• Banner
Open Bowl Scrapers(Non Current)

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.

631E Series II Wheel Tractor-Scraper

The Cat 631E Series II Scraper's rugged construction and easy maintenance assure long life with low operating costs. The scraper bowl design combined with hydraulic ejection provides fast cycle times for high productivity.

  • Specification Summary

  • Caterpillar Net Power366 kW
  • ISO 9249366 kW
  • EEC 80/1269366 kW
  • SAE J1349362 kW
  • Bore137 mm

Product Details

Tractor Engine

Caterpillar Net Power 366 kW
ISO 9249 366 kW
EEC 80/1269 366 kW
SAE J1349 362 kW
Bore 137 mm
Stroke 152 mm
Displacement 18 L

Scraper Bowl

Scraper Capacity: Heaped 23.7 m3
Rated Load 34020 kg
Capacity Struck 16.1 m3
Depth of Cut - max. 437 mm
Width of Cut, to Router Bits 3512 mm
Ground Clearance - max. 545 mm
Cutting Edge - thickness 35 mm
Hyd. Penetration Force - 621G 255 kN
Depth of Spread - max. 480 mm
Apron Opening 2007 mm
Apron Closure Force 170 kN


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 3408E


Operating Weight 44207 kg

Weights - Standard, tandem

Total Shipping 43627 kg
Tractor Shipping 20068 kg
Scraper Shipping 23559 kg
Total Operating - empty 44207 kg
Front Axle 29575 kg
Rear Axle 14632 kg
Total Operating - loaded 78226 kg
Front Axle Weight - loaded 41583 kg
Rear Axle Weight - loaded 36688 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
Front of Tractor to Front Axle 3359 mm
Height – Scraper Blade Maximum 545 mm
Wheelbase 8769 mm
Length - overall machine 14560 mm
Rear Axle to Rear of Machine 2432 mm

Service Refill Capacities – Tractor

Crankcase 45 L
Transmission 127 L
Differential 136 L
Final Drive (per side) 25 L
Cooling System 126 L
Hydraulic Reservoir 190 L
Wheel Coolant (each) 75 L


Width - 180° Turn 12.2 m
Steering Angle – Right 90°
Steering Angle – Left 85°
Hydraulic Output 370 L/min
Ground-Driven Secondary Steering System 200 L/min


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 398 L/min
Scraper Circuit 358 L/min
Cushion Hitch Circuit 38 L/min
Secondary Steering Circuit 291 L/min
Relief Valve - Steering Circuit 13500 kPa
Relief Valve - Implement Circuit 13790 kPa
Compensator Setting - Cushion Hitch Circuit 15858 kPa

Power Train

Proven components combine to deliver the most durable, reliable power train in the industry, keeping costs low and production high.


Proven Cat engines provide the power and torque rise for excellent lugging in tough loading conditions.

Fuel System

The fuel system and Electronic Control Module on the 3408E tractor engine economically and precisely deliver fuel.

Injection Pressures

High injection pressures, independent of engine speed, decrease smoke and emissions while improving response.

Variable Injection Timing

Variable injection timing and duration improve fuel efficiency and cold starting, decrease smoke and emissions.

Injection Rate Shaping

Injection rate shaping reduces emission and engine noise.

Mechanical Parts

Fewer mechanical parts in the fuel system improves reliability.

Electronic Control

Electronic control provides automatic altitude deration and automatic air filter restriction deration.

Multiple Horsepower Ratings

Multiple horsepower ratings limit output in first and second gears unless the operator has the auger or elevator engaged.

Neutral Start Control

Neutral start control prevents engine from starting unless transmission is in neutral.

Throttle Back-up

Throttle back-up provides the operator with a preset engine speed control in the event of a throttle input failure.

Directional Shift Management

Directional shift management prevents the operator from shifting out of neutral when engine rpm is above a preset level.

Controlled Throttle Shifting

Controlled throttle shifting increases drivetrain life by reducing the fuel injection rate just prior to shifting.

Automatic Ether Starting Aid

Automatic ether starting aid greatly improves cold weather starting.

Electronic Ground Level Shutoff

Electronic ground level shutoff enables the operator to stop the engine from the ground with the flip of a switch.

Steel Spacer Plate

Steel spacer plate between the block and head eliminates the need for counterbores and helps prevent associated cracking problems.

Oil-Cooled Pistons

Oil-cooled pistons and full-length water-cooled cylinder liners provide maximum heat transfer for longer component life.


The aftercooler lowers intake charge air temperature to increase power and reduce thermal stresses that can cause premature wear of pistons, rings, and liners.

Engine Oil Cooler

Engine oil cooler maintains optimum oil temperature for proper cooling and longer lubricant life.

Laminated Thermo-Shield

Laminated thermal-shield improves tractor protection by reducing the temperature of exposed engine surfaces, cools engine and operating compartments, extends hose and wiring life.

Optional Retarder

The optional retarder can extend brake life.


Eight-speed power shift transmission provides automatic, on-the-go shifting for simple, reliable operation.

Neutral Coast Inhibitor Control

Neutral coast inhibitor control helps prevent the transmission from shifting to neutral at speeds above 8.1 km/h (5 mph).

Top Gear Control

Top gear control helps prevent shifting above a programmed gear to better regulate haul road speeds.

Electronic Programmable Transmission Control (EPTC II)

Electronic Programmable Transmission Control (EPTC II) records both current and intermittent faults.

Electronically Controlled Cushion Hitch

Smoother ride improves productivity.


The Caterpillar electronically controlled cushion hitch design dampens shocks to provide a smoother ride.

Nitrogen Accumulators

Nitrogen-over-oil accumulators absorb and dampen road shocks.

Cushion Hitch Lock

Electronically controlled cushion hitch locks down for positive control of the cutting edge during loading and dumping.

Double Kingbolt Design

Double kingbolt design withstands high external forces and allows easy installation and removal.

Hitch Castings

Extensive use of steel castings eliminates many welded joints, making a strong hitch.

Scraper Bowl

Low, wide, large-capacity design boosts production.


Wide cutting edge scoops large volume loads from shallow cuts, while the low-profile design of the bowl offers less resistance to incoming materials.


Cellular construction adds strength and dent resistance to bowl sides and floor.

Steel Router

Steel router and edge supports, floor plates and high-abuse components are tempered for strength.

Bulldozer Ejection system

Cat bulldozer ejection system combines constant spreading control with bowl-cleaning efficiency.

Angled Top Plate

Angled top plate on ejector helps retain load.

Auger Mechanism

An auger mechanism in the bowl improves self-loading capabilities by lifting material off of the cutting edge and carrying it to the top of the load.

Operator's Station

Comfort and control increase operator efficiency.


Standard rubber-mounted cab reduces noise and vibration for comfortable, shift-long operation.


Low-effort controls are easily accessible for sure, precise operation.


Hydraulic servo-steering system provides low-effort automotive feel and excellent maneuverability.

Steering Column

Tilt steering column adjusts to five different positions for operator comfort and control.


A suspension seat delivers a comfortable ride.

Electronic Monitoring System

The Electronic Monitoring System checks important machine systems and provides a three-level warning.


The operator's station includes radio compatible wires in the cab.

Multifunction Bowl Lever

Multifunction bowl lever gives operators the ability to control important scraper functions without removing their hands from the bowl lever.

Engine Overspeed Indicator Light

Engine overspeed indicator light and alarm sound when the engine rpm exceeds 2700.


Simplified service means more productive uptime.

Fuel Tank

Scraper-mounted fuel tank improves access to tractor engine compartment.

Wiring Harness

Improved wiring harness incorporates color coded and numbered circuits for quick identification, minimum 10-amp fuses and improved connectors.

Diagnostic Connector

Diagnostic connector, with the aid of a service tool, allows quick analysis of the starting and charging circuits.

O-Ring Face Seals

O-ring face seals help keep these machines 'dry'.

Centralized Lubrication Blocks

Centralized lubrication blocks for the hitch and steering reduce lube time.

Service Points

Service points for the engine are grouped on the right side for easy access.

Service Platforms

Service platforms and numerous handholds improve access and safety.

Parts Availability

Increased component commonality with other Caterpillar scrapers/machines improves parts availability.

Engine Shut-offs

Electronic ground-level engine shut-offs for convenient operator and services areas.


Cat is committed to provide the most dependable machines on the market.

Optional Retarder

The optional retarder extends brake life when working on severe, downhill slopes.


Extensive use of castings in the frame, hitch and bowl provide long service life.

Wiring Harness and Hose Assemblies

Wiring harness and hose assemblies run down the draft arms to eliminate the need for "jump-over" line which can reduce hydraulic system efficiency.


Standard tires provide the maximum flotation of the available options.

Scraper Driveline Guard

Scraper driveline guard protects the output case, differential and ejector cylinder to help minimize driveline maintenance costs.

Laminated Thermo-Shield

Laminated Thermo-Shield helps keep surface temperatures in the engine compartment below the flash point of diesel fuel.

Complete Customer Support

When you buy a Cat machine, you get Caterpillar's total commitment to customer support.

Caterpillar Dealer

Your Caterpillar Dealer offers a wide range of services that can be set up under a customer support agreement when you purchase your equipment.


Make detailed comparisons of the machines you are considering before you buy.


Look past the initial price. Consider the financing options available as well as day-to-day operating costs.


Improving operating techniques can boost your profits. Your Cat dealer has training videotapes, literature and other ideas to help you increase productivity.


More and more equipment buyers are planning for effective maintenance before buying equipment.


Repair, rebuild or replace? Your Cat dealer can help you evaluate the costs involved so you can make the right choice.

Product Support

You will find nearly all parts at our dealer parts counter.

Have a Question?


"Call Back Option available only for UAE, Bahrain, Kuwait, Oman and Qatar."