Cat 657G


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Tractor Engine Cat® C18 ACERT™
Scraper Engine Cat C15 ACERT
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 1-2 596 HP
Gross Power - Gears 3-8 632 HP
Net Power - Gears 1-2 564 HP
Net Power - Gears 3-8 600 HP
Bore 5.7 in
Stroke 7.2 in
Displacement 1105 in³
Scraper Engine
Net Power 306/337 kW 410/451 hp
Gross Power - Gears 1-2 437 HP
Gross Power - Gears 3-8 478 HP
Net Power - Gears 1-2 410 HP
Net Power - Gears 3-8 451 HP
Bore 5.5 in
Stroke 6.5 in
Displacement 928 in³
Scraper Bowl
Scraper Capacity - Heaped 44 yd³
Rated Load 104000 lb
Capacity - Struck 32 yd³
Depth of Cut - Maximum 17 in
Width - Cut - To Router Bits 12.7 in
Ground Clearance - Maximum 23 in
Cutting Edge Thickness 1.8 in
Hyd. Penetration Force - 657G 121000 lb
Depth of Spread - Maximum 26 in
Apron Opening 92 in
Apron Closure Force 39200 lb
Top Speed - Loaded 33 mile/h
1 Forward 3.5 mile/h
2 Forward 6.3 mile/h
3 Forward 7.8 mile/h
4 Forward 10.6 mile/h
5 Forward 14.1 mile/h
6 Forward 19 mile/h
7 Forward 25.6 mile/h
8 Forward 34.6 mile/h
Reverse 6.1 mile/h
Bowl Cylinder Bore 9.25 in
Bowl Cylinder Stroke 37.4 in
Apron Cylinder Bore 9.25 in
Apron Cylinder Stroke 29.92 in
Ejector Cylinder Bore 10.24 in
Ejector Cylinder Stroke 76.61 in
Steering Circuit 99.9 gal/min
Scraper Circuit 153 gal/min
Cushion Hitch Circuit 12.7 gal/min
Secondary Steering Circuit 64.2 gal/min
Relief Valve - Steering Circuit 1959 psi
Relief Valve - Implement Circuit 1999 psi
Compensator Settings - Cushion Hitch Circuit 3002 psi
Width - 180° Turn - Right 44.62 ft
Width - 180° Turn - Left 47.57 ft
Steering Angle - Right 90°
Steering Angle - Left 85°
Service Refill Capacities - Tractor
Crankcase 17 gal (US)
Transmission 36 gal (US)
Differential 36 gal (US)
Final Drive - Each 6 gal (US)
Cooling System 33 gal (US)
Hydraulic Reservoir 80 gal (US)
Wheel Coolant - Each 34.3 gal (US)
Windshield Washer 0.5 gal (US)
Service Refill Capacities - Scraper
Fuel Tank - 657G 421.9 gal (US)
Crankcase 10 gal (US)
Transmission 32 gal (US)
Differential 44 gal (US)
Final Drive - Each 7.9 gal (US)
Wheel Coolant - Each 34.3 gal (US)
Cooling System 24 gal (US)
Width - Overall Machine 171 in
Width - Tractor 141.77 in
Width - Rear Tire Center Lines 110.75 in
Width - Inside of Bowl 145 in
Width - Outside Bowl - Shipping Width 154 in
Height - Overall Shipping 185.4 in
Height - Top of Cab 146.14 in
Ground Clearance - Tractor 25.39 in
Front of Tractor to Front Axle 148.4 in
Axle to Vertical Hitch Pin 23.94 in
Height - Scraper Blade Maximum 26.77 in
Wheel Base 391.97 in
Length - Overall Machine 636.38 in
Rear Axle - Rear of Machine 95.98 in
Bail Length - Maximum (Push-Pull) 72.28 in
Weights - Standard, Tandem
Total Shipping 147959 lb
Tractor Shipping 87717 lb
Scraper Shipping 60242 lb
Total Operating - Empty 150761 lb
Front Axle 87924 lb
Rear Axle 62837 lb
Total Operating - Loaded 254761 lb
Front Axle Weight - Loaded 128246 lb
Rear Axle - Weight - Loaded 126515 lb
Weights - Push-Pull
Total Shipping 160505 lb
Tractor Shipping 93635 lb
Scraper Shipping 64068 lb
Total Operating - Empty 160505 lb
Front Axle 93842 lb
Rear Axle 66663 lb
Total Operating - Loaded 264505 lb
Front Axle - Loaded 134165 lb
Rear Axle - Loaded 130340 lb


Operator Station

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

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

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

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.
986K Technology Solutions

Cushion Hitch

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

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

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


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.


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.


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.

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