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Open Bowl Scrapers(Non Current)

Cat Wheel Tractor-Scrapers have the power, traction, and speed for reliable output in a variety of applications. Scraper options include single- and tandem-engine open bowls, tandem engine push-pulls, elevators, and auger arrangements.

621G Scrapers

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Caterpillar Wheel Tractor-Scrapers to consistently deliver high productivity at the lowest cost per ton.

  • Specification Summary

  • Tractor Engine C15 ACERT
  • Net Power - Tractor/Scraper 246 kW (330 hp)
  • Gross Power - Gears 1-2 268 kW
  • Gross Power - Gears 3-8 294 kW

Product Details


Tractor Engine C15 ACERT

Tractor Engine

Net Power - Tractor/Scraper 246 kW (330 hp)
Gross Power - Gears 1-2 268 kW
Gross Power - Gears 3-8 294 kW
Net Power - Gears 1-2 246 kW
Net Power - Gears 3-8 272 kW
Caterpillar Net Power 246 kW
ISO 9249 246 kW
EEC 80/1269 246 kW
SAE J1349 243 kW
Bore 140 mm²
Stroke 165 mm²
Displacement 15.2 l

Scraper Bowl

Capacity Heaped 17 m³
Rated Load 23950 kg
Capacity - Struck 12 m³
Depth of Cut - Maximum 333 mm²
Width - Cut - To Router Bits 3023 mm²
Ground Clearance - Maximum 522 mm²
Cutting Edge Thickness 22 mm²
Hyd. Penetration Force - 621G 150.4 kN
Depth of Spread - Maximum 522 mm²
Apron Opening 1780 mm²
Apron Closure Force 107 kN


Travel Speed - Maximum 51.5 km/h
1 Forward 5 km/h
2 Forward 7.6 km/h
3 Forward 10.9 km/h
4 Forward 14.8 km/h
5 Forward 19.9 km/h
6 Forward 26.9 km/h
7 Forward 36.4 km/h
8 Forward 51.5 km/h
Reverse 9.2 km/h


Bowl Cylinder Bore 152 mm²
Bowl Cylinder Stroke 813 mm²
Apron Cylinder Bore 184 mm²
Apron Cylinder Stroke 597 mm²
Ejector Cylinder Bore 165 mm²
Ejector Cylinder Stroke 1549 mm²
Steering Circuit 209 l/min
Scraper Circuit 284 l/min
Cushion Hitch Circuit 37 l/min
Secondary Steering Circuit 150 l/min
Relief Valve - Steering Circuit 15500 kPa
Relief Valve - Implement Circuit 15000 kPa
Compensator Settings - Cushion Hitch Circuit 16000 kPa


Width - 180° Turn 10.9 m
Steering Angle - Right 90°
Steering Angle - Left 85°
Hydraulic Output 209 l/min

Service Refill Capacities - Tractor

Crankcase 36 l
Transmission 72 l
Differential 144 l
Final Drive - Each 19 l
Cooling System 107 l
Hydraulic Reservoir 140 l
Wheel Coolant - Each 45 l
Windshield Washer 6 l


Width - Overall Machine 3467 mm²
Width - Tractor 3130 mm²
Width - Rear Tire Center Lines 2180 mm²
Width - Inside of Bowl 2946 mm²
Width - Outside Rear Tires 3048 mm²
Height - Overall Shipping 3705 mm²
Height - Top of Cab 3423 mm²
Ground Clearance - Tractor 553 mm²
Front of Tractor to Front Axle 3058 mm²
Rim Radius 432 mm²
Axle to Vertical Hitch Pin 432 mm²
Height - Scraper Blade Maximum 522 mm²
Wheel Base 7722 mm²
Length - Overall Machine 12917 mm²
Rear Axle - Rear of Machine 2142 mm²
Bail Length - Maximum (Push-Pull) 1612 mm²
Extended Push Block (Push-Pull) 2786 mm²

Weights - Standard, Tandem

Total Shipping 32865 kg
Tractor Shipping 22677 kg
Scraper Shipping 10118 kg
Total Operating - Empty 33470 kg
Front Axle 22760 kg
Rear Axle 10710 kg
Total Operating - Loaded 57420 kg
Front Axle Weight - Loaded 30433 kg
Rear Axle - Weight - Loaded 26987 kg


Operating Weight 56513 kg

Power Train – Engine

Electronically controlled Caterpillar® engines with ACERT technology, modular radiator with 9 fins per inch, and an Electronic Control Module maximizes power to the cutting edge and exceptional haul road speed.

Power Train – Transmission

Planetary powershift transmission delivers excellent load capability. Redesigned front and rear axles accommodate wider brake shoes and drums. The neutral coast inhibitor and programmable top gear reduce wear while increasing machine performance.

Electronic Controls

Electronic controls improve machine response and provide advanced diagnostic capabilities that result in better machine availability. The Product Link option allows remote monitoring of location, machine system status, and alert indicators.

Operator Station

Convenient control placement and a comfortable work environment are keys to high productivity. Features include Single Lever Implement Control, an air seat suspension and improved instrumentation.


Superior structural design delivers state-of-the-art ride, capacity, and material control while assuring the durability and reliability customers expect from Caterpillar.

Scraper Bowl

Caterpillar Scraper bowls deliver large loads with better retention, excellent material flow, fast cycle times and high productivity. Relocating the implement valve to the draft tube improves access and serviceability.

Auger Arrangement

Provides self-loading capability with the same wide material appetite as an open bowl machine.


The latest electronic monitoring systems, grouped service points, and rugged Caterpillar components simplify maintenance and minimize downtime. New two-piece access doors open easily and stay open for better access.

Customer Support

The best parts availability and the best service capability will help keep your equipment working.

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