637K (TIER 2/STAGE II) 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 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 lock
    • Guard, power train
    • Standard tire spin reduction
    • Ground speed control
    • Machine speed limit
    • Differential lock protection


  • 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


  • 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
  • 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


  • 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
    • Fuel level
    • Park brake
    • Implement lockout
    • Brake system
    • 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


  • 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


  • 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)

637K (TIER 2/STAGE II) Optional Equipment


  • Secondary Steering Arrangement


  • Sequence Assist Arrangement
  • Advanced Tire Spin Reduction


  • Camera arrangement – WAVS
  • Cab beacon
  • Air horn
  • Air horn and beacon
  • Wiring group


  • Film arrangement – International (ISO)

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.

Select Units


637K Wheel Tractor – Coal Bowl Scraper


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

Operating Specifications

  • Scraper Capacity - Heaped 50.0 yd³ 38.0 m³
  • Top Speed - Loaded 34.7 mile/h 55.8 km/h


  • Fuel Tank Refill Capacity - Scraper 370.0 gal (US) 1400.0 l
  • Overall Shipping Height 13.62 ft 4.15 m
  • Overall Width 12.93 ft 3.94 m
  • Scraper Capacity - Heaped 50.0 yd³ 38.0 m³
  • Scraper Capacity - Struck 41.0 yd³ 31.0 m³
  • 180° Curb-to-Curb Turning Width 42.59 ft 12.98 m
  • Emissions Cat C9.3 ACERT and Cat C18 ACERT engines meet U.S. EPA Tier 2/EU Stage II equivalent emission standards. Cat C9.3 ACERT and Cat C18 ACERT engines meet U.S. EPA Tier 2/EU Stage II equivalent emission standards.
  • Engine Model - Scraper Cat C9.3 ACERT Cat C9.3 ACERT
  • Engine Model - Tractor Cat C18 ACERT™ Cat C18 ACERT™
  • Flywheel Power - Scraper 290.0 HP 216.0 kW
  • Flywheel Power - Tractor 570.0 HP 425.0 kW
  • Maximum Depth of Cut 17.7 in 450.0 mm
  • Maximum Depth of Spread 21.1 in 535.0 mm
  • Operating Weight - Empty 117782.0 lb 52425.0 kg
  • Overall Length 609.5 in 15480.0 mm
  • Rated Engine RPM - Scraper 2150.0 r/min 2150.0 r/min
  • Rated Engine RPM - Tractor 1900.0 r/min 1900.0 r/min
  • Rated Load 37 285 kg (82,200 lb)/37.285 tonnes (41.1 tons) 37 285 kg (82,200 lb)/37.285 tonnes (41.1 tons)
  • Tires - Scraper 37.25R35**E3 37.25R35**E3
  • Tires - Tractor 37.25R35**E3 37.25R35**E3
  • Top Speed - Loaded 34.7 mile/h 55.8 km/h
  • Width - Cut 11.5 ft 3.51 m


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


  • Axle to Vertical Hitch Pin 20.0 in 509.0 mm
  • Front of Tractor to Front Axle 142.2 in 3612.0 mm
  • Ground Clearance - Tractor 26.1 in 664.0 mm
  • Height - Overall Shipping 163.0 in 4140.0 mm
  • Height - Scraper Blade Maximum 21.2 in 538.0 mm
  • Height - Top of Cab 147.0 in 3733.0 mm
  • Length - Overall Machine - Standard 609.5 in 15480.0 mm
  • Rear Axle - Rear of Machine 95.4 in 2424.0 mm
  • Width - Inside of Bowl 134.0 in 3404.0 mm
  • Width - Outside Rear Tires 143.2 in 3636.0 mm
  • Width - Overall Machine 155.0 in 3937.0 mm
  • Width - Rear Tire Centers 96.9 in 2462.0 mm
  • Width - Tractor 137.8 in 3499.0 mm
  • Wheel Base 377.0 in 9576.0 mm

Implement Cycle Times

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

Safety Criteria Compliance Standards

  • Brakes ISO 3450:2011 ISO 3450:2011
  • Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II ISO 3449:2005 Level II
  • Reverse Alarm ISO 9533:2010 ISO 9533:2010
  • 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)
  • Seat Belt SAE J386:FEB2006 SAE J386:FEB2006
  • Steering System ISO 5010:2007 ISO 5010:2007

Service Refill Capacities

  • Cooling System - Scraper 16.1 gal (US) 61.0 l
  • Cooling System - Tractor 19.8 gal (US) 75.0 l
  • Crankcase - Scraper 6.5 gal (US) 24.5 l
  • Crankcase - Tractor 13.7 gal (US) 52.0 l
  • Fuel Tank 370.0 gal (US) 1400.0 l
  • Hydraulic System 37.5 gal (US) 142.0 l
  • Transmission System - Scraper 12.9 gal (US) 49.0 l
  • Transmission System - Tractor 29.0 gal (US) 110.0 l

Travel Speeds - Runout

  • Transmission Gear - Eighth 34.7 mile/h 55.8 km/h
  • Transmission Gear - Fifth 14.1 mile/h 22.7 km/h
  • Transmission Gear - First 3.4 mile/h 5.5 km/h
  • Transmission Gear - Fourth 10.5 mile/h 16.9 km/h
  • Transmission Gear - Reverse 6.2 mile/h 9.9 km/h
  • Transmission Gear - Second 6.2 mile/h 10.0 km/h
  • Transmission Gear - Seventh 25.7 mile/h 41.95 km/h
  • Transmission Gear - Sixth 19.0 mile/h 30.6 km/h
  • Transmission Gear - Third 7.7 mile/h 12.4 km/h
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