< Back

Financing & Insurance
See our Offers
View Product Downloads
Yes, I would like to receive future marketing communications (such as email) from Caterpillar Inc., its affiliates and subsidiaries worldwide and the Caterpillar dealer network. Regardless of whether you decide to receive these marketing communications, Caterpillar will continue to send service/transactional messages, including those that have to do with any accounts that you may have with us.

Overview

631G Wheel Tractor Scrapers

Engine

Units:
Tractor Engine C18 ACERT C18 ACERT Less

Tractor Engine

Flywheel Power: Tractor/Scraper 373 kW (500 hp) 373 kW (500 hp) Less
Net Power 345/373 kW 462/500 hp 345/373 kW 462/500 hp Less
Gross Power - Gears 1-2 488.0 hp 364.0 kW Less
Gross Power - Gears 3-8 526.0 hp 392.0 kW Less
Net Power - Gears 1-2 462.0 hp 345.0 kW Less
Net Power - Gears 3-8 500.0 hp 373.0 kW Less
Bore 5.7 in 145.0 mm Less
Stroke 7.2 in 183.0 mm Less
Displacement 1105.0 in3 18.1 L Less

Scraper Bowl

Scraper Capacity: Heaped 34.0 yd3 26.0 m3 Less
Rated Load 82200.0 lb 37285.0 kg Less
Capacity Struck 24.0 yd3 18.3 m3 Less
Depth of Cut - max. 17.2 in 437.0 mm Less
Width of Cut, to Router Bits 138.3 in 3512.0 mm Less
Ground Clearance - max. 21.5 in 545.0 mm Less
Cutting Edge - thickness 1.12 in. 28.0 mm Less
Hyd. Penetration Force - 631G 57375.0 lb 255.0 kN Less
Depth of Spread - max. 18.9 in 480.0 mm Less
Apron Opening 79.0 in 2007.0 mm Less
Apron Closure Force 38250.0 lb 170.0 kN Less

Transmission

Top Speed (Loaded) 33.0 mph 53.5 km/h Less
1 Forward 2.9 mph 4.7 km/h Less
2 Forward 5.2 mph 8.4 km/h Less
3 Forward 7.4 mph 11.9 km/h Less
4 Forward 10.0 mph 16.1 km/h Less
5 Forward 13.4 mph 21.6 km/h Less
6 Forward 18.2 mph 29.3 km/h Less
7 Forward 24.5 mph 39.4 km/h Less
8 Forward 33.2 mph 53.5 km/h Less
Reverse 6.2 mph 9.9 km/h Less

Hydraulics

Bowl Cylinder Bore 7.2 in 184.0 mm Less
Bowl Cylinder Stroke 34.4 in 873.0 mm Less
Apron Cylinder Bore 8.2 in 210.0 mm Less
Apron Cylinder Stroke 28.6 in 727.0 mm Less
Ejector Cylinder Bore 8.2 in 210.0 mm Less
Ejector Cylinder Stroke 74.0 in 1880.0 mm Less
Steering Circuit 100.0 gal/min 379.0 L/min Less
Scraper Circuit 91.0 gal/min 344.0 L/min Less
Cushion Hitch Circuit 9.0 gal/min 34.5 L/min Less
Secondary Steering Circuit 100.0 gal/min 379.0 L/min Less
Relief Valve - Steering Circuit 1987.0 psi 13700.0 kPa Less
Relief Valve - Implement Circuit 2030.0 psi 14000.0 kPa Less
Compensator Setting - Cushion Hitch Circuit 2320.0 psi 16000.0 kPa Less

Steering

Width - 180° Turn 40.02 ft 12.2 m Less
Steering Angle – Right 90° 90° Less
Steering Angle – Left 85° 85° Less

Service Refill Capacities – Tractor

Crankcase 11.9 gal 45.0 L Less
Fuel Tank - 631G 215.04 gal 814.0 L Less
Transmission 29.0 gal 110.0 L Less
Differential 39.0 gal 148.0 L Less
Final Drive (per side) 6.1 gal 23.0 L Less
Cooling System 29.0 gal 110.0 L Less
Hydraulic Reservoir 50.2 gal 190.0 L Less
Wheel Coolant (each) 19.8 gal 75.0 L Less
Windshield Washer 1.5 gal 6.0 L Less

Service Refill Capacities – Scraper

Wheel Coolant (each) 19.8 gal 75.0 L Less

Dimensions

Width – Overall Machine 155.0 in 3938.0 mm Less
Width – Tractor 137.0 in 3481.0 mm Less
Width - rear tire center lines 97.0 in 2464.0 mm Less
Width – Inside of Bowl 134.0 in 3405.0 mm Less
Width – Outside Rear Tires 143.2 in 3636.0 mm Less
Height – Overall Shipping 168.8 in 4286.0 mm Less
Height – Top of Cab 146.3 in 3715.0 mm Less
Ground Clearance – Tractor 26.2 in 665.0 mm Less
Front of Tractor to Front Axle 132.2 in 3359.0 mm Less
Axle to Vertical Hitch Pin 21.6 in 548.0 mm Less
Height – Scraper Blade Maximum 21.5 in 545.0 mm Less
Wheelbase 345.2 in 8769.0 mm Less
Length - overall machine 573.4 in 14565.0 mm Less
Rear Axle to Rear of Machine 96.0 in 2437.0 mm Less

Weights - Standard, tandem

Total Shipping 100005.97 lb 45362.0 kg Less
Total Operating - empty 102459.71 lb 46475.0 kg Less
Front Axle 68647.46 lb 31138.0 kg Less
Rear Axle 33812.26 lb 15337.0 kg Less
Total Operating - loaded 184658.97 lb 83760.0 kg Less
Front Axle Weight - loaded 97869.7 lb 44393.0 kg Less
Rear Axle Weight - loaded 86789.28 lb 39367.0 kg Less

Weights

Operating Weight 102459.71 lb 46475.0 kg Less

Transmission - 631G

1 Forward 2.9 mph 4.7 km/h Less
2 Forward 5.2 mph 8.4 km/h Less
3 Forward 7.4 mph 11.9 km/h Less
4 Forward 10.0 mph 16.1 km/h Less
5 Forward 13.4 mph 21.6 km/h Less
6 Forward 18.2 mph 29.3 km/h Less
7 Forward 24.5 mph 39.4 km/h Less
8 Forward 33.2 mph 53.5 km/h Less
Reverse 6.2 mph 9.9 km/h Less

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.


Structures

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.


Serviceability

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.