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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 |
| Scraper Engine | Cat C15 |
| Flywheel Power - Tractor/Scraper | 469kW (629 hp) / 353 kW (473 hp) |
| Net Power | 469 kW/637 hp |
| Gross Power (SAE J1995) | 637 HP |
| Net Power (ISO 14396) | 585 HP |
| Bore | 5.7 in |
| Stroke | 7.2 in |
| Displacement | 1105 in³ |
| Net Power (SAE J1349/ISO 9249) | 592 HP |
| 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 |
| 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 |
| Width - 180° Turn - Right | 44.6 ft |
| Width - 180° Turn - Left | 47.57 ft |
| Steering Angle - Right | 90 |
| Steering Angle - Left | 85 |
| 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) |
| 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 |
| 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 |
| 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) |
| Gross Power (SAE J1995) | 481 HP |
| Bore | 5.4 in |
| Displacement | 928 in³ |
| Net Power (ISO 14396) | 585 HP |
| Stroke | 6.75 in |
| Net Power | 353 kW/447 hp |
| Net Power (SAE J1349/ISO 9249) | 452 HP |
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