651 Partial Scraper

651 Partial 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® C18 Cat® C18
Gross Power (SAE J1995) 637 HP 475 kW
Top Speed - Loaded 34.9 mile/h 56.1 km/h

Technicial Specifications

Tractor Engine Cat® C18 Cat® C18
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. 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
Gross Power (SAE J1995) 637 HP 475 kW
Net Power (SAE J1349/ISO 9249) 592 HP 436 kW
Bore 5.7 in 145 mm
Stroke 7.2 in 183 mm
Displacement 1105 in³ 18.1 l
Top Speed - Loaded 34.9 mile/h 56.1 km/h
1 Forward 3.5 mile/h 5.7 km/h
2 Forward 6.5 mile/h 10.5 km/h
3 Forward 7.8 mile/h 12.5 km/h
4 Forward 10.6 mile/h 17 km/h
5 Forward 14.2 mile/h 22.8 km/h
6 Forward 19.2 mile/h 30.9 km/h
7 Forward 25.7 mile/h 41.4 km/h
8 Forward 34.9 mile/h 56.1 km/h
Reverse 6.7 mile/h 10.8 km/h
Brakes ISO 3450:2011 ISO 3450:2011
ROPS/FOPS ROPS: ISO 3471:2008 for up to 26 600 kg (58,643 lb). FOPS: ISO 3449:2005 Level II ROPS: ISO 3471:2008 for up to 26 600 kg (58,643 lb). FOPS: ISO 3449:2005 Level II
Cab Seat Belt: SAE J386:AUG2012 Seat Belt: SAE J386:AUG2012
Width - 180° Turn - Right 44.6 ft 13.6 m
Width - 180° Turn - Left 47.57 ft 14.5 m
Steering Angle - Right 90 90
Steering Angle - Left 85 85
Service Refill Capacities - Tractor
Fuel Tank 430.1 gal (US) 1628 l
Crankcase 10 gal (US) 38 l
Transmission 35.9 gal (US) 136 l
Differential 36 gal (US) 136 l
Final Drive - Each 6 gal (US) 29.5 l
Cooling System 23.4 gal (US) 88.6 l
Hydraulic Reservoir 39.6 gal (US) 150 l
Windshield Washer 0.5 gal (US) 5 l

Advantages and Features


  • Steer with less effort with the newly designed high-pressure steering system.
  • Enjoy interior improvements and a more ergonomic work environment.
  • Intuitive, ergonomic controls with multifunction display keep operators focused on their work.
  • Maintain desired cab temperature with automatic temperature control.


  • Cat Advanced Ride Management (ARM) seat suspension reduces end stroke movement of the load cylinder for a smoother ride.
  • Engine overspeed protection will automatically engage with no operator input when the machine is in eighth gear. The machine will assist in slowing the machine speed by canceling the throttle command and engaging the engine compression brake.


  • The Advanced Productivity Electronic Control System (APECS) allows the machine to better utilize engine power and torque.
  • Set the desired top speed with Ground Speed Control, and the machine will find the gear that works best for the engine and the transmission, providing a lower fuel burn in speed reduced areas.
  • The Machine Speed Limit feature replaces Top Gear Selection.
  • Auto-Stall assists in quickly bringing the transmission to an operating temperature at start-up when working in colder climates.


  • Get in and out of the cab easier with the new powered access ladder system.
  • Enhance the operator’s awareness of site surroundings with the optional Work Area Vision System (WAVS).
  • Ground-level access to fuel fill and several maintenance points for easier and safer service.
  • Seat belt indicator provides visual and audible alerts when the seat belt is not in use.
  • Wide brake shoes and brake drums improve brake performance and reduce brake and drum wear.
  • Secondary brakes engage automatically if service pressure drops
  • Parking Brake features a spring-applied, hydraulic pressure released mechanism that operates the service brakes.



  • Full support of Cat dealer and parts network.
  • Eligible for Equipment Protection Plans (EPP) & Customer Value Agreements (CVAs).

Standard Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
    • 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 C18
    • Cat engine brake
    • Electric start, 24V
    • Fan, hydraulic
    • Ground level engine shutdown
    • Radiator
    • Guard, crankcase
    • Starting aid, ether
    • Braking system: primary and secondary, wet disc, hydraulic; parking, hydraulic-released, spring-applied
    • Throttle lock
    • Alarm, backup
    • Alternator, 115 ampere
    • Batteries (4), 12V, 1,000 CCA, maintenance free
    • Electrical system, 24V
    • Lighting system: headlights (halogen), turn signals with hazard functions (LED)
    • Turn signals with hazard function
    • 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 (1)
    • 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
    • Windows, laminated, zipped in
    • Wrist Rest/Grab Handle
    • Windshield wipers, front and rear windows, includes washers
    • 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)
    • Accumulators (brake and cushion hitch) with Canadian Registration Number (CRN)
    • Fast oil change
    • Vandalism locks
    • Steering locks
    • Heater, engine coolant 120V

Optional Equipment

    • Air cleaner, powered precleaner
    • Powered access ladder
    • 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)
    • Wiring group