Category : Scrapers ➔ Manufacturer : Caterpillar ➔ Model : 631G ➔
The Caterpillar 631G is a wheel tractor-scraper used in earthmoving, mining, road construction, and large-scale site preparation. It is part of Caterpillar's G Series scraper line and is designed for high-volume material loading, hauling, and spreading over medium to long distances. The 631G typically uses a push-pull or push-loading arrangement and is equipped with a large bowl, apron, and ejector system for efficient cut, carry, and dump cycles. Common applications include bulk excavation, embankment construction, and mass grading. The model is known for its heavy-duty frame, traction capability, and productivity in high-production earthmoving operations.
Bowl
Caterpillar 631G Scraper Bowl specifications
Heaped Capacity
31 cu yd
Max Depth Of Cut
17.20 in (43.69 cm)
Rated Payload
75,000.00 lbs (34,019.47 kg)
Struck Capacity
21 cu yd
Width Of Cut
11.60 ft (3.54 m)
Dimensions
Caterpillar 631G Scraper Dimensions specifications
Axle To Vertical Hitch Pin
21.60 in (54.86 cm)
Front Of Tractor To Front Axle
132.25 lb/in
Ground Clearance - Tractor
26.2 lb/in
Height
14.08 ft (4.29 m)
Height - Overall Shipping
167.75 in (426.08 cm)
Height - Scraper Blade Maximum
21.50 in (54.61 cm)
Height - Top Of Cab
146.25 lb/in
Height To Top Of Cab
12.19 ft (3.72 m)
Length
47.75 ft (14.55 m)
Length - Overall Machine
573.40 in (1,456.44 cm)
Overall Height
14.07 ft (4.29 m)
Overall Length
47.78 ft (14.56 m)
Overall Width
12.92 ft (3.94 m)
Rear Axle - Rear Of Machine
95.8 lb/in
Tractor Ground Clearance
2.19 ft (0.67 m)
Weight
102,460.00 lbs (46,475.13 kg)
Wheel Base
345.25 lb/in
Wheelbase
28.77 ft (8.77 m)
Width
12.92 ft (3.94 m)
Width - Inside Of Bowl
134.00 in (340.36 cm)
Width - Outside Rear Tires
143.20 in (363.73 cm)
Width - Overall Machine
155 lb/in
Width - Rear Tire Center Lines
97 lb/in
Width - Tractor
137.00 in (347.98 cm)
Engine
Caterpillar 631G Scraper Engine specifications
Tractor Engine
3408E
Hydraulics
Caterpillar 631G Scraper Hydraulics specifications
Apron Cylinder Bore
8.20 in (20.83 cm)
Apron Cylinder Stroke
28.60 in (72.64 cm)
Bowl Cylinder Bore
7.20 in (18.29 cm)
Bowl Cylinder Stroke
34.40 in (87.38 cm)
Compensator Settings - Cushion Hitch Circuit
2320 psi
Cushion Hitch Circuit
9.00 gpm (34.07 lpm)
Ejector Cylinder Bore
8.30 in (21.08 cm)
Ejector Cylinder Stroke
74.00 in (187.96 cm)
Relief Valve - Implement Circuit
2030 psi
Relief Valve - Steering Circuit
1987 psi
Scraper Circuit
91.00 gpm (344.44 lpm)
Secondary Steering Circuit
77.00 gpm (291.45 lpm)
Steering Circuit
103.00 gpm (389.86 lpm)
Operational
Caterpillar 631G Scraper Operational specifications
Alternator Supplied Amperage
75 amps
Cooling System Fluid Capacity
32.00 gal (121.12 l)
Differential Fluid Capacity
36.00 gal (136.26 l)
Engine Oil Fluid Capacity
11.70 gal (44.28 l)
Fuel Capacity
215.10 gal (814.15 l)
Hydraulic System Fluid Capacity
50.20 gal (190.01 l)
Operating Voltage
24 V
Tire Size
37.50-R35
Transmission Fluid Capacity
33.00 gal (124.91 l)
Wheel Coolant Fluid Capacity - Each
19.80 gal (74.94 l)
Scraper Bowl
Caterpillar 631G Scraper Scraper Bowl specifications
Apron Closure Force
38,250.00 lbs (17,349.93 kg)
Apron Opening
79.00 in (200.66 cm)
Capacity - Struck
21 cu yd
Capacity Heaped
34 cu yd
Cutting Edge Thickness
1.70 in (4.32 cm)
Depth Of Cut - Maximum
17.2 lb/in
Depth Of Spread - Maximum
18.90 in (48.01 cm)
Ground Clearance - Maximum
21.50 in (54.61 cm)
Hyd. Penetration Force - 621g
57,375.00 lbs (26,024.89 kg)
Hyd. Penetration Force - 631g
57,375.00 lbs (26,024.89 kg)
Rated Load
75,000.00 lbs (34,019.47 kg)
Scraper Capacity - Heaped
31 cu yd
Width - Cut - To Router Bits
138.3 lb/in
Service Refill Capacities - Scraper
Caterpillar 631G Scraper Service Refill Capacities - Scraper specifications
Wheel Coolant - Each
19.80 gal (74.94 l)
Service Refill Capacities - Tractor
Caterpillar 631G Scraper Service Refill Capacities - Tractor specifications
Cooling System
32.00 gal (121.12 l)
Crankcase
11.70 gal (44.28 l)
Differential
36.00 gal (136.26 l)
Final Drive - Each
7.00 gal (26.50 l)
Fuel Tank - 631g
215.10 gal (814.15 l)
Hydraulic Reservoir
50.00 gal (189.25 l)
Transmission
33.00 gal (124.91 l)
Wheel Coolant - Each
19.50 gal (73.81 l)
Windshield Washer
6.00 gal (22.71 l)
Standards
Caterpillar 631G Scraper Standards specifications
Brakes
Meets ISO 3450: 1996 standard
Cab
Meets ANSI, SAE
Rops/Fops
Meets SAE J320a, SAE J1040 MAY 94, and ISO 3471-1994
Steering
Caterpillar 631G Scraper Steering specifications
Ground-Driven Secondary Steering System
51.00 gpm (193.04 lpm)
Hydraulic Output
96.20 gpm (364.12 lpm)
Steering Angle - Left
85 degrees
Steering Angle - Right
90 degrees
Width - 180 Degrees Turn
40.10 ft (12.22 m)
Tractor Engine
Caterpillar 631G Scraper Tractor Engine specifications
Bore
5.4 lb/in
Caterpillar Net Power
490.00 hp (365.40 kw)
Displacement
1,099.00 cu in (18,009.42 cu cm)
Eec 80/1269
490.00 hp (365.40 kw)
Flywheel Power - Tractor/Scraper
373 kW (500 hp)
Gross Power
515.00 hp (384.04 kw)
Gross Power - Gears 1-2
480.00 hp (357.94 kw)
Gross Power - Gears 3-8
515.00 hp (384.04 kw)
Iso 9249
490.00 hp (365.40 kw)
Make
Caterpillar
Net Power - Gears 1-2
450.00 hp (335.57 kw)
Net Power - Gears 3-8
490.00 hp (365.40 kw)
Net Power - Tractor/Scraper
336 kW (450 hp)
Sae J1349
490.00 hp (365.40 kw)
Stroke
6 lb/in
Transmission
Caterpillar 631G Scraper Transmission specifications
1 Forward
2.90 mph (4.67 kph)
2 Forward
5.20 mph (8.37 kph)
3 Forward
7.40 mph (11.91 kph)
4 Forward
10.00 mph (16.09 kph)
5 Forward
13.40 mph (21.57 kph)
6 Forward
18.20 mph (29.29 kph)
7 Forward
24.50 mph (39.43 kph)
8 Forward
33.20 mph (53.43 kph)
Max Speed Forward
33.20 mph (53.43 kph)
Max Speed Reverse
6.20 mph (9.98 kph)
Number Of Forward Gears
8
Number Of Reverse Gears
1
Reverse
6.2 mile/h
Top Speed - Loaded
33.00 mph (53.11 kph)
Transmission Type
8-speed automatic Powershift with Electronic Control
Transmission - 631g
Caterpillar 631G Scraper Transmission - 631g specifications
1 Forward
2.90 mph (4.67 kph)
2 Forward
5.20 mph (8.37 kph)
3 Forward
7.40 mph (11.91 kph)
4 Forward
10.00 mph (16.09 kph)
5 Forward
13.40 mph (21.57 kph)
6 Forward
18.20 mph (29.29 kph)
7 Forward
24.50 mph (39.43 kph)
8 Forward
33.20 mph (53.43 kph)
Reverse
6.20 mph (9.98 kph)
Weights
Caterpillar 631G Scraper Weights specifications
Front Axel - Loaded
94,054.00 lbs (42,662.23 kg)
Front Axle - Empty
68647.5 %
Operating Weight
102,460.00 lbs (46,475.13 kg)
Rear Axle - Empty
33812.3 %
Rear Axle - Loaded
83406 %
Total Operating - Empty
102,459.80 lbs (46,475.04 kg)
Total Operating - Loaded
177,460.00 lbs (80,494.60 kg)
Weights - Standard, Tandem
Caterpillar 631G Scraper Weights - Standard, Tandem specifications
Front Axle
68,648.00 lbs (31,138.25 kg)
Front Axle Weight - Loaded
94,054.00 lbs (42,662.23 kg)
Rear Axle
33,812.00 lbs (15,336.88 kg)
Rear Axle - Weight - Loaded
83,406.00 lbs (37,832.37 kg)
Scraper Shipping
54,004.00 lbs (24,495.83 kg)
Total Operating - Empty
102,460.00 lbs (46,475.13 kg)
Total Operating - Loaded
177,460.00 lbs (80,494.60 kg)
Total Shipping
100,006.00 lbs (45,362.01 kg)
Tractor Shipping
46,002.00 lbs (20,866.18 kg)
