New CAT Equipment

621K Wheel Tractor-Scraper

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Cat Wheel Tractor-Scrapers to consistently deliver high productivity at the lowest cost per ton.

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Learn more about the 621K Wheel Tractor-Scraper

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Product Specs

General

Maximum Depth of Cut 12.4 in
Maximum Depth of Spread 21.3 in
180° Curb-to-Curb Turning Width 38.71 ft
Scraper Capacity - Struck 17.1 yd³
Tires - Scraper 33.25R29**E3
Overall Width 11.71 ft
Overall Shipping Height 13.22 ft
Width - Cut 10.3 ft
Tires - Tractor Drive 33.25R29**E3
Top Speed - Loaded 33.5 mile/h
Fuel Tank Refill Capacity - Scraper 201 gal (US)
Scraper Capacity - Heaped 24 yd³
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)

Engine

Rated Engine RPM - Tractor 2000 r/min
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.

Tractor Engine

Flywheel Power - Tractor/Scraper 304 kW (407 hp)

Scraper Bowl

Scraper Capacity - Heaped 24 yd³

Transmission

Top Speed - Loaded 33.5 mile/h

Service Refill Capacities

Hydraulic System 21.926 gal (US)
Cooling System 11.89 gal (US)
Fuel Tank 216.09 gal (US)
Crankcase 8.08 gal (US)
Diesel Exhaust Fluid 8.057 gal (US)
Transmission System 24.76 gal (US)

Dimensions

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 - Maximum (Push-Pull) 613.2 in
Length - Overall Machine - Standard 551.8 in
Width - Rear Tire Centers 90.2 in
Width - Overall Machine - Ladder Down 149.2 in

Non Push-Pull

Overall Length 45.9 ft
Operating Weight - Empty 79787 lb

Push-Pull

Operating Weight - Empty 80630 lb
Overall Length - With Bail Down 51.1 ft

Cab

ROPS/FOPS Meets SAE and ISO standards
Exterior Sound Level The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).

Safety Criteria Compliance Standards

Brakes ISO 3450:1996
Seat Belt SAE J386:JUN1985
Steering System ISO 5010:2007
Reverse Alarm ISO 9533:2010
Rollover Protection Structure (ROPS) ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Falling Object Protective Structure (FOPS) ISO 3449:2005 Level II

Travel Speeds - Runout

Transmission Gear - Sixth 18.4 mile/h
Transmission Gear - Fifth 13.6 mile/h
Transmission Gear - Reverse 5.7 mile/h
Transmission Gear - Second 5.5 mile/h
Transmission Gear - Third 7.5 mile/h
Transmission Gear - First 3.1 mile/h
Transmission Gear - Eighth 33.5 mile/h
Transmission Gear - Fourth 10.1 mile/h
Transmission Gear - Seventh 24.8 mile/h

Implement Cycle Times

Bail Lower 3.2 s
Bail Raise 1.8 s
Apron Lower 3.8 s
Apron Raise 2.95 s
Ejector Extend 5.2 s
Ejector Retract 6.7 s
Bowl Raise 3 s
Bowl Lower 3.5 s