621 Wheel Tractor-Scraper
Our wheel tractor-scrapers have long been considered the basic method of moving volumes of material, and the Cat® 621 Wheel Tractor-Scraper is no exception. Known for its ability to be push-loaded and high travel speeds, it’s always an earthmover’s first tool of choice when working in challenging load areas. With an open bowl and a single engine, this machine is designed to handle a wide range of material types ranging from sand to ripped rock 609.6 mm (24 ") or less in size.
| Flywheel Power - Tractor/Scraper | 304 kW (407 hp) |
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| Scraper Capacity - Heaped | 18.4 m³ |
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| Top Speed - Loaded | 53.9 km/h |
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| Width - Overall Machine | 3585 mm |
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| Width - Tractor | 3381 mm |
| Width - Inside of Bowl | 3048 mm |
| Height - Overall Shipping | 4029 mm |
| Height - Top of Cab | 3612 mm |
| Ground Clearance - Tractor | 557 mm |
| Front of Tractor to Front Axle | 3119 mm |
| Axle to Vertical Hitch Pin | 540 mm |
| Height - Scraper Blade Maximum | 520 mm |
| Wheel Base | 7998 mm |
| Rear Axle - Rear of Machine | 2898 mm |
| Length - Maximum (Push-Pull) | 15576 mm |
| Length - Overall Machine - Standard | 14015 mm |
| Width - Outside Rear Tires | 3275 mm |
| Width - Overall Machine - Ladder Down | 3790 mm |
| Width - Rear Tire Centers | 2290 mm |
| Fuel Tank | 818 l |
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| Cooling System | 45 l |
| Crankcase | 30.58 l |
| Diesel Exhaust Fluid | 30.5 l |
| Hydraulic System | 83 l |
| Transmission System | 93 l |
| Exterior Sound Level | The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). |
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| ROPS/FOPS | Meets SAE and ISO standards |
| Engine Model - Tractor | Cat® C13 |
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| Flywheel Power - Tractor | 304 kW |
| Note | Cat® C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards. |
| Rated Engine RPM - Tractor | 2000 r/min |
| 180° Curb-to-Curb Turning Width | 11.8 m |
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| Fuel Tank Refill Capacity - Scraper | 818 l |
| Maximum Depth of Cut | 315 mm |
| Maximum Depth of Spread | 540 mm |
| Overall Shipping Height | 4.03 m |
| Overall Width | 3.58 m |
| Rated Load | 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) |
| Scraper Capacity - Heaped | 18.4 m³ |
| Scraper Capacity - Struck | 13 m³ |
| Tires - Scraper | 33.25R29**E3 |
| Tires - Tractor Drive | 33.25R29**E3 |
| Top Speed - Loaded | 53.9 km/h |
| Width - Cut | 3.14 m |
| Apron Lower | 3.8 s |
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| Apron Raise | 2.95 s |
| Bail Lower | 3.2 s |
| Bail Raise | 1.8 s |
| Bowl Lower | 3.5 s |
| Bowl Raise | 3 s |
| Ejector Extend | 5.2 s |
| Ejector Retract | 6.7 s |
| Operating Weight - Empty | 36185 kg |
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| Overall Length | 14.02 m |
| Operating Weight - Empty | 36567 kg |
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| Overall Length - With Bail Down | 15.58 m |
| Brakes | ISO 3450:1996 |
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| Falling Object Protective Structure (FOPS) | ISO 3449:2005 Level II |
| Reverse Alarm | ISO 9533:2010 |
| Rollover Protection Structure (ROPS) | ISO 3471:2008 for up to 17 084 kg (37,664 lb) |
| Seat Belt | SAE J386:JUN1985 |
| Steering System | ISO 5010:2007 |
| Transmission Gear - Eighth | 53.9 km/h |
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| Transmission Gear - Fifth | 21.9 km/h |
| Transmission Gear - First | 5 km/h |
| Transmission Gear - Fourth | 16.3 km/h |
| Transmission Gear - Reverse | 9.2 km/h |
| Transmission Gear - Second | 8.9 km/h |
| Transmission Gear - Seventh | 39.9 km/h |
| Transmission Gear - Sixth | 29.6 km/h |
| Transmission Gear - Third | 12.1 km/h |
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