Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing the Cat 637E Series II Coal Scraper to consistently deliver high productivity at the lowest cost per ton.

637E Series II

Flywheel Power: Tractor/Scraper 365 kW (490 hp)/186 kW (250 hp)
Net Power Tractor Gears 1-2 450 hp
Tractor Engine Cat® 3408E
Scraper Engine 3306
Gross Power Tractor Gears 1-2 475 hp
Gross Power Tractor Gears 3-8 515 hp
Gross Power Tractor 475 hp
Gross Power Scraper 270 hp
Net Power Tractor Gears 3-8 490 hp

Operating Specifications
Scraper Capacity: Heaped 50 yd3
Top Speed (Loaded) 34.1 mph
Rated Load 75000 lb
Scraper Capacity - struck 41 yd3

Operating Weight - loaded, approx. 113580 lb

Fuel Tank
Fuel Tank Capacity Scraper 335 gal

Power Train
Proven components combine to deliver the most durable, reliable power train in the industry, keeping costs low and production high.

Power Train

Proven Cat engines provide the power and torque rise for excellent lugging in tough loading conditions.

Fuel System
The fuel system and Electronic Control Module on the 3408E tractor engine economically and precisely deliver fuel.

Injection Pressures
High injection pressures, independent of engine speed, decrease smoke and emissions while improving response.

Variable Injection Timing
Variable injection timing and duration improve fuel efficiency and cold starting, decrease smoke and emissions.

Injection Rate Shaping
Injection rate shaping reduces emission and engine noise.

Mechanical Parts
Fewer mechanical parts in the fuel system improves reliability.

Electronic Control
Electronic control provides automatic altitude deration and automatic air filter restriction deration.

Multiple Horsepower Ratings
Multiple horsepower ratings limit output in first and second gears unless the operator has the auger or elevator engaged.

Neutral Start Control
Neutral start control prevents engine from starting unless transmission is in neutral.

Throttle Back-up
Throttle back-up provides the operator with a preset engine speed control in the event of a throttle input failure.

Throttle Lock
The throttle lock allows the operator the capability of locking both engines at any operating level.

Directional Shift Management
Directional shift management prevents the operator from shifting out of neutral when engine rpm is above a preset level.

Controlled Throttle Shifting
Controlled throttle shifting increases drivetrain life by reducing the fuel injection rate just prior to shifting.

Automatic Ether Starting Aid
Automatic ether starting aid greatly improves cold weather starting.

Electronic Ground Level Shutoff
Electronic ground level shutoff enables the operator to stop the engine from the ground with the flip of a switch.

Steel Spacer Plate
Steel spacer plate between the block and head eliminates the need for counterbores and helps prevent associated cracking problems.

Oil-Cooled Pistons
Oil-cooled pistons and full-length water-cooled cylinder liners provide maximum heat transfer for longer component life.

The aftercooler lowers intake charge air temperature to increase power and reduce thermal stresses that can cause premature wear of pistons, rings, and liners.

Engine Oil Cooler
Engine oil cooler maintains optimum oil temperature for proper cooling and longer lubricant life.

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

Direct Injection Fuel System
Direct injection fuel system is adjustment-free with individual injection pumps and valves.

Optional Hydraulic Retarder
An optional hydraulic retarder can extend brake life.

Eight-speed power shift transmission provides automatic, on-the-go shifting for simple, reliable operation.

Neutral Coast Inhibitor Control
Neutral coast inhibitor control helps prevent the transmission from shifting to neutral at speeds above 8.1 km/h (5 mph).

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

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

Electronically Controlled Cushion Hitch
Smoother ride improves productivity.

Electronically Controlled Cushion Hitch

The Caterpillar electronically controlled cushion hitch design dampens shocks to provide a smoother ride.

Nitrogen Accumulators
Nitrogen-over-oil accumulators absorb and dampen road shocks.

Cushion Hitch Lock
Electronically controlled cushion hitch locks down for positive control of the cutting edge during loading and dumping.

Double Kingbolt Design
Double kingbolt design withstands high external forces and allows easy installation and removal.

Hitch Castings
Extensive use of steel castings eliminates many welded joints, making a strong hitch.

Scraper Bowl
Low, wide, large-capacity scraper bowl design boosts production and tandem power increases efficiency.

Scraper Bowl

Caterpillar Coal Scraper bowls come from the factory especially built for coal handling.

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

Tandem Power
A coal-handling scraper has to keep working around the clock, in all kinds of weather and conditions.

Operator's Station
Comfort and control increase operator efficiency.

Operator's Station

Standard rubber-mounted cab reduces noise and vibration for comfortable, shift-long operation.

Low-effort controls are easily accessible for sure, precise operation.

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

Steering Column
Tilt steering column adjusts to five different positions for operator comfort and control.

A suspension seat delivers a comfortable ride.

Electronic Monitoring System
The Electronic Monitoring System checks important machine systems and provides a three-level warning.

The operator's station includes radio compatible wires in the cab.

Simplified service means more productive uptime.


Fuel Tank
Scraper-mounted fuel tank improves access to tractor engine compartment.

Wiring Harness
Improved wiring harness incorporates color coded and numbered circuits for quick identification, minimum 10-amp fuses and improved connectors.

Diagnostic Connector
Diagnostic connector, with the aid of a service tool, allows quick analysis of the starting and charging circuits.

O-Ring Face Seals
O-ring face seals help keep these machines 'dry'.

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 right side for easy access.

Service Platforms
Service platforms and numerous handholds improve access and safety.

Parts Availability
Increased component commonality with other Caterpillar scrapers/machines improves parts availability.

Engine Shut-offs
Electronic ground-level engine shut-offs for convenient operator and services areas.

Folded core radiator allows individual cores to be replaced as modules, reducing service time and expense.

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

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

Rounded off bumpers reduce hooking into high walls.

Extensive use of castings in the frame, hitch and bowl provide 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" line which can reduce hydraulic system efficiency.

Standard tires provide the maximum flotation of the available options.

Scraper Driveline Guard
Scraper driveline guard protects the output case, differential and ejector cylinder to help 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.

Complete Customer Support
When you buy a Cat machine, you get Caterpillar's total commitment to customer support.

Complete Customer Support

Caterpillar Dealer
Your Caterpillar Dealer offers a wide range of services that can be set up under a customer support agreement when you purchase your equipment.

Make detailed comparisons of the machines you are considering before you buy.

Look past the initial price. Consider the financing options available as well as day-to-day operating costs.

Improving operating techniques can boost your profits. Your Cat dealer has training videotapes, literature and other ideas to help you increase productivity.

More and more equipment buyers are planning for effective maintenance before buying equipment.

Repair, rebuild or replace? Your Cat dealer can help you evaluate the costs involved so you can make the right choice.

Product Support
You will find nearly all parts at our dealer parts counter.



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