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Open Bowl Scrapers

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.

657G Wheel Tractor-Scraper

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Cat® Wheel Tractor-Scrapers to deliver a high rate of productivity.

  • Specification Summary

  • Tractor Engine Cat C18
  • Scraper Engine Cat C15
  • Flywheel Power - Tractor/Scraper 447 kW (600 hp) / 337 kW (451 hp)
  • Net Power 421/447 kW 564/600 hp
  • Product Brochure


Product Details


Tractor Engine Cat C18
Scraper Engine Cat C15

Tractor Engine

Flywheel Power - Tractor/Scraper 447 kW (600 hp) / 337 kW (451 hp)
Net Power 421/447 kW 564/600 hp
Gross Power - Gears 1-2 445 kW
Gross Power - Gears 3-8 471 kW
Net Power - Gears 1-2 421 kW
Net Power - Gears 3-8 447 kW
Bore 145 mm
Stroke 183 mm
Displacement 18.1 l

Scraper Engine

Net Power 306/337 kW 410/451 hp
Gross Power - Gears 1-2 326 kW
Gross Power - Gears 3-8 356 kW
Net Power - Gears 1-2 306 kW
Net Power - Gears 3-8 337 kW
Bore 140 mm
Stroke 165 mm
Displacement 15.2 l

Scraper Bowl

Scraper Capacity - Heaped 33.6 m³
Rated Load 47174 kg
Capacity - Struck 24.5 m³
Depth of Cut - Maximum 440 mm
Width - Cut - To Router Bits 3846 mm
Ground Clearance - Maximum 580 mm
Cutting Edge Thickness 45 mm
Hyd. Penetration Force - 657G 542 kN
Depth of Spread - Maximum 660 mm
Apron Opening 2337 mm
Apron Closure Force 176 kN


Top Speed - Loaded 55.7 km/h
1 Forward 5.6 km/h
2 Forward 10.2 km/h
3 Forward 12.5 km/h
4 Forward 17 km/h
5 Forward 22.7 km/h
6 Forward 30.6 km/h
7 Forward 41.2 km/h
8 Forward 55.7 km/h
Reverse 9.8 km/h


Bowl Cylinder Bore 235 mm
Bowl Cylinder Stroke 950 mm
Apron Cylinder Bore 235 mm
Apron Cylinder Stroke 760 mm
Ejector Cylinder Bore 260 mm
Ejector Cylinder Stroke 1946 mm
Steering Circuit 378 l/min
Scraper Circuit 579 l/min
Cushion Hitch Circuit 48 l/min
Secondary Steering Circuit 243 l/min
Relief Valve - Steering Circuit 13500 kPa
Relief Valve - Implement Circuit 13780 kPa
Compensator Settings - Cushion Hitch Circuit 20700 kPa


Width - 180° Turn - Right 13.6 m
Width - 180° Turn - Left 14.5 m
Steering Angle - Right 90°
Steering Angle - Left 85°

Service Refill Capacities - Tractor

Crankcase 64 l
Transmission 136 l
Differential 136 l
Final Drive - Each 23 l
Cooling System 125 l
Hydraulic Reservoir 303 l
Wheel Coolant - Each 130 l
Windshield Washer 2 l

Service Refill Capacities - Scraper

Fuel Tank - 657G 1597 l
Crankcase 38 l
Transmission 121 l
Differential 168 l
Final Drive - Each 30 l
Wheel Coolant - Each 130 l
Cooling System 89 l


Width - Overall Machine 4344 mm
Width - Tractor 3601 mm
Width - Rear Tire Center Lines 2813 mm
Width - Inside of Bowl 3683 mm
Width - Outside Bowl - Shipping Width 3914 mm
Height - Overall Shipping 4710 mm
Height - Top of Cab 3712 mm
Ground Clearance - Tractor 645 mm
Front of Tractor to Front Axle 3770 mm
Axle to Vertical Hitch Pin 608 mm
Height - Scraper Blade Maximum 680 mm
Wheel Base 9956 mm
Length - Overall Machine 16164 mm
Rear Axle - Rear of Machine 2438 mm
Bail Length - Maximum (Push-Pull) 1836 mm

Weights - Standard, Tandem

Total Shipping 67113 kg
Tractor Shipping 39788 kg
Scraper Shipping 27325 kg
Total Operating - Empty 68384 kg
Front Axle 39881 kg
Rear Axle 28503 kg
Total Operating - Loaded 115558 kg
Front Axle Weight - Loaded 58172 kg
Rear Axle - Weight - Loaded 57386 kg

Weights - Push-Pull

Total Shipping 72804 kg
Tractor Shipping 42472 kg
Scraper Shipping 29061 kg
Total Operating - Empty 72804 kg
Front Axle 42566 kg
Rear Axle 30238 kg
Total Operating - Loaded 119978 kg
Front Axle - Loaded 60856 kg
Rear Axle - Loaded 59121 kg

Operator Station

Redesigned for enhanced operator comfort and productivity

Operator Comfort

  • Ergonomic layout with plenty of room to work.
  • Fatigue fighting low-effort controls with convenient auto-kickouts and detents
  • Air suspension Cat Comfort Seat adjusts and rotates for more comfortable machine operation
  • HVAC, defroster, radio ready are standard


  • Excellent visibility to bail, cutting edge and bowl
  • Transmission hold maintains gear selection for optimum loading performance
  • Dual throttle pedals for independent front and rear engine control
  • Single joystick control replaces three implement levers in previous models
  • Differential lock improves traction, reducing tire slip, wear, and operating costs
  • Hydraulic retarding for braking on grades


  • Hand rails strategically placed for three points of contact
  • Seat adjusts for best visibility and access to controls; integrated seat belt
  • ROPS/FOPS integrated into cab structure
  • Front and rear windshield wipers
  • Optional secondary steering helps maneuver the machine when primary steering is inoperable
  • Four braking systems: primary, secondary, parking and hydraulic retarding (optional)


  • 1) Bowl (up/down), 2) Ejector (forward/back), 3) Thumb rocker switch, apron, 4) Transmission hold, 5) Cushion hitch, Trigger switch (not shown) bail control
  • Simple gauge cluster is easy to read
  • 657G dash can display either front or rear engine data
  • Backlit switches are close at hand
  • Messaging alerts technicians and operator to service needs

Power Train - Engine

Heavy duty diesel technology for performance and efficiency

ACERT™ Technology

  • U.S. EPA Tier 3, EU Stage IIIa emissions compliant
  • Controlled combustion using proven systems, components
  • Cross flow cylinder heads for clean air, better circulation
  • Delivers fuel at the right time and pressure
  • Rate shaping manages emissions in the combustion cycle

Cat C18 Engine - Tractor

  • Excellent power density, load response across the curve
  • High compression ratio improves cold start and performance
  • MEUI fuel injection matches quantity and timing to load
  • Matched to the high efficiency torque converter and electronically controlled power shift transmission, it has the torque rise to power through tough material and provide years of dependable service

Cat C15 Engine - Scraper

  • Strong block and head - 18:1 compression ratio improves cold start performance
  • Coolant, oil flow design improves heat transfer for durability
  • Articulated two-piece piston with forged steel crown improves thermal stability and strength
  • ADEM A4 ECM cold start strategy protects the engine, reduces white smoke and warm up time
  • Automatic altitude compensation
  • Mechanical Hydraulic Electronic Unit Fuel Injectors (MEUI) improve combustion with precise injection and atomization

Engine Speed Lock

Allows the operator to maintain a given engine speed without using the accelerator pedal.

Power Train - Transmission

Integrated electronics monitor the power train extending component life

Planetary Powershift Transmission Is Electronically Controlled

  • Tractor gears 1-2 - converter drive for increased torque, tractor gears 3-8 - direct-drive for drive train efficiency. Scraper gears stay in converter drive for optimum torque
  • Transmission Hold maintains converter drive for max rimpull, or holds current gear for best control
  • Programmable Top Gear manually sets top gear available (3rd-8th) to match conditions or speed
  • Neutral Coast Inhibitor prevents power train overspeeding by synchronizing engine rpm, pump lubrication and drive train speed, preventing under-lubrication
  • Hydraulic Retarder (optional) reduces service brake wear and enhances machine control

Final Drives

  • Outboard-mounted, planetary design reduces torque loads within the power train
  • Double-row roller bearings and Duo-Cone™ seals assure reliability
  • Differential Lock improves traction in slippery conditions, reducing tire wear

Brake Performance

  • Wide brake shoes and brake drums improve brake performance and reduce brake and drum wear
  • Separate front and rear circuits. Secondary brakes engage automatically if service pressure drops
  • Parking Brake features a spring-applied, air-released mechanism that operates the service brakes

Torque Converter

Increases rimpull and shortens load times, and eliminates engine stall to efficiently deliver power to the ground and move more dirt.

Electronic Controls

Optimized machine performance and advanced diagnostic capabilities

Benefits of Electronic Control Modules (ECMs)

ECMs (3 on the tractor, 2 on rear-powered scrapers) offer:
  • Better fuel economy by optimizing engine settings
  • Greater reliability with operator warnings if problems arise
  • Combining tractor and rear powered-scraper monitoring systems, easy access diagnostics, more durable components improves serviceability
  • Reduced exhaust smoke by optimizing the fuel/air ratio during cranking, starting and acceleration
  • Air filter restriction indicator alerts operator if filter exceeds allowable limit
  • Periodically raises engine rpm during low idle to keep the batteries fully charged

Combined Electronic Monitoring System (EMS III)

Monitors both the tractor and scraper status on the 657G; access fault codes from one location. The tractor and powered scraper use the same controller for parts commonality and easier servicing.

Product Link Ready

This wireless system lets the customer track location, service meter hours and machine health information. Can also issue alerts if the machine is operated beyond owner defined time and location limits.

Easy Access Diagnostics Means Faster Problem Solving

Diagnostic codes, via the Electronic Technician (Cat ET), and a radio call can often let the service technician know which tools, manuals, and possibly even replacement parts to bring.

Cushion Hitch

Superior design and construction delivers long term durability

Cushion Hitch

The electronically actuated cushion hitch has a parallelogram-type linkage for exceptional strength. Vertically mounted hydraulic cylinder transfers road shocks to nitrogen accumulators. Nitrogen accumulator absorbs and dampens road shocks, thus preventing these loads from being transmitted to the operator.
  • controlled oil flow dampens rebound oscillation
  • leveling valve applies pressure via an orifice to automatically center piston in the load cylinder
  • steel castings are used to eliminate many welded joints and increase strength
  • double-kingbolt design withstands high external forces and simplifies installation and removal

Lockout Switch

An operator-selectable lockout switch, located on the joystick, locks the cushion hitch down for improved cutting edge control when loading or dumping.

Scraper Bowl

Designed for fast and precise loading and controlled ejection

Bowl Design

Excellent productivity, improved draft arm protection, and better load retention. Low profile design offers less resistance to incoming materials, while cellular construction adds strength and dent resistance to bowl sides and floor.

Bulldozer Ejection System

Combines constant spreading control with minimum carryback.

Overflow Guard

An available overflow guard on the scraper bowl helps retain material, and limits spills onto the rear of the scraper.


Where material types include rocky/abrasive material, or become traction-limited, push loading a 657G with a Cat D10 or D11 will optimize tire wear and productivity.

Cutting Edges and Cat Ground Engaging Tools (GET)

May be adjusted according to job conditions. Smooth and serrated cutting edges with available tip options can be applied to match job site conditions. For most efficient loading, use the thinnest cutting edge that provides satisfactory wear life and impact resistance.

Tandem Engines

Tandem engine machines improve cycle times on grades and in slippery underfoot conditions. Also improves the machine's loading characteristics in tough materials like clay.

Material Appetite

Well suited to handle a wide variety of material from clay to shot rock.

Coal Bowl

Purpose-built to meet application specific needs

Bowl Capacity

High-capacity bowls, built longer and taller than earth-moving bowls, allow the 657G to achieve rated load in light weight coal.

Wheel Tractor-Scraper Benefits

  • High speed, self-loading productivity for stockpile and feeder management
  • Coal pile compaction
  • Bowl capacity 56 m³ (73 yd³) heaped
  • All-wheel drive allows the machine to work in poor underfoot conditions and operate on piles of loose coal


Two machines acting as a single self-loading system

Combined Power Increases Production

Push-pull applies the power of four engines to a single cutting edge. The benefit is realized in tough-to-load material and fast loading of both machines. Push-pull applications have the potential to produce the lowest cost per unit volume, and a high rate of production.

Hydraulically Actuated Bail

The push-pull arrangement uses a hydraulically actuated bail and cushioned plate to push, and a hook that is attached to the rear of the scraper to pull.


Easy to Maintain - Easy to Service

Engine Service Points

  • Maintenance/service points grouped on the right side
  • Grouping fluid fill and check points, filters and sampling ports shortens maintenance times
  • Electronic Monitoring System (EMS) provides real-time information to the operator of system warnings
  • Electronic Technician (Cat ET) displays real-time system data to better inform the service technician

Implement Valve Relocation

The implement valve is relocated from the tractor to the top of the scraper draft tube, reducing the number of hoses and tubes crossing over the gooseneck. This reduces potential leak points and improves service access.

Scraper Electrical Harness and One Piece Power Block

The flexible ribbon wiring harness oscillates with the machine, and polyurethane boots offer better protection against the elements. The jumpstart receptacle and disconnect switch are integrated into a one-piece power block, with a lockable cover, for better electrical integrity and serviceability.

Electro-Hydraulic Implement Control Simplifies Serviceability

Removing the cab pilot valve and associated lines improves reliability and reduces noise. The high efficiency electro-hydraulic pilot oil filter provides cleaner oil for the pilot system.


Cat Dealer services

Product Support

You will find nearly all parts at your dealer parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize machine down time. Save money with genuine Cat Reman parts. You receive the same warranty and reliability as new products at substantial cost savings.


Better operating techniques can help maximize your machine investment. Cat dealers have resources to help you increase productivity, and Caterpillar offers certified operator training classes on most machines.

Machine Selection

Compare machines under consideration before purchase. Cat dealers can estimate component life, preventive maintenance cost, and the true cost of lost production.


Consider the financing options available as well as day-to-day operating costs. Look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over time.

Maintenance Services

Talk to your dealer about the range of available maintenance services like S·O·SSM Analysis and Coolant Sampling. Repair option programs guarantee the cost of repairs up front.

Customer Support Agreements

Cat dealers offer a variety of product support agreements that can meet customers' specific needs. These plans can cover the entire machine, including attachments, to help protect your investment.


Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.
    •  Alarm, backup
    •  Alternator, 80 amp - tractor engine
    •  Alternator, 50 amp - scraper engine
    •  Batteries Tractor (4), 12V Maintenance Free, High Output
    •  Batteries Scraper (4), 12V Maintenance Free, High Output
    •  Electrical System, 24V
    •  Lighting System - Tractor
    •  Lighting System - Scraper
    •  Starting Receptacle - tractor and scraper engines
  • Alarm, backup
    • Alternator, 80 amp - tractor engine
      • Alternator, 50 amp - scraper engine
        • Batteries Tractor (4), 12V Maintenance Free, High Output
          • Batteries Scraper (4), 12V Maintenance Free, High Output
            • Electrical System, 24V
              • Lighting System - Tractor
                • Lighting System - Scraper
                  • Starting Receptacle - tractor and scraper engines
                    • OPERATOR ENVIRONMENT
                      •  Air Conditioner (includes heater and defroster)
                      •  Automotive style fuse panel with fuse puller
                      •  Cigarette Lighter and Ashtray
                      •  Coat Hook
                      •  Cup holder
                      •  Diagnostic Connection Port (12V)
                      •  Dome Courtesy Light
                      •  Engine speed lock
                      •  Fan defroster
                      •  Gauge Group
                      •  Horn
                      •  Implement Control Joystick
                      •  Rearview Mirrors
                      •  Radio Ready
                      •  2 radio openings, speakers, and 5-amp converter
                      •  ROPS Cab with Sound Suppression and Pressurization
                      •  Static Seatbelt
                      •  Scraper Engine Controls
                      •  Seat, Air Suspension, Caterpillar Comfort, cloth
                      •  Steering Wheel - tilt and telescoping
                      •  Storage Compartment
                      •  Transmission Hold
                      •  Windows - sliding side, swing out
                      •  Windshield - laminated glass
                      •  Windshield Wiper/Washer - front and rear
                      •  Wrist Rest/Grab Handle
                    • POWER TRAIN
                      •  Tractor
                      •  Scraper
                    • OTHER STANDARD EQUIPMENT
                      •  Tractor
                      •  Scraper
                    • Push-pull arrangement
                      • Steering, secondary
                        • Extended Life Coolant, -50° C (-58° F)
                          • Lock, Steering
                            • Push-Pull Arrangement with Rear Radiator Guard
                              • Product Link

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