Overview
The Caterpillar 631G Motor Scraper is a motor scraper listed in the Heavy Equipment Hub equipment database with structured specifications for comparison, research, and machine selection. Key specification points include engine power of 515 hp, operating weight of 102,460 lb, capacity of 31.0 yd³, travel speed of 33.2 mph, fuel capacity of 215.1 gal and hydraulic capacity of 50.2 gal. This model can be reviewed for high-volume earthmoving, haul road production, cut-and-fill work, and scraper fleet comparison. Use the full specifications table to compare the Caterpillar 631G Motor Scraper against similar motor scraper models by power, weight, capacity, dimensions, speed, and other technical values.
Key Specifications
Operating Weight
102,460
lb
Gross Power
515
hp
Rated Payload
75,000
lb
Overall Length
47.78
in
Full Specifications
119 specs
Dimensions
Axle To Vertical Hitch Pin
21.60 in / 549 mm
Capacity - Struck
21 yd³ / 16.06 m³
Differential Fluid Capacity
36 gal / 136.3 L
Front Axel - Loaded
94,054 lb / 42,662 kg
Front Of Tractor To Front Axle
132.25 in / 3,359 mm
Gross Power
515 hp / 384.0 kW
Ground Clearance - Tractor
26.20 ft / 7.99 m
Height - Overall Shipping
167.75 in / 4,261 mm
Height - Scraper Blade Maximum
21.50 ft / 6.55 m
Height - Top Of Cab
146.25 in / 3,715 mm
Height to Top of Cab
12.19 ft / 3.72 m
Length - Overall Machine
573.40 in / 14,564 mm
Model
3408E
Overall Height
14.07 ft / 4.29 m
Overall Length
47.78 in / 1,214 mm
Overall Width
12.92 ft / 3.94 m
Rated Payload
75,000 lb / 34,019 kg
Rear Axle - Rear Of Machine
95.80 in / 2,433 mm
Total Operating - Empty
102,460 lb / 46,475 kg
Total Operating - Loaded
177,460 lb / 80,495 kg
Tractor Ground Clearance
2.19 ft / 0.67 m
Wheel Base
345.25 in / 8,769 mm
Wheelbase
28.77 ft / 8.77 m
Width - Inside Of Bowl
134 in / 3,404 mm
Width - Outside Rear Tires
143.20 in / 3,637 mm
Width - Overall Machine
155 in / 3,937 mm
Width - Rear Tire Center Lines
97 in / 2,464 mm
Width - Tractor
137 in / 3,480 mm
Width Of Cut
11.60 ft / 3.54 m
Engine
1 Forward
2.90 mph / 4.7 km/h
2 Forward
5.20 mph / 8.4 km/h
3 Forward
7.40 mph / 11.9 km/h
4 Forward
10 mph / 16.1 km/h
5 Forward
13.40 mph / 21.6 km/h
6 Forward
18.20 mph / 29.3 km/h
7 Forward
24.50 mph / 39.4 km/h
8 Forward
33.20 mph / 53.4 km/h
Alternator Supplied Amperage
75 A
Apron Closure Force
38,250 lb / 17,350 kg
Apron Cylinder Bore
8.20 in / 208 mm
Apron Cylinder Stroke
28.60 in / 726 mm
Apron Opening
79
Bore
5.40 in / 137 mm
Bowl Cylinder Bore
7.20 in / 183 mm
Bowl Cylinder Stroke
34.40 in / 874 mm
Capacity Heaped
34
Caterpillar Net Power
490 hp / 365.4 kW
Compensator Settings - Cushion Hitch Circuit
2,320 psi / 160.0 bar
Cooling System Fluid Capacity
32 gal / 121.1 L
Cushion Hitch Circuit
9 gal/min / 34.1 L/min
Depth Of Cut - Maximum
17.20 ft / 5.24 m
Depth Of Spread - Maximum
18.90 ft / 5.76 m
Differential
36
Displacement
1,099 cu in / 18.0 L
Eec 80/1269
490
Ejector Cylinder Bore
8.30 in / 211 mm
Ejector Cylinder Stroke
74 in / 1,880 mm
Engine Oil Fluid Capacity
11.70 gal / 44.3 L
Front Axle
68,648 lb / 31,138 kg
Front Axle - Empty
68,648 lb / 31,138 kg
Front Axle Weight - Loaded
94,054 lb / 42,662 kg
Fuel Capacity
215.10 gal / 814.2 L
Fuel Tank - 631g
215.10 gal / 814.2 L
Gross Power - Gears 1-2
480 hp / 357.9 kW
Gross Power - Gears 3-8
515 hp / 384.0 kW
Ground Clearance - Maximum
21.50 ft / 6.55 m
Ground-Driven Secondary Steering System
51 gal/min / 193.1 L/min
Heaped Capacity
31 yd³ / 23.70 m³
Hyd. Penetration Force - 621g
57,375 lb / 26,025 kg
Hyd. Penetration Force - 631g
57,375 lb / 26,025 kg
Hydraulic Output
96.20 gal/min / 364.2 L/min
Hydraulic Reservoir
50 gal / 189.3 L
Hydraulic System Fluid Capacity
50.20 gal / 190.0 L
Iso 9249
490
Max Depth Of Cut
17.20 ft / 5.24 m
Max Speed Forward
33.20 mph / 53.4 km/h
Max Speed Reverse
6.20 mph / 10.0 km/h
Net Power - Gears 1-2
450 hp / 335.6 kW
Net Power - Gears 3-8
490 hp / 365.4 kW
Number of Forward Gears
8
Number of Reverse Gears
1
Operating Voltage
24 V
Operating Weight
102,460 lb / 46,475 kg
Rated Load
75,000
Rear Axle
33,812 lb / 15,337 kg
Rear Axle - Empty
33,812 lb / 15,337 kg
Rear Axle - Loaded
83,406 lb / 37,832 kg
Rear Axle - Weight - Loaded
83,406 lb / 37,832 kg
Relief Valve - Implement Circuit
2,030 psi / 140.0 bar
Relief Valve - Steering Circuit
1,987 psi / 137.0 bar
Reverse
6.20
Sae J1349
490
Scraper Capacity - Heaped
31
Scraper Circuit
91 gal/min / 344.5 L/min
Scraper Shipping
54,004
Secondary Steering Circuit
77 gal/min / 291.5 L/min
Steering
Width - 180 Degrees Turn
Steering Circuit
103 gal/min / 389.9 L/min
Stroke
6 in / 152 mm
Struck Capacity
21 yd³ / 16.06 m³
Total Shipping
100,006
Tractor Engine
3,408
Tractor Shipping
46,002
Transmission
1 Forward
Transmission - 631g
1
Transmission Fluid Capacity
33 gal / 124.9 L
Transmission Type
8-speed automatic Powershift with Electronic Control
Wheel Coolant - Each
19.80
Wheel Coolant Fluid Capacity - Each
19.80 gal / 75.0 L
Width - 180 Degrees Turn
40.10 in / 1,019 mm
Width - Cut - To Router Bits
138.30 in / 3,513 mm
Windshield Washer
6
Hydraulics
Cutting Edge Thickness
1.70
Other
Rops/Fops
320
Top Speed - Loaded
33 lb / 15 kg
Brakes
Meets ISO 3450: 1996 standard
Cooling System
32 gal / 121.1 L
Crankcase
11.70 gal / 44.3 L
Final Drive - Each
7
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Frequently Asked Questions
What is the operating weight of the Caterpillar 631G Motor Scraper? +
The Caterpillar 631G Motor Scraper has an operating weight of 102,460 lb (46,475 kg). This places it in a class suited for motor scraper applications where ground pressure and transport weight are key considerations.
How powerful is the Caterpillar 631G Motor Scraper engine? +
The Caterpillar 631G Motor Scraper produces 515 hp (384.0 kW) of engine power. This output is typical for its weight class and designed to handle demanding Motor Scraper work cycles efficiently.
How does the Caterpillar 631G Motor Scraper compare to similar Motor Scraper models? +
You can compare the Caterpillar 631G Motor Scraper 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.