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621K Wheel Tractor-Scraper
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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.

Standard Equipment

Service Refill Capacities

Cooling System
11.89 gal
8.08 gal
Diesel Exhaust Fluid
8.0572 gal
Fuel Tank
216.09 gal
Hydraulic System
21.926 gal
Transmission System
24.76 gal

Safety Criteria Compliance Standards

ISO 3450:1996
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

Scraper Bowl

Scraper Capacity: Heaped
24.0 yd3

Implement Cycle Times

Apron Lower
3.8 Seconds
Apron Raise
2.95 Seconds
Bail Lower
3.2 Seconds
Bail Raise
1.8 Seconds
Bowl Lower
3.5 Seconds
Bowl Raise
3.0 Seconds
Ejector Extend
5.2 Seconds
Ejector Retract
6.7 Seconds

Non Push-Pull

Operating Weight (Empty)
79787.0 lb
Overall Length
45.9 ft


Width – Overall Machine
141.1 in
Width – Tractor
133.1 in
Width – Inside of Bowl
120.0 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
314.9 in
Rear Axle to Rear of Machine
114.1 in
Length – Maximum (Push-Pull)
613.2 in
Length – Overall Machine (Standard)
551.8 in
Width – Overall Machine – Ladder Down
149.2 in
Width – Rear Tire Centers
90.2 in

Travel Speeds (Runout)

Transmission Gear: Eighth
33.5 mph
Transmission Gear: Fifth
13.6 mph
Transmission Gear: First
3.1 mph
Transmission Gear: Fourth
10.1 mph
Transmission Gear: Reverse
5.7 mph
Transmission Gear: Second
5.5 mph
Transmission Gear: Seventh
24.8 mph
Transmission Gear: Sixth
18.4 mph
Transmission Gear: Third
7.5 mph


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


Top Speed (Loaded)
33.5 mph

General Data

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

Tractor Engine

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


Operating Weight (Empty)
80630.0 lb
Overall Length (With Bail Down)
51.1 ft


Engine Model: Tractor
Cat C13 ACERT™
Flywheel Power: Tractor
407.0 hp
Cat C13 ACERT engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.
Rated Engine RPM: Tractor
2000.0 RPM
Main Features and Benefits

Main Features and Benefits

• Tractor Serviceability Improvement - 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.

• 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.

• Advanced Cushion Hitch - With similar technology as the Cat® Advanced Ride Management seat suspension, this software allows the cushion hitch to prevent 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.

• High Pressure Steering - 620K 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.

• Draft Arm Overflow Guards - 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.

• Auto Stall - 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.

• Differential Lock Engagement Protection (Standard) - This standard feature allows the machine to prevent the operator from engaging the differential lock when damage could occur.

• Cab Improved - The interior of the K Series cabs has improved the operator comfort and visibility by redesigning the dash area and key pad placement.

• Machine Speed Limit - This feature 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 - 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.