Category : Scrapers ➔ Manufacturer : Caterpillar ➔ Model : 621K ➔
The Caterpillar 621K is a wheel tractor-scraper in Caterpillar's scraper lineup, designed for earthmoving, site preparation, and large-scale material transport. It uses a single-engine, open bowl scraper configuration with a rear push-pull arrangement for efficient loading and hauling in construction, mining, and roadbuilding applications. The 621K is part of Caterpillar's K Series and is known for integrated powertrain controls, operator visibility, and compatibility with high-production fleet operations. Typical uses include cut-and-fill work, mass excavation, and haul road development. The model is commonly referenced in heavy equipment inventories, rental fleets, and equipment specification databases.
Cab
Caterpillar 621K Scraper Cab specifications
Exterior Sound Level
The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
Rops/Fops
Meets SAE and ISO standards
Dimensions
Caterpillar 621K Scraper Dimensions specifications
Axle To Vertical Hitch Pin
21.30 in (54.10 cm)
Front Of Tractor To Front Axle
122.80 in (311.91 cm)
Ground Clearance - Tractor
21.90 in (55.63 cm)
Height
13.17 ft (4.01 m)
Height - Overall Shipping
158.60 in (402.84 cm)
Height - Scraper Blade Maximum
20.50 in (52.07 cm)
Height - Top Of Cab
11.85 ft (3.61 m)
Length
46.00 ft (14.02 m)
Length - Maximum (Push-Pull)
613.21 in (1,557.55 cm)
Length - Overall Machine - Standard
551.80 in (1,401.57 cm)
Rear Axle - Rear Of Machine
114.10 in (289.81 cm)
Weight
79,787.00 lbs (36,190.82 kg)
Wheel Base
26.25 ft (8.00 m)
Width
11.67 ft (3.56 m)
Width - Inside Of Bowl
120.00 in (304.80 cm)
Width - Outside Rear Tires
128.90 in (327.41 cm)
Width - Overall Machine
141.10 in (358.39 cm)
Width - Overall Machine - Ladder Down
149.20 in (378.97 cm)
Width - Rear Tire Centers
90.20 in (229.11 cm)
Width - Tractor
133.10 in (338.07 cm)
Engine
Caterpillar 621K Scraper Engine specifications
Engine Model - Tractor
Cat C13 ACERT
Flywheel Power - Tractor
407.00 hp (303.50 kw)
Note
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 rpm
General
Caterpillar 621K Scraper General specifications
180 Degrees Curb-To-Curb Turning Width
38.71 ft (11.80 m)
Fuel Tank Refill Capacity - Scraper
201.00 gal (760.79 l)
Maximum Depth Of Cut
12.40 in (31.50 cm)
Maximum Depth Of Spread
21.30 in (54.10 cm)
Overall Shipping Height
13.22 ft (4.03 m)
Overall Width
11.71 ft (3.57 m)
Rated Load
26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
Scraper Capacity - Heaped
24 cu yd
Scraper Capacity - Struck
17.11 cu yd
Tires - Scraper
33.25R29**E3
Tires - Tractor Drive
33.25R29**E3
Top Speed - Loaded
33.50 mph (53.91 kph)
Width - Cut
10.30 ft (3.14 m)
Implement Cycle Times
Caterpillar 621K Scraper Implement Cycle Times specifications
Apron Lower
3.8 s
Apron Raise
2.95 s
Bail Lower
3.2 s
Bail Raise
1.8 s
Bowl Lower
3.5 s
Bowl Raise
3 s
Ejector Extend
5.2 s
Ejector Retract
6.7 s
Non Push-Pull
Caterpillar 621K Scraper Non Push-Pull specifications
Operating Weight - Empty
79,787.00 lbs (36,190.82 kg)
Overall Length
45.90 ft (13.99 m)
Push-Pull
Caterpillar 621K Scraper Push-Pull specifications
Operating Weight - Empty
80,630.00 lbs (36,573.20 kg)
Overall Length - With Bail Down
51.10 ft (15.58 m)
Safety Criteria Compliance Standards
Caterpillar 621K Scraper Safety Criteria Compliance Standards specifications
Brakes
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
Caterpillar 621K Scraper Scraper Bowl specifications
Scraper Capacity - Heaped
24 cu yd
Service Refill Capacities
Caterpillar 621K Scraper Service Refill Capacities specifications
Cooling System
11.90 gal (45.04 l)
Crankcase
8.10 gal (30.66 l)
Diesel Exhaust Fluid
8.10 gal (30.66 l)
Fuel Tank
216.10 gal (817.94 l)
Hydraulic System
22.00 gal (83.27 l)
Transmission System
24.80 gal (93.87 l)
Tractor Engine
Caterpillar 621K Scraper Tractor Engine specifications
Flywheel Power - Tractor/Scraper
304 kW (407 hp)
Transmission
Caterpillar 621K Scraper Transmission specifications
Top Speed - Loaded
33.50 mph (53.91 kph)
Travel Speeds - Runout
Caterpillar 621K Scraper Travel Speeds - Runout specifications
Transmission Gear - Eighth
33.50 mph (53.91 kph)
Transmission Gear - Fifth
13.60 mph (21.89 kph)
Transmission Gear - First
3.10 mph (4.99 kph)
Transmission Gear - Fourth
10.10 mph (16.25 kph)
Transmission Gear - Reverse
5.70 mph (9.17 kph)
Transmission Gear - Second
5.50 mph (8.85 kph)
Transmission Gear - Seventh
24.80 mph (39.91 kph)
Transmission Gear - Sixth
18.40 mph (29.61 kph)
Transmission Gear - Third
7.50 mph (12.07 kph)
