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EngineTractor Engine Cat® C18 ACERT™
Net Power 345/373 kW 462/500 hpScraper Engine Cat C9 ACERT
Net Power 198/211 kW 266/283 hp
Scraper BowlHeaped Capacity 26 m3 34 yd3
Rated Load 37 285 kg 82,200 lb
631G/637GWheel TractorScrapers
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631G/637G Wheel Tractor Scrapers
Quick loading, high travel speeds and theability to load and dump on the run yieldfast cycle times, allowing Caterpillar® WheelTractor-Scrapers to consistently deliverhigh productivity.
Auger Arrangement
Provides self-loading capability withthe same wide material appetite asan open bowl machine. pg. 13
Push-Pull Arrangement (637G only)
For maximum production capability,Caterpillar offers an optional push-pullarrangement for the 637G, 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 C9 engines withACERT™ Technology work at thepoint of combustion to optimize engineperformance and minimize exhaustemissions. Matched with the torqueconverter and power shift transmission,they provide 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 high productivity.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
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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Cat C18 Tractor Engine. The tractor forthe 631G and 637G is powered by theC18 engine with ACERT™ Technology.The large displacement and high torquerise provides optimal performance inthe load, cut, haul and return. Matchedto the high efficiency torque converterand electronically controlled powershift transmission, it will provide yearsof dependable service.
Cat C9 Scraper Engine. The 637G hasa C9 engine with ACERT technologythat provides additional power to assistin loading as well as improve haulingperformance on grades.
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. Cat engines havedual horsepower capability with the lowpower setting in torque converter driveand the high power setting in directdrive. If the auger is engaged whilethe machine is in torque converter drive,the machine automatically goes to thehigh power 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 in thefield. The system combines the technicaladvancement of an electronic controlsystem with the simplicity of directmechanically controlled unit fuel injectionpressure. These features allow the C18to completely control injection timing,duration and pressure.
Electronic Control Module. The ECMresponds to operator commands andengine sensor input to optimize engineand machine performance. This advancedengine management software controls andprotects the engine at all times againstcold starts, high altitude operations andair filter plugging by 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
ADEM A4 Control Module. Controlsengine rpm by adjusting the fuel duration,which results in quicker starts in hotand cold weather, better fuel economy,better operator response, and automaticcompensation for altitude and filterplugging.
Reduced Exhaust Smoke. The ADEM A4controller monitors electronic sensorsto determine the optimum fuel/air ratio.Fuel is precisely controlled duringcranking, starting and acceleration toreduce smoke. The Engine Electronicsare faster and more efficient thanmechanically controlling the governorrack position.
Ether Starting Aid. The ADEM A4controller activates the ether injectionsystem during engine cranking toenhance cold weather starting.
Control Throttle Shifting (CTS).Automatically synchronizes engine speedto transmission speed during shiftingto reduce power train stress and increasecomponent life. In addition it resultsin a smoother ride for the operator.
Directional Shift Management.Regulates engine speed to preventdamage caused by high-speeddirectional changes.
Low Battery Elevated Idle. The ADEMA4 controller automatically compensatesfor low alternator output at low idle byraising the rpm for brief intervals tokeep the batteries fully 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.
Scraper Electrical Harness. A ribbonwiring harness replaced the cable harnessfor improved wear and durability. Itsgreater flexibility oscillates better withmachine movement, and polyurethaneboots offer better protection againstthe elements.
Automatic Belt Tensioning. Boththe tractor 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 drive bearingson both the tractor and scraper engineswith ACERT® technology eliminateservicing requirements.
One-Piece Power Block. The jumpstartreceptacle and disconnect switch areintegrated into one-piece power blockthat provides better electrical integrityand serviceability. The disconnect switchwith lockable cover locks out all powerfor 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 andthe scraper reduces clogging in severeapplications. Two-piece service doorsimprove access to clean out debris.
Scraper Radiator. The scraper has abrazed aluminum core scraper radiatorwith composite tanks featuring 9 finsper inch.
Extended Oil Change Interval. Oil changeintervals in both the C18 and C9 enginescan be extended to 500 hours with theuse of S•O•SSM analysis.
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Transmission. Electronically controlledCaterpillar planetary powershifttransmission with eight forward andone reverse speed. Tractor gears 1 and 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 larger contactarea between gears than countershafttransmissions for greater load-carryingcapacity.
Transmission Hold. Incorporated intothe joystick controller, TransmissionHold allows the operator to maintainconverter drive for increased rimpull,or hold the current gear for enhancedcontrol.
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 canbe used to slow the ground speed ofthe machine when entering the cut orfill area to allow the transmission todownshift. It also reduces service brakewear and enhances machine control.
Differential Control. Electronic differentiallock helps prevent the drive wheels fromspinning in poor underfoot conditions.The operator engages the differential lockwith a foot control located 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-rowroller bearings and Caterpillar Duo-Cone®
seals deliver exceptional reliability inthe toughest applications.
Independent Brake Systems. Expanding-shoe type brakes use a cam-operateddesign, which is air-applied and springreleased. The secondary braking systemuses independent front and rear circuitsthat are automatically applied if theservice air pressure drops to 380 kPa(55 psi). Audible and visual action alertindicators inform the operator when theservice air pressure drops to 518 kPa(75 psi).
Parking Brakes. The push-buttonoperated parking brake features a spring-applied, air-released mechanism thatoperates 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, reducingcomponent stress and providing a better ride.
Cushion Hitch. The electronicallyactuated cushion hitch incorporates aparallelogram-type linkage for exceptionalstrength. Twin nitrogen accumulatorshelp deliver a smooth ride for enhancedoperator 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.They absorb and dampen road shocks,thus reducing loads from beingtransmitted 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 has slopedcorners to maximize visibility whileaccommodating the low emissions engine.
The redesigned hood and front shroudare wider to enclose the air-to-airaftercooler (ATAAC), ether startingaid, and lights. The exhaust is locatedat the back of the hood for goodvisibility to the right side.
Instrument Display Panel. Features anew quad-gauge layout showing enginecoolant temp, transmission/torqueconverter oil temp, fuel level, and systemair pressure. The 637G tachometercan monitor either front or rear enginespeeds. Once the 637G 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 and reducesreaching.
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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, Driveand Reverse) and allows operator-definedtop gear control. Relocating the gearcontrol to the rear increases operatorlegroom.
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 thejoystick controller helps operators whenadjusting seat swivel, and gives thema place to rest their hand while onthe haul and return roads.
Single Lever Implement Control. Simpleand easy to operate, the joystick enhancesthe productivity of operators of all skilllevels. Requires less force to control thecritical scraper functions and requiresless lever travel.
1) Bowl (forward and 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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(Down)
1 (Up)
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.The ADEM A4 controller monitorsair filter restriction. If the restrictionexceeds the allowable limit, it alerts theoperator by sending a message to theElectronic Monitoring System (EMS III).
Automatic Ether Injection. The ADEMA4 controller activates the ether injectionsystem during engine cranking to enhancecold weather starting.
Automatic Altitude Compensation.At high altitudes the system automaticallyde-rates fuel delivery as a functionof barometric pressure sensed by thesystem’s atmospheric pressure sensor.
Low Battery Elevated Idle. The ADEMA4 controller automatically compensatesfor low alternator output at low idle byraising the rpm for brief intervals tokeep the batteries fully 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 monitor boththe tractor and scraper from one locationinstead of two. Both the tractor andpowered scraper use the same controllerfor parts commonality and easierservicing.
Easy Access Diagnostics. A variety ofdiagnostic codes are accessible throughthe EMS main display module, viathe 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 EUIsystem has fewer moving parts thanmechanical unit injection and requiresfew adjustments. The ADEM A4controller communicates with themonitoring system (EMS) to warnthe operator when problems arise,to help avoid major damage.
Maintenance. EUI engines havevirtually no mechanically controlledparts to wear or adjust. These have beenreplaced by electronic controls, reducingmaintenance costs and increasingmachine availability.
Product Link. Product Link is a wirelesssystem that allows the customer totrack 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 the engine,engine rpm and temperature.
Reduced Exhaust Smoke. The ADEM A4controller monitors electronic sensorsto determine the optimum fuel/air ratio.Fuel is precisely controlled duringcranking, starting and acceleration toreduce smoke. The Engine Electronicsare faster and more efficient thanmechanically controlling the governorrack position.
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Electronic ControlsIntegrated electronic controls provide smooth, consistent shifts through the synchronizationof engine and transmission speeds.
Redesigned Bowl. The redesigned bowlminimizes falling material lodgingbetween the bowl and the draft arm,which can result in premature wear.The modifications also provide betterload retention on level ground ortraversing down a grade. Bowl capacityhas been increased by 3 yd3 (2.3 m3),allowing more material to be moved.
• 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 carry back.A spill guard helps retain material andkeep it from spilling over onto the rearof the scraper (standard on tandemengine scrapers, optional on singleengine open bowl scrapers).
Cutting Edges. May be adjusted accordingto job conditions. The stinger (drop down)position provides good penetration andefficient flow of material into the bowl,whereas the level cutting edge is usedfor finish work or very high impactconditions.
Ground Engaging Tools. A wide varietyof Cat Ground Engaging Tools (GET)options such as standard, serrated, andabrasion resistant material (ARM), areavailable to optimize scraper loading invarious materials. For example, ARMscraper cutting edges and router bitswill provide up to five times the wearlife of 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 ensure thepower to handle steep grades, and makespossible all wheel drive to handle soft,slippery underfoot conditions.
Dual Horsepower. On the tandemengine scraper, the rear engine has dualhorsepower capability that results inbetter performance on the haul roads.
Material Application. Well suited tohandle a wide variety of material fromclay to shot rock.
Push-Loading. To achieve maximumproductivity, the 631G should be pushloaded by a D9R or D10R Track-TypeTractor. The larger tractor offer quickerloading times with denser loads than thesmaller tractor.
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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, typicallyloading both machines in less thana minute.
Flexible Fleet. This system providesa more balanced, flexible fleet usingfewer machines and less investmentthan comparable self-loading or push-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 the triggeris engaged to actuate the push-pull bailor auger.
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Push-Pull Arrangement (637G only)Caterpillar offers a self-loading arrangement for the 637G.
Typical push-pull operation using twin 627G machines.
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, conditionsit and carries it to the top of the load fortrue self-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 for precisemetering and better compactionin the fill
• reduces dust and noise duringloading
Dual Horsepower. Tractor engineautomatically reverts to the higher settingwhen 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.
Implement Valve Relocation.The implement valve has been relocatedfrom the tractor to the top of scraperdraft tube. The result is fewer hoses andtubes that cross over the gooseneck, andfewer potential leak points. The relocationalso improved access to the implementvalve for better serviceability.
Electro-hydraulic Controls. The 637Gfeatures full electro-hydraulic controls,which simplify serviceability and reducenoise by replacing the cab pilot valveswith a single-lever joystick control.The high efficiency oil filter providescleaner oil for the pilot system.
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.
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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,fuel filters and priming, coolant levelsight glass, window washer bottle,air conditioning 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, sothe hood easily swings open towards thefront of the machine. This allows betteraccess to those areas located on topof the 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. The CaterpillarElectronic Technician (Cat ET) ServiceTool is useful in troubleshooting existingproblems or identifying potentialproblems 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, viathe 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.
SAFETY.CAT.COM™.
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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. To save money usegenuine 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 dealerscan estimate component life, preventivemaintenance cost, and the true costof 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 owning andoperating 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 yourinvestment.
Operation. Improving operatingtechniques can boost your profits.Your Cat dealer has videotapes, literatureand other ideas to help you increaseproductivity, and Caterpillar offerscertified operator training classes tohelp 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 or replace?Your Cat dealer can help you evaluatethe cost involved so you can make theright choice.
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Customer SupportCat dealer services help you operate longer with lower costs.
16 631G/637G Wheel Tractor Scrapers specifications
Scraper Bowl
Heaped Capacity 26 m3 34 yd3
Rated Load 37 285 kg 82,200 lbStruck Capacity 18.3 m3 24 yd3
Depth of Cut – max. 437 mm 17.2 inWidth of Cut, to Router Bits 3512 mm 138.3 inGround Clearance – max. 545 mm 21.5 inCutting Edge – thickness 28 mm 1.12 in.Hyd. Penetration Force – 631G 255 kN 57,375 lbHyd. Penetration Force – 637G 360 kN 81,000 lbDepth of Spread – max. 480 mm 18.9 inApron Opening 2007 mm 79 inApron Closure Force 170 kN 38,250 lb
Hydraulics
Bowl Cylinder Bore 184 mm 7.2 inBowl Cylinder Stoke 873 mm 34.4 inApron Cylinder Bore 210 mm 8.2 inApron Cylinder Stroke 727 mm 28.6 inEjector Cylinder Bore 210 mm 8.2 inEjector Cylinder Stroke 1880 mm 74 inSteering Circuit 379 L/min 100 gal/minScraper Circuit 344 L/min 91 gal/minCushion Hitch Circuit 34.5 L/min 9 gal/minSecondary Steering Circuit 379 L/min 100 gal/minRelief Valve – Steering Circuit 13 700 kPa 1,987 psiRelief Valve – Implement Circuit 14 000 kPa 2,030 psiCompensator Setting – 16 000 kPa 2,320 psiCushion Hitch Circuit
Steering
Width – 180° Turn 12.2 m 40 ft 1 inSteering Angle – right 90°Steering Angle – left 85°
• Optional secondary steering system meets SAE J1511(OCT 90) and ISO 5010 (1992) requirements.
Engine
Tractor Engine Cat C18 ACERT™Scraper Engine Cat C9 ACERT
Tractor Engine
Net Power 345/373 kW 462/500 hpGross Power – Gears 1-2 364 kW 488 hpGross Power – Gears 3-8 392 kW 526 hpNet Power – Gears 1-2 345 kW 462 hpNet Power – Gears 3-8 373 kW 500 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.
• Net power ratings apply at 1,800 rpm when tested under thespecified standard conditions for ISO 9249 and EEC 80/1269.
Scraper Engine
Net Power 198/211 kW 266/283 hpGross Power – Gear 1 213 kW 286 hpGross Power – Gears 2-4 226 kW 303 hpNet Power – Gear 1 198 kW 266 hpNet Power – Gears 2-4 211 kW 283 hpBore 112 mm 4.4 inStroke 149 mm 5.9 inDisplacement 8.8 L 538 in3
• Net power advertised is the power available at rated speedof 2,000 rpm, measured at flywheel when the engine isequipped with fan, air cleaner, muffler and alternator.
• Net power ratings apply at 1,800 rpm when tested under thespecified standard conditions for ISO 9249 and EEC 80/1269.
17631G/637G Wheel Tractor Scrapers specifications
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
• The operator sound pressure level measured accordingto the procedures specified in ISO 6394:1998 is 85 dB(A) forthe cab offered by Caterpillar, when properly installed andmaintained and tested with the doors and windows closed.
• Standard air conditioning system contains environmentallyfriendly R134a refrigerant.
• Brakes meet ISO 3450: 1998
Service Refill Capacities – Tractor
Crankcase 45 L 11.9 galTransmission 110 L 29 galDifferential 148 L 39 galFinal Drive (per side) 23 L 6.1 galCooling System 110 L 29 galHydraulic Reservoir 190 L 50.2 galWheel Coolant (each) 75 L 19.8 galWindshield Washer 6 L 1.5 gal
Service Refill Capacities – Scraper
Fuel Tank – 631G 814 L 215 galFuel Tank – 637G 1268 L 335 galCrankcase 30 L 7.9 galTransmission 72 L 19 galDifferential 12 L 3.2 galFinal Drive (per side) 19 L 5 galWheel Coolant (each) 75 L 19.8 galCooling System 76 L 20 gal
18 631G/637G Wheel Tractor Scrapers specifications
DimensionsAll dimensions are approximate.
1 Width – overall machine 3938 mm 155 in2 Width – tractor 3481 mm 137 in3 Width – rear tire center 2464 mm 97 in
lines4 Width – inside of bowl 3405 mm 134 in5 Width – outside rear 3636 mm 143.2 in
tires6 Height – overall shipping 4286 mm 168.8 in7 Height – top of cab 3715 mm 146.3 in8 Ground Clearance, Tractor 665 mm 26.2 in9 Front of Tractor to Front 3359 mm 132.2 in
Axle
10 Axle to Vertical Hitch Pin 548 mm 21.6 in11 Height – scraper blade 545 mm 21.5 in
max.12 Wheelbase 8769 mm 345.2 in13 Length – overall machine 14 565 mm 573.4 in14 Rear Axle to Rear of Machine 2437 mm 96 in15 Bail Length – max. 4960 mm 195.3 in
(push-pull)16 Extended Push Block 2744 mm 108 in
(push-pull)
1 2 3 4 5
637G
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19631G/637G Wheel Tractor Scrapers specifications
Model 631G 637G 637GStandard Push-Pull
Shipping, with ROPS cab and 10% fuelFront axle 67% 59% 59%
30 393 kg 67,005 lb 30 177 kg 66,529 lb 31 071 kg 68,499 lb
Rear axle 33% 41% 41%
14 969 kg 33,001 lb 20 970 kg 46,231 lb 21 591 kg 47,601 lb
Total 100% 45 362 kg 100,006 lb 51 147 kg 112,760 lb 52 662 kg 116,100 lbOperating empty, with ROPS cab, full fuel tanks and operator
Front axle 67% 59% 59%
31 138 kg 68,648 lb 30 708 kg 67,700 lb 31 602 kg 69,670 lb
Rear axle 33% 41% 41%
15 337 kg 33,812 lb 21 339 kg 47,044 lb 21 960 kg 48,414 lb
Total 100% 46 475 kg 102,460 lb 52 047 kg 114,744 lb 53 562 kg 118,084 lbLoaded, based on a rated load of 37 285 kg (82,200 lb)
Front axle 53% 49% 49%
44 393 kg 97,870 lb 43 773 kg 96,503 lb 44 515 kg 98,139 lb
Rear axle 47% 51% 51%
39 367 kg 86,790 lb 45 559 kg 100,441 lb 46 332 kg 102,145 lb
Total 100% 83 760 kg 184,660 lb 89 332 kg 196,944 lb 90 874 kg 200,284 lb
Weights (approximate)
Transmission
Model 631G 637GForward 1 4.7 kph 2.9 mph 5.5 kph 3.4 mph
2 8.4 kph 5.2 mph 10.0 kph 6.2 mph
3 11.9 kph 7.4 mph 12.2 kph 7.6 mph
4 16.1 kph 10.0 mph 16.6 kph 10.3 mph
5 21.6 kph 13.4 mph 22.2 kph 13.8 mph
6 29.3 kph 18.2 mph 30.1 kph 18.7 mph
7 39.4 kph 24.5 mph 40.6 kph 25.2 mph
8 53.5 kph 33.2 mph 54.9 kph 34.1 mph
Reverse 9.9 kph 6.2 mph 9.9 kph 6.2 mph
20 631G/637G Wheel Tractor Scrapers specifications
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.
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.
631G Gross Weight37.25R35 Tires
Speed
Tota
l Res
ista
nce
(Gra
de p
lus
Rolli
ng R
esis
tanc
e)
Rim
pull
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 46 475 kg (102,460 lb)L—Loaded 83 760 kg (184,660 lb)
631G RetardingGross Weight
Speed
Effe
ctiv
e G
rade
(Gra
de m
inus
Rol
ling
Resi
stan
ce)
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 46 475 kg (102,460 lb)L—Loaded 83 760 kg (184,660 lb)
75 100 125 150 175 lb x 1000
km/h0 5 10 15 20 25 30 35 40 45 50 55 60
mph0 5 10 15 20 25 30 35
E L3
4
5
6
78
30 kg x 100040 50 60 70 80
30%
22%
16%
10%
5%
1%
0 5 10 15 20 25 30 35 40 45 50 55
30 40 50 60 80 100 120 160 200 lb x 1000
655545
35
2520
15
108
6
4
2
1 2
5
10
15
20
30
4050
70
100120150
lb x1000
kg x1000
0 5 10 15 20 25 30 35 mph
km/h
30%25%20%
15%12%10%8%
6%5%4%
3%
2%
605040302015 70 90 kg x 1000
E L
1
2
3
45
67
8
21631G/637G Wheel Tractor Scrapers 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.
637G Gross Weight37.25R35 Tires
Speed
Tota
l Res
ista
nce
(Gra
de p
lus
Rolli
ng R
esis
tanc
e)
Rim
pull
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 52 047 kg (114,745 lb)L—Loaded 89 332 kg (196,944 lb)
637G RetardingGross Weight
Speed
Effe
ctiv
e G
rade
(Gra
de m
inus
Rol
ling
Resi
stan
ce)
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 52 047 kg (114,745 lb)L—Loaded 89 332 kg (196,944 lb)
50 100 150 200 250 300 lb x 1000
km/h0 5 10 15 20 25 30 35 40 45 50 55 60
mph0 5 10 15 20 25 30 35
E L
3 4
56
78
35 kg x 100055 75 95 115 135
30%
25%
20%
15%
10%
1%
5%
0 5 10 15 20 25 30 35 40 45 50 55
30 40 50 60 80 100 120 160 200 lb x 1000
655545
35
2520
15
108
6
4
2
1 2
5
10
20
50
100
150
lb x1000
kg x1000
0 5 10 15 20 25 30 35 mph
km/h
30%25%20%
15%12%10%8%
6%5%4%
3%
2%
605040302015 70 90 kg x 1000
15
30
40
70
120 1
2
3
45
6
7
8
E L
22 631G/637G Wheel Tractor Scrapers specifications
Standard EquipmentStandard equipment may vary. Consult your Caterpillar dealer for details.
POWER TRAINEngine
Electric start, 24VFan, suction (steel spider with nylon blades)Ground level engine shutdownMufflerStarting Aid, etherThermo-shield, exhaust manifold and turbo soft wrappedTractor:
Cat C18 with ACERT™ Technology6 cylinder diesel, Mechanical Electronic Unit
Injection (MEUI)Air Cleaner, dry-type with pre-cleanerGuard, crankcaseRadiator, NGMR (9 fins per inch)
Scraper (637G):Cat C9 with ACERT Technology
6 cylinder diesel, Mechanical Electronic UnitInjection (MEUI)
Radiator, brazed aluminum core, composite tanks(9 fins per inch)
Braking SystemParking/Primary/SecondaryShields – brake
TransmissionTractor:
8-speed automatic Powershift with Electronic ControlControl throttle shiftingDifferential – lockupDownshift InhibitorNeutral coast inhibitorProgrammable top-gear selection
Scraper (637G):4-speed automatic Powershift with Electronic Control
OTHER STANDARD EQUIPMENTExtended Life Coolant, –36° C (–33° F)Fan hub, permanent lubeFast Oil ChangeFendersRims – 35 inch (2)Tires, 37.50-R35 radialTractor:
Air dryerCushion hitchLocks, vandalism (oil fill, dipstick)Product Link readyTow Pins – front and rear
Scraper:Air inlet heaterFuel System – (637G, fast fill European Union Compliant)
ELECTRICALAlarm, backupAlternator, 75 amp – tractor engineAlternator, 35 amp – scraper engine (637G)Batteries (4), 12V Maintenance Free, High OutputBatteries (2), 12V Maintenance Free, High Output (637G)Electrical System, 24VLighting System – Tractor
Directional Signals; Hazard Lights; Headlights, halogenwith dimmer; Floodlight, Cutting edge
Lighting System – ScraperDirectional Signals; Hazard Lights; Stop/Tail
Starting Receptacle – tractor and scraper engines
OPERATOR ENVIRONMENTAir Conditioner (includes heater and defroster)Cigarette Lighter and AshtrayCoat HookDiagnostic Connection Port (12V)Dome Courtesy LightGauge Group
Air PressureConverter/Retarder temperatureElectronic Monitoring System (EMS III)Engine coolant temperatureActual Transmission Gear IndicatorFuelSpeedometerTachometerTransmission gear indicator
HornImplement Control JoystickRearview MirrorsRadio Ready (two radio openings, speakers,
and 5-amp converter)ROPS Cab with Sound Suppression and PressurizationStatic SeatbeltScraper Engine Controls (637G)Seat, Air Suspension, Caterpillar Comfort, clothSteering Wheel – tilt and telescopingStorage CompartmentThrottle LockTransmission HoldWindows – sliding side, swing outWindshield – laminated glassWindshield Wiper/Washer – front and rear
23631G/637G Wheel Tractor Scrapers specifications
Optional EquipmentOptional equipment may vary. Consult your Caterpillar dealer for details.
Lock, SteeringOverflow Scraper Guard (631G)Power train GuardPush Block – extended (637G scraper)Push-Pull Arrangement w/Rear Radiator Guard (637G)Retractable seat beltsSecondary Steering
Auger Crankcase Guard, Heavy DutyExtended Life Coolant, –50° C (–58° F)Fan, DefrostFenders (631G scraper) Fuel system – (631G, fast-fill European Union Compliant)Heater – jacket water (all engines)Hydraulic RetarderLights, Side Vision
