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Wheel tractor scrapers 651
Request a QuoteKey Information
Tractor Engine
C18 CAT®
Steering power: tractor/scraper
469 kW
Scraper capacity - struck
33.6 m³
Overview
High Productivity / Low-Cost Solution
Caterpillar is excited to announce the return of the 651 to its range of wheeled motor scrapers in 2022. Offering high levels of productivity, the 651's single-engine earthmoving system is a smart choice for many large-scale projects with fast cycle times when working in low-slope and low rolling resistance applications. First introduced to the CAT® wheeled motor scraper range in 1962, the 651 remains true to its reputation as one of our flagship machines. Its unique engine power allows it to work with a Cat D10 or D11 Tractor-Dozer, delivering ultra-fast loading times and the ability to work in abrasive and rocky conditions. Productivity improvements combined with improved driver comfort and new safety features (motorized access system and efficient oil bath discs) make this machine a high-return investment in terms of profits and time.
AdvantagesImproved Driver Comfort
Ergonomic controls and a redesigned cabin interior provide a more comfortable and efficient working environment throughout the day.
Up to 6% Increased Productivity
Energy efficiency improvements, the use of a payload estimator, and new transmission controls ensure increased productivity.
Unmatched Safety
Safety features help improve driver confidence by providing a safer operating environment: efficient oil bath discs, Work Area Visibility System (WAVS), and motorized cabin entry.
Key Features
- Be More Productive
- Best Working Comfort
- Designed for Security
- Ease of use
- Integrated Cat Technologies
Be More Productive

Be More Productive Move more material with the Advanced Productivity Electronic Control System (APECS), which allows the machine to better utilize power and engine torque. Set the desired maximum speed with the ground speed control and the machine will determine the most appropriate gear ratio for the engine and transmission while ensuring lower fuel consumption in reduced speed areas. The machine's speed limit function replaces the selection of the maximum gear. Thanks to the Auto-Stall function, the transmission reaches operating temperature more quickly when working in cold climate regions. Cat Payload Estimator for scrapers performs on-the-fly weighing to provide optimal payload and maximum job efficiency.
Best Working Comfort

Better Working Comfort Steer more easily with the completely redesigned high-pressure steering circuit. Reduce up to 14 individual driver commands per cycle thanks to Sequence Assist (optional equipment). Enjoy interior improvements and a more ergonomic working environment. Ergonomic and intuitive controls with multifunction display help drivers stay focused on their work. Maintain the desired temperature inside the cabin with automatic temperature control.
Designed for Security
Designed for Safety Enter and exit the cabin more easily with the new motorized access ladder system. Allow the driver to better understand the areas around the construction site with the Work Area Visibility System (WAVS). Ground-level access to fuel filling and multiple maintenance points for easier and safer service. Seat belt indicator providing visual and audible alerts when the seat belt is not fastened. Wide brake jaws and brake drums increase braking performance and reduce brake and drum wear. Separate front and rear circuits. Secondary brakes engage automatically in case of a drop in service brake pressure. The parking brake has a spring clamping and hydraulic pressure release mechanism that activates the maneuvering brakes.
Ease of use

Ease of Use The Cat Advanced Ride Management (ARM) seat suspension reduces the movement of the end stroke of the load cylinder for a smoother ride. Engine overspeed protection engages automatically without driver input when the machine is in eighth gear. The machine provides assistance by reducing its speed through cancellation of the acceleration command and engagement of the engine compression brake.
Integrated Cat Technologies

Integrated Cat Technologies VisionLink® allows access to information anywhere and at any time in order to make informed decisions to increase productivity, reduce costs, simplify maintenance, and improve safety on the job site. Product Link™ collects machine data, which is then accessible online via web and mobile applications (optional equipment)
Product Specifications for 651
- TRACTOR ENGINE
- Tractor EngineC18 Cat
- TRACTOR ENGINE
- Flywheel Power: Tractor/Scraper469 kW (629 hp)
- Net Power469 kW (637 hp)
- Gross Power (SAE J1995)475 kW
- Net Power (ISO 14396)436 kW
- Net Power (SAE J1349/ISO 9249)436 kW
- Bore145 mm
- Stroke183 mm
- Displacement18.1 l
- SCRAPER BOWL
- Scraper Bowl Capacity - Heaped33.6 m³
- Rated Load47200 kg
- Capacity - Struck24.5 m³
- Cutting Depth - Maximum417 mm
- Cutting Width - Cutting Edge3.8 m
- Maximum Ground Clearance0.7 m
- Hyd. Penetration Force - 657G542 kN
- Spreading Depth - Maximum530 mm
- Apron Opening2337 mm
- Apron Closing Force176 kN
- TRANSMISSION
- Maximum Speed, Loaded56.1 km/h
- 1st Gear5.7 km/h
- 2nd Gear10.5 km/h
- 3rd Gear12.5 km/h
- 4th Gear17 km/h
- 5th Gear22.8 km/h
- 6th Gear30.9 km/h
- 7th Gear41.4 km/h
- 8th Gear56.1 km/h
- Reverse10.8 km/h
- HYDRAULIC SYSTEM
- Bowl Bore180 mm
- Bowl Stroke950 mm
- Apron Bore180 mm
- Apron Stroke759.5 mm
- Steering Circuit (at max idle)288 l/min
- Hitch Circuit74 l/min
- Secondary Steering Circuit55 l/h
- Steering Relief Valve - Steering Circuit13500 kPa
- Steering Relief Valve - Implement Circuit13780 kPa
- Hitch Compensator SettingsHitch Circuit 20700 kPa
- STEERING
- Width - 180° Steering - Right13.6 m
- Width - 180° Steering - Left14.5 m
- Steering Angle - Right90
- Steering Angle - Left85
- CAPACITIES - TRACTOR
- Crankcase38 l
- Transmission136 l
- Differential136 l
- Final Drives - Each29.5 l
- Cooling System88.6 l
- Hydraulic Tank150 l
- Windshield Washer5 l
- DIMENSIONS
- Width - Overall Machine4.36 m
- Tractor Width3.75 m
- Rear Tire Centerline Width2.81 m
- Bowl Inside Width3.68 m
- Bowl Outside Width - Shipping Width3.93 m
- Shipping Height - Overall4.66 m
- Cab Height3.92 m
- Tractor Ground Clearance0.7 m
- Front of Tractor to Front Axle4.55 m
- Front Axle to Vertical Hitch Pin0.55 m
- Maximum Scraper Blade Height0.66 m
- Wheelbase9.96 m
- Length - Overall Machine17.97 m
- Rear Axle: Rear of Machine2.46 m
- WEIGHT - SCRAPER ASSIST
- Shipping Total72804 kg
- Tractor Shipping42472 kg
- Scraper Shipping29061 kg
- Total Operating Weight - Empty74500 kg
- Front Axle42566 kg
- Rear Axle30238 kg
- Total Operating Weight - Loaded121700 kg
- Front Axle - Loaded60856 kg
- Rear Axle - Loaded59121 kg
- CAPACITIES - SCRAPER
- Fuel Tank1628 l
- Differential168 l
- Final Drives - Each30 l
- Transmission121 l
- Crankcase34 l
- Cooling System63.2 l
Standard Equipment for 651
-
NOTE
- Standard equipment and options may vary. For more information, please consult your Cat dealer.
-
ELECTRICAL EQUIPMENT
- Reverse Warning
- 115A Alternator - Tractor Engine
- 65A Alternator - Scraper Engine
- Tractor Batteries (4), 12V Maintenance-Free High Output
- Scraper Batteries (4), 12V Maintenance-Free High Output
- 24V Electrical Circuit
- Tractor Lighting
- Scraper Lighting
- Tractor and Scraper Engine Starting Receptacle
-
DRIVER'S COMPARTMENT
- Air Conditioner (with Heater and Defroster)
- Automotive Style Fuse Panel with Fuse Puller
- Lunch Basket Platform with Retaining Strap
- Clothes Hook
- Cup Holder
- Diagnostic Connection Port (12V)
- Interior Light
- Engine Speed Lock
- Fan Defroster
- Instrument Group
- Horn
- Equipment Control Manipulator
- Mirrors
- Ambient Radio Ready
- 2 Radio Openings, Speakers, 5A Converter
- ROPS Cab with Soundproofing and Pressurization
- Static 2-Part Seat Belt
- Scraper Engine Controls
- Seat, Air Suspension, Cat Advanced Ride Management
- Tilt and Telescopic Steering Wheel
- Storage Compartment
- Hold Ratio
- Sliding Side Windows
- Windshield - Laminated Glass
- Front and Rear Windshield Wiper/Washer
- Armrest/Handle
-
POWERTRAIN
- Tractor
- Scraper
-
OTHER STANDARD EQUIPMENT
- Tractor
- Scraper
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