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Tractor EngineCat C18
Flywheel Power - Tractor/Scraper469kW (629 hp)
Scraper Capacity - Heaped44 yd³ (33.6 m³)
Top Speed - Loaded34.9 mile/h (56.1 km/h)
Caterpillar is excited to announce the 651 comeback into our Wheel Tractor-Scraper lineup in 2022. Delivering high levels of productivity, the 651 single engine earthmoving system is a wise choice on numerous large-scale projects by providing fast cycle times when working in lower grades and rolling resistance applications. First introduced into the Cat® Wheel Tractor-Scraper lineup in 1962, the 651 continues to uphold its legacy as one of our signaturemachines. Its single engine power gives the ability to work with a Cat D10 or D11 push dozer delivering ultra-fast load times and the ability to work in abrasive or rocky conditions. Improvements in productivity, combined with enhancements in operator comfort, and new safety features – Powered Access System and effective wet disc brakes – for a machine offering high returns on profit and time


Tractor EngineCat C18
Flywheel Power - Tractor/Scraper469kW (629 hp)
Scraper Capacity - Heaped44 yd³ (33.6 m³)
Top Speed - Loaded34.9 mile/h (56.1 km/h)
Net Power469 kW/637 hp
Rated Load104058 lb (47200 kg)
Gross Power (SAE J1995)637 HP (475 kW)
Net Power (ISO 14396)585 HP (436 kW)
Net Power (SAE J1349/ISO 9249)592 HP (436 kW)
Total Shipping160505 lb (72804 kg)
Tractor Shipping93635 lb (42472 kg)
Scraper Shipping64068 lb (29061 kg)
Total Operating - Empty164244 lb (74500 kg)
Front Axle93842 lb (42566 kg)
Rear Axle66663 lb (30238 kg)
Total Operating - Loaded268302 lb (121700 kg)
Front Axle - Loaded134165 lb (60856 kg)
Rear Axle - Loaded130340 lb (59121 kg)
Width - Overall Machine14.3 ft (4.36 m)
Width - Tractor12.3 ft (3.75 m)
Width - Rear Tire Center Lines9.21 ft (2.81 m)
Width - Inside of Bowl12.07 ft (3.68 m)
Width - Outside Bowl - Shipping Width12.98 ft (3.93 m)
Height - Overall Shipping15.29 ft (4.66 m)
Height - Top of Cab12.86 ft (3.92 m)
Ground Clearance - Tractor2.3 ft (0.7 m)
Front of Tractor to Front Axle14.93 ft (4.55 m)
Axle to Vertical Hitch Pin1.8 ft (0.55 m)
Height - Scraper Blade Maximum2.17 ft (0.66 m)
Wheel Base32.68 ft (9.96 m)
Length - Overall Machine58.96 ft (17.97 m)
Rear Axle - Rear of Machine8.07 ft (2.46 m)
Capacity - Struck32 yd³ (24.5 m³)
Depth of Cut - Maximum17.3 in (417 mm)
Width - Cut - To Router Bits12.5 ft (3.8 m)
Ground Clearance - Maximum2.3 ft (0.7 m)
Hyd. Penetration Force - 657G121000 lb (542 kN)
Depth of Spread - Maximum26 in (530 mm)
Apron Opening92 in (2337 mm)
Apron Closure Force39200 lb (176 kN)
Bore5.7 in (145 mm)
Stroke7.2 in (183 mm)
Displacement1105 in³ (18.1 l)
1 Forward3.5 mile/h (5.7 km/h)
2 Forward6.5 mile/h (10.5 km/h)
3 Forward7.8 mile/h (12.5 km/h)
4 Forward10.6 mile/h (17 km/h)
5 Forward14.2 mile/h (22.8 km/h)
6 Forward19.2 mile/h (30.9 km/h)
7 Forward25.7 mile/h (41.4 km/h)
8 Forward34.9 mile/h (56.1 km/h)
Reverse6.7 mile/h (10.8 km/h)
Width - 180° Turn - Right44.6 ft (13.6 m)
Width - 180° Turn - Left47.57 ft (14.5 m)
Steering Angle - Right90
Steering Angle - Left85
Crankcase13.7 gal (US) (38 l)
Transmission35.9 gal (US) (136 l)
Differential36 gal (US) (136 l)
Final Drive - Each6 gal (US) (29.5 l)
Cooling System23.4 gal (US) (88.6 l)
Hydraulic Reservoir39.6 gal (US) (150 l)
Windshield Washer0.5 gal (US) (5 l)
Bowl Cylinder Bore7.08 in (180 mm)
Bowl Cylinder Stroke37.4 in (950 mm)
Apron Cylinder Bore7.08 in (180 mm)
Apron Cylinder Stroke29.92 in (759.5 mm)
Steering Circuit (@ High Idle)76.08 gal/min (288 l/min)
Cushion Hitch Circuit19.54 gal/min (74 l/min)
Secondary Steering Circuit14.52 gal/hr (55 l/hr)
Relief Valve - Steering Circuit1959 psi (13500 kPa)
Relief Valve - Implement Circuit1999 psi (13780 kPa)
Compensator Settings - Cushion Hitch Circuit3002 psi (20700 kPa)
Fuel Tank430 gal (US) (1628 l)
Differential44 gal (US) (168 l)
Final Drive - Each7.8 gal (US) (30 l)
Transmission31.9 gal (US) (121 l)
Crankcase8.9 gal (US) (34 l)
Cooling System16.6 gal (US) (63.2 l)

Benefits and Features


  • Move more material with Advanced Productivity Electronic ControlSystem (APECS), which 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.
  • Cat Payload Estimator for scrapers achieves on-the-go weighing to deliver optimal payload and jobsite efficiency.


  • Steer with less effort with the newly designed high-pressure steering system.
  • Reduce up to 14 individual operator commands per cycle with
    Sequence Assist (optional attachment).
  • Enjoy interior improvements and a more ergonomic work
  • Intuitive, ergonomic controls with multifunction display keep
    operators focused on their work.
  • Maintain desired cab temperature with automatic temperature


  • 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
  • Separate front and rear circuits. Secondary brakes engage automatically if service pressure drops
  • Parking Brake features a spring-applied, hydraulic pressure released mechanism that operates the service brakes


  • 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.


  • Access information anytime, anywhere with Vision Link®– use it to make informed decisions that boost productivity, lower costs, simplify maintenance, and improve safety and security on your jobsite.
  • Product Link™
    collects machine data that can be viewed online
    through web and mobile applications (optional attachment).

Standard Equipment

  • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Alarm, backup
  • Alternator, 115 amp - tractor engine
  • Alternator, 65 amp - scraper engine
  • Batteries Tractor (4), 12V Maintenance Free, High Output
  • Batteries Scraper (4), 12V Maintenance Free, High Output
  • Electrical System, 24V
  • Lighting System - Tractor
  • Lighting System - Scraper
  • Starting Receptacle - tractor and scraper engines
  • Air Conditioner (includes heater and defroster)
  • Automotive style fuse panel with fuse puller
  • Lunch box platform with holding strap
  • Coat Hook
  • Cup holder
  • Diagnostic Connection Port (12V)
  • Dome Courtesy Light
  • Engine speed lock
  • Fan defroster
  • Gauge Group
  • Horn
  • Implement Control Joystick
  • Rearview Mirrors
  • Radio Ready
  • 2 radio openings, speakers, and 5-amp converter
  • ROPS Cab with Sound Suppression and Pressurization
  • Static Seatbelt, 2 piece
  • Scraper Engine Controls
  • Seat, Air Suspension, Cat Advanced Ride Management
  • Steering Wheel - tilt and telescoping
  • Storage Compartment
  • Transmission Hold
  • Windows - sliding side
  • Windshield - laminated glass
  • Windshield Wiper/Washer - front and rear
  • Wrist Rest/Grab Handle
  • Tractor
  • Scraper