®®

EngineTractor Engine Cat® C18 ACERT™

Net Power 421/447 kW 564/600 hpScraper Engine Cat C15 ACERT

Net Power 306/337 kW 410/451 hp

Scraper BowlHeaped Capacity 33.6 m3 44 yd3

Rated Load 47 200 kg 104,058 lb

657GWheel TractorScraper

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657G Wheel Tractor ScraperResponsible, productive earthmoving machines, built to last.

Quick loading, high travel speeds and theability to load and dump on the run yieldfast cycle times, allowing Caterpillar®

Wheel Tractor-Scrapers to consistentlydeliver high productivity.

Auger Arrangement

Provides self-loading capability withthe same wide material appetite as anopen bowl machine. pg. 13

Push-Pull Arrangement (657G)

For maximum production capability,Caterpillar offers an optional push-pullarrangement for the 657G, which allowstwo push-pull scrapers to act as a self-loading machine. pg. 12

Structures

Superior structural design delivers state-of-the-art ride, capacity, and materialcontrol while assuring the durabilityand reliability customers expect fromCaterpillar. pg. 7

Power Train – Transmission

Electronic controls switch fromconverter drive to direct drive based ongear selection, maximizing efficiencyand power application. Tractor andscraper engines are synchronized forsmooth operation and longer servicelife. pg. 6

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Power Train – Engine

The C18 and the C15 engines withACERT™ Technology works at thepoint of combustion to optimize engineperformance. Matched with the torqueconverter and power shift transmission,it provides years of dependable andefficient service. pg. 4

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✔ New Feature

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Customer Support

Caterpillar dealers have the parts andservice capabilities to keep your wheeltractor-scrapers working. pg. 15

Serviceability

Grouped service points and easy access,the latest electronic monitoring systemsand rugged Caterpillar componentssimplify maintenance and minimizedowntime. pg. 14

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Scraper Bowl

Caterpillar® Scraper bowls are designedfor excellent material flow and retentionfor fast cycle times and highproductivity. pg. 11

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Electronic Controls

The electronic controls respond tooperator commands and input fromon-board sensors to optimize machineperformance. In addition, the electroniccontrols provide advanced diagnosticcapabilities that result in better machineavailability. pg. 10

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Operator Station

Convenient control placement and acomfortable work environment are keysto high productivity. Features includeelectro-hydraulic controls, an availableair seat suspension and advancedinstrumentation. pg. 8

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C18 Tractor Engine. The tractor for the657G is powered by the C18 enginewith ACERT™ Technology. The largedisplacement and high torque rise allowthe scraper to cut through tough material.Matched to the high efficiency torqueconverter and electronically controlledpower shift transmission, it will provideyears of dependable service.

C15 Scraper Engine. The 657G istandem-powered, adding a Cat C15engine with ACERT Technology forthe scraper. The C15 gives the 657Gadditional power to assist in loading aswell as improve hauling performance.

ACERT™ Technology. Caterpillaroptimizes engine performance whilemeeting U.S. EPA Tier 3 and EuropeanUnion Stage IIIA regulations. ACERTTechnology reduces emissions duringthe combustion process by usingadvanced technology in the air and fuelsystems, in conjunction with integratedelectronics. Caterpillar meets emissionregulations at the combustion sourcerather than recycling exhaust gases.

Dual Horsepower. The C18 and C15engines have dual horsepower capabilitywith the low power setting in torqueconverter drive and the high powersetting in direct drive. If the augeris engaged while the machine is intorque converter drive, the machineautomatically goes to the highpower setting.

Electronic unit injector

Mechanical Electronic Unit Injection(MEUI). The MEUI system with variableshaped injection patterns provides foroptimum combustion based on altitudeand temperature. The Cat MEUI fuelsystem is a highly evolved fuel systemwith a proven record of reliability inthe field. The system combines thetechnical advancement of an electroniccontrol system with the simplicity ofdirect mechanically controlled unit fuelinjection pressure. These features allowthe C18 and C15 to completely controlinjection timing, duration and pressure.

Electronic Control Module. The ECMresponds to operator commands andengine sensor input to optimize engineand machine performance. This advancedengine management software controlsand protects the engine at all timesagainst cold starts, high altitudeoperations and air filter pluggingby monitoring:

• injection timing and pressure

• engine cooling fan speed

• ether starting aid

• hydraulic pumps

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A combination of innovations working at the point of combustion, ACERT™ technologyoptimizes engine performance while meeting regulations for off-road applications.

Power Train – Engine

Cat C18 engine with ACERT™ Technology

ADEM™ A4 Control Module.Controls engine rpm by adjusting thefuel duration, which results in quickerstarts in hot and cold weather, betterfuel economy, better operator response,and automatic compensation for altitudeand filter plugging.

Reduced Exhaust Smoke.The ADEM A4 controller readselectronic sensors to determine theoptimum fuel/air ratio. Fuel is preciselycontrolled during cranking, starting andacceleration to reduce smoke. The EngineElectronics are faster and more efficientthan mechanically controlling thegovernor rack position.

Ether Starting Aid. The ADEM A4controller activates the ether injectionsystem during engine cranking toenhance cold weather starting.

Control Throttle Shifting (CTS).Automatically synchronizes enginespeed to transmission speed duringshifting to reduce power train stress andincrease component life. In addition itresults in a smoother ride for the operator.

Directional Shift Management.Regulates engine speed to preventdamage caused by high-speeddirectional changes.

Low Battery Elevated Idle.The ADEM A4 controller automaticallycompensates for low alternator outputat low idle by raising the rpm forbrief intervals to keep the batteriesfully charged.

Altitude Compensation. The systemde-rates fuel delivery as a function ofbarometric pressure as sensed by thesystem’s atmospheric pressure sensor.No manual adjustment is required.Auto deration prevents excessivecombustion temperatures that couldresult in component damage.

Diagnostic Capability. Cat® ElectronicTechnician (Cat ET) is used to displayreal-time pressures, temperatures, fuelsettings and diagnostic messages aswell as a historical information such asengine over-speeds, overheating, low oilpressure and air filter restriction events.

Fuel Economy. Electronic controlsoptimize the timing setting for varyingload conditions. The ADEM A4controller matches timing to the load onthe engine, engine rpm and temperature.

Air Filter Restriction. ADEM A4controller monitors air filter restrictionand sends a warning message to theElectronic Monitoring System (EMS III)to alert the operator if the restrictionexceeds the allowable limit.

Automatic Belt Tensioning. Both thetractor and scraper engines haveautomatic belt tensioning rather thanmanual tensioning. The number of beltshas been reduced to two on the tractor,and two on the scraper. Fan drivebearings both the tractor and scraperengines with ACERT™ technologyeliminate servicing requirements.

One-Piece Power Block. The jumpstartreceptacle and disconnect switch areintegrated into one-piece power blockthat provides better electrical integrityand serviceability. The disconnectswitch with lockable cover locks outall power for servicing.

NGMR Engine Cooling System.The standard radiator for the tractor isthe Next Generation Modular Radiator(NGMR), which features 9 fins per inchrather than 33 fins per inch found onprevious models. The increased radiatorfin spacing for both the tractor and thescraper reduces clogging in severeapplications. Two-piece service doorsimprove access to clean out debris.

Scraper Radiator. The scraper alsohas an NGMR radiator, which features9 fins per inch.

Extended Oil Change Interval.Oil change intervals in both the C18 andC15 engines can be extended to 500 hourswith the use of S•O•SSM analysis.

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Transmission. Electronically controlledCaterpillar planetary powershifttransmission with eight forward andone reverse speed. Tractor gears 1 & 2operate in converter drive for increasedtorque capability during cut and filloperations. Gears 3-8 operate in direct-drive for drive train efficiency duringthe haul. All scraper gears operate inconverter drive for increased torquecapability during the cut and fill.

Synchronized Scraper Transmission.The scraper transmission is electronicallycontrolled by the tractor transmission,synchronizing the scraper transmissiongear selection with that of the tractortransmission. The scraper transmissioncannot be shifted manually. A neutral/runswitch, located in the cab, allows theoperator to disengage the scrapertransmission.

Planetary Design. Provides largercontact area between gears thancountershaft transmissions for greaterload-carrying capacity.

Transmission Hold. Incorporated into thejoystick controller, Transmission Holdallows the operator to maintain converterdrive for increased rimpull, or hold thecurrent gear for enhanced control.

Programmable Top Gear Selection.Allows the operator to manually set thetop gear (3rd – 8th) available to matchconditions or to match the hauling speedof the fleet to specific job-site needs.

Retarder. The hydraulic retarder can beused to slow the ground speed of themachine when entering the cut or fillarea to allow the transmission todownshift. It also reduces service brakewear and enhances machine control.

Differential Control. Electronic differentiallock helps prevent the drive wheelsfrom spinning in poor underfootconditions. The operator engages thedifferential lock with a foot controllocated in the cab.

Neutral Coast Inhibitor. Prevents thetransmission from shifting into neutralif the operator selects neutral whilemoving. The transmission control willselect the proper gear for the givenengine rpm and ground speed.

Final Drives. Outboard-mounted,planetary design final drives reducetorque loads on other power traincomponents. Large-capacity, double-row roller bearings and CaterpillarDuo-Cone® seals deliver exceptionalreliability in the toughest applications.

Independent Brake Systems.Expanding-shoe type brakes use acam-operated design, which is air-appliedand spring released. The secondarybraking system uses independent frontand rear circuits that are automaticallyapplied if the service air pressure dropsto 380 kPa (55 psi). Audible and visualaction alert indicators inform the operatorwhen the service air pressure drops to518 kPa (75 psi).

Parking Brakes. The push-buttonoperated parking brake features aspring-applied, air-released mechanismthat operates the service brakes.

Steering. Full hydraulic power steeringprovides automotive feel with positive,modulated flow control for constantsteering response. An optional secondarysteering system is ground-driven andprovides hydraulic power for steeringif needed.

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Power Train – TransmissionIntegrated electronics allow the machine to monitor the entire power train,reducing component stress and providing a better ride.

Cushion Hitch. The electronicallyactuated cushion hitch incorporatesa parallelogram-type linkage forexceptional strength with nitrogenaccumulators to deliver a smooth ridefor enhanced operator comfort.

• cushion hitch lock down control forpositive cutting edge down pressurewhen loading or spreading

• controlled oil flow dampens reboundoscillation

• leveling valve automatically centerspiston in cylinder for all loads

• steel castings are used extensivelyto eliminate many welded joints andincrease strength

• double-kingbolt design withstandshigh external forces and simplifiesinstallation and removal

Nitrogen Accumulators. Verticallymounted hydraulic cylinder transfersroad shocks to nitrogen accumulators.Nitrogen accumulators absorb anddampen road shocks, thus reducing theshocks being transmitted to the operator.

Lockout Switch. An operator-selectablelockout switch, located on the joystick,locks the cushion hitch for improvedcontrol of the cutting edge duringloading and dumping.

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StructuresSuperior structural design and construction optimize performance and reliability.

1 Load cylinder 2 Hitch castings 3 Scraper gooseneck 4 Nitrogen accumulators 5 Orifice 6 Oil from tractor hydraulic system 7 Leveling valve 8 Free floating pistons

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Multi-Adjustable Seat. The Cat ComfortCloth Seat offers an adjustable seat andarmrests for maximum operator comfort.

• Swivels and locks in four positions(0º – 10° – 20° – 30º) providing theoptimum operating position in thecut or on the haul.

• Adjustable 102 mm (4 in) fore/aftand 203 mm (8 in) vertical height toaccommodate various sized operators.

• Static seat belt is standard.A retractable non-cinching seatbelt is available as an option.

Seat Suspension. The new standard seatsuspension features a high performanceair shock absorber with a self-containedair compressor. For operators requiringadditional damping, dual shock absorbersin the seat suspension are available.

Revised Steering Column. Increaseslegroom a full 89 mm (3.5 in), andreduces knee contact.

Standard Air Conditioning. Standardair conditioning system with relocatedlouvers enhances airflow in the cab.

Storage And Amenities. Convenientstorage location includes space for alunch box and first aid kit. The cab alsohas a cup holder as well as an ashtray.

Visibility. The redesigned hood hassloped corners to maximize visibilitywhile accommodating the lowemissions engine.

The redesigned hood and front shroudare wider to enclose the air-to-airaftercooler (ATAAC), ether starting aid,and lights. The exhaust is located at theback of the hood for good visibility tothe right side.

Instrument Display Panel. Features anew quad-gauge layout showing enginecoolant temp, transmission/torqueconverter oil temp, fuel level, and systemair pressure. The 657G tachometer canmonitor either front or rear enginespeeds. Once the 657G tractor enginehas been started, the operator can startthe rear engine from inside the cabusing a switch on the instrument panel.EMS III can display both front and rearengine information right in the cab.

Logical Control Placement. Placing onlyfrequently used switches and indicatorlights on the instrument panel, and lessfrequently used switches on the overheadconsole improves efficiency andreduces reaching.

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State-of-the-art productivity and operator comfort.

Operator Station

Engine Speed Lock Controller.Enhances operation during long haulcycles by allowing the operator tomaintain a desired engine speed, withoutmaintaining pressure on the throttle.

Simplified Transmission Control.Simplifies gear selection (1st, 2nd,Drive and Reverse) and allowsoperator-defined top gear control.Relocating the gear control to therear increases operator legroom.

Neutral Lock. The neutral lock thumbcontrol must be pressed to move theshifter from neutral. To use the topgear button, the operator must holdthe yellow button until the gear displayindicates the desired top gear. Releasingthe yellow button sets the top gear.

Grab Handle/Hand Rest. The grabhandle/hand rest located next to joystickcontroller helps operators when adjustingseat swivel, and gives them a place torest their hand while on the haul andreturn roads.

Single Lever Implement Control.Simple and easy to operate, the joystickenhances the productivity of operatorsof all skill levels. Requires less force tocontrol the critical scraper functions andrequires less lever travel.

1) Bowl (forward & back)

2) Ejector (side to side)

3) Apron (thumb rocker switch)

4) Transmission Hold

5) Cushion Hitch

6) Rocker switch (not shown – is onfront of joystick)

• Auger (on/off)

• Push-Pull (bail up/down)

* Standard open bowl does not havea rocker switch.

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2 (Forward) 2 (Return)

Joystick Control: positions, switches and buttons

Simplified System. The electricalsystem has been redesigned to utilizethree electronic control modules (ECM)on the tractor instead of four. The rear-powered scraper now has two ECMsrather than three.

Air Filter Restrictor Indicator.ADEM A4 controller monitors air filterrestriction. If the restriction exceeds theallowable limit, it alerts the operatorby sending a message to the ElectronicMonitoring System (EMS III).

Automatic Ether Injection.The ADEM A4 controller activatesthe ether injection system during enginecranking to enhance cold weather starting.

Automatic Altitude Compensation.At high altitudes the system automaticallyde-rates fuel delivery as a function ofbarometric pressure sensed by thesystem’s atmospheric pressure sensor.

Low Battery Elevated Idle.The ADEM A4 controller automaticallycompensates for low alternator outputat low idle by raising the rpm forbrief intervals to keep the batteriesfully charged.

Improved Serviceability. Combinedmonitoring systems, easy accessdiagnostics and more durable componentsmake routine maintenance and servicingsimple and fast.

Combined EMS Monitoring.The Electronic Monitoring System(EMS III) is designed to monitorboth the tractor and scraper from onelocation instead of two. Both the tractorand powered scraper use the samecontroller for parts commonality andeasier servicing.

Easy Access Diagnostics. A variety ofdiagnostic codes are accessible throughthe EMS main display module, via theCat® Electronic Technician (Cat ET).This offers a head start on problemsolving, so with a radio call the servicetechnician can know which tools,troubleshooting guides, and possiblyeven replacement parts to bring tothe machine.

Greater Reliability. The MEUI systemhas fewer moving parts than mechanicalunit injection and requires fewadjustments. The ADEM A4 controllercommunicates with the monitoringsystem (EMS) to warn the operatorshould problems arise, to help avoidmajor damage.

Maintenance. MEUI engines havesignificantly fewer mechanicallycontrolled parts to wear or adjust.These have been replaced by electroniccontrols, reducing maintenance costsand increasing machine availability.

Product Link Ready. Product Link is awireless system that allows the customerto track machine data such as location,service meter hours as well as machinehealth information. The system canautomatically issue alerts when themachine is operated beyond owner-defined time and location limits.

Product Link is available as a factoryattachment or it may be installed in thefield in that there is a mounting locationfor the module as well as an antennaon the machine. A wiring breakout isstandard, eliminating the need to spliceinto existing wires.

Fuel Economy. Electronic controlsoptimize the timing setting for varyingconditions. The ADEM A4 controllermatches timing to the load on theengine, engine rpm and temperature.

Reduced Exhaust Smoke.The ADEM A4 controller readselectronic sensors to determine theoptimum fuel/air ratio. Fuel is preciselycontrolled during cranking, startingand acceleration to reduce smoke.The engine electronics are fasterand more efficient than mechanicallycontrolling the governor rack position.

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Electronic ControlsIntegrated electronic controls provide smooth, consistent shifts through the synchronizationof engine and transmission speeds.

Redesigned Bowl. The redesignedbowl minimizes falling material lodgingbetween the bowl and the draft arm,resulting in premature wear.The modifications also providebetter load retention on level groundor traversing down a grade.

• Low-profile bowl design offers lessresistance to incoming materials.

• Cellular construction adds strengthand dent resistance to bowl sidesand floor.

Bulldozer Ejection System. Cat bulldozerejection system offers constant spreadingcontrol with minimal material carryback. A spill guard helps retain materialand keep it from spilling over onto therear of the scraper (standard on tandemengine scrapers, optional on singleengine open bowl scrapers).

Cutting Edges. May be adjustedaccording to job conditions. The stinger(drop down) position provides goodpenetration and efficient flow of materialinto the bowl whereas the level cuttingedge is used for finish work or veryhigh impact conditions.

Caterpillar Ground Engaging Tools(G.E.T.). A wide variety of GroundEngaging Tools (GET) options suchas standard, serrated, and abrasionresistant material (ARM) are availableto optimize scraper loading in variousmaterials. For example, ARM scrapercutting edges and router bits willprovide up to five times the wear lifeof conventional edges and router bitsin high wear, low impact applications.Depending on applications, the serratedcutting edge may be more cost effectivethan the integrated tooth cutting edge.

Tandem Engine. Two engines ensurethe power to handle steep grades, andmakes possible all wheel drive to handlesoft, slippery underfoot conditions.

Dual Horsepower. The 657G rearengine has dual horsepower capabilitythat results in better performance onthe haul roads.

Material Application. Well suited tohandle a wide variety of material fromclay to shot rock.

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Scraper BowlDesigned for optimum loading, material retention and ejection.

Push-Pull Attachment. This optionalarrangement concentrates the combinedhorsepower of two machines onto onecutting edge. The push-pull attachmentallows two individual machines to actas a self-loading system, typically loadingboth machines in less than a minute.

Flexible Fleet. This system providesa more balanced, flexible fleet usingfewer machines and less investmentthan comparable self-loading orpush-loading systems.

Hydraulically Actuated Bail. The push-pull arrangement uses a hydraulicallyactuated bail and cushioned plate boltedto the front of the tractor, and a hookthat is attached to the rear of the scraper.There is an actuator indicator light onthe dash that will turn on when thetrigger is engaged to actuate thepush-pull bail or auger.

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Push-Pull Arrangement (657G)Caterpillar offers a self-loading arrangement for the 657G.

Versatility. The auger has a widematerial appetite ranging from rockto free flowing material such as sand.

Auger Mechanism. The auger liftsmaterial off of the cutting edge andcarries it to the top of the load for trueself-loading capability. Material isdistributed evenly throughout the bowl,resulting in consistent loads.

Material Handling. The auger actions onthe material produce several benefits:

• wide material appetite, idealfor landfills

• blends the material to help eliminatevoids in the bowl for consistentpayloads

• conditions material which promotescompaction in the fill

• reduces dust and noise during loading

Dual Horsepower. Tractor engineautomatically reverts to the highersetting when the auger motor is engaged.

Slip Limiter Switch. Prevents rear wheelspin during loading.

Hydraulic System. Single hydraulicsystem for entire machine with separateimplement pumps/valves simplifiesmaintenance and improves reliability.

Full-flow Circuits. The hydraulic systemfeatures closed-loop, full-flow hydrauliccircuits powered by gear-type andpiston-type pumps.

Apron. Prevents material spillage andretains fine material far better than anelevating scraper.

Electro-hydraulic Controls. The 657Gfeatures full electro-hydraulic controls,which simplify serviceability andreduce noise by replacing the cab pilotvalves with a single-lever joystickcontrol. The high efficiency oil filterprovides cleaner oil for the pilot system.

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Auger ArrangementExcellent self-loading capability in a wide range of material.

Grouped Service Points. Maintenanceand service points for the engine aregrouped on the right-hand side for easyaccess. They include the engine aircleaner, engine oil check and fill, fuelfilters and priming, coolant level sightglass, window washer bottle, airconditioning dryer cartridge, etherstarting aid canister, engine oil filter,fan drive lubrication, and samplingports for the engine oil and coolant.

• Spin-on fluid filters for all but themain hydraulic filter

• Cab wiring harness redesigned andrelocated for better serviceability

Two-Piece Service Doors. The tractorhas a standard two-piece door on theright side, which allows better accessto service points. The hood is hingedon the front and has spring struts, so thehood easily swings open towards thefront of the machine. This allows betteraccess to those areas located on top ofthe engine.

Electronic Monitoring System (EMS III).Monitors both the tractor and scraperfrom one location instead of two.Both the tractor and powered scraperuse the same controller for partscommonality and easier servicing.

Electro-Hydraulic Implement Control.Simplifies serviceability by removingthe cab pilot valve and associated lines,which also improves reliability andreduces noise. The high efficiencyoil filter provides cleaner oil for thepilot system.

Electronic Technician (Cat ET).The Electronic Technician (Cat ET)Service Tool is useful in troubleshootingexisting problems or identifyingpotential problems by displaying:

• Real-time pressures, temperatures,fuel settings and diagnostic messages

• Historical data such as engine over-speeds, overheating, low oil pressureand air filter restriction events

• More detailed information to theservice technician who can accessCat ET via a laptop computer

Easy Access Diagnostics. A variety ofdiagnostic codes are accessible throughthe EMS main display module, via theCat® Electronic Technician (Cat ET).This offers a head start on problemsolving, so with a radio call the servicetechnician can know which tools,troubleshooting guides, and possiblyeven replacement parts to bring tothe machine.

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ServiceabilityCount on Caterpillar for simplified service and the most productive uptime.

Product Support. You will find nearlyall parts at our dealer parts counter.Cat dealers use a world-wide computernetwork to find in-stock parts to minimizemachine down time. Save money withgenuine Cat Reman parts wheneverpossible. You receive the same warrantyand reliability as new products atsubstantial cost savings.

Machine Selection. Make detailedcomparisons of the machines underconsideration before purchase.Cat dealers can estimate componentlife, preventive maintenance cost,and the true cost of lost production.

Purchase. Look past initial price.Consider the financing options availableas well as day-to-day operating costs.Look at dealer services that can beincluded in the cost of the machineto yield lower equipment owningand operating costs over the long run.

Customer Support Agreements.Cat dealers offer a variety of productsupport agreements, and work withcustomers to develop a plan that bestmeets specific needs. These plans cancover the entire machine, includingattachments, to help protect thecustomer’s investment.

Operation. Improving operatingtechniques can boost your profits.Your Cat dealer has videotapes,literature and other ideas to help youincrease productivity, and Caterpillaroffers certified operator training classesto help maximize the return on yourmachine investment.

Maintenance Services. Talk to yourdealer about the range of availablemaintenance services. Repair optionprograms guarantee the cost of repairsup front. Diagnostic programs such asS•O•SSM Analysis and Coolant Samplingand Technical Analysis help avoidunscheduled repairs.

Replacement. Repair, rebuild orreplace? Your Cat dealer can help youevaluate the cost involved so you canmake the right choice.

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Customer SupportCat dealer services help you operate longer with lower costs.

16 657G Wheel Tractor Scraper specifications

Scraper Bowl

Heaped Capacity 33.6 m3 44 yd3

Rated Load 47 200 kg 104,058 lbStruck Capacity 24.5 m3 32 yd3

Depth of Cut – Max. 425 mm 16.7 inWidth of Cut, to Router Bits 3846 mm 12.7 inGround Clearance – Max. 545 mm 21.5 inCutting Edge – Thickness 22 mm 0.88 inHyd. Penetration Force – 657G 542 kN 121,000 lbDepth of Spread – Max. 680 mm 26.77 inApron Opening 2340 mm 92 inApron Closure Force 176 kN 39,200 lb

Transmission

1 Forward 5.5 km/h 3.4 mph2 Forward 10 km/h 6.2 mph3 Forward 10.9 km/h 6.8 mph4 Forward 14.8 km/h 9.2 mph5 Forward 19.8 km/h 12.3 mph6 Forward 26.9 km/h 16.7 mph7 Forward 36 km/h 22.4 mph8 Forward 55.7 km/h 36 mphReverse 9.7 km/h 6 mph

Hydraulics

Bowl Cylinder Bore 235 mm 9.25 inBowl Cylinder Stoke 950 mm 37.4 inApron Cylinder Bore 235 mm 9.25 inApron Cylinder Stroke 760 mm 29.92 inEjector Cylinder Bore 260 mm 10.24 inEjector Cylinder Stroke 1946 mm 76.61 inSteering Circuit 435 L/min 115 gal/minScraper Circuit 579 L/min 153 gal/minCushion Hitch Circuit 56 L/min 15 gal/minSecondary Steering Circuit 430 L/min 113.6 gal/minRelief Valve – Steering Circuit 13 500 kPa 1,959 psiRelief Valve – Implement Circuit 13 800 kPa 2,000 psiCompensator Setting – 20 670 kPa 3,000 psiCushion Hitch Circuit

• Steering circuit, scraper implement circuit and cushion hitchcircuit measured at 2,000 rpm.

• Optional secondary steering circuit measured at 24 km/h(14.9 mph).

Engine

Tractor Engine Cat C18 ACERT™Scraper Engine Cat C15 ACERT

Tractor Engine

Net Power 421/447 kW 564/600 hpGross Power – Gears 1-2 445 kW 596 hpGross Power – Gears 3-8 471 kW 632 hpNet Power – Gears 1-2 421 kW 564 hpNet Power – Gears 3-8 447 kW 600 hpBore 145 mm 5.7 inStroke 183 mm 7.2 inDisplacement 18.1 L 1,105 in3

• Net power advertised is the power available at rated speedof 1,800 rpm, measured at flywheel when the engine isequipped with fan, air cleaner, muffler and alternator.

• Gross power and net power ratings apply at 1,800 rpm whentested under the specified standard conditions for ISO 9249and EEC 80/1269.

Scraper Engine

Net Power 306/337 kW 410/451 hpGross Power – Gears 1-2 326 kW 437 hpGross Power – Gears 3-8 356 kW 478 hpNet Power – Gears 1-2 306 kW 410 hpNet Power – Gears 3-8 337 kW 451 hpBore 137 mm 5.4 inStroke 171.5 mm 6.8 inDisplacement 15.2 L 928 in3

• Net power advertised is the power available at rated speedof 1,800 rpm, measured at flywheel when the engine isequipped with fan, air cleaner, muffler and alternator.

• Gross power and net power ratings apply at 1,800 rpm whentested under the specified standard conditions for ISO 9249and EEC 80/1269.

17657G Wheel Tractor Scraper specifications

Weights – Push-Pull

Total Shipping 70 395 kg 155,194 lbTractor Shipping 42 023 kg 92,644 lbScraper Shipping 28 372 kg 62,550 lbTotal Operating – Empty 71 554 kg 157,750 lbFront Axle 42 715 kg 94,170 lbRear Axle 28 839 kg 63,580 lbTotal Operating – Loaded 118 729 kg 261,753 lbFront Axle – Loaded 60 552 kg 133,494 lbRear Axle – Loaded 58 177 kg 128,259 lb

Standards

• Standard Rollover Protective Structure (ROPS) whichmeets SAE J320a, SAE J1040 MAY 94, ISO 3471-1986 andISO 3471-1994

• Falling Object Protective Structure (FOPS) which meetsSAE J231 JAN 81 and ISO 3449-1992

• Cab meets OSHA and MSHA limits for operator and soundexposure with doors and windows closed (according toANSI/SAE J1166 May 90). The operator sound pressurelevel is less than 85 dB(A) when measured per ISO 6394or 86/662/EEC.

• Standard air conditioning system contains environmentallyfriendly R134a refrigerant.

• Brakes meet ISO 3450: 1998

Steering

Width – 180° Turn, Right 13.82 m 45 ft 4 inWidth – 180° Turn, Left 14.73 m 48 ft 4 inSteering Angle – Right 90°Steering Angle – Left 85°

• Optional secondary steering system meets SAE J1511(OCT 90) and ISO 5010 (1992) requirements.

Service Refill Capacities – Tractor

Crankcase 60 L 15.85 galTransmission 136 L 36 galDifferential 138 L 36.5 galFinal Drive (per side) 23 L 6 galCooling System 144 L 38 galHydraulic Reservoir 310 L 81.9 galWheel Coolant (each) 130 L 34.3 galWindshield Washer 6 L 1.5 gal

Service Refill Capacities – Scraper

Fuel Tank – 657G 1597 L 421.9 galCrankcase 34 L 8.9 galTransmission 133 L 35 galDifferential 163 L 43 galFinal Drive (per side) 23 L 6 galWheel Coolant (each) 130 L 34.3 galCooling System 110 L 29 gal

Weights – Standard, tandem

Total Shipping 66 615 kg 146,861 lbTractor Shipping 39 969 kg 88,117 lbScraper Shipping 26 646 kg 58,745 lbTotal Operating – Empty 67 774 kg 149,417 lbFront Axle 40 665 kg 89,650 lbRear Axle 27 110 kg 59,767 lbTotal Operating – Loaded 114 949 kg 253,420 lbFront Axle Weight – Loaded 58 624 kg 129,244 lbRear Axle Weight – Loaded 56 325 kg 124,176 lb

18 657G Wheel Tractor Scraper specifications

DimensionsAll dimensions are approximate.

1 Width – Overall Machine 4344 mm 171.02 in2 Width – Tractor 3601 mm 141.77 in3 Width – Rear Tire Center Lines 2633 mm 103.66 in4 Width – Inside of Bowl 3683 mm 145 in5 Width – Outside Bowl 3914 mm 154 in

(shipping width)6 Height – Overall Shipping 4710 mm 185.43 in7 Height – Top of Cab 3712 mm 146.14 in8 Ground Clearance, Tractor 645 mm 25.39 in

9 Front of Tractor to Front Axle 3770 mm 148.42 in10 Axle to Vertical Hitch Pin 608 mm 23.94 in11 Height – Scraper Blade Max. 680 mm 26.77 in12 Wheelbase 9956 mm 391.97 in13 Length – Overall Machine 16 164 mm 636.38 in14 Rear Axle to Rear of Machine 2438 mm 95.98 in15 Bail Length – Max. 1836 mm 72.28 in

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19657G Wheel Tractor Scraper specifications

Model 657G 657GStandard Push-pull

Shipping, with ROPS cab and 10% fuelTractor 60% 60%

39 969 kg 88,117 lb 42 023 kg 92,644 lb

Scraper 40% 40%

26 646 kg 58,745 lb 28 372 kg 62,550 lb

Total 100% 66 615 kg 146,861 lb 70 395 kg 155,194 lbOperating empty, with ROPS cab, full fuel tanks and no operator

Front axle 60% 60%

40 665 kg 89,650 lb 42 715 kg 94,170 lb

Rear axle 40% 40%

27 110 kg 59,767 lb 28 839 kg 63,580 lb

Total 100% 67 774 kg 149,417 lb 71 554 kg 157,750 lbLoaded, based on a rated load of: 47 175 kg 104,003 lb 47 175 kg 104,003 lb

Front axle 51% 51%

58 624 kg 129,244 lb 60 552 kg 133,494 lb

Rear axle 49% 49%

56 325 kg 124,176 lb 58 177 kg 128,259 lb

Total 100% 114 949 kg 253,420 lb 118 729 kg 261,753 lb

*Auger adds approximately 4536 kg (10,000 lb) to total weight.

Weights (approximate)

20 657G Wheel Tractor Scraper specifications

Retarding

To determine retarding performance: Read from gross weightdown to the percent effective grade. (Effective grade equalsactual percent grade minus 1% for each 9 kg/t (20 lb/ton) ofrolling resistance). From this weight-effective grade point,read horizontally to the curve with the highest obtainablespeed range, then down to maximum descent speed theretarder can properly handle.

Gradeability/Speed/Rimpull

To determine gradeability performance: Read from grossweight down to the percent of total resistance. Total resistanceequals actual percent grade plus 1% for each 9 kg/t (20 lb/ton)of rolling resistance. From this weight-resistance point, readhorizontally to the curve with the highest obtainable gear, thendown to maximum speed. Usable rimpull will depend upontraction available and weight on drive wheels.

0 10 20 30 40 50 60

500

200 40 60 80 100 120 140

lb x 1000

0

10

20

30

40

50

60

70

80

90

100

110

0

20

40

60

80

100

120

140

160

180

200

220

240

lb x

1000

kg x

1000

0 5 mph

km/h

100 150 200 250 300

10 15 20 25 30 35

30%

35%

40%

25%

20%

15%

10%

5%

kg x 1000

1

2

34

56

7 8

E L

Tota

l Res

ista

nce

(Gra

de p

lus R

ollin

g Re

sist

ance

)

Rim

pull

657G Gross Weight*37.25R35 Tires

Speed*at sea level

1—1st Gear Torque Converter Drive2—2nd Gear Torque Converter Drive3—3rd Gear Direct Drive4—4th Gear Direct Drive5—5th Gear Direct Drive6—6th Gear Direct Drive7—7th Gear Direct Drive8—8th Gear Direct Drive

E—Empty 67 774 kg (149,417 lb)L—Loaded 114 949 kg (253,420 lb)

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 lb x 1000

km/h0 5 10 15 20 25 30 35 40 45 50

mph0 5 10 15 20 25 30

E L3

4

5

6

15 kg x 10000 30 45 60 75 90 105 120 135

30%35%40%

25%

20%

15%

10%

1%

5%7

8

Effe

ctiv

e Gr

ade

(Gra

de m

inus

Rol

ling

Resi

stan

ce)

657G Retarding*Gross Weight

Speed*at sea level

3—3rd Gear Direct Drive4—4th Gear Direct Drive5—5th Gear Direct Drive6—6th Gear Direct Drive7—7th Gear Direct Drive8—8th Gear Direct Drive

E—Empty 67 774 kg (149,417 lb)L—Loaded 114 949 kg (253,420 lb)

21657G Wheel Tractor Scraper specifications

Standard EquipmentStandard equipment may vary. Consult your Caterpillar dealer for details.

OPERATOR ENVIRONMENTAir conditioner (includes heater and defroster)Automotive style fuse panel w/fuse pullerCigarette lighter and ashtrayCoat hookCup holderDiagnostic connection port (12V)Dome courtesy lightEngine speed lockGauge group

Air pressureConverter/retarder temperatureElectronic Monitoring System (EMS III)Engine coolant temperatureActual transmission gear indicatorFuelSpeedometerTachometerTransmission gear indicator

HornImplement control joystickRearview mirrorsRadio ready2 radio openings, speakers, and 5-amp converterROPS cab with sound suppression and pressurizationStatic seatbeltScraper engine controlsSeat, air suspension, Caterpillar Comfort, clothSteering wheel – tilt and telescopingStorage compartmentTransmission holdWindows – sliding side, swing outWindshield – laminated glassWindshield wiper/washer – front and rearWrist rest/grab handle

ELECTRICALAlarm, backupAlternator, 75 amp – tractor engineAlternator, 35 amp – scraper engineBatteries (4), 12V maintenance free, high outputBatteries (2), 12V maintenance free, high outputElectrical system, 24VLighting System – Tractor

Directional signalsHazard lightsHeadlights, halogen with dimmerFloodlight, cutting edge

Lighting System – ScraperDirectional signalsHazard lightsStop/tail

Starting receptacle – tractor and scraper engines

22 657G Wheel Tractor Scraper specifications

Standard EquipmentStandard equipment may vary. Consult your Caterpillar dealer for details.

OTHER STANDARD EQUIPMENTTractor

Air dryerAuto ether aidCushion hitchExtended Life Coolant, –36° C (–33° F)Fast oil changeFendersGuard, bottomGuard, crankcaseHydraulic retarderLocks, vandalism protectionProduct Link ReadyTires, 40.5/75 R39 radialTow pins – front and rear

ScraperExtended Life Coolant, –36° C (–33° F)Engine coolant heaterFuel system, fast fill (meets EEC regulations)Fast oil changeFendersHydraulic retarderLocks, vandalism protectionOverflow guardTires, 40.5/75 R39 radial

POWER TRAINTractor

EngineCat C18, ACERT™ Technology

6-cylinder, turbocharged dieselMechanically-actuated Electronic Unit Injection (MEUI)Air cleaner, dry-type with pre-cleanerElectric start, 24VFan, suctionRadiator, NGMR (9 fins per inch)Ground level engine shutdownGuard, crankcaseMufflerStarting aid, ether

Braking systemParking/primary/secondary/hydraulic retarderShields – brake

Transmission8-speed automatic powershift with electronic controlControl throttle shiftingDifferential lock-upDownshift inhibitorNeutral coast inhibitorProgrammable top-gear selectionTransmission hold

ScraperEngine

Cat C15, ACERT Technology6-cylinder, turbocharged diesel

Mechanically-actuated Electronic Unit Injection (MEUI)Electric start from the cab, 24VFan, suctionRadiator, NGMR (9 fins per inch)Ground level engine shutdownMufflerStarting aid, etherThermo-shield, laminated

Braking systemParking/primary/secondary/hydraulic retarderShields – brake

Transmission8-speed automatic power shift with electronic control

23657G Wheel Tractor Scraper specifications

Optional EquipmentOptional equipment may vary. Consult your Caterpillar dealer for details.

Fan, defrosterLock, steeringPush-pull arrangement w/rear radiator guardRetractable seat beltsProduct Link

Auger Heater, engine coolantLights, side visionPush block, extendedPush-pull arrangementSteering, secondaryExtended Life Coolant, –50° C (–58° F)

R

For more complete information on Cat products, dealer services, and industry solutions, visit us on the web at www.cat.com

© 2008 CaterpillarAll Rights Reserved

Printed in U.S.A.

Materials and specifications are subject to change without notice.Featured machines in photos may include additional equipment.

See your Caterpillar dealer for available options.

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identity used herein, are trademarks of Caterpillar and may not be used without permission.

AEHQ5652-01 (12-08)

Replaces AEHQ5652

657G Wheel Tractor Scraper