Skip to main content

631K (Tier 2/Stage II)

  • 631K (Tier 2/Stage II) - Open Bowl Scrapers

631K (Tier 2/Stage II)

Overall Shipping Height
3.89 m
Maximum Depth of
535 mm
Tires - Tractor
Fuel Tank Refill
874 l


Related Materials
File Format Size
631K Product Brochure pdf 113.78 KiB


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.Brakes – 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.


Standard Equipment
Overall Shipping Height 3.89 m
Maximum Depth of Spread 535 mm
Tires - Tractor 37.25R35**E3
Fuel Tank Refill Capacity - Scraper 874 l
Scraper Capacity - Struck 18.3 m³
Scraper Capacity - Heaped 26 m³
Top Speed - Loaded 55.8 km/h
Overall Width 3.94 m
Maximum Depth of Cut 450 mm
Width - Cut 3.51 m
180° Curb-to-Curb Turning Width 12.23 m
Rated Load 37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons)
Tires - Scraper 37.25R35**E3
Standard Equipment
Rated Engine RPM - Tractor 1900 r/min
Engine Model - Tractor Cat C18 ACERT™
Emissions Cat C18 ACERT engine meets U.S. EPA Tier 2/EU Stage II Equivalent emission standards.
Flywheel Power - Tractor 425 kW
Standard Equipment
Flywheel Power - Tractor/Scraper 425 kW
Standard Equipment
Scraper Capacity - Heaped 26 m³
Standard Equipment
Top Speed - Loaded 55.8 km/h
Standard Equipment
Crankcase - Tractor 52 l
Transmission System 110 l
Fuel Tank 874 l
Hydraulic System 142 l
Cooling System 75 l
Standard Equipment
Front of Tractor to Front Axle 3612 mm
Axle to Vertical Hitch Pin 509 mm
Wheel Base 8808 mm
Rear Axle - Rear of Machine 2744 mm
Ground Clearance - Tractor 664 mm
Width - Outside Rear Tires 3636 mm
Width - Inside of Bowl 3404 mm
Width - Rear Tire Centers 2462 mm
Height - Scraper Blade Maximum 510 mm
Height - Top of Cab 3733 mm
Length - Maximum (Push-Pull) 16640 mm
Height - Overall Shipping 3892 mm
Width - Overall Machine 3937 mm
Length - Overall Machine - Standard 15164 mm
Width - Tractor 3499 mm
Standard Equipment
Operating Weight - Empty 46600 kg
Overall Length 15.04 m
Standard Equipment
Overall Length - With Bail Down 16.64 m
Operating Weight - Empty 48275 kg
Standard Equipment
Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
ROPS/FOPS ROPS/FOPS meet “ISO Standards.”
Standard Equipment
Reverse Alarm ISO 9533:2010
Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II
Seat Belt SAE J386:FEB2006
Rollover Protection Structure (ROPS) ISO 3471:2008 for up to 21 282 kg (46,919 lb)
Brakes Brakes ISO 3450:2011
Steering System ISO 5010:2007
Standard Equipment
Transmission Gear - First 5.5 km/h
Transmission Gear - Fourth 16.9 km/h
Transmission Gear - Sixth 30.6 km/h
Transmission Gear - Third 12.4 km/h
Transmission Gear - Fifth 22.7 km/h
Transmission Gear - Seventh 41.4 km/h
Transmission Gear - Reverse 9.9 km/h
Transmission Gear - Eighth 55.8 km/h
Transmission Gear - Second 10 km/h
Standard Equipment
Bowl Raise 3.5 s
Bail Lower 2.1 s
Apron Raise 4 s
Ejector Extend 8.5 s
Bowl Lower 3.5 s
Bail Raise 1.5 s
Ejector Retract 8.5 s
Apron Lower 3.8 s