The 623F Elevating Scraper is a versatile, fast machine with a two-speed elevator drive and high hydraulic horsepower for maximum hauling and loading performance.


Tractor Engine 3406C
Net Power - Gears 1 - 2 365.0 hp
Gross Power - Gears 1 - 2 383.0 hp
Bore 5.4 in
Stroke 6.5 in
Displacement 893.0 in3
Caterpillar Net Power 365.0 hp
ISO 9249 365.0 hp
EEC 80/1269 365.0 hp
SAE J1349 361.0 hp
DIN 70020 378 PS
Net Power 365.0 hp

Scraper Bowl
Scraper Capacity: Heaped 23.0 yd3
Rated Load 55000.0 lb
Capacity Struck 18.0 yd3
Depth of Cut - max 13.0 in
Width of Cut, to Router Bits 11.5 in
Ground Clearance - max 15.25 in
Cutting Edge thickness 1.38 in.
Hydraulic Penetration Force 33750.0 lb
Depth of Spread - max 15.0 in

1 Forward 3.1 mph
2 Forward 5.6 mph
3 Forward 7.1 mph
4 Forward 9.6 mph
5 Forward 12.9 mph
6 Forward 17.5 mph
7 Forward 23.6 mph
8 Forward 31.9 mph
Reverse 5.4 mph

Total Operating - empty 81250.0 lb
Front Axle 52050.0 lb
Rear Axle 29200.0 lb
Total Shipping 80231.0 lb
Tractor Shipping 52050.0 lb
Scraper Shipping 29200.0 lb
Total Operating - loaded 138745.0 lb
Front Axle Weight - loaded 69985.0 lb
Rear Axle Weight - loaded 68760.0 lb

Length - overall 146.9 in
Width of Flight Face 8.5 in
Length of Flights 89.0 in
Spacing of Flights 20.0 in
Number of Flights 15

Height - overall shipping 140.0 in
Length - overall machine 523.0 in
Width - overall machine 140.0 in
Height - top of cab 133.0 in
Height - scraper blade max. 16.0 in
Width - tractor 117.0 in
Width - inside of bowl 116.0 in
Width - rear tire center lines 87.0 in
Width - outside rear tires 120.0 in
Rim radius 17.0 in
Front of Tractor to Front Axle 17.0 in
Wheelbase 314.0 in
Rear Axle to Rear of Machine 86.0 in

Width - 180° Turn 35.75 ft
Steering Angle - Right 90 Degrees
Steering Angle - Left 85 Degrees
Hydraulic Output 52.0 gal/min
Ground-Driven Secondary Steering System 39.9 gal/min

Service Refill Capacities
Fuel Tank 160.0 gal
Crankcase 9.5 gal
Transmission 19.0 gal
Differential 43.0 gal
Final Drive (each side) 5.0 gal
Wheel Coolant (each) 12.0 gal
Cooling System 22.0 gal
Hydraulic Reservoir 37.0 gal

Bowl Cylinder Bore 6.0 in
Bowl Cylinder Stroke 20.0 in
Floor Cylinder Bore 6.0 in
Floor Cylinder Stroke 53.25 in
Ejector Cylinder Bore 5.0 in
Ejector Cylinder Stroke 47.75 in
Steering Circuit 56.0 gal/min
Scraper Circuit 62.2 gal/min
Cushion Hitch Circuit 8.6 gal/min
Supplemental Steering Circuit 37.0 gal/min
Relief Valve - Steering Circuit 2250.0 psi
Relief Valve - Implement Circuit 2500.0 psi
Compensator Settings - Cushion Hitch Circuit 2300.0 psi
Compensator Settings - Elevator Circuit 5250.0 psi

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.

Cushion Hitch

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

Elevator Mechanism
Work-alone capability reduces the operating cost-per-ton.

Elevator Mechanism

Variable Speed Elevator
Infinitely variable speed elevator, in both forward and reverse, allows the operator to match elevator speed to material.

Ejector Bowl and Sides
Ejector bowl and sides have been raised, improving the load profile by providing better carrying capacity and material retention.

Operator's Station
Comfort and control increase operator efficiency.

Operator's Station

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.

Customer Support

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.



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