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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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General
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Maximum Depth of Cut 12.4 in 315.0 mm
Maximum Depth of Spread 21.3 in 540.0 mm
180° Curb-to-Curb Turning Width 38.71 ft 11.8 m
Scraper Capacity - Struck 17.1 yd³ 13.0 m³
Tires - Scraper 33.25R29**E3 33.25R29**E3
Overall Width 11.71 ft 3.57 m
Overall Shipping Height 13.22 ft 4.03 m
Width - Cut 10.3 ft 3.14 m
Tires - Tractor Drive 33.25R29**E3 33.25R29**E3
Top Speed - Loaded 33.5 mile/h 53.9 km/h
Fuel Tank Refill Capacity - Scraper 201.0 gal (US) 763.0 l
Scraper Capacity - Heaped 24.0 yd³ 18.4 m³
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)

EFFICIENCY THROUGH TECHNOLOGY

  • Machine Speed Limit is designed to take the place of top gear selection. If the machine top speed needs to be limited the operator can select the top speed through the display or the top speed can be set in ET. This will allow the machine to find the correct gear that works best for the engine and transmission. Allowing the engine and transmission to select the correct gear to pull the load in most cases resulting in a lower engine load factor and lower fuel burn verses using top gear selection that required the machine to run at engine speeds at or close high idle.
  • Ground Speed Control sets the desired top speed by the operator if job site conditions or segment speed limits require a speed less than full run out. Machine Speed Limit is intended for use when top speed needs to be limited for longer durations and Ground Speed Control is intended for use when the top speed needs to be reduced for shorter segments or intermediate periods of time. The operator can set the desired top speed and the machine will find the correct gear that works best for the engine and transmission. Allowing the engine and transmission to select the correct gear to pull the load in most cases will result in a lower engine load factor and lower fuel burn verses top gear selection.

OPERATOR COMFORT AND CONTROL

  • The interior of the K Series cabs has improved the operator comfort and visibility by redesigning the dash area and key pad placement.
  • Advanced Cushion Hitch prevents end stroke by having the ability to predict end stroke events and manage the rate of dampening. The desired result is improved hitch repair, reduced maintenance and improved operator ride in rough conditions.
  • 621K Series steering system design requires significantly less steering effort. The reduced steering effort will allow for decreased operator fatigue and a more efficient operator resulting in possible higher rates of production late in the work cycle.

BUILT-IN SAFETY FEATURES

  • Differential Lock Engagement Protection feature allows the machine to prevent the operator from engaging the differential lock when damage could occur.
  • The open bowls now come standard with bowl side overflow guards to help prevent material from flowing over the bowl sides and falling onto the draft arms where material becomes lodged between the bowl side and draft arm resulting in decreased work cycle times.
  • Engine Over Speed Protection - In the event of an engine over speed situation, the compression brake or brakes will automatically engage with no operator input. The machine determines the over speed condition based on rate of acceleration and applies compression brakes automatically.

SAVE ON MAINTENANCE TIME

  • In cold weather conditions the machine will use the Auto Stall feature to help warm up the transmission oil faster resulting in the machine shifting out of torque converter drive (2nd gear) faster than on previous models.
  • The filter bank located at the rear of the engine compartment has undergone improvements for serviceability by raising the filter bank up for easier access.

621K Standard Equipment

NOTE
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  • Standard and optional equipment may vary. Consult your Cat dealer for details.

621K Optional Equipment

NOTE
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  • Standard and optional equipment may vary. Consult your Cat dealer for details.
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