Overview
The Caterpillar 789C Rock Truck is a articulated dump truck listed in the Heavy Equipment Hub equipment database with structured specifications for comparison, research, and machine selection. Key specification points include engine power of 1,770 hp, travel speed of 32.7 mph, fuel capacity of 851.0 gal and hydraulic capacity of 140.0 gal. This model can be reviewed for equipment comparison, jobsite planning, fleet research, and specification-based machine selection. Use the full specifications table to compare the Caterpillar 789C Rock Truck against similar articulated dump truck models by power, weight, capacity, dimensions, speed, and other technical values.
Key Specifications
Net Power
1,874
hp
Gross Power
1,900
hp
Rated Payload
390,000
lb
Overall Length
39.92
ft
Full Specifications
98 specs
Dimensions
Dump Angle
49.50 deg
Dump Ground Clearance
4.37 ft / 1.33 m
Dump Height
39.25 ft / 11.96 m
Ground Clearance
3.83 ft / 1.17 m
Load Capacity - Heaped
137 lb / 62 kg
Load Capacity - Struck
102 lb / 46 kg
Overall Height
20.25 ft / 6.17 m
Overall Length
39.92 ft / 12.17 m
Overall Width
25.18 ft / 7.67 m
Rated Payload
390,000 lb / 176,901 kg
Wheelbase
18.68 ft / 5.69 m
Engine
6.5 mile/h
1
Alternator Supplied Amperage
75 A
Body Power Down - High Idle
15.60
Bore
6.70 in / 170 mm
Brake Surface - Front
12,662
Brake Surface - Rear
18,024
Brake/Hoist System Fluid Capacity
240 gal / 908.5 L
Cooling System Fluid Capacity
175 gal / 662.4 L
Diff And Final Drive Fluid Capacity
154 gal / 583.0 L
Differential Ratio
2.35
Displacement
4,211 cu in / 69.0 L
Empty Weight
299,101 lb / 135,670 kg
Engine Make
2236
Engine Model
3516B EUI
Engine Oil Capacity
20 gal / 75.7 L
Forward - 1
7.20 mph / 11.6 km/h
Forward - 2
9.80 mph / 15.8 km/h
Forward - 3
13.20 mph / 21.2 km/h
Forward - 4
17.80 mph / 28.6 km/h
Forward - 5
24.20 mph / 38.9 km/h
Forward - 6
32.70 mph / 52.6 km/h
Front Axle - Empty
47 lb / 21 kg
Front Axle - Loaded
33 lb / 15 kg
Fuel Capacity
851 gal / 3,221.4 L
Gross Power
1,900 hp / 1,416.8 kW
Gross Power - Sae J1995
1,900 hp / 1,416.8 kW
Hydraulic System Fluid Capacity
140 gal / 530.0 L
Loaded Weight
700,000 lb / 317,515 kg
Max Speed
32.70 mph / 52.6 km/h
Net Power
1,770 hp / 1,320.0 kW
Net Power - 80/1269/Eec
1,791 hp / 1,335.5 kW
Net Power - Iso 9249
1,791 hp / 1,335.5 kW
Net Power - Sae J1349
1,771 hp / 1,320.6 kW
Number Of Gears - Forward
6
Number Of Gears - Reverse
1
Number of Cylinders
16
Operating Voltage
24 V
Planetary Ratio
10.83
Power Measured @
1,750 rpm
Pump Flow - High Idle
193 gal/min / 730.6 L/min
Rear Axle - Empty
53 lb / 24 kg
Rear Axle - Loaded
67 lb / 30 kg
Relief Valve Setting - Raise
2,500 psi / 172.4 bar
Reverse
6.50
Standards
1,473
Steering Standards
1,511
Steering System Fluid Capacity
50 gal / 189.3 L
Stroke
7.50 in / 191 mm
Total Reduction Ratio
25.46
Turning Circle - Clearance Diameter
99.20 ft / 30.24 m
Weight Distribution Front - Empty
47 lb / 21 kg
Weight Distribution Front - Loaded
33 lb / 15 kg
Weight Distribution Rear - Empty
53 lb / 24 kg
Weight Distribution Rear - Loaded
67 lb / 30 kg
Hydraulics
Heaped (Sae 2:1)
137
Lower Time
17.30 sec
Raise Time
18.90 sec
Other
Body Capacity - Sae 2:1
137
Nominal Payload Capacity
390,000 lb / 176,901 kg
Steer Angle
36 deg
Top Speed - Loaded
33 lb / 15 kg
Turning Diameter - Front
90.20 in / 2,291 mm
Body
59,625
Brake Hoist System - Includes Tank
240 gal / 908.5 L
Brake/Hoist Hydraulic Tank
140 gal / 530.0 L
Chassis
225,500
Chassis Weight
218,300 lb / 99,019 kg
Cooling System
175 gal / 662.4 L
Crankcase
77 gal / 291.5 L
Differential - Final Drives
154
Effective Cylinder Stroke - Front
4 in / 102 mm
Effective Cylinder Stroke - Rear
3.50 in / 89 mm
Fuel Tank - Standard
851 gal / 3,221.4 L
Full Liner
20,840
Grid Liner
3,300
Gross Machine Operating Weight
700,000 lb / 317,515 kg
Gross Weight - Empty
310,525 lb / 140,852 kg
Load Capacity - Heaped
145.20 yd³ / 111.01 m³
Net Power
1,874 hp / 1,397.4 kW
Rear - Third Liner
4,200
Side Boards
2,860
Steering System - Including Tank
50 gal / 189.3 L
Steering Tank
34 gal / 128.7 L
Struck
96
Tail Extension
1,700
Torque Converter - Transmission Sump
59 lb-ft / 80 Nm
Torque Converter/Transmission System - Including Sump
20 lb-ft / 27 Nm
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Frequently Asked Questions
How powerful is the Caterpillar 789C Rock Truck engine? +
The Caterpillar 789C Rock Truck produces 1,900 hp (1,416.8 kW) of engine power. This output is typical for its weight class and designed to handle demanding Articulated Dump Truck work cycles efficiently.
How does the Caterpillar 789C Rock Truck compare to similar Articulated Dump Truck models? +
You can compare the Caterpillar 789C Rock Truck side by side with any other model using the Heavy Equipment Hub compare tool. Key comparison points include engine power, operating weight, digging depth, hydraulic flow, and overall dimensions.