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Coal 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 – Coal Bowl Scraper

  • Specification Summary

  • Flywheel Power - Tractor/Scraper 425 kW (570 hp)/216 kW (290 hp)
  • Scraper Capacity - Heaped 38 m³
  • Top Speed - Loaded 55.8 km/h
  • Brakes ISO 3450:2011
  • Product Brochure


Product Details


Flywheel Power - Tractor/Scraper 425 kW (570 hp)/216 kW (290 hp)

Operating Specifications

Scraper Capacity - Heaped 38 m³
Top Speed - Loaded 55.8 km/h

Safety Criteria Compliance Standards

Brakes ISO 3450:2011
Steering System ISO 5010:2007
Seat Belt SAE J386:FEB2006
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)


180° Curb-to-Curb Turning Width 12.98 m
Flywheel Power - Tractor 425 kW
Tires - Tractor 37.25R35**E3
Overall Width 3.94 m
Rated Engine RPM - Scraper 2150 r/min
Rated Engine RPM - Tractor 1900 r/min
Operating Weight - Empty 52425 kg
Scraper Capacity - Heaped 38 m³
Width - Cut 3.51 m
Top Speed - Loaded 55.8 km/h
Overall Length 15480 mm
Fuel Tank Refill Capacity - Scraper 1400 l
Scraper Capacity - Struck 31 m³
Overall Shipping Height 4.15 m
Maximum Depth of Cut 450 mm
Emissions Cat C9.3 and Cat C18 engines meet U.S. EPA Tier 4 Final/EU Stage IV engine emission standards.
Maximum Depth of Spread 535 mm
Flywheel Power - Scraper 216 kW
Rated Load 34 472 kg (76,000 lb)/34.20 tonnes (38 tons)
Engine Model - Scraper Cat C9.3
Engine Model - Tractor Cat C18
Tires - Scraper 37.25R35**E3

Service Refill Capacities

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

Travel Speeds - Runout

Transmission Gear - Eighth 55.8 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 - Third 12.4 km/h
Transmission Gear - Seventh 41.95 km/h
Transmission Gear - Fifth 22.7 km/h
Transmission Gear - Sixth 30.6 km/h
Transmission Gear - Second 10 km/h

Implement Cycle Times

Bail Raise 1.5 s
Bowl Lower 3.5 s
Apron Lower 3.8 s
Ejector Retract 8.5 s
Bail Lower 2.1 s
Apron Raise 4 s
Ejector Extend 8.5 s
Bowl Raise 3.5 s


Width - Overall Machine 3937 mm
Width - Tractor 3499 mm
Ground Clearance - Tractor 664 mm
Axle to Vertical Hitch Pin 509 mm
Height - Top of Cab 3733 mm
Width - Outside Rear Tires 3636 mm
Height - Scraper Blade Maximum 538 mm
Rear Axle - Rear of Machine 2424 mm
Width - Rear Tire Centers 2462 mm
Front of Tractor to Front Axle 3612 mm
Width - Inside of Bowl 3404 mm
Length - Overall Machine - Standard 15480 mm
Height - Overall Shipping 4140 mm
Wheel Base 9576 mm


ROPS/FOPS Meet ISO standards
Exterior Sound Power Level The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).

Main Features and Benefits

Large Capacity Coal Scraper Bowl

Coal Bowls are longer and higher than standard scraper bowls, which allows Wheel Tractor-Scrapers to haul 38 m (50 yd) of low density loose coal. The bowls are designed and built to specifically deliver in coming loose coal to the stock pile and reserve stock piled coal to the feeder system.


Coal bowl scrapers are effective in compacting coal, which reduces the risk of spontaneous combustion of coal in the stockpile by eliminating the air spaces.

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. When Tire Spin Reduction is selected the machine will control wheel spin on the tractor by keeping the slip in the optimal range for loading by adjusting engine rpms with no additional operator input.

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.

Auto Stall

In cold weather conditions the machine will use the Auto Stall feature to help warm up the transmission oil faster resulting in the machine shifting out of torque converter drive (2nd gear) faster than on previous models.

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. In most cases, allowing the engine and transmission to select the correct gear to pull the load will result in a lower engine load factor and lower fuel burn verses top gear selection.

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, allowing the machine to utilize the more efficient tractor power train vs. the full time torque convertor drive scraper power train.

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.
    •  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 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 actuated
                      • Parking, hydraulic-released, spring-applied
                      • Throttle lock
                        • Transmission:
                          • 8-speed planetary power shift
                          • ECPC control
                          • APECS software
                          • Programmable top gear selection
                          • Transmission hold
                          • Differential lo
                            • POWER TRAIN – SCRAPER
                              •  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>
                            • 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
                            • ELECTRICAL – SCRAPER
                              •  Alarm, backup
                              •  Batteries (4) 12V, 1,000 CAA, 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>
                            • Alarm, backup
                              • Batteries (4) 12V, 1,000 CAA, maintenance free, high output
                                • Alternator, 65 Amp
                                  • Electrical system, 24V
                                    • Lighting system:
                                      • Brake lights, LED
                                      • Turn signals with hazard function, LED
                                      • 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>Fuel level</li><li>Park brake</li><li>Implement lockout<
                                      • 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 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:
                                                                                          • Coolant temperature
                                                                                          • Engine oil temperature
                                                                                          • Hydraulic oil temperature
                                                                                          • Fuel level
                                                                                          • Park brake
                                                                                          • Implement lockoutt
                                                                                            • FLUIDS
                                                                                              •  Extended Life Coolant to –37° C (–34° F)
                                                                                            • 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
                                                                                                •  Coal Bowl<ul><li>31 m3 (41 yd3), struck</li><li>38 m3 (50 yd3), heaped</li></ul>
                                                                                                •  Vandalism locks
                                                                                                •  Scraper fenders
                                                                                                •  Fast oil change
                                                                                                •  Rims (2)
                                                                                                •  Hydraulic position sensing cylinders (bowl lift and apron)
                                                                                              • Coal Bowl
                                                                                                • 31 m3 (41 yd3), struck
                                                                                                • 38 m3 (50 yd3), heaped
                                                                                                • Vandalism locks
                                                                                                  • Scraper fenders
                                                                                                    • 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
                                                                                                        •  Advanced Tire Spin Reduction
                                                                                                      • Sequence Assist Arrangement
                                                                                                        • Advanced Tire Spin Reduction
                                                                                                          • OTHER ATTACHMENTS
                                                                                                            •  Camera arrangement – WAVS
                                                                                                            •  Cab beacon
                                                                                                            •  Air horn
                                                                                                            •  Air horn and beacon
                                                                                                            •  Wiring group
                                                                                                          • Camera arrangement – WAVS
                                                                                                            • Cab beacon
                                                                                                              • Air horn
                                                                                                                • Air horn and beacon
                                                                                                                  • Wiring group
                                                                                                                    • SERVICE INSTRUCTIONS
                                                                                                                      •  Film arrangement – U.S. (ANSI)
                                                                                                                      •  Film arrangement – International (ISO)
                                                                                                                    • Film arrangement – U.S. (ANSI)
                                                                                                                      • Film arrangement – International (ISO)

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