651 Wheel Tractor-Scraper



Technical Specifications
Benefits and Features
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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 Engine Cat C18
Tractor Engine
Flywheel Power - Tractor/Scraper 469kW (629 hp)
Net Power 469 kW/637 hp
Gross Power (SAE J1995) 637 HP
Net Power (ISO 14396) 585 HP
Net Power (SAE J1349/ISO 9249) 592 HP
Bore 5.7 in
Stroke 7.2 in
Displacement 1105 in³
Scraper Bowl
Scraper Capacity - Heaped 44 yd³
Rated Load 104058 lb
Capacity - Struck 32 yd³
Depth of Cut - Maximum 17.3 in
Width - Cut - To Router Bits 12.5 ft
Ground Clearance - Maximum 2.3 ft
Hyd. Penetration Force - 657G 121000 lb
Depth of Spread - Maximum 26 in
Apron Opening 92 in
Apron Closure Force 39200 lb
Top Speed - Loaded 34.9 mile/h
1 Forward 3.5 mile/h
2 Forward 6.5 mile/h
3 Forward 7.8 mile/h
4 Forward 10.6 mile/h
5 Forward 14.2 mile/h
6 Forward 19.2 mile/h
7 Forward 25.7 mile/h
8 Forward 34.9 mile/h
Reverse 6.7 mile/h
Weights - Push-Pull
Total Shipping 160505 lb
Tractor Shipping 93635 lb
Scraper Shipping 64068 lb
Total Operating - Empty 164244 lb
Front Axle 93842 lb
Rear Axle 66663 lb
Total Operating - Loaded 268302 lb
Front Axle - Loaded 134165 lb
Rear Axle - Loaded 130340 lb
Width - Overall Machine 14.3 ft
Width - Tractor 12.3 ft
Width - Rear Tire Center Lines 9.21 ft
Width - Inside of Bowl 12.07 ft
Width - Outside Bowl - Shipping Width 12.98 ft
Height - Overall Shipping 15.29 ft
Height - Top of Cab 12.86 ft
Ground Clearance - Tractor 2.3 ft
Front of Tractor to Front Axle 14.93 ft
Axle to Vertical Hitch Pin 1.8 ft
Height - Scraper Blade Maximum 2.17 ft
Wheel Base 32.68 ft
Length - Overall Machine 58.96 ft
Rear Axle - Rear of Machine 8.07 ft
Width - 180° Turn - Right 44.6 ft
Width - 180° Turn - Left 47.57 ft
Steering Angle - Right 90
Steering Angle - Left 85
Service Refill Capacities - Tractor
Crankcase 13.7 gal (US)
Transmission 35.9 gal (US)
Differential 36 gal (US)
Final Drive - Each 6 gal (US)
Cooling System 23.4 gal (US)
Hydraulic Reservoir 39.6 gal (US)
Windshield Washer 0.5 gal (US)
Bowl Cylinder Bore 7.08 in
Bowl Cylinder Stroke 37.4 in
Apron Cylinder Bore 7.08 in
Apron Cylinder Stroke 29.92 in
Steering Circuit (@ High Idle) 76.08 gal/min
Cushion Hitch Circuit 19.54 gal/min
Secondary Steering Circuit 14.52 gal/hr
Relief Valve - Steering Circuit 1959 psi
Relief Valve - Implement Circuit 1999 psi
Compensator Settings - Cushion Hitch Circuit 3002 psi
Service Refill Capacities - Scraper
Fuel Tank 430 gal (US)
Differential 44 gal (US)
Final Drive - Each 7.8 gal (US)
Transmission 31.9 gal (US)
Crankcase 8.9 gal (US)
Cooling System 16.6 gal (US)


  • 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:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Electrical
    • 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
  • Operator Environment
    • 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
  • Power Train
    • Tractor
    • Scraper
  • Other Standard Equipment
    • Tractor
    • Scraper

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