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Open Bowl Scrapers

Cat Wheel Tractor-Scrapers have the power, traction, and speed for reliable output in a variety of applications. Scraper options include single- and tandem-engine open bowls, tandem engine push-pulls, elevators, and auger arrangements.

631G Scrapers

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Caterpillar® Wheel Tractor-Scrapers to consistently deliver high productivity.

  • Specification Summary

  • Flywheel Power: Tractor/Scraper373 kW (500 hp)
  • Scraper Capacity: Heaped26 m3
  • Top Speed (Loaded)53.5 km/h
  • Tractor EngineC18 ACERT
  • Net Power345/373 kW 462/500 hp
  • Product Brochure


Product Details

Tractor Engine

Flywheel Power: Tractor/Scraper 373 kW (500 hp)
Net Power 345/373 kW 462/500 hp
Gross Power - Gears 1-2 364 kW
Gross Power - Gears 3-8 392 kW
Net Power - Gears 1-2 345 kW
Net Power - Gears 3-8 373 kW
Bore 145 mm
Stroke 183 mm
Displacement 18.1 L

Scraper Bowl

Scraper Capacity: Heaped 26 m3
Rated Load 37285 kg
Capacity Struck 18.3 m3
Depth of Cut - max. 437 mm
Width of Cut, to Router Bits 3512 mm
Ground Clearance - max. 545 mm
Cutting Edge - thickness 28 mm
Hyd. Penetration Force - 631G 255 kN
Depth of Spread - max. 480 mm
Apron Opening 2007 mm
Apron Closure Force 170 kN


Top Speed (Loaded) 53.5 km/h
1 Forward 4.7 km/h
2 Forward 8.4 km/h
3 Forward 11.9 km/h
4 Forward 16.1 km/h
5 Forward 21.6 km/h
6 Forward 29.3 km/h
7 Forward 39.4 km/h
8 Forward 53.5 km/h
Reverse 9.9 km/h


Tractor Engine C18 ACERT


Operating Weight 46475 kg

Weights - Standard, tandem

Total Shipping 45362 kg
Total Operating - empty 46475 kg
Front Axle 31138 kg
Rear Axle 15337 kg
Total Operating - loaded 83760 kg
Front Axle Weight - loaded 44393 kg
Rear Axle Weight - loaded 39367 kg


Width – Overall Machine 3938 mm
Width – Tractor 3481 mm
Width - rear tire center lines 2464 mm
Width – Inside of Bowl 3405 mm
Width – Outside Rear Tires 3636 mm
Height – Overall Shipping 4286 mm
Height – Top of Cab 3715 mm
Ground Clearance – Tractor 665 mm
Front of Tractor to Front Axle 3359 mm
Axle to Vertical Hitch Pin 548 mm
Height – Scraper Blade Maximum 545 mm
Wheelbase 8769 mm
Length - overall machine 14565 mm
Rear Axle to Rear of Machine 2437 mm

Service Refill Capacities – Scraper

Wheel Coolant (each) 75 L

Service Refill Capacities – Tractor

Crankcase 45 L
Fuel Tank - 631G 814 L
Transmission 110 L
Differential 148 L
Final Drive (per side) 23 L
Cooling System 110 L
Hydraulic Reservoir 190 L
Wheel Coolant (each) 75 L
Windshield Washer 6 L


Width - 180° Turn 12.2 m
Steering Angle – Right 90°
Steering Angle – Left 85°


Bowl Cylinder Bore 184 mm
Bowl Cylinder Stroke 873 mm
Apron Cylinder Bore 210 mm
Apron Cylinder Stroke 727 mm
Ejector Cylinder Bore 210 mm
Ejector Cylinder Stroke 1880 mm
Steering Circuit 379 L/min
Scraper Circuit 344 L/min
Cushion Hitch Circuit 34.5 L/min
Secondary Steering Circuit 379 L/min
Relief Valve - Steering Circuit 13700 kPa
Relief Valve - Implement Circuit 14000 kPa
Compensator Setting - Cushion Hitch Circuit 16000 kPa

Transmission - 631G

1 Forward 4.7 km/h
2 Forward 8.4 km/h
3 Forward 11.9 km/h
4 Forward 16.1 km/h
5 Forward 21.6 km/h
6 Forward 29.3 km/h
7 Forward 39.4 km/h
8 Forward 53.5 km/h
Reverse 9.9 km/h

Power Train – Engine

The C18 and C9 engines with ACERT™ Technology work at the point of combustion to optimize engine performance and minimize exhaust emissions. Matched with the torque converter and power shift transmission, they provide years of dependable and efficient service.

Power Train – Transmission

Electronic controls switch from converter drive to direct drive based on gear selection, maximizing efficiency and power application. Tractor and scraper engines are synchronized for smooth operation and longer service life.


Superior structural design delivers stateof- the-art ride, capacity, and material control while assuring the durability and reliability customers expect from Caterpillar.

Operator Station

Convenient control placement and a comfortable work environment are keys to high productivity. Features include electro-hydraulic controls, an available air seat suspension and advanced instrumentation.

Electronic Controls

The electronic controls respond to operator commands and input from on-board sensors to optimize machine performance. In addition, the electronic controls provide advanced diagnostic capabilities that result in better machine availability.

Scraper Bowl

Caterpillar® Scraper bowls are designed for excellent material flow and retention for fast cycle times and high productivity.

Auger Arrangement

Provides self-loading capability with the same wide material appetite as an open bowl machine.


Grouped service points and easy access, the latest electronic monitoring systems and rugged Caterpillar components simplify maintenance and minimize downtime.

Customer Support

Caterpillar dealers have the parts and service capabilities to keep your wheel tractor-scrapers working.

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