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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.
| Overall Shipping Height | 13.22 ft |
| Overall Width | 11.75 ft |
| Scraper Capacity - Heaped | 24 yd³ |
| Fuel Tank Refill Capacity - Scraper | 216.1 gal (US) |
| Tires - Scraper | 33.25R29**E3 |
| Width - Cut | 10.3 ft |
| Maximum Depth of Spread | 21.3 in |
| Top Speed - Loaded | 33.5 mile/h |
| Rated Load | 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) |
| 180° Curb-to-Curb Turning Width | 38.71 ft |
| Scraper Capacity - Struck | 17.1 yd³ |
| Maximum Depth of Cut | 12.4 in |
| Tires - Tractor Drive | 33.25R29**E3 |
| Engine Model - Tractor | Cat C13 |
| Flywheel Power - Tractor | 407 HP |
| 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 |
| Flywheel Power - Tractor/Scraper | 304 kW (407 hp) |
| Scraper Capacity - Heaped | 24 yd³ |
| Top Speed - Loaded | 33.5 mile/h |
| Hydraulic System | 21.926 gal (US) |
| Crankcase | 8.08 gal (US) |
| Transmission System | 24.76 gal (US) |
| Cooling System | 11.89 gal (US) |
| Fuel Tank | 216.09 gal (US) |
| Diesel Exhaust Fluid | 8.057 gal (US) |
| Width - Overall Machine | 141.1 in |
| Width - Tractor | 133.1 in |
| Width - Inside of Bowl | 120 in |
| Width - Outside Rear Tires | 128.9 in |
| Height - Overall Shipping | 158.6 in |
| Height - Top of Cab | 142.2 in |
| Ground Clearance - Tractor | 21.9 in |
| Front of Tractor to Front Axle | 122.8 in |
| Axle to Vertical Hitch Pin | 21.3 in |
| Height - Scraper Blade Maximum | 20.5 in |
| Wheel Base | 314.9 in |
| Rear Axle - Rear of Machine | 114.1 in |
| Length - Overall Machine - Standard | 551.8 in |
| Length - Maximum (Push-Pull) | 613.2 in |
| Width - Overall Machine - Ladder Down | 149.2 in |
| Width - Rear Tire Centers | 90.2 in |
| Operating Weight - Empty | 79787 lb |
| Overall Length | 45.9 ft |
| Overall Length - With Bail Down | 51.1 ft |
| Operating Weight - Empty | 80630 lb |
| Exterior Sound Level | The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). |
| ROPS/FOPS | Meets SAE and ISO standards |
| Rollover Protection Structure (ROPS) | ISO 3471:2008 for up to 17 084 kg (37,664 lb) |
| Brakes | ISO 3450:1996 |
| Reverse Alarm | ISO 9533:2010 |
| Falling Object Protective Structure (FOPS) | ISO 3449:2005 Level II |
| Seat Belt | SAE J386:JUN1985 |
| Steering System | ISO 5010:2007 |
| Transmission Gear - Seventh | 24.8 mile/h |
| Transmission Gear - Fifth | 13.6 mile/h |
| Transmission Gear - First | 3.1 mile/h |
| Transmission Gear - Sixth | 18.4 mile/h |
| Transmission Gear - Second | 5.5 mile/h |
| Transmission Gear - Third | 7.5 mile/h |
| Transmission Gear - Fourth | 10.1 mile/h |
| Transmission Gear - Eighth | 33.5 mile/h |
| Transmission Gear - Reverse | 5.7 mile/h |
| Apron Raise | 2.95 s |
| Bowl Raise | 3 s |
| Ejector Retract | 6.7 s |
| Bowl Lower | 3.5 s |
| Apron Lower | 3.8 s |
| Ejector Extend | 5.2 s |
| Bail Lower | 3.2 s |
| Bail Raise | 1.8 s |
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