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631K Wheel Tractor-Scraper
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Standard Equipment

Travel Speeds (Runout)

Transmission Gear: Eighth
34.7 mph
Transmission Gear: Fifth
14.1 mph
Transmission Gear: First
3.4 mph
Transmission Gear: Fourth
10.5 mph
Transmission Gear: Reverse
6.2 mph
Transmission Gear: Second
6.2 mph
Transmission Gear: Seventh
25.7 mph
Transmission Gear: Sixth
19.0 mph
Transmission Gear: Third
7.7 mph


Exterior Sound Level
The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
ROPS/FOPS meet “ISO Standards.”

Scraper Bowl

Scraper Capacity: Heaped
34 yd3

General Data

180° Curb-to-Curb Turning Width
40.12 ft
Fuel Tank Refill Capacity: Scraper
231 gal
Maximum Depth of Cut
17.7 in
Maximum Depth of Spread
21.1 in
Overall Shipping Height
12.75 ft
Overall Width
12.93 ft
Rated Load
37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons)
Scraper Capacity: Heaped
34 yd3
Scraper Capacity: Struck
24 yd3
Tires: Scraper
Tires: Tractor Drive
Top Speed (Loaded)
34.7 mph
Width of Cut
11.50 ft

Safety Criteria Compliance Standards

Brakes ISO 3450:2011
Falling Object Protective Structure (FOPS)
ISO 3449:2005 Level II
Reverse Alarm
ISO 9533:2010
Rollover Protection Structure (ROPS)
ISO 3471:2008 for up to 21 282 kg (46,919 lb)
Seat Belt
SAE J386:FEB2006
Steering System
ISO 5010:2007


Width – Overall Machine
155 in
Width – Tractor
137.8 in
Width – Inside of Bowl
134 in
Width – Outside Rear Tires
143.2 in
Height – Overall Shipping
153.2 in
Height – Top of Cab
147 in
Ground Clearance – Tractor
26.1 in
Front of Tractor to Front Axle
142.2 in
Axle to Vertical Hitch Pin
20 in
Height – Scraper Blade Maximum
20 in
346.8 in
Rear Axle to Rear of Machine
108 in
Length – Maximum (Push-Pull)
655.1 in
Length – Overall Machine (Standard)
597 in
Width – Rear Tire Centers
96.9 in


Operating Weight (Empty)
106430 lb
Overall Length (With Bail Down)
54.59 ft


Top Speed (Loaded)
34.7 mph

Non Push-Pull

Operating Weight (Empty)
102750 lb
Overall Length
49.34 ft

Tractor Engine

Flywheel Power: Tractor/Scraper

Implement Cycle Times

Apron Lower
3.8 Seconds
Apron Raise
4.0 Seconds
Bail Lower
2.1 Seconds
Bail Raise
1.5 Seconds
Bowl Lower
3.5 Seconds
Bowl Raise
3.5 Seconds
Ejector Extend
8.5 Seconds
Ejector Retract
8.5 Seconds

Service Refill Capacities

Cooling System: Tractor
19.8 gal
Crankcase: Tractor
13.7 gal
Fuel Tank
231 gal
Hydraulic System
37.5 gal
Transmission System: Tractor
29 gal


Engine Model: Tractor
Cat C18 ACERT™
Flywheel Power: Tractor
570 hp
Cat C18 ACERT engine meets U.S. EPA Tier 2/EU Stage II Equivalent emission standards.
Rated Engine RPM: Tractor
1900 RPM
Main Features and Benefits

Main Features and Benefits

Tractor Serviceability Improvement

The fuel, water and engine oil are relocated at ground level on the right hand side of the machine for easy access.


Have been changed from an air actuated drum shoe brake to a hydraulic actuated tractor wet disc brake and a scraper dry caliper.

Tire Spin Reduction

This feature will allow the machine to control the slip of the tractor tires only.

Engine Over Speed Protection

In the event of an engine over speed situation, the compression brake or brakes will automatically engage with no operator input. The machine determines the over speed condition based on rate of acceleration and applies compression brakes automatically.

Advanced Cushion Hitch

With similar technology as the Cat® Advanced Ride Management seat suspension, this software allows the cushion hitch to prevent end stroke by having the ability to predict end stroke events and manage the rate of dampening. Resulting in reduced hitch maintenance and improved operator ride in rough conditions.

High Pressure Steering

K Series steering system design requires significantly less steering effort. The reduced steering effort will allow for decreased operator fatigue and a more efficient operator resulting in possible higher rates of production late in the work cycle.

Differential Lock Engagement Protection

This standard feature allows the machine to prevent the operator from engaging the differential lock when damage could occur.

Cab Improved

The K Series cab interior improves operator comfort and visibility. The overall interior is 21% larger than the G Series cab.

Machine Speed Limit

This feature is designed to take the place of top gear selection. If the machine top speed needs to be limited the operator can select the top speed through the display or the top speed can be set in ET. This will allow the machine to find the correct gear that works best for the engine and transmission. Allowing the engine and transmission to select the correct gear to pull the load in most cases resulting in a lower engine load factor and lower fuel burn verses using top gear selection that required the machine to run at engine speeds at or close to high idle.

Ground Speed Control

Ground Speed Control sets the desired top speed by the operator if job site conditions or segment speed limits require a speed less than full run out. Machine Speed Limit is intended for use when top speed needs to be limited for longer durations and Ground Speed Control is intended for use when the top speed needs to be reduced for shorter segments or intermediate periods of time. The operator can set the desired top speed and the machine will find the correct gear that works best for the engine and transmission.

Sequence Assist (Optional Attachment)

This option uses cylinder position sensors to automate bowl, apron and further implement controls throughout the four core work cycles: Dig, Haul, Unload and Return. When utilized this can reduce up to 14 individual operator commands per cycle. Sequence Assist simplifies control over the implements, reduces joystick usage, automatically controls cushion hitch, transmission hold and ejector.

Payload Estimator (Optional Attachment)

The Payload Estimator will calculate the payload of the machine in tonnes or tons by measuring the bowl lift cylinder pressures at the beginning of the loaded haul segment. This feature works best when using Sequence Assist. Using Payload Estimator during testing has achieved better than 95% accuracy when compared to actual scale weights. The Payload Estimator feature comes automatically when a machine is ordered with Sequence Assist.

Load Assist (Optional Attachment)

Is designed to help shorten the learning curve of inexperienced operators to ensure consistency and faster loading of material while reducing effort of the operator. Based on the speed of the machine, Load Assist automatically adjusts the cutting edge height to manage wheel slip and to ensure consistent and efficient loading in bulk earthmoving applications.

Cat Grade Control (Optional Attachment)

Intelligently ensures the machine does not cut below grade in the cut area or over fill in the fill area – avoiding rework and moving unnecessary material.