The Caterpillar 621 is a self-loading wheel tractor-scraper used in earthmoving, road construction, and large-scale site preparation. As part of Caterpillar's scraper lineup, the 621 is designed to cut, load, haul, and spread material efficiently over medium to long distances. It typically features a single-engine tractor-scraper configuration, high-capacity bowl, and rear ejector or push-loading capability depending on model variant. The Caterpillar 621 is used for moving soil, gravel, and other loose materials in grading and mass excavation applications. It is recognized for its production-oriented design, maneuverability, and suitability for high-volume earthmoving operations.
Cab
Caterpillar 621 Scraper Cab specifications
Exterior Sound Level
The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A). — Starting 2026 Model Year
ROPS/FOPS
Meets SAE and ISO standards — Starting 2026 Model Year
Dimensions
Caterpillar 621 Scraper Dimensions specifications
Axle to Vertical Hitch Pin
21.30 in (54.10 cm) — Starting 2026 Model Year
Front of Tractor to Front Axle
122.80 in (311.91 cm) — Starting 2026 Model Year
Ground Clearance - Tractor
21.90 in (55.63 cm) — Starting 2026 Model Year
Height - Overall Shipping
158.60 in (402.84 cm) — Starting 2026 Model Year
Height - Scraper Blade Maximum
20.50 in (52.07 cm) — Starting 2026 Model Year
Height - Top of Cab
142.20 in (361.19 cm) — Starting 2026 Model Year
Length - Maximum (Push-Pull)
613.20 in (1,557.53 cm) — Starting 2026 Model Year
Length - Overall Machine - Standard
551.80 in (1,401.57 cm) — Starting 2026 Model Year
Rear Axle - Rear of Machine
114.10 in (289.81 cm) — Starting 2026 Model Year
Wheel Base
314.90 in (799.85 cm) — Starting 2026 Model Year
Width - Inside of Bowl
120.00 in (304.80 cm) — Starting 2026 Model Year
Width - Outside Rear Tires
128.90 in (327.41 cm) — Starting 2026 Model Year
Width - Overall Machine
141.10 in (358.39 cm) — Starting 2026 Model Year
Width - Overall Machine - Ladder Down
149.20 in (378.97 cm) — Starting 2026 Model Year
Width - Rear Tire Centers
90.20 in (229.11 cm) — Starting 2026 Model Year
Width - Tractor
133.10 in (338.07 cm) — Starting 2026 Model Year
Engine
Caterpillar 621 Scraper Engine specifications
Engine Model - Tractor
Cat® C13 — Starting 2026 Model Year
Flywheel Power - Tractor
407.00 hp (303.50 kw) — Starting 2026 Model Year
Rated Engine RPM - Tractor
2000 r/min — Starting 2026 Model Year
General
Caterpillar 621 Scraper General specifications
180° Curb-to-Curb Turning Width
38.71 ft (11.80 m) — Starting 2026 Model Year
Fuel Tank Refill Capacity - Scraper
216.10 gal (817.94 l) — Starting 2026 Model Year
Maximum Depth of Cut
12.40 in (31.50 cm) — Starting 2026 Model Year
Maximum Depth of Spread
21.30 in (54.10 cm) — Starting 2026 Model Year
Overall Shipping Height
13.22 ft (4.03 m) — Starting 2026 Model Year
Overall Width
11.75 ft (3.58 m) — Starting 2026 Model Year
Rated Load
26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) — Starting 2026 Model Year
Scraper Capacity - Heaped
24 cu yd — Starting 2026 Model Year
Scraper Capacity - Struck
17.1 cu yd — Starting 2026 Model Year
Tires - Scraper
33.25R29**E3 — Starting 2026 Model Year
Tires - Tractor Drive
33.25R29**E3 — Starting 2026 Model Year
Top Speed - Loaded
33.50 mph (53.91 kph) — Starting 2026 Model Year
Width - Cut
10.30 ft (3.14 m) — Starting 2026 Model Year
Implement Cycle Times
Caterpillar 621 Scraper Implement Cycle Times specifications
Apron Lower
3.8 s — Starting 2026 Model Year
Apron Raise
2.95 s — Starting 2026 Model Year
Bail Lower
3.2 s — Starting 2026 Model Year
Bail Raise
1.8 s — Starting 2026 Model Year
Bowl Lower
3.5 s — Starting 2026 Model Year
Bowl Raise
3 s — Starting 2026 Model Year
Ejector Extend
5.2 s — Starting 2026 Model Year
Ejector Retract
6.7 s — Starting 2026 Model Year
Non Push-Pull
Caterpillar 621 Scraper Non Push-Pull specifications
Operating Weight - Empty
79,787.00 lbs (36,190.82 kg) — Starting 2026 Model Year
Overall Length
45.90 ft (13.99 m) — Starting 2026 Model Year
Push-Pull
Caterpillar 621 Scraper Push-Pull specifications
Operating Weight - Empty
80,630.00 lbs (36,573.20 kg) — Starting 2026 Model Year
