631K (Tier 4 Final/Stage IV)

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631K Wheel Tractor-Scraper


Tires - Scraper 37.25R35**E3 37.25R35**E3 Less
Rated Load 37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons) 37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons) Less
Scraper Capacity - Struck 24.0 yd³ 18.3 m³ Less
Tires - Tractor 37.25R35**E3 37.25R35**E3 Less
Maximum Depth of Cut 17.7 in 450.0 mm Less
Width - Cut 11.5 ft 3.51 m Less
Scraper Capacity - Heaped 34.0 yd³ 26.0 m³ Less
Overall Width 12.93 ft 3.94 m Less
Top Speed - Loaded 34.7 mile/h 55.8 km/h Less
Fuel Tank Refill Capacity - Scraper 231.0 gal (US) 874.0 l Less
Overall Shipping Height 12.75 ft 3.89 m Less
180° Curb-to-Curb Turning Width 40.12 ft 12.23 m Less
Maximum Depth of Spread 21.1 in 535.0 mm Less


Flywheel Power - Tractor 570.0 HP 425.0 kW Less
Rated Engine RPM - Tractor 1900.0 r/min 1900.0 r/min Less
Engine Model - Tractor Cat C18 ACERT™ Cat C18 ACERT™ Less
Emissions Cat C18 ACERT engine meets U.S. EPA Tier 4 Final/EU Stage IV emission standards. Cat C18 ACERT engine meets U.S. EPA Tier 4 Final/EU Stage IV emission standards. Less

Tractor Engine

Flywheel Power - Tractor/Scraper 570.0 HP 425.0 kW Less

Scraper Bowl

Scraper Capacity - Heaped 34.0 yd³ 26.0 m³ Less


Top Speed - Loaded 34.7 mile/h 55.8 km/h Less

Service Refill Capacities

Fuel Tank 231.0 gal (US) 874.0 l Less
Hydraulic System 37.5 gal (US) 142.0 l Less
Diesel Exhaust Fluid (DEF) 8.0 gal (US) 30.5 l Less
Cooling System 19.8 gal (US) 75.0 l Less
Crankcase - Tractor 13.7 gal (US) 52.0 l Less
Transmission System 29.0 gal (US) 110.0 l Less


Front of Tractor to Front Axle 142.2 in 3612.0 mm Less
Axle to Vertical Hitch Pin 20.0 in 509.0 mm Less
Wheel Base 346.8 in 8808.0 mm Less
Rear Axle - Rear of Machine 108.0 in 2744.0 mm Less
Height - Scraper Blade Maximum 20.0 in 510.0 mm Less
Ground Clearance - Tractor 26.1 in 664.0 mm Less
Length - Overall Machine - Standard 597.0 in 15164.0 mm Less
Length - Maximum (Push-Pull) 655.1 in 16640.0 mm Less
Width - Tractor 137.8 in 3499.0 mm Less
Height - Top of Cab 147.0 in 3733.0 mm Less
Width - Rear Tire Centers 96.9 in 2462.0 mm Less
Width - Overall Machine 155.0 in 3937.0 mm Less
Width - Outside Rear Tires 143.2 in 3636.0 mm Less
Width - Inside of Bowl 134.0 in 3404.0 mm Less
Height - Overall Shipping 153.2 in 3892.0 mm Less

Non Push-Pull

Overall Length 49.34 ft 15.04 m Less
Operating Weight - Empty 102750.0 lb 46600.0 kg Less


Overall Length - With Bail Down 54.59 ft 16.64 m Less
Operating Weight - Empty 106430.0 lb 48275.0 kg Less


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

Safety Criteria Compliance Standards

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

Travel Speeds - Runout

Transmission Gear - Sixth 19.0 mile/h 30.6 km/h Less
Transmission Gear - Seventh 25.7 mile/h 41.4 km/h Less
Transmission Gear - Reverse 6.2 mile/h 9.9 km/h Less
Transmission Gear - Fourth 10.5 mile/h 16.9 km/h Less
Transmission Gear - Eighth 34.7 mile/h 55.8 km/h Less
Transmission Gear - First 3.4 mile/h 5.5 km/h Less
Transmission Gear - Fifth 14.1 mile/h 22.7 km/h Less
Transmission Gear - Third 7.7 mile/h 12.4 km/h Less
Transmission Gear - Second 6.2 mile/h 10.0 km/h Less

Implement Cycle Times

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

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.

631K (Tier 4 Final/Stage IV) Standard Equipment

  • Cat C18 ACERT engine with MEUI™
  • Compression engine brake
  • Electric start, 24V
  • Air cleaner, dry type with precleaner
  • Fan, hydraulic
  • Ground level engine shutdown
  • Radiator, aluminum unit core, 9 fins per inch
  • Guard, crankcase
  • Starting aid, ether
  • Braking system:
    • Primary and secondary, wet disc, hydraulic
    • Parking, hydraulic-released, spring-applied
    • Throttle lock
  • Transmission:
    • 8-speed planetary power shift
    • ECPC control
    • APECS software
    • Programmable top gear selection
    • Transmission hold
    • Differential lock
    • Guard, power train
    • Standard tire spin reduction
    • Ground speed control
    • Machine speed limit
    • Differential lock protection

  • Braking system:
    • Primary and secondary, dry caliper, hydraulic actuated

  • Alternator, 150 Amp
  • Batteries (4), 12V, 1,000 CCA, maintenance free, high output
  • Electrical system, 24V
  • Lighting system:
    • Headlights, LED
    • Turn signals with hazard function, LED floodlights, (2) cutting edge (1) bowl, halogen side vision (2)
  • Starting/charging receptacle

  • Alarm, backup
  • Lighting system:
    • Brake lights, LED
    • Turn signals with hazard function, LED

  • HVAC system, heat, AC, defrost
  • Thermostat control of HVAC system
  • Coat hook
  • Lunchbox platform with holding strap
  • Diagnostic connection (2)
  • 12V power ports (2)
  • Differential lock (1)
  • Dome courtesy light
  • Horn, electric
  • T-Handle implement control
  • Mirror, rearview
  • Radio ready
  • ROPS/FOPS cab, pressurized
  • Keypad switches:
    • Throttle lock
    • Wipers/washers
    • Hazard lights
    • Retarding level select
    • Work lights on, off
    • Information mode on Messenger Display
  • Safety tab rocker switches
  • Seat belt, static two-piece
  • Seat, Cat Advanced Ride Management (ARM), Cat Comfort Series 3, rotates 30 degrees
  • Steering wheel, tilt, telescoping, padded
  • Windows, right side emergency egress
  • Windows, sliding
  • Windows, laminated, zipped in
  • Windshield wipers, front and rear windows, includes washers
  • Door lock
  • Messenger Display
  • Gauges, warnings include:
    • Coolant temperature
    • Engine oil temperature
    • Hydraulic oil temperature
    • Diesel Particulate Filter (DPF) temperature
    • Fuel level
    • Park brake
    • Implement lockout
    • Brake system
    • Regeneration required
    • Throttle lock
    • System voltage
    • Secondary steering
    • Bail down
    • Ejector auto
    • Differential lock
    • Apron float
    • Transmission hold
    • Cushion hitch
    • High beam lights
    • Action lamp
    • Engine speed, rpm
    • Gear selection
    • DEF fill levels

  • Extended Life Coolant to –37° C (–34° F)

  • Advanced cushion hitch
  • Accumulators (cushion hitch) with Canadian Registration Number (CRN)
  • Fast oil change
  • Fenders, non-metallic
  • Heater, engine coolant 120V
  • Rims (2)
  • Tow hooks, front
  • Vandalism locks
  • Heater, engine coolant 120V
  • Steering locks

  • Bowl:
    • 18.3 m3 (24 yd3), struck
    • 26 m3 (34 yd3), heaped
  • Vandalism locks
  • Rims (2)
  • Hydraulic position sensing cylinders (bowl lift and apron)

631K (Tier 4 Final/Stage IV) Optional Equipment

  • Secondary Steering Arrangement

  • Sequence Assist Arrangement with Payload Estimator
  • Load Assist
  • Cat Grade Control with Load Assist
  • Advanced Tire Spin Reduction

  • Camera arrangement – Work Area Vision System (WAVS)
  • Cab beacon
  • Air horn
  • Air horn and beacon
  • Fender, scraper
  • Guard, overflow
  • Wiring group
  • Push Pull

  • Film arrangement – U.S. (ANSI)
  • Film arrangement – International (ISO)