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773G Off-Highway Truck

773G Off-Highway Truck

At a Glance

Nominal Payload Class (100%)
61 ton (US)
Engine Model
Cat® C27
Top Speed - Loaded
41.6 mile/h
Rated Engine Speed
1800 r/min
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The G Series represents a new era for Cat’s Off-Highway Trucks and the 773G provides our customers with a quality operating environment that enhances productivity and provides significant savings in fuel consumption, too. Ergonomically designed with an operator’s comfort in mind, the 773G has an updated cab with new comforts as well as controls conveniently placed within reach of the operator’s hands. Built with a Cat C27 diesel engine, this 60-ton payload uses increased torque delivering 5% additional horsepower. An ideal pass match for the 773G Off-Highway Truck is Cat’s 988K Wheel Loader, 990K Wheel Loader, or the 390F Hydraulic Excavator. Simply put, the 773G will make a positive difference in haul performance all day, every day for today and tomorrow’s work.

Operating Specifications

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Nominal Payload Class (100%) 61ton (US)
Top Speed - Loaded 41.6mile/h
Maximum Working Payload (110%) 67.1ton (US)
Note (2) * Refer to the Caterpillar 10/10/20 Payload Policy for maximum gross machine weight limitations.
Note (1) Capacity with Dual Slope body – no liner.
Body Capacity - SAE 2:1 46.8yd³
Target Payload (100%) 61ton (US)
Maximum Allowable Payload (120%)* 73.2ton (US)


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Engine Model Cat® C27
Rated Engine Speed 1800r/min
Gross Power - SAE J1995 775HP
Net Power - SAE J1349 719HP
Net Power - 80/1269/EEC 762HP
Net Power - ISO 9249 762HP
Bore 5.4in
Stroke 6in
Displacement 1648in³
Note (3) No engine derating required up to 3048 m (10,000 ft) for Tier 4/Stage V.
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).
Engine Power - ISO 14396 764HP
Net Torque 3148ft-lb
Peak Torque - Speed 1200r/min
Note (1) Power rating applies at 2,000 rpm when tested under the specified condition for the specified standard.

Capacity - Dual Slope - 100% Fill Factor

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Struck 35.13yd³
Note (1) Contact your local Cat dealer for body recommendation.
Note (2) * ISO 6483:1980.
Heaped (SAE 2:1)* 46.76yd³

Capacity - Flat Floor - 100% Fill Factor

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Struck 34.33yd³
Note (1) Contact your local Cat dealer for body recommendation.
Heaped (SAE 2:1)* 46.41yd³
Note (2) * ISO 6483:1980.

Weight Distributions - Approximate

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Front Axle - Empty 53%
Front Axle - Loaded 35%
Rear Axle - Empty 47%
Rear Axle - Loaded 65%


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Forward - 1 6.6mile/h
Forward - 2 9.3mile/h
Forward - 3 12.6mile/h
Forward - 4 16.8mile/h
Forward - 5 22.8mile/h
Forward - 6 30.7mile/h
Forward - 7 41.6mile/h
Reverse 8.7mile/h
Note Maximum travel speeds with standard 24.00R35 (E4) tires.

Final Drives

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Differential Ratio 3.64:1
Planetary Ratio 4.80:1
Total Reduction Ratio 17.49:1


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Brake Surface - Front 257in²
Brake Surface - Rear 9497in²
Brake Standards ISO 3450:2011

Service Refill Capacities

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Fuel Tank 210gal (US)
Cooling System 45gal (US)
Differential - Final Drives 38gal (US)
Steering Tank 9.5gal (US)
Steering System - Including Tank 14gal (US)
Brake Hoist System 85gal (US)
Brake/Hoist Hydraulic Tank 46.5gal (US)
Crankcase 24gal (US)
Torque Converter - Transmission System - HRC 18gal (US)

Body Hoists

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Pump Flow - High Idle 118gal/min
Relief Valve Setting - Raise 2502psi
Relief Valve Setting - Lower 500psi
Body Raise Time - High Idle 10s
Body Lower Time - Float 14s
Body Power Down - High Idle 14s


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Rear axle - Oscillation 8.1°
Empty Loaded Cylinder Stroke Front 9.2in
Empty Loaded Cylinder Stroke Rear 5.8in

Weights - Approximate

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Maximum Gross Vehicle Weight 226501lb


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Turning Diameter - Front 77.1ft
Steering Standards SAE J1511 FEB94 ISO 5010:1992
Steer Angle 31°
Turning Circle - Clearance Diameter 85.6ft


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Note (1) Productive capabilities of the 773G 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 evaluate all job conditions and consult the tire manufacturer for proper tire selection.
Standard Tire 24.00R35 (E4)


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


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Sound Standards (1) The operator Equivalent Sound Pressure Level (Leq) is 76 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
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 86 dB(A).
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.