Caterpillar 621G Scraper Specs

Category: Scrapers ➔
Manufacturer: Caterpillar ➔
Model: 621G ➔

The Caterpillar 621G is a wheel tractor-scraper in Caterpillar's 621 series, used for earthmoving, site preparation, road construction, and large-scale material hauling. It is a self-loading scraper designed to cut, load, haul, and spread material efficiently across medium to long distances. The 621G typically features a single-engine design, articulated steering, and a high-capacity bowl for moving soil, gravel, and other loose materials. Common applications include grading, mass excavation, and highway projects. As a scraper, the Caterpillar 621G is valued for productivity in bulk earthmoving operations and compatibility with support equipment such as push tractors and dozers.

Bowl

Caterpillar 621G Scraper Bowl specifications
Heaped Capacity	22 cu yd
Max Depth Of Cut	13.10 in (33.27 cm)
Rated Payload	52,800.00 lbs (23,949.71 kg)
Struck Capacity	15.7 cu yd
Width Of Cut	9.20 ft (2.80 m)

Dimensions

Caterpillar 621G Scraper Dimensions specifications
Axle To Vertical Hitch Pin	17.00 in (43.18 cm)
Front Of Tractor To Front Axle	120.40 in (305.82 cm)
Ground Clearance - Tractor	21.80 in (55.37 cm)
Height	12.17 ft (3.71 m)
Height - Overall Shipping	145.90 in (370.59 cm)
Height - Scraper Blade Maximum	20.60 in (52.32 cm)
Height - Top Of Cab	11.24 ft (3.43 m)
Height To Top Of Cab	11.25 ft (3.43 m)
Length	42.42 ft (12.93 m)
Length - Overall Machine	508.50 in (1,291.59 cm)
Overall Height	12.17 ft (3.71 m)
Overall Length	42.42 ft (12.93 m)
Overall Width	11.42 ft (3.48 m)
Rear Axle - Rear Of Machine	84.30 in (214.12 cm)
Rim Radius	17.00 in (43.18 cm)
Tractor Ground Clearance	1.83 ft (0.56 m)
Weight	71,090.00 lbs (32,245.92 kg)
Wheel Base	25.34 ft (7.72 m)
Wheelbase	25.42 ft (7.75 m)
Width	11.42 ft (3.48 m)
Width - Inside Of Bowl	116.00 in (294.64 cm)
Width - Outside Rear Tires	120.00 in (304.80 cm)
Width - Overall Machine	136.50 in (346.71 cm)
Width - Rear Tire Center Lines	86.60 in (219.96 cm)
Width - Tractor	123.20 in (312.93 cm)

Engine

Caterpillar 621G Scraper Engine specifications
Tractor Engine	Cat C15 ACERT

Hydraulics

Caterpillar 621G Scraper Hydraulics specifications
Apron Cylinder Bore	7.30 in (18.54 cm)
Apron Cylinder Stroke	23.50 in (59.69 cm)
Bowl Cylinder Bore	6.00 in (15.24 cm)
Bowl Cylinder Stroke	32.00 in (81.28 cm)
Compensator Settings - Cushion Hitch Circuit	2175 psi
Cushion Hitch Circuit	9.80 gpm (37.09 lpm)
Ejector Cylinder Bore	6.50 in (16.51 cm)
Ejector Cylinder Stroke	61.00 in (154.94 cm)
Relief Valve - Implement Circuit	2175 psi
Relief Valve - Steering Circuit	2250 psi
Scraper Circuit	72.10 gpm (272.90 lpm)
Secondary Steering Circuit	52.00 gpm (196.82 lpm)
Steering Circuit	55.00 gpm (208.18 lpm)

Operational

Caterpillar 621G Scraper Operational specifications
Alternator Supplied Amperage	75 amps
Cooling System Fluid Capacity	28.00 gal (105.98 l)
Differential Fluid Capacity	38.00 gal (143.83 l)
Engine Oil Fluid Capacity	9.50 gal (35.96 l)
Fuel Capacity	160.00 gal (605.60 l)
Hydraulic System Fluid Capacity	37.00 gal (140.05 l)
Operating Voltage	24 V
Tire Size	33.25-R29
Transmission Fluid Capacity	19.00 gal (71.92 l)
Wheel Coolant Fluid Capacity - Each	12.00 gal (45.42 l)

Scraper Bowl

Caterpillar 621G Scraper Scraper Bowl specifications
Apron Closure Force	24,075.00 lbs (10,920.25 kg)
Apron Opening	70.00 in (177.80 cm)
Capacity - Struck	15.7 cu yd
Capacity Heaped	22 cu yd
Cutting Edge Thickness	0.90 in (2.29 cm)
Depth Of Cut - Maximum	13.10 in (33.27 cm)
Depth Of Spread - Maximum	20.40 in (51.82 cm)
Ground Clearance - Maximum	20.60 in (52.32 cm)
Hyd. Penetration Force	119,600.00 lbs (54,249.71 kg)
Rated Load	52,800.00 lbs (23,949.71 kg)
Width - Cut - To Router Bits	119.00 in (302.26 cm)

Service Refill Capacities - Tractor

Caterpillar 621G Scraper Service Refill Capacities - Tractor specifications
Cooling System	14.00 gal (52.99 l)
Crankcase	10.00 gal (37.85 l)
Differential	32.00 gal (121.12 l)
Final Drive - Each	5.30 gal (20.06 l)
Hydraulic Reservoir	33.00 gal (124.91 l)
Transmission	18.00 gal (68.13 l)
Wheel Coolant - Each	12.00 gal (45.42 l)
Windshield Washer	1.50 gal (5.68 l)

Steering

Caterpillar 621G Scraper Steering specifications
Hydraulic Output	55.00 gpm (208.18 lpm)
Steering Angle - Left	85 degrees
Steering Angle - Right	90 degrees
Width - 180 Degrees Turn	35.90 ft (10.94 m)

Tractor Engine

Caterpillar 621G Scraper Tractor Engine specifications
Bore	5.70 in (14.48 cm)
Caterpillar Net Power	330.00 hp (246.09 kw)
Displacement	1,098.00 cu in (17,993.04 cu cm)
Eec 80/1269	330.00 hp (246.09 kw)
Gross Power	393.00 hp (293.06 kw)
Gross Power - Gears 1-2	359.00 hp (267.71 kw)
Gross Power - Gears 3-8	394.00 hp (293.81 kw)
Iso 9249	330.00 hp (246.09 kw)
Make	Caterpillar
Net Power	365.00 hp (272.18 kw)
Net Power - Gears 1-2	330.00 hp (246.09 kw)
Net Power - Gears 3-8	365.00 hp (272.18 kw)
Net Power - Tractor/Scraper	246 kW (330 hp)
Sae J1349	326.00 hp (243.10 kw)
Stroke	7.20 in (18.29 cm)

Transmission

Caterpillar 621G Scraper Transmission specifications
1 Forward	3.20 mph (5.15 kph)
2 Forward	5.80 mph (9.33 kph)
3 Forward	7.50 mph (12.07 kph)
4 Forward	10.10 mph (16.25 kph)
5 Forward	13.60 mph (21.89 kph)
6 Forward	18.20 mph (29.29 kph)
7 Forward	24.20 mph (38.95 kph)
8 Forward	32.00 mph (51.50 kph)
Max Speed Forward	32.00 mph (51.50 kph)
Max Speed Reverse	5.70 mph (9.17 kph)
Number Of Forward Gears	8
Number Of Reverse Gears	1
Reverse	5.7 mile/h
Transmission Type	8-speed automatic Powershift with Electronic Control
Travel Speed - Maximum	32.00 mph (51.50 kph)

Weights

Caterpillar 621G Scraper Weights specifications
Front Axel - Loaded	67,093.30 lbs (30,433.05 kg)
Front Axle - Empty	50177.3 %
Operating Weight	124,590.00 lbs (56,513.14 kg)
Rear Axle - Empty	23611.6 %
Rear Axle - Loaded	59496.2 %
Total Operating - Empty	73,788.80 lbs (33,470.08 kg)
Total Operating - Loaded	126,589.50 lbs (57,420.10 kg)

Weights - Standard, Tandem

Caterpillar 621G Scraper Weights - Standard, Tandem specifications
Front Axle	50,176.00 lbs (22,759.48 kg)
Front Axle Weight - Loaded	67,092.00 lbs (30,432.46 kg)
Rear Axle	23,612.00 lbs (10,710.24 kg)
Rear Axle - Weight - Loaded	59,497.00 lbs (26,987.42 kg)
Scraper Shipping	22,461.00 lbs (10,188.15 kg)
Total Operating - Empty	73,789.00 lbs (33,470.17 kg)
Total Operating - Loaded	126,589.00 lbs (57,419.88 kg)
Total Shipping	72,455.00 lbs (32,865.08 kg)
Tractor Shipping	49,994.00 lbs (22,676.93 kg)

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