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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. The 770G has an updated Traction Control System (TCS) to keep you moving even when the ground conditions aren’t perfect. You’ll see improvements in fuel use through new and flexible fuel savings 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.

Cat Specs

Operating Specifications

Nominal Payload Class (100%)
42.1 ton (US)
Top Speed - Loaded
45.8 mile/h
Maximum Working Payload (110%)
46.3 ton (US)
Body Capacity - SAE 2:1
32.9 yd³
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.


Gross Power - SAE J1995
515 HP
Rated Engine Speed
1700 r/min
Meets U.S. EPA Tier 4 and EU Stage V emission standards.
Net Power - SAE J1349
477 HP
Net Power - 80/1269/EEC
489 HP
Note (1)
Power rating applies at 1,700 rpm when tested under the specified condition for the specified standard.
Net Power - ISO 14396
508 HP
Net Torque - SAE J1349
1834 ft·lbf
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 B
Note (3)
No engine derating required up to 3000 m (9,843 ft) altitude.
Number of Cylinders
5.4 in
6.7 in
Note (4)
Meets Japan Small Volume Exemption.
927.6 in²
Net Power - ISO 9249
477 HP
Engine Model
Cat® C15

Weights - Approximate

Target Gross Machine Operating Weight
157000 lb
Target Gross Machine Weight
157000 lb
Chassis Weight
55948 lb
Body Weight
17306 lb
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.


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

Final Drives

Differential Ratio
Planetary Ratio
Total Reduction Ratio


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

Body Hoists

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


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

Capacity - Dual Slope - 100% Fill Factor

23.01 yd³

Capacity - Flat Floor - 100% Fill Factor

23.01 yd³

Weight Distributions - Approximate

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


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

Service Refill Capacities

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


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


Standard Tire
18.00R33 (E4)
Note (2)
Caterpillar recommends the customer evaluates all job conditions and consults the tire manufacturer for proper tire selection.
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.


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.


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.
With Cooling Fan Speed at Maximum Value – Note
*ISO 6483:1980.