621 Partial Wheel Tractor-Scraper

621 Partial Wheel Tractor-Scraper

Caterpillar offers partial wheel tractor-scraper power units designed for specialty machines that complement the traditional Cat® product line. These tractor-only configurations are available for purchase directly from Caterpillar OEM Solutions. They can be leveraged for a variety of final machines, including water pulls, elevating scrapers, lowboy trailer power units, and more. With improvements in productivity combined with enhancements in operator comfort and new safety features – Powered Access System and effective wet disc brakes – this machine offers high returns on time and investment.

  • Tractor Engine Cat® C13

  • Flywheel Power - Tractor 407 HP

  • Top Speed - Loaded 33.5 mile/h

  • Brakes ISO 3450:2011

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Product Specifications



  • Flywheel Power - Tractor 407HP

  • Note Meets U.S. EPA Tier 4 Final or EU Stage V emission standards, or equivalent to U.S. EPA Tier 2, or equivalent to U.S. EPA Tier 3 and EU Stage IIIA.

  • Tractor Engine Cat® C13


  • 1 Forward 3.1mile/h

  • 2 Forward 5.5mile/h

  • 3 Forward 7.5mile/h

  • 4 Forward 10.1mile/h

  • 5 Forward 13.6mile/h

  • 6 Forward 18.4mile/h

  • 7 Forward 24.8mile/h

  • 8 Forward 33.5mile/h

  • Reverse 5.7mile/h

  • Top Speed - Loaded 33.5mile/h


  • Brakes ISO 3450:2011

  • Cab Seat Belt: SAE J386:JUN1985

  • ROPS/FOPS ROPS: ISO 3471:2008 for up to 17 084 kg (37,664 lb). FOPS: ISO 3449:2005 Level II.


  • Width - 180° Turn 38.6ft

Service Refill Capacities - Tractor

  • Cooling System 11gal (US)

  • Crankcase 9.7gal (US)

  • Differential 41.7gal (US)

  • Final Drive - Each 5gal (US)

  • Fuel Tank 216.1gal (US)

  • Hydraulic Reservoir 21.9gal (US)

  • Transmission 25.5gal (US)

  • Windshield Washer 1.3gal (US)



Standard Equipment

  • Standard and optional equipment may vary. Consult your Cat dealer for details.

  • Cat® C13 engine with Mechanically Actuated Electronic Unit Injection (MEUI)

  • Transmission: 8-speed planetary powershift, ECPC control, APECS software, programmable top gear selection, transmission hold, differential lock, guard - power train, ground speed control, machine speed limit

  • Cat engine brake

  • Electric start, 24V

  • Fan, hydraulic

  • Ground level engine shutdown

  • Guard, crankcase

  • Starting aid, ether

  • Braking system: primary and secondary, wet disc, hydraulic; parking, hydraulic-released, spring-applied

  • Alternator, 115 ampere

  • Batteries (4), 12V, 1,000 CCA, maintenance free, high output

  • Electrical system, 24V

  • Lighting system: LED

  • Starting/charging receptacle

  • 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

  • Dome courtesy light

  • Horn, electric

  • T-handle implement control

  • Radio ready

  • ROPS/FOPS cab, pressurized

  • Keypad switches: rear engine start; throttle lock; wipers/washers; hazard lights; worklights on, off; information mode; messenger display; safety tab rocker switches, parking brake

  • Seat belt, static two-piece

  • Windows, sliding

  • Windshield wipers, front and rear windows, includes washers

  • Windows, laminated, zipped in

  • Mirror, rearview

  • Door lock

  • Messenger display gauges, warnings include: coolant temp; engine oil temp; hydraulic oil temp; DPF temp; fuel level; park brake; implement lockout; brake system, regeneration required; throttle lock; system voltage; secondary steering; bail down; differential lock; apron float; transmission hold; high beam lights; action lamp; engine speed, rpm; gear selection; DPF fill levels

  • Safety tab rocker switches

  • Seat: Cat Advanced Ride Management (ARM), Cat Comfort Series III, rotates 30 degrees

  • Steering wheel, tilt, telescoping, padded

  • Windows, right side emergency egress

  • Messenger display

  • Extended life coolant to -37° C (-34° F)

  • Advanced cushion hitch

  • Accumulators (cushion hitch and brake) with Canadian registration number (CRN)

  • Tow pin, front

  • Fenders, non-metallic

  • Heater, engine coolant 120V

  • Fast-fill fuel tank

Optional Equipment

  • Camera arrangement: Work Area Vision System (WAVS)

  • Cab beacon

  • Air horn

  • Air horn and beacon

  • Kingbolt housing

  • Rear wheel arrangement (set of 2)

  • Scraper draft arm package

  • Steering cylinder group (set of 2)