie down eyes
                                                                                                        • Tow hooks (front)/Tow pin (rear)
                                                                                                          • Vandalism protection locks
                                                                                                            • Wiggins fast fuel
                                                                                                              • Traction Control System (new version)
                                                                                                                • Attachment Zone
                                                                                                                  • Body heat
                                                                                                                    • Body liners
                                                                                                                      • Body side boards
                                                                                                                        • Cab precleaner
                                                                                                                          • Cat Engine Brake
                                                                                                                            • Clustered grease fittings
                                                                                                                              • Cold weather packages
                                                                                                                                • Extended Life Brakes
                                                                                                                                  • Fluid fill service center
                                                                                                                                    • HID lights
                                                                                                                                      • Mirrors, convex
                                                                                                                                        • Mirrors, heated
                                                                                                                                          • Spare rim
                                                                                                                                            • Visibility package (meets ISO 5006 requirements)
                                                                                                                                              • Wheel chocks
                                                                                                                                                • Work Area Vision System (WAVS)

                                                                                                                                                  360° Exterior View

                                                                                                                                                  360° Interior View

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