777G Off-Highway Truck

777G Off-Highway Truck

360° Exterior View

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 ...

Operating Specifications

Nominal Payload Class (100%)
98.4ton (US)
Top Speed - Loaded
Target Payload (100%)
98.4ton (US)
Maximum Allowable Payload (120%)*
118.1ton (US)
Body Capacity - SAE 2:1
Note (1)
Capacity with flat floor X Body with liner.
Note (2)
* Refer to the Caterpillar 10/10/20 Payload Policy for maximum gross vehicle weight limitations.
Maximum Working Payload (110%)
108.2ton (US)


Engine Model
Cat® C32 ACERT™
Gross Power - SAE J1995
Net Power - SAE J1349
Net Power - 80/1269/EEC
Net Power - ISO 9249
Note (2)
Ratings based on SAE J1995 standard air conditions of 25° C (77° F) and 100 kPa (29.61 Hg) barometer. Power based on fuel having API gravity of 35 at 16° C (60° F) and an LHV of 42 780 kJ/kg (18,390 BTU/lb) when engine used at 30° C (86° F).
Note (1)
Power rating applies at 1,800 rpm when tested under the specified condition for the specified standard.
Peak Torque - Speed
Net Torque
Engine Speed
Engine Power - ISO 14396
Note (4)
Meets EU Stage V emission standards.
Note (3)
No engine derating required up to 2286 m (7,500 ft) for Tier 4/Stage V.

Capacity - Dual Slope - 100% Fill Factor

Note (2)
*ISO 6483:1980
Note (1)
Contact your local Cat dealer for body recommendation.
Heaped (SAE 2:1)*

Weight Distributions - Approximate

Front Axle - Empty
Front Axle - Loaded
Rear Axle - Empty
Rear Axle - Loaded


Forward - 1
Forward - 2
Forward - 3
Forward - 4
Forward - 5
Forward - 6
Forward - 7
Maximum travel speeds with standard 27.00R49 (E4) tires.

Final Drives

Differential Ratio
Planetary Ratio
Total Reduction Ratio


Brake Standards
ISO 3450-2011
Brake Surface Area - Rear
Brake Surface Area - Front

Service Refill Capacities

Fuel Tank (1)
300gal (US)
Cooling System
63.4gal (US)
Steering System - Including Tank
14.1gal (US)
Fuel Tank (2)
350gal (US)
Final Drive - Each
20gal (US)
Brake Hoist System - Includes Tank
117gal (US)
Brake Hoist System
85gal (US)
28.7gal (US)
59.9gal (US)
Torque Converter - Transmission System
36.5gal (US)

Body Hoists

Pump Flow - High Idle
Relief Valve Setting - Raise
Relief Valve Setting - Lower
Body Raise Time - High Idle
Body Lower Time - Float
Body Lower Time - High Idle


Rear axle - Oscillation
Empty Loaded Cylinder Stroke Front
Empty Loaded Cylinder Stroke Rear

Capacity - X Body - 100% Fill Factor

Note (2)
*ISO 6483:1980
Note (1)
Contact your local Cat dealer for body recommendation.

Weights - Approximate

Target Gross Machine Weight

Capacity - Coal Bodies - 100% Fill Factor

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


Turning Diameter - Front
Steering Standards
ISO 5010:2007
Steer Angle
Turning Circle - Clearance Diameter


Sound Standards (3)
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 a noisy environment.
Sound Standards (2)
The exterior sound pressure level for the standard machine measured at a distance of 15 m (49 ft) according to the test procedures specified in SAE J88:2008, mid?gear moving operation is 83 dB(A) for Tier 4 trucks.
Sound Standards (1)
The operator Equivalent Sound Pressure Level (Leq) is 73 dB(A) when SAE J1166 FEB2008 is used to measure the value for an enclosed cab. This is a work cycle sound exposure level. The cab was properly installed and maintained. The test was conducted with t


ROPS Standards
Rollover Protective Structure (ROPS) for cab offered by Caterpillar meets ISO 3471:2008 ROPS criteria.
FOPS Standards
Falling Objects Protective Structure (FOPS) meets ISO 3449:2005 Level II FOPS criteria.


Note (2)
Caterpillar recommends the customer evaluate all job conditions and consult the tire manufacturer for proper tire selection.
Note (1)
Productive capabilities of the 777G truck are such that, under certain job conditions, TKPH (TMPH) capabilities of standard or optional tires could be exceeded and, therefore, limit production.
Standard Tire
27.00R49 (E4)

Safety – 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 contactAggressive 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 (ARC) for downhill grades
  • New Traction Control System (TCS)

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 operator’s 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.

  • ARC 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
  • TCS 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
  • For the U.S. and Canada, Tier 4 emission controls are available
  • 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
Tier 4/Stage V

Caterpillar’s simple solution is transparent to your operators, controls emissions, and increases fuel efficiency.

  • Two engine-mounted diesel oxidation catalyst canisters control particulate matter
  • Our NRS Technology replaces a portion of intake air with exhaust gas to control combustion temperatures and NOx production
  • Precise, extremely fine atomization of fuel under all load conditions

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.

Performance – 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 Control 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, so 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
  • Electronic Clutch Pressure Control (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 (standard for Tier 4/Stage V machines) 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 sideboards 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 6393:2008 and ISO 6395:2008 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.

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
  • Keypad 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

Standard Equipment:

Optional Equipment:

    Optional Equipment
    • Body heat
    • Body liners
    • Body sideboards
    • Cab precleaner
    • Cat Engine Brake
    • Clustered grease fittings
    • Cold weather packages
    • 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)