Open Bowl Scrapers Caterpillar 621K

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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  • 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.


  • 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.


  • 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.


  • 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.

Specificatii tehnice


Maximum Depth of Cut 315 mm
Maximum Depth of Spread 540 mm
180° Curb-to-Curb Turning Width 11.8 m
Scraper Capacity - Struck 13 m³
Tires - Scraper 33.25R29**E3
Overall Width 3.57 m
Overall Shipping Height 4.03 m
Width - Cut 3.14 m
Tires - Tractor Drive 33.25R29**E3
Top Speed - Loaded 53.9 km/h
Fuel Tank Refill Capacity - Scraper 763 l
Scraper Capacity - Heaped 18.4 m³
Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
Rated Engine RPM - Tractor 2000 r/min
Engine Model - Tractor Cat C13
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.
Tractor Engine
Flywheel Power - Tractor/Scraper 304 kW (407 hp)
Scraper Bowl
Scraper Capacity - Heaped 18.4 m³
Top Speed - Loaded 53.9 km/h
Service Refill Capacities
Hydraulic System 83 l
Cooling System 45 l
Fuel Tank 818 l
Crankcase 30.58 l
Diesel Exhaust Fluid 30.5 l
Transmission System 93 l
Width - Overall Machine 3585 mm
Width - Tractor 3381 mm
Width - Inside of Bowl 3048 mm
Width - Outside Rear Tires 3275 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 - Rear Tire Centers 2290 mm
Width - Overall Machine - Ladder Down 3790 mm
Non Push-Pull
Overall Length 14.02 m
Operating Weight - Empty 36185 kg
Operating Weight - Empty 36567 kg
Overall Length - With Bail Down 15.58 m
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 29.6 km/h
Transmission Gear - Fifth 21.9 km/h
Transmission Gear - Reverse 9.2 km/h
Transmission Gear - Second 8.9 km/h
Transmission Gear - Third 12.1 km/h
Transmission Gear - First 5 km/h
Transmission Gear - Eighth 53.9 km/h
Transmission Gear - Fourth 16.3 km/h
Transmission Gear - Seventh 39.9 km/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
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