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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. 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.

621F Wheel Tractor-Scrapers

Cat scraper bowl design combined with hydraulic ejection provides fast cycle times for high productivity.

Product Details

Tractor Engine

Gross Power - Gears 1-2 259 kW
Net Power - Gears 1-2 246 kW
Caterpillar Net Power 246 kW
ISO 9249 246 kW
EEC 80/1269 246 kW
SAE J1349 244 kW
Bore 137 mm
Stroke 165 mm
Displacement 14.6 L

Scraper Bowl

Scraper Capacity: Heaped 15.3 m3
Rated Load 21800 kg
Capacity Struck 10.7 m3
Depth of Cut - max. 333 mm
Width of Cut, to Router Bits 3023 mm
Ground Clearance - max. 522 mm
Cutting Edge - thickness 29 mm
Hyd. Penetration Force - 621G 150.4 kN
Depth of Spread - max. 1780 mm
Apron Opening 1780 mm
Apron Closure Force 107 kN


1 Forward 5 km/h
2 Forward 9 km/h
3 Forward 11.4 km/h
4 Forward 15.4 km/h
5 Forward 20.8 km/h
6 Forward 28.2 km/h
7 Forward 38 km/h
8 Forward 51.3 km/h
Reverse 9.2 km/h


Tractor Engine 3406C


Operating Weight 32085 kg

Weights - Standard, tandem

Total Shipping 31591 kg
Tractor Shipping 21743 kg
Scraper Shipping 9848 kg
Total Operating - empty 32085 kg
Front Axle 21818 kg
Rear Axle 10267 kg
Total Operating - loaded 53860 kg
Front Axle Weight - loaded 28546 kg
Rear Axle Weight - loaded 25314 kg


Width – Overall Machine 3454 mm
Width – Tractor 2972 mm
Width - rear tire center lines 2210 mm
Width – Inside of Bowl 2946 mm
Width – Outside Rear Tires 3048 mm
Height – Overall Shipping 3353 mm
Height – Top of Cab 3378 mm
Ground Clearance – Tractor 559 mm
Front of Tractor to Front Axle 3175 mm
Axle to Vertical Hitch Pin 432 mm
Height – Scraper Blade Maximum 533 mm
Wheelbase 7722 mm
Length - overall machine 12878 mm
Rear Axle to Rear of Machine 2159 mm

Service Refill Capacities – Tractor

Crankcase 36 L
Transmission 72 L
Differential 163 L
Final Drive (per side) 19 L
Cooling System 83 L
Hydraulic Reservoir 140 L
Wheel Coolant (each) 45 L


Width - 180° Turn 10.9 m
Steering Angle – Right 90°
Steering Angle – Left 85°
Hydraulic Output 197 L/min
Ground-Driven Secondary Steering System 150 L/min


Bowl Cylinder Bore 152 mm
Bowl Cylinder Stroke 813 mm
Apron Cylinder Bore 184 mm
Apron Cylinder Stroke 600 mm
Ejector Cylinder Bore 165 mm
Ejector Cylinder Stroke 1549 mm
Steering Circuit 197 L/min
Scraper Circuit 284 L/min
Cushion Hitch Circuit 35.5 L/min
Secondary Steering Circuit 140 L/min
Relief Valve - Steering Circuit 15500 kPa
Relief Valve - Implement Circuit 14.8 kPa


The six-cylinder, turbocharged engine is built for power, reliability and economy.

Proven Cat Engines

Proven Cat engines feature high torque rise for excellent lugging in tough loading applications and are designed to work long hours in the most demanding job conditions.

Displacement-to-Horsepower Ratio

High displacement-to-horsepower ratio reduces stress for long engine life.

Fuel System

Direct injection fuel system is adjustment-free, with individual injection pumps and valves.


Automatic, variable-injection timing delivers fuel as needed for maximum fuel efficiency when engine rpm varies between cut or fill work and high speed hauling.

Fuel/Air Ratio Control

Fuel/air ratio control is tamper resistant. Break-off blots and seal wires protect the control from adjustments that will not meet emissions regulations.


Turbocharger air flow is matched with the horsepower rating for improved performance and lower emissions.

Exhaust Ports

Exhaust ports have stainless sleeves to reduce heat rejection, resulting in less heat transfer to the jacket water system.

Cooling Jets

Dual-tube cooling jets in the block provide more oil to the bottom of the piston for better cooling.

Front Engine Support Group

Front engine support group is isolation-mounted to reduce vibration transfer.

Ground-Level Engine Shutoff Switch

Ground-level engine shutoff switch provides convenience and emergency access.


Laminated Thermo-Shield improves tractor protection by reducing the temperature of exposed engine surfaces, cools engine and operating compartments, improves hose and wiring life.


Smooth, automatic shifts for top production

Eight-Speed Power Shift Transmission

Eight-speed power shift transmission provides automatic, on-the-go shifting for simple, reliable operation. It also eliminates torque converter drive at haul road speeds above 5 mph (8km/h).

Neutral Coast Inhibitor Control

Neutral coast inhibitor control utilizes a ground speed sensor which automatically downshifts the machine to the current ground speed until torque converter drive speed is reached.

Top Gear Control

Top gear control helps prevent shifting above a programmed gear to better regulate haul road speeds.

Directional Shift Management

Directional shift management reduces drivetrain stress during an aggressive directional shift.

Electronic Programmable Transmission Control (EPTC II)

The Electronic Programmable Transmission Control (EPTC II) records both current and intermittent faults.

Cushion Hitch

Smoother ride improves productivity.


Caterpillar cushion hitch design dampens shocks to provide a smoother ride. The result is higher speed capability, less machine wear and increased productivity.

Auger Scraper Arrangement

Excellent self-loading capability in a wide range of material.

Optional Auger Mechanism

An optional auger mechanism in the bowl improves self-loading capabilities by lifting material off the cutting edge and carrying it to the top of the load.

Operator's Station

Comfort and control increase operator efficiency.


Sound suppressed, rubber-mounted ROPS cab reduces sound and vibration for comfortable, shift-long operation.

Electronic Monitoring System

The electronic monitoring system checks important machine systems and provides a three-level alert system.

Hydraulic Servo-Steering System

Hydraulic servo-steering system provides low-effort, automotive feel and excellent maneuverability.

Telescopic Steering System

The telescopic steering system is height adjustable and tilts at knee level for enhanced operator comfort and easy entry and exit.

Implement Controls

Pilot-operated implement controls can reduce operator fatigue by requiring a very low effort to actuate a machine function.


Air suspension seat is multi-adjustable.

Radio Ready Arrangement

Radio ready arrangement includes speakers, a 5-amp converter and two radio openings. A 15/25-amp converter is available from Custom Products.


Simplified service means more productive uptime.

Service Features

There are many convenient service features that keep these machines on the job.

O-ring Face Seals

O-ring face seals help make these machines "dry".

Hydraulic Chain Adjuster

New hydraulic chain adjuster is easily adjusted using a grease gun, reducing service time and improving overall chain life.

Centralized Lubrication Blocks

Centralized lubrication blocks for the hitch and steering reduce lube time.

Service Points

Service points for the engine are grouped on the righthand side for easy access.

Platforms and Handholds

Service platforms and numerous handholds for easy access and safety.

Folded Core Radiator

Folded core radiator allows individual cores to be replaced as a module which reduces service time and expense.

Sealed Floor Rollers

Sealed floor rollers eliminate lubrication.

Customer Support

Unmatched in the industry.

Parts Availability

Most Cat parts are immediately available from any dealer. Cat dealers rely on our worldwide computer network to find parts instantly and minimize machine downtime.

Machine Management Services

Cat dealers help manage your equipment investment with effective preventive maintenance programs.

Flexible Financing

Your dealer can arrange affordable financing for the entire Caterpillar product line.


Cat is committed to provide the most dependable machines on the market.


Optional retarder extends brake life when working on severe, downhill slopes.

Component Commonality

Increased component commonality with other Cat scrapers improves parts availability.


Rounded off bumpers reduce hooking into high walls.

Ground-Level Engine Shut-Offs

Ground-level engine shut-offs for operator convenience and emergency access.


Extensive use of castings in the frame, hitch and bowl provides long service life.

Wiring Harness and Hose Assemblies

Wiring harness and hose assemblies run down the draft arms to eliminate the need for "jump-over" lines which can reduce hydraulic system efficiency.


Standard tires provide the maximum flotation.

Scraper Driveline Guard

Scraper driveline guard protects the output case, differential and ejector cylinder which can minimize driveline maintenance costs.

Laminated Thermo-Shield

Laminated Thermo-Shield helps keep surface temperatures in the engine compartment below the flash point of diesel fuel.
Built for it