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770G Off-Highway Truck

770G Off-Highway Truck

At a Glance

Nominal Payload Class (100%)
42.1 ton (US)
Engine Model
Cat® C15
Top Speed - Loaded
45.8 mile/h
Rated Engine Speed
1700 r/min
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In 1963, Caterpillar introduced the 769, a revolutionary off-road truck that was purpose built for the rigors of mining and heavy construction. Fifty years later, our trucks have never been better. We’ve taken the best of our rugged, dependable heritage and combined it with technologies that help our environment, make your operators more productive and dramatically improve the economics of your haul fleet. This 770G has an updated traction control system to keep you moving when the ground conditions aren’t perfect, you’ll see improvements in fuel use through new and flexible fuel saving strategies, and we’re making the operating experience best in class with automotive quality shifting, noise reduction and cab updates. Our heritage and new use of technology are combined in this truck for one purpose – the continued success of your business.

Operating Specifications

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Nominal Payload Class (100%) 42.1ton (US)
Top Speed - Loaded 45.8mile/h
Target Payload (100%) 42.1ton (US)
Maximum Working Payload (110%) 46.3ton (US)
Maximum Allowable Payload (120%)* 50.5ton (US)
Body Capacity - SAE 2:1 32.9yd³
Note (1) *Refer to Caterpillar 10/10/20 Payload Policy for maximum gross machine weight limitations.
Note (2) Target payload and capacity based on Dual Slope body with no liner. Attachment selection will affect payload and maximum gross machine operating weight.


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Engine Model Cat® C15
Rated Engine Speed 1700r/min
Gross Power - SAE J1995 515HP
Net Power - SAE J1349 477HP
Net Power - ISO 9249 477HP
Net Power - 80/1269/EEC 489HP
Net Power - ISO 14396 508HP
Net Torque - SAE J1349 1834ft·lbf
Number of Cylinders 6
Bore 5.4in
Stroke 6.7in
Displacement 927.6in³
Note (1) Power rating applies at 1,700 rpm when tested under the specified condition for the specified standard.
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 (3) No engine derating required up to 3000 m (9,843 ft) altitude.
Note (4) Meets Japan Small Volume Exemption.
Emissions Meets U.S. EPA Tier 4 and EU Stage V emission standards.

Weights - Approximate

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Target Gross Machine Operating Weight 157000lb
Target Gross Machine Weight 157000lb
Chassis Weight 55948lb
Body Weight 17306lb
Note (1) Chassis weight with 100% fuel, hoist, body mounting group, rims, and tires.
Note (2) Body weight is the standard Dual Slope body with no liner and will vary depending on configuration.


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Forward - 1 7.4mile/h
Forward - 2 10.1mile/h
Forward - 3 13.8mile/h
Forward - 4 18.5mile/h
Forward - 5 25.1mile/h
Forward - 6 33.8mile/h
Forward - 7 45.8mile/h
Reverse 8.8mile/h
Note Maximum travel speeds with standard 18.00R33 (E4) tires.

Final Drives

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Differential Ratio 1.92:1
Planetary Ratio 4.80:1
Total Reduction Ratio 9.26:1


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Brake Surface - Front 216in²
Brake Surface - Rear 6235in²
Brake Standards ISO 3450:2011
Note Target gross machine operating weight is 71 214 kg (157,000 lb).

Body Hoists

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Pump Flow - High Idle 118gal/min
Relief Valve Setting - Raise 2750psi
Relief Valve Setting - Lower 500psi
Body Raise Time - High Idle 7.5s
Body Lower Time - Float 10s
Body Power Down - High Idle 10s

Capacity - Dual Slope - 100% Fill Factor

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Struck 23.01yd³
Heaped (SAE 2:1)* 32.9yd³
Note (2) *ISO 6483:1980.
Note (1) Contact your local Cat dealer for body recommendation.

Capacity - Flat Floor - 100% Fill Factor

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Struck 23.01yd³
Heaped (SAE 2:1)* 32.9yd³
Note (2) *ISO 6483:1980.
Note (1) Contact your local Cat dealer for body recommendation.

Weight Distributions - Approximate

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Front Axle - Empty 49%
Front Axle - Loaded 34%
Rear Axle - Empty 51%
Rear Axle - Loaded 66%


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Empty Loaded Cylinder Stroke Front 9.2in
Empty Loaded Cylinder Stroke Rear 5.9in
Rear axle - Oscillation 8.9°

Service Refill Capacities

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Fuel Tank 140gal (US)
Cooling System 33gal (US)
Crankcase 17gal (US)
Differential - Final Drives 47gal (US)
Steering Tank 14.5gal (US)
Steering System - Including Tank 23gal (US)
Brake/Hoist Hydraulic Tank 38gal (US)
Brake Hoist System 60gal (US)
Torque Converter - Transmission System 17gal (US)
DEF Tank 6gal (US)


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Steering Standards ISO 5010:2007
Steer Angle 40.5°
Turning Diameter - Front 57.7ft
Turning Circle - Clearance Diameter 66.6ft
Note Target gross machine operating weight is 71 214 kg (157,000 lb).


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Standard Tire 18.00R33 (E4)
Note (1) Productive capabilities of the 770G truck are such that, under certain job conditions, TKPH (TMPH) capabilities of standard or optional tires could be exceeded and, therefore, limit production.
Note (2) Caterpillar recommends the customer evaluates all job conditions and consults the tire manufacturer for proper tire selection.


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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.


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Sound Standards (1) Hearing protection may be needed when operating with open operator station & cab for extended periods or in noisy environment.
Sound Standards (2) Exterior sound pressure power level for standard machine measured according to tests specified in ISO 6395:2008 is 116 dB(A).
Sound Standards (3) Operator Equivalent Sound Pressure Level is 79 dB(A) & 74 dB(A) with EU sound suppression applied when ISO 6396:2008 is used.


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Height - Top of ROPS 12.7ft
Overall Body Length 26.8ft
Inside Body Length 18.5ft
Overall Length 28.9ft
Wheel Base 13ft
Rear Axle - Tail 8.5ft
Ground Clearance 1.6ft
Dump Clearance 1.7ft
Loading Height - Empty 10.3ft
Inside Body Depth - Maximum 4.6ft
Overall Height - Body Raised 27.1ft
Operating Width 15.7ft
Centerline Front Tire Width 10.2ft
Engine Guard Clearance 1.8ft
Outside Body Width 12.9ft
Inside Body Width 11.9ft
Front Canopy Height 13.5ft
Rear Axle - Clearance 1.8ft
Centerline of Rear Dual Tire Width 8.3ft
Overall Tire Width 12.1ft