637K (Tier 4 Final/Stage IV)


180° Curb-to-Curb Turning Width 40.12 ft (12.23 m)
Fuel Tank Refill Capacity - Scraper 370 gal (US) (1400 l)
Maximum Depth of Cut 17.7 in (450 mm)
Maximum Depth of Spread 21.1 in (535 mm)
637K Wheel Tractor-Scraper


180° Curb-to-Curb Turning Width 40.12 ft (12.23 m)
Fuel Tank Refill Capacity - Scraper 370 gal (US) (1400 l)
Maximum Depth of Cut 17.7 in (450 mm)
Maximum Depth of Spread 21.1 in (535 mm)
Overall Shipping Height 13.62 ft (4.15 m)
Overall Width 12.93 ft (3.94 m)
Rated Load 37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons)
Scraper Capacity - Heaped 34 yd³ (26 m³)
Scraper Capacity - Struck 24 yd³ (18.3 m³)
Tires - Scraper 37.25R35**E3
Tires - Tractor 37.25R35**E3
Top Speed - Loaded 34.7 mile/h (55.8 km/h)
Width - Cut 11.5 ft (3.51 m)
Emissions Cat C9.3 ACERT and C18 ACERT engines meet U.S. EPA Tier 4 Final/EU Stage IV emission standards.
Engine Model - Scraper Cat C9.3 ACERT
Engine Model - Tractor Cat C18 ACERT™
Flywheel Power - Scraper 290 HP (216 kW)
Flywheel Power - Tractor 570 HP (425 kW)
Rated Engine RPM - Scraper 2150 r/min (2150 r/min)
Rated Engine RPM - Tractor 1900 r/min (1900 r/min)
Flywheel Power - Tractor/Scraper 570 HP (425 kW)
Scraper Capacity - Heaped 34 yd³ (26 m³)
Top Speed - Loaded 34.7 mile/h (55.8 km/h)
Cooling System - Scraper 16.1 gal (US) (61 l)
Cooling System - Tractor 19.8 gal (US) (75 l)
Crankcase - Scraper 6.5 gal (US) (24.5 l)
Crankcase - Tractor 13.7 gal (US) (52 l)
Diesel Exhaust Fluid - Scraper 5.8 gal (US) (22 l)
Diesel Exhaust Fluid - Tractor 8 gal (US) (30.5 l)
Fuel Tank 370 gal (US) (1400 l)
Hydraulic System 37.5 gal (US) (142 l)
Transmission System - Scraper 12.9 gal (US) (49 l)
Transmission System - Tractor 29 gal (US) (110 l)
Front of Tractor to Front Axle 142.2 in (3612 mm)
Axle to Vertical Hitch Pin 20 in (509 mm)
Wheel Base 346.8 in (8808 mm)
Rear Axle - Rear of Machine 90.2 in (2292 mm)
Extended Push Block (Push-Pull) 108 in (2744 mm)
Ground Clearance - Tractor 26.1 in (664 mm)
Height - Overall Shipping 163.2 in (4145 mm)
Height - Scraper Blade Maximum 20 in (510 mm)
Height - Top of Cab 147 in (3733 mm)
Length - Maximum (Push-Pull) 655.1 in (16640 mm)
Length - Overall Machine - Standard 597 in (15164 mm)
Width - Inside of Bowl 134 in (3404 mm)
Width - Outside Rear Tires 143.2 in (3636 mm)
Width - Overall Machine 155 in (3937 mm)
Width - Rear Tire Centers 96.9 in (2462 mm)
Width - Tractor 137.8 in (3499 mm)
Operating Weight - Empty 114950 lb (52140 kg)
Overall Length 49.34 ft (15.04 m)
Operating Weight - Empty 119060 lb (54005 kg)
Overall Length - With Bail Down 54.59 ft (16.64 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.”
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
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 km/h)
Transmission Gear - Seventh 25.7 mile/h (41.95 km/h)
Transmission Gear - Sixth 19 mile/h (30.6 km/h)
Transmission Gear - Third 7.7 mile/h (12.4 km/h)
Apron Lower 3.8 s (3.8 s)
Apron Raise 4 s (4 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)

Benefits and Features

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.

This feature will allow the machine to control the slip of the tractor tires only.

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.

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.

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.

This standard feature allows the machine to prevent the operator from engaging the differential lock when damage could occur.

The K Series cab interior improves operator comfort and visibility. The overall interior is 21% larger than the G Series cab.

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 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.

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.

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.

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.

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.

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

  • Cat C18 ACERT engine with MEUI™
  • Cat C9.3 ACERT engine:
    • High pressure common rail fuel
    • Constant lift engine brake
  • Alternator, 150 Amp
  • HVAC system, heat, AC, defrost
  • Extended Life Coolant to –37° C (–34° F)
  • Bowl:
    • 18.3 m3 (24 yd3), struck
    • 26 m3 (34 yd3), heaped

Optional Equipment

  • Secondary Steering Arrangement
  • Sequence Assist Arrangement with Payload Estimator
  • Camera arrangement – Work Area Vision System (WAVS)
  • Film arrangement – U.S. (ANSI)