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Open Bowl Scrapers

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.

637K Wheel Tractor-Scraper

  • Specification Summary

  • Flywheel Power: Tractor/Scraper425
  • Scraper Capacity: Heaped26 m3
  • Top Speed (Loaded)55.8 km/h
  • Engine Model: ScraperCat C9.3 ACERT
  • Engine Model: TractorCat C18 ACERT™
  • Product Brochure


Product Details

Tractor Engine

Flywheel Power: Tractor/Scraper 425

Scraper Bowl

Scraper Capacity: Heaped 26 m3


Top Speed (Loaded) 55.8 km/h


Engine Model: Scraper Cat C9.3 ACERT
Engine Model: Tractor Cat C18 ACERT™
Flywheel Power: Scraper 216 kW
Flywheel Power: Tractor 425 kW
Note Cat C9.3 ACERT and C18 ACERT engines meet U.S. EPA Tier 4 Final/EU Stage IV emission standards.
Rated Engine RPM: Scraper 2150 RPM
Rated Engine RPM: Tractor 1900 RPM


Width – Overall Machine 3937 mm
Width – Tractor 3499 mm
Width – Inside of Bowl 3404 mm
Width – Outside Rear Tires 3636 mm
Height – Overall Shipping 4145 mm
Height – Top of Cab 3733 mm
Ground Clearance – Tractor 664 mm
Front of Tractor to Front Axle 3612 mm
Axle to Vertical Hitch Pin 509 mm
Height – Scraper Blade Maximum 510 mm
Wheelbase 8808 mm
Rear Axle to Rear of Machine 2292 mm
Length – Maximum (Push-Pull) 16640 mm
Length – Overall Machine (Standard) 15164 mm
Width – Overall Machine – Ladder Down 2744 mm
Width – Rear Tire Centers 2462 mm

Travel Speeds (Runout)

Transmission Gear: Eighth 55.8 km/h
Transmission Gear: Fifth 22.7 km/h
Transmission Gear: First 5.5 km/h
Transmission Gear: Fourth 16.9 km/h
Transmission Gear: Reverse 9.9 km/h
Transmission Gear: Second 10.0 km/h
Transmission Gear: Seventh 41.95 km/h
Transmission Gear: Sixth 30.6 km/h
Transmission Gear: Third 12.4 km/h


Operating Weight (Empty) 54005 kg
Overall Length (With Bail Down) 16.64 m

General Data

180° Curb-to-Curb Turning Width 12.23 m
Fuel Tank Refill Capacity: Scraper 1400 L
Maximum Depth of Cut 450 mm
Maximum Depth of Spread 535 mm
Overall Shipping Height 4.15 m
Overall Width 3.94 m
Rated Load 37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons)
Scraper Capacity: Heaped 26 m3
Scraper Capacity: Struck 18.3 m3
Tires: Scraper 37.25R35**E3
Tires: Tractor Drive 37.25R35**E3
Top Speed (Loaded) 55.8 km/h
Width of Cut 3.51 m


Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393) is 116 dB(A).
ROPS/FOPS ROPS/FOPS meet “ISO Standards.”

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: Scraper 61 L
Cooling System: Tractor 75 L
Crankcase: Scraper 24.5 L
Crankcase: Tractor 52 L
Diesel Exhaust Fluid: Scraper 22 L
Diesel Exhaust Fluid: Tractor 30.5 L
Fuel Tank 1400 L
Hydraulic System 142 L
Transmission System: Scraper 49 L
Transmission System: Tractor 110 L

Non Push-Pull

Operating Weight (Empty) 52140 kg
Overall Length 15.04 m

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

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.

Fuel Economy Mode

This is a two part feature when selected. The first part of the feature lowers the transmission shift points allowing shifting to take place at lower rpms to aid in fuel savings. The second part of the Fuel Economy Mode allows the machine when operated at engine rpms less than full throttle to automatically vary the power distribution between the tractor and the scraper.

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.
    •  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:<ul><li>Primary and secondary, wet disc, hydraulic actuated</li><li>Parking, hydraulic-released, spring-applied</li></ul>
    •  Throttle lock
    •  Transmission:<ul><li>8-speed planetary power shift</li><li>ECPC control</li><li>APECS software</li><li>Programmable top gear selection</li><li>Transmission hold</li><li>Differential lo
    •  Cat C9.3 ACERT engine:<ul><li>High pressure common rail fuel</li><li>Constant lift engine brake</li></ul>
    •  Electric start, 24V
    •  Air cleaner, dry type with precleaner
    •  Fan, mechanical driven
    •  Ground level engine shutdown
    •  Radiator, aluminum unit core, 9 fins per inch
    •  Starting aid, either
    •  Braking system:<ul><li>Primary and secondary, dry caliper, hydraulic actuated</li></ul>
    •  Transmission:<ul><li>4-speed (torque converter drive)</li><li>Planetary power shift</li></ul>
  • Cat C9.3 ACERT engine:
    • High pressure common rail fuel
    • Constant lift engine brake
    • Electric start, 24V
      • Air cleaner, dry type with precleaner
        • Fan, mechanical driven
          • Ground level engine shutdown
            • Radiator, aluminum unit core, 9 fins per inch
              • Starting aid, either
                • Braking system:
                  • Primary and secondary, dry caliper, hydraulic actuated
                  • Transmission:
                    • 4-speed (torque converter drive)
                    • Planetary power shift
                    • ELECTRICAL – TRACTOR
                      •  Alternator, 150 Amp
                      •  Batteries (4), 12V, 1,000 CCA, maintenance free, high output
                      •  Electrical system, 24V
                      •  Lighting system:<ul><li>Headlights, LED</li><li>Turn signals with hazard function, LED floodlights, (2) cutting edge (1) bowl, halogen side vision (2)</li></ul>
                      •  Starting/charging receptacle
                    • 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
                              • ELECTRICAL – SCRAPER
                                •  Alarm, backup
                                •  Batteries (4) 12V, 1,000 CCA, maintenance free, high output
                                •  Alternator, 65 Amp
                                •  Electrical system, 24V
                                •  Lighting system:<ul><li>Brake lights, LED</li><li>Turn signals with hazard function, LED</li></ul>
                              • OPERATOR ENVIRONMENT – TRACTOR
                                •  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:<ul><li>Throttle lock</li><li>Wipers/washers</li><li>Hazard lights</li><li>Retarding level select</li><li>Work lights on, off</li><li>Information mode on Messenger Disp
                                •  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:<ul><li>Coolant temperature</li><li>Engine oil temperature</li><li>Hydraulic oil temperature</li><li>Diesel Particulate Filter (DPF) temperature</li><li>Fuel level</li&
                              • FLUIDS
                                •  Extended Life Coolant to –37° C (–34° F)
                              • OTHER STANDARD EQUIPMENT – TRACTOR
                                •  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
                              • OTHER STANDARD EQUIPMENT – SCRAPER
                                •  Bowl:<ul><li>18.3 m3 (24 yd3), struck</li><li>26 m3 (34 yd3), heaped</li></ul>
                                •  Vandalism locks
                                •  Scraper fenders
                                •  Overflow guard
                                •  Fast oil change
                                •  Rims (2)
                                •  Hydraulic position sensing cylinders (bowl lift and apron)
                              • STEERING ARRANGEMENTS
                                •  Secondary Steering Arrangement
                              • Secondary Steering Arrangement
                                • INTEGRATED TECHNOLOGIES
                                  •  Sequence Assist Arrangement with Payload Estimator
                                  •  Load Assist
                                  •  Cat Grade Control with Load Assist
                                  •  Advanced Tire Spin Reduction
                                • Sequence Assist Arrangement with Payload Estimator
                                  • Load Assist
                                    • Cat Grade Control with Load Assist
                                      • Advanced Tire Spin Reduction
                                        • OTHER ATTACHMENTS
                                          •  Camera arrangement – Work Area Vision System (WAVS)
                                          •  Cab beacon
                                          •  Air horn
                                          •  Air horn and beacon
                                          •  Wiring group
                                          •  Push Pull
                                        • Camera arrangement – Work Area Vision System (WAVS)
                                          • Cab beacon
                                            • Air horn
                                              • Air horn and beacon
                                                • Wiring group
                                                  • Push Pull
                                                    • SERVICE INSTRUCTIONS
                                                      •  Film arrangement – U.S. (ANSI)
                                                      •  Film arrangement – International (ISO)

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