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 621 Partial Wheel Tractor-Scraper |
 651 Partial Wheel Tractor-Scraper |
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Engine |
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| Tractor Engine | Cat® C13 | Cat® C18 | - |
| Flywheel Power - Tractor | 407 HP | - | - |
| 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. | - |
Transmission |
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| Top Speed - Loaded | 33.5 mile/h | 34.9 mile/h | - |
| 1 Forward | 3.1 mile/h | 3.5 mile/h | - |
| 2 Forward | 5.5 mile/h | 6.5 mile/h | - |
| 3 Forward | 7.5 mile/h | 7.8 mile/h | - |
| 4 Forward | 10.1 mile/h | 10.6 mile/h | - |
| 5 Forward | 13.6 mile/h | 14.2 mile/h | - |
| 6 Forward | 18.4 mile/h | 19.2 mile/h | - |
| 7 Forward | 24.8 mile/h | 25.7 mile/h | - |
| 8 Forward | 33.5 mile/h | 34.9 mile/h | - |
| Reverse | 5.7 mile/h | 6.7 mile/h | - |
Standards |
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| Brakes | ISO 3450:2011 | ISO 3450:2011 | - |
| ROPS/FOPS | ROPS: ISO 3471:2008 for up to 17 084 kg (37,664 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:JUN1985 | Seat Belt: SAE J386:AUG2012 | - |
Steering |
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| Width - 180° Turn | 38.6 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 |
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| Fuel Tank | 216.1 gal (US) | 430.1 gal (US) | - |
| Crankcase | 9.7 gal (US) | 10 gal (US) | - |
| Transmission | 25.5 gal (US) | 35.9 gal (US) | - |
| Differential | 41.7 gal (US) | 36 gal (US) | - |
| Final Drive - Each | 5 gal (US) | 6 gal (US) | - |
| Cooling System | 11 gal (US) | 23.4 gal (US) | - |
| Hydraulic Reservoir | 21.9 gal (US) | 39.6 gal (US) | - |
| Windshield Washer | 1.3 gal (US) | 0.5 gal (US) | - |
Tractor Engine |
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| Gross Power (SAE J1995) | - | 637 HP | - |
| Net Power (SAE J1349/ISO 9249) | - | 592 HP | - |
| Bore | - | 5.7 in | - |
| Stroke | - | 7.2 in | - |
| Displacement | - | 1105 in³ | - |
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