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Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Cat Wheel Tractor-Scrapers to consistently deliver high productivity at the lowest cost per ton.


180° Curb-to-Curb Turning Width 38.71 ft 11.8 m Less
Overall Shipping Height 13.22 ft 4.03 m Less
Maximum Depth of Cut 12.4 in 315.0 mm Less
Fuel Tank Refill Capacity - Scraper 201.0 gal (US) 763.0 l Less
Scraper Capacity - Heaped 24.0 yd³ 18.4 m³ Less
Top Speed - Loaded 33.5 mile/h 53.9 km/h Less
Scraper Capacity - Struck 17.1 yd³ 13.0 m³ Less
Overall Width 11.71 ft 3.57 m Less
Maximum Depth of Spread 21.3 in 540.0 mm Less
Width - Cut 10.3 ft 3.14 m Less
Tires - Scraper 33.25R29**E3 33.25R29**E3 Less
Tires - Tractor Drive 33.25R29**E3 33.25R29**E3 Less
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) Less


Rated Engine RPM - Tractor 2000.0 r/min 2000.0 r/min Less
Flywheel Power - Tractor 407.0 HP 304.0 kW Less
Note C13 ACERT engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III. C13 ACERT engine emits equivalent to U.S. EPA Tier 2/EU Stage II or U.S. EPA Tier 3/EU Stage III. Less
Engine Model - Tractor Cat C13 ACERT™ Cat C13 ACERT™ Less

Tractor Engine

Flywheel Power - Tractor/Scraper 304 kW (407 hp) 304 kW (407 hp) Less

Scraper Bowl

Scraper Capacity - Heaped 24.0 yd³ 18.4 m³ Less


Top Speed - Loaded 33.5 mile/h 53.9 km/h Less

Service Refill Capacities

Cooling System 11.89 gal (US) 45.0 l Less
Hydraulic System 21.926 gal (US) 83.0 l Less
Crankcase 8.08 gal (US) 30.58 l Less
Transmission System 24.76 gal (US) 93.0 l Less
Fuel Tank 216.09 gal (US) 818.0 l Less


Width - Overall Machine 141.1 in 3585.0 mm Less
Width - Tractor 133.1 in 3381.0 mm Less
Width - Inside of Bowl 120.0 in 3048.0 mm Less
Width - Outside Rear Tires 128.9 in 3275.0 mm Less
Height - Overall Shipping 158.6 in 4029.0 mm Less
Height - Top of Cab 142.2 in 3612.0 mm Less
Ground Clearance - Tractor 21.9 in 557.0 mm Less
Front of Tractor to Front Axle 122.8 in 3119.0 mm Less
Axle to Vertical Hitch Pin 21.3 in 540.0 mm Less
Height - Scraper Blade Maximum 20.5 in 520.0 mm Less
Wheel Base 314.9 in 7998.0 mm Less
Rear Axle - Rear of Machine 114.1 in 2898.0 mm Less
Width - Rear Tire Centers 90.2 in 2290.0 mm Less
Width - Overall Machine - Ladder Down 149.2 in 3790.0 mm Less
Length - Maximum (Push-Pull) 613.2 in 15576.0 mm Less
Length - Overall Machine - Standard 551.8 in 14015.0 mm Less

Non Push-Pull

Operating Weight - Empty 79787.0 lb 36185.0 kg Less
Overall Length 45.9 ft 14.02 m Less


Operating Weight - Empty 80630.0 lb 36567.0 kg Less
Overall Length - With Bail Down 51.1 ft 15.58 m Less


Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A). The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A). Less
ROPS/FOPS Meets ISO standards Meets ISO standards Less

Safety Criteria Compliance Standards

Rollover Protection Structure (ROPS) ISO 3471:2008 for up to 17 084 kg (37,664 lb) ISO 3471:2008 for up to 17 084 kg (37,664 lb) Less
Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II ISO 3449:2005 Level II Less
Seat Belt SAE J386:JUN1985 SAE J386:JUN1985 Less
Reverse Alarm ISO 9533:2010 ISO 9533:2010 Less
Steering System ISO 5010:2007 ISO 5010:2007 Less
Brakes ISO 3450:2011 ISO 3450:2011 Less

Travel Speeds - Runout

Transmission Gear - Fifth 13.6 mile/h 21.9 km/h Less
Transmission Gear - Fourth 10.1 mile/h 16.3 km/h Less
Transmission Gear - Eighth 33.5 mile/h 53.9 km/h Less
Transmission Gear - First 3.1 mile/h 5.0 km/h Less
Transmission Gear - Second 5.5 mile/h 8.9 km/h Less
Transmission Gear - Third 7.5 mile/h 12.1 km/h Less
Transmission Gear - Seventh 24.8 mile/h 39.9 km/h Less
Transmission Gear - Reverse 5.7 mile/h 9.2 km/h Less
Transmission Gear - Sixth 18.4 mile/h 29.6 km/h Less

Implement Cycle Times

Bowl Lower 3.5 s 3.5 s Less
Ejector Extend 5.2 s 5.2 s Less
Bowl Raise 3.0 s 3.0 s Less
Ejector Retract 6.7 s 6.7 s Less
Bail Lower 3.2 s 3.2 s Less
Apron Lower 3.8 s 3.8 s Less
Apron Raise 2.95 s 2.95 s Less
Bail Raise 1.8 s 1.8 s Less

Tractor Serviceability Improvement

The filter bank located at the rear of the engine compartment has undergone improvements for serviceability by raising the filter bank up for easier access.

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. The desired result is improved hitch repair, reduced maintenance and improved operator ride in rough conditions.

High Pressure Steering

620K 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.

Draft Arm Overflow Guards

The open bowls now come standard with bowl side overflow guards to help prevent material from flowing over the bowl sides and falling onto the draft arms where material becomes lodged between the bowl side and draft arm resulting in decreased work cycle times.

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 (Standard)

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

Cab Improved

The interior of the K Series cabs has improved the operator comfort and visibility by redesigning the dash area and key pad placement.

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

621K Standard Equipment

  • Cat C13 ACERT engine with MEUI™
  • Cat engine brake
  • Electric start, 24 Volt
  • Air cleaner, dry type with precleaner
  • Fan, hydraulic
  • Ground level engine shutdown
  • Radiator, aluminum unit core, 9 fins per inch
  • Guard, crankcase
  • Muffler (only for less or non-regulated regions engine arrangement only)
  • Starting aid, ether
  • Braking system:
    – Primary and secondary, wet disc, hydraulic
    – 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

  • Braking system:
    – Primary and secondary, wet disc, hydraulic

  • Alternator, 150 Amp
  • Batteries (4), 12V, 1,000 CCA, maintenance free, high output
  • Electrical system, 24V
  • Lighting system:
    – Headlights, halogen
    – Turn signals with hazard function, LED floodlights, (2) cutting edge (1) bowl, halogen side vision (2)
  • Starting/charging receptacle

  • Alarm, backup
  • 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
    – Regeneration required
    – 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 pin, front
  • Vandalism locks
  • Heater, engine coolant 120V

  • Bowl
    – 18.4 m³ (24 yd³), heaped
    – 14.1 m³ (18.4 yd³), struck
  • Vandalism locks
  • Hydraulic position sensing cylinders (bowl lift and apron)

621K Optional Equipment

  • Secondary Steering Arrangement

  • Sequence Assist Arrangement
  • Load Assist
  • Cat Grade Control with Load Assist

  • Camera arrangement – WAVS
  • Steering lock – external
  • Cab beacon
  • Air horn
  • Air horn and beacon
  • Fender, scraper
  • Guard, overflow
  • Wiring group
  • Year of manufacture plate

  • HID work lights

  • Cooling, high ambient HRC
  • Cooling, low ambient HRC
  • Cooling, high ambient LRC
  • Cooling, low ambient LRC

  • Film arrangement – U.S. (ANSI)
  • Film arrangement – International (ISO)