Specalog for 621G/627G Wheel Tractor Scrapers, … Engine Cat C9 with ACERT technology ... high displacement and low RPM ratings. C9 Scraper Engine. The 627G is tandem powered by the

®®

EngineTractor Engine Cat® C15 with ACERT® technology

Net Power 246/272 kW 330/365 hpScraper Engine Cat C9 with ACERT technology

Net Power 178/198 kW 239/266 hpHeaped Capacity 17 m3 22 yd3

Rated Load 23 950 kg 52,800 lb

621G/627GWheel TractorScrapers

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621G/627G Wheel Tractor ScrapersResponsible, 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 WheelTractor-Scrapers to consistently deliver highproductivity at the lowest cost per ton.

Auger Arrangement

Provides self-loading capability withthe same wide material appetite asan open bowl machine. pg. 13

Push-Pull Arrangement (627G only)

For maximum production capability,Caterpillar offers an optional push-pullarrangement for the 627G, whichallows two push-pull scrapers to actas a self-loading machine. pg. 12

Electronic Controls

Electronic controls improve machineresponse and provide advanced diagnosticcapabilities that result in better machineavailability. The Product Link optionallows remote monitoring of location,machine system status, and alertindicators. pg. 7

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Power Train – Transmission

Planetary powershift transmissiondelivers excellent load capability.Redesigned front and rear axlesaccommodate wider brake shoes anddrums. The neutral coast inhibitor andprogrammable top gear reduce wearwhile increasing machine performance.pg. 6

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Power Train – Engine

Electronically controlled Caterpillar®

engines with ACERT technology,modular radiator with 9 fins per inch,and an Electronic Control Modulemaximizes power to the cutting edgeand exceptional haul road speed. pg. 4

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✔ New Feature

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Customer Support

The best parts availability and the bestservice capability will help keep yourequipment working. pg. 15

Serviceability

The latest electronic monitoringsystems, grouped service points, andrugged Caterpillar components simplifymaintenance and minimize downtime.New two-piece access doors open easilyand stay open for better access. pg. 14

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Scraper Bowl

Caterpillar Scraper bowls deliver largeloads with better retention, excellentmaterial flow, fast cycle times and highproductivity. Relocating the implementvalve to the draft tube improves accessand serviceability. pg. 11

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Structures

Superior structural design deliversstate-of-the-art ride, capacity, andmaterial control while assuring thedurability and reliability customersexpect from Caterpillar. pg. 10

Operator Station

Convenient control placement and acomfortable work environment are keysto high productivity. Features includeSingle Lever Implement Control, anair seat suspension and improvedinstrumentation. pg. 8

C15 Tractor Engine. The Cat C15Electronically Controlled Unit Injection(EUI) diesel engine powers the tractor.With dual horsepower capability,it provides high power and torque risefor excellent lugging in tough loadingconditions. The C15 is designed forlong hours of continuous operation withhigh displacement and low RPM ratings.

C9 Scraper Engine. The 627G is tandempowered by the Cat C9 scraper enginefor peak performance and highproductivity in self-loading applications.The C9 has a smaller physical envelopethan the Cat 3306 it replaced, weighsless, and delivers more horsepower.In addition, all daily inspection pointsare located on the right hand side foreasier maintenance.

Dual Horsepower . Electronic enginesdeliver increased power when the augeris engaged or when the machine is inthe roading gears, providing quickeracceleration on the haul road.

ACERT Technology. The C15 and theC9 electronic engines with ACERTtechnology meet US EPA Tier 3 andEU Stage III emission regulations.ACERT technology reduces emissionsduring the 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.

Electronic Control Module (ECM).The ECM responds to operatorcommands and engine sensor inputto optimize engine and machineperformance. This advanced enginemanagement 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

ADEM™. The ADEM controls enginespeed by adjusting the fuel duration,resulting in quicker starts in hot andcold weather, better fuel economy,better operator response, and automaticcompensation for altitude and filterplugging.

Air-to-Air Aftercooling (ATAAC).Reduces air inlet temperature forenhanced combustion efficiency,reduced emissions levels, higheraltitude capability, and more power.

Greater Reliability. The EUI systemhas fewer moving parts than mechanicalunit injection and requires fewadjustments. ECM communicates withthe monitoring system (EMS) to warnthe operator of potential problems,preventing major damage from occurring.

Maintenance. EUI engines havevirtually no mechanically controlledparts to wear or adjust. These havebeen replaced by electronic controls,reducing maintenance costs andincreasing machine availability.

Control Throttle Shifting (CTS).Automatically synchronizes enginespeed to transmission speed whenshifting gears. CTS reduces power trainstress and increases component life, aswell as providing a smoother ride forthe operator.

Automatic Ether Injection. ECMactivates the ether injection systemduring engine cranking to help ensurereliable engine start-up in extreme coldoperating conditions.

Directional Shift Management.During directional shifts or shiftsfrom neutral during high engine speed,engages speed clutches before directionalclutches to reduce power train energyand increase power train life.

Automatic Altitude Compensation.The ECM automatically matchesfuel delivery to barometric pressure.Auto deration protects against excessivecombustion temperatures that couldresult in component damage.

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The new ACERT technology and proven components are electronically integrated to achievenew levels of performance and efficiency.

Power Train – Engine

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

Fuel Economy. Electronic controls yielda fuel savings by optimizing the timingsetting for varying conditions. The ECMmatches timing to the load on the engine,engine speed and temperature.

Air Filter Restriction. The ECM monitorsair filter restriction and sends a warningmessage to the Electronic MonitoringSystem III to alert the operator if therestriction exceeds the allowable limit.

Reduced Exhaust Smoke. The ECMreads electronic sensors to determinethe optimum fuel/air ratio, then preciselycontrols fuel during cranking, startingand acceleration to reduce smoke.The ECM system is faster and moreefficient than mechanically controllingthe governor rack position.

Low Battery Elevated Idle. ECMautomatically compensates for lowalternator output at low idle by raisingthe rpm for brief intervals to keep thebatteries fully charged.

Electronic Unit Injection (EUI).Electronic injection provides completecontrol over injection timing, duration,rate and pressure under changingconditions over the entire engineoperating range. The EUI controlledengine delivers:

• improved fuel efficiency

• more power

• decreased smoke and emissions

• faster hot and cold starts

• better high altitude performance

• less noise than mechanicalinjector engines

Engine Speed Lock. Allows the operatorto maintain a given engine speedwithout using the accelerator pedal.This eliminates operator fatigueassociated with holding the pedal downfor extended periods of time. An on/offrocker switch enables the Speed Lockfeature, and a lamp indicates the featureis active. Moving the rocker switch tothe off position, or activating the servicebrakes or the retarder, disables the feature.

NGMR Engine Cooling System.The standard radiator for the tractor isthe Next Generation Modular Radiator(NGMR) that features 9 fins per inch,whereas the previous model had astandard radiator of 33 fins per inch.The increased radiator fin spacingreduces clogging in severe applications.

Scraper Radiator. The scraper has astandard unit core radiator, a one-pieceunit design with 9 fins per inch. The largerfin spacing reduces clogging andeliminates the need for an attachmentradiator.

Automatic Belt Tensioning. Both thetractor and scraper engines now haveautomatic belt tensioning rather thanmanual tensioning. Other improvementsfor both the tractor and scraper enginesinclude:

• reducing the number of belts(from five to two on the tractor,from four to two on the scraper)

• eliminating the servicing for fandrive bearings

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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 indirect-drive for drive train efficiencyduring the haul. Reverse gear operatesin converter drive. All scraper gearsoperate in converter drive for increasedtorque capability during the cut and fill.

Planetary Design. Provides largercontact area between gears thancountershaft transmissions forgreater load-carrying capacity.

Neutral Coast Inhibitor. Neutral coastinhibitor prevents the transmissionfrom shifting into neutral if the operatorselects neutral while moving, as wellas maintaining the flow of thetransmission fluid.

Transmission Hold. Allows the operatorto maintain converter drive for increasedrimpull, or hold the current gear forenhanced control.

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

Retarder. The hydraulic retarder acts asan internal brake on the driveline thatminimizes the need to apply servicebrakes. By engaging the retarder 3 to4 seconds before the machine traversesa downhill grade, the operator can reducewear on the service brakes and enhancemachine control.

Differential Control. Electronic differentiallock on the tractor helps prevent thedrive wheels from spinning in poorunderfoot conditions. The operatorengages the differential lock by choosingeither the right or left foot controllocated on the floor of the cab.

Brake Performance. Redesigned axleson both the tractor and scraperaccommodate wider brake shoesand brake drums, improving brakeperformance as much as 20 percent andreducing brake and drum wear as muchas 75 percent.

Independent Systems. Expanding-shoetype brakes are a cam-operated designthat is air-applied and spring released.The braking system uses independentfront and rear circuits, with the secondarybrakes automatically applied if theservice air pressure drops to 55 psi(380 kPa).

Parking Brakes. The push-button operatedparking brake features a spring-applied,air-released mechanism that operatesthe service brakes. Meet the ISO 3450:1998 standard.

Final Drives. Outboard-mounted, planetarydesign final drives reduce torque loadson other power train components.Large-capacity, double-row rollerbearings and Caterpillar Duo-Coneseals deliver exceptional reliabilityin the toughest applications.

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Power Train – TransmissionIntegrated electronics allows the machine to monitor the power train which reduces stress aswell as provide a better ride to the operator.

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.Electronic control module (ECM)monitors air filter restriction and sendsa warning message to the electronicmonitoring system (EMS) to alert theoperator if the restriction exceeds theallowable limit.

Automatic Ether Injection. The ECMactivates the ether injection systemduring engine cranking to enhance coldweather 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. ECMautomatically compensates for lowalternator output at low idle by raisingthe rpm for brief intervals to keep thebatteries fully charged.

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

Combined EMS Monitoring. TheElectronic Monitoring System(EMS III) on the 627G is designed tomonitor both the tractor and scraperstatus and access fault codes from onelocation instead of two. Both the tractorand powered scraper use the samecontroller for parts commonalityand easier servicing.

Easy Access Diagnostics. Diagnosticcodes are accessible through the EMSmain display module, via the ElectronicTechnician (Cat ET). This offers a headstart on problem solving, with a radiocall often providing the service technicianwith the knowledge of which tools,troubleshooting guides, and possiblyeven replacement parts to bring tothe machine.

Greater Reliability. The Caterpillar EUIsystem has fewer moving parts thanmechanical unit injection and requiresfew adjustments. ECM communicateswith the monitoring system (EMS) towarn the operator when problems arise,preventing major damage from occurring.

Maintenance. EUI engines havevirtually no mechanically controlledparts to wear or adjust. These havebeen replaced by electronic controls,reducing maintenance costs andincreasing machine availability.

Fuel Economy. Electronic controls yielda fuel savings by optimizing the timingsetting for varying conditions. The ECMmatches timing to the load on the engine,engine speed and temperature.

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 has thecapability to automatically issue alertswhen the machine is being operatedbeyond owner defined time andlocation limits.

Reduced Exhaust Smoke. The ECMreads electronic sensors to determinethe optimum fuel/air ratio, then preciselycontrols fuel during cranking, startingand acceleration to reduce smoke.The ECM system is faster and moreefficient than mechanically controllingthe governor rack position.

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Electronic ControlsInstant response optimizes machine performance, and advanced diagnostic capabilitiesmaximize machine availability.

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

• Swivels and locks in four positions(0°, 10°, 20° and 30°) providingthe optimum operating positionin the cut or on the haul.

• Fore/aft and vertical heightadjustment to accommodatevarious sized operators.

Seat Suspension. The seat suspensionredefines the ride of scrapers. It featuresa high performance air shock absorberwith its own air compressor.

Revised Steering Column. Increaseslegroom a full 3.5 inches (89 mm),and reduces knee contact points.

Standard Air Conditioning. Gives theoperator a comfortable workstation inany kind of weather. Relocated ventilationlouvers improve airflow to the operator.

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.

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Redesigned for enhanced operator comfort and productivity.

Operator Station

Visibility. Hood and front shroudwidth increased to accommodate thelow emission engine, the air-to-airaftercooler (ATAAC), ether starting aid,and lights. Hood corners are sloped tomaintain the same level of visibility asthe E-Series.

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. Grab handle/hand rest next to joystick controller sooperator has a place to rest hand whileon the haul and return roads.

1) Bowl (forward & back)

2) Ejector (side to side)

3) Thumb rocker switch

• Apron position

• Elevator direction, speed

4) Transmission Hold

5) Cushion Hitch

6) Trigger* (not shown here –is on front of joystick)

• Auger (on/off)

• Push-Pull (bail up/down)

• Elevator (on/off, resume)

* Standard open bowl does not havea trigger

Instrument Display Panel. Features aquad-gauge layout showing enginecoolant temp, transmission/torqueconverter oil temp, fuel level, andsystem air pressure. The 627G tachometercan monitor either front or rear enginespeeds. Once the 627G tractor enginehas been started, the operator can startthe rear engine from inside the cab.EMS III can display both front and rearengine information right in the cab.

Logical Control Placement. Frequentlyused switches and indicator lights areon the instrument panel, and lessfrequently used switches on theoverhead console.

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

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.

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14

5

3

(Down)

1 (Up)

2 (Forward) 2 (Return)

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

• 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 preventingthese loads from being transmitted tothe 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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2

3

4

8

4

8

5

6

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Redesigned Bowl. Excellent productivitywith a 10% increase in bowl capacity,improved draft arm protection, andbetter load retention. Low-profile designof the bowl offers less resistance toincoming materials, while cellularconstruction adds strength and dentresistance to bowl sides and floor.

Bulldozer Ejection System.Combines constant spreading controlwhile minimizing carryback material.A spill guard on the ejector (standard on627G, optional on 621G) helps retainmaterial and keep it from spilling overonto the rear of the scraper.

Cutting Edges. May be adjusted accordingto job conditions. For most efficientloading, use the thinnest edge thatprovides satisfactory wear life andimpact resistance.

Caterpillar Ground Engaging Tools(GET). A wide variety of Ground EngagingTool (GET) options, such as standard,serrated, and abrasion resistant material(ARM), are available to optimizescraper loading in various materials.Most are reversible to provide long lifeand reduced operating costs. Contact yourCat Dealer to learn more about the besttools for your applications.

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

Dual Horsepower. Provides increasedhorsepower during the haul whichresults in faster cycle times.

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

Push-Loading. To achieve maximumproductivity, the 621G should bepush loaded by a D8R or D9RTrack-Type Tractor.

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Scraper BowlDesigned for optimum loading, material retention and ejection.

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

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.

Increased Production. As the leadmachine enters the cut, the trailingmachine lowers the bail on the hook ofthe first machine. The second machinethen pushes the first machine until it isloaded. When the second machine beginsits loading cycle, the first machine pullsthe second machine until it is loaded.After both machines are loaded, thesecond machine raises its bail anddisengages from the first machine.

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

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Push-Pull Arrangement (627G only)Caterpillar offers a self-loading arrangement for the 627G.

Versatility. The auger has a widematerial appetite ranging from rockto free flowing material such as sand.The auger lifts material off of thecutting edge, conditions it, andspreads it evenly in the bowl fortrue self-loading capability.

Material Conditioning. As the augercarries material from the cutting edgeto the top of the load, it conditions thematerial into uniform size which helpseliminate voids in the bowl, thus ensuringconsistent payloads. Conditionedmaterial also requires less compactiveforce in the fill. In applications wheredust is a concern, the auger hasdemonstrated that it significantlyminimizes dust while loading whencompared to the elevator loading system.

Auger Benefits. The auger actions onthe material produce several benefits:

• wide material appetite, idealfor landfills

• blending material creates aconsistent, well-mixed load

• conditioned material reduces voidsin the bowl for larger, moreconsistent payloads, and promotescompaction in the fill

• reduces dust and noise during loading

• precise metering of materialin the fill

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

Slip Limiter Switch (627G). Preventsrear wheel slip during loading.

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

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

Electronic Monitoring System (EMS III).Monitors machine status and providesreal-time information to the operatorincluding warnings of problems identifiedby the Electronic Control Modules.

Event Log. The EMS event log recordsproblems detected by the controlsystem, including the time an eventoccurs, the number of occurrencesfor the event, an event identifier andproblem code. The event log can beaccessed using the ElectronicTechnician (ET).

Implement Valve Relocation.The implement valve has been relocatedfrom the tractor to the top of scraperdraft tube, reducing the number of hosesand tubes that cross over the gooseneck.The move reduces potential leak points,and improves service access.

One Piece Power Block. Jumpstartreceptacle and disconnect switch areintegrated into a one-piece powerblock for better electrical integrity andserviceability. The disconnect switch,with a lockable cover, disables allpower from the batteries and jumpstartfunctions.

Electro-Hydraulic Implement Control.Simplifies serviceability by removingthe cab pilot valve and associated lines,which also improves reliability andreduces noise. The high efficiencyelectro-hydraulic pilot oil filter providescleaner oil for the pilot system.

Scraper Electrical Harness. A ribbonwiring harness replaced the cable harnessfor improved wear and durability.Its increased flexibility oscillates with themachine, and polyurethane boots offerbetter protection against the elements.

Access Doors. The tractor has astandard two-piece door on the rightside for better access to service points.The hood, hinged on the front andsupported by spring struts, easily openstowards the front of the machine, forbetter access to the top of the engine.

Electronic Technician (Cat ET).The Caterpillar Electronic Technician(Cat ET) Service Tool is useful introubleshooting existing problemsor identifying potential problems bydisplaying:

• Real-time pressures, temperatures,fuel settings and diagnosticmessages

• 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. Diagnosticcodes are accessible through the EMSmain display module, via the Cat ET.Relaying this information to the servicetechnician can let him know whichtools, troubleshooting guides, andpossibly even replacement parts tobring to the 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. Save money withgenuine Cat Reman parts. You receivethe same warranty and reliability as newproducts at substantial 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 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 thecustomer’s investment.

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 orreplace? Your Cat dealer can helpyou evaluate the cost involved soyou can make the right choice.

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

16 621G/627G Wheel Tractor Scrapers specifications

Transmission

1 Forward 5 kph 3.1 mph2 Forward 7.6 kph 4.7 mph3 Forward 10.9 kph 6.8 mph4 Forward 14.8 kph 9.2 mph5 Forward 19.9 kph 12.4 mph6 Forward 26.9 kph 16.7 mph7 Forward 36.4 kph 22.6 mph8 Forward 51.5 kph 32 mphReverse 9.2 kph 5.7 mph

Hydraulics

Bowl Cylinder Bore 152 mm 6 inBowl Cylinder Stoke 813 mm 32 inApron Cylinder Bore 184 mm 7.25 inApron Cylinder Stroke 597 mm 23.5 inEjector Cylinder Bore 165 mm 6.5 inEjector Cylinder Stroke 1549 mm 61 inSteering Circuit 209 L/min 55 gal/minScraper Circuit 284 L/min 65.5 gal/minCushion Hitch Circuit 37 L/min 9.8 gal/minSupplemental Steering Circuit 150 L/min 39.9 gal/minRelief Valve – Steering Circuit 15 500 kPa 2,250 psiRelief Valve – Implement Circuit 15 000 kPa 2,175 psi

• Flow rates measured at 1900 rpm

• Supplemental steering measured at 24 km/h (14.9 mph)

Steering

Steering Angle – Right 90°Width – 180° Turn 10.9 m 35.9 ftSteering Angle – Left 85°Hydraulic Output 209 L/min 55 gal/min

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

• Steering circuit at 1900 RPM

Engine

Tractor Engine Cat C15 ACERTScraper Engine Cat C9 ACERT

Tractor Engine

Net Power – Gears 1-2 246 kW 330 hpNet Power – Gears 3-8 272 kW 365 hpGross Power – Gears 1-2 268 kW 359 hpGross Power – Gears 3-8 294 kW 394 hpBore 140 mm 5.5 inStroke 165 mm 6.5 inDisplacement 15.2 L 928 in3

• Net power advertised is the power available at rated speedof 1800 rpm, measured at the flywheel when the engine isequipped with fan, air cleaner, muffler and alternator.

Scraper Engine

Net Power – Gear 1 178 kW 239 hpNet Power – Gears 2-4 198 kW 266 hpGross Power – Gear 1 192 kW 258 hpGross Power – Gears 2-4 213 kW 286 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 2200 rpm, measured at the flywheel when the engine isequipped with fan, air cleaner, muffler and alternator.

Scraper Bowl

Heaped Capacity 17 m3 22 yd3

Rated Load 23 950 kg 52,800 lbStruck Capacity 12 m3 15.7 yd3

Depth of Cut – Max. 333 mm 13.1 inWidth of Cut, to Router Bits 3023 mm 119 inGround Clearance – Max. 522 mm 20.6 inCutting Edge – Thickness 22 mm 0.88 inHyd. Penetration Force – 621G 150.4 kN 33,840 lbHyd. Penetration Force – 627G 215 kN 48,375 lbDepth of Spread – Max. 522 mm 20.6 inApron Opening 1780 mm 70 inApron Closure Force 107 kN 24,075 lb

17621G/627G Wheel Tractor Scrapers specifications

Standards

• Rollover Protective Structure (ROPS) meets SAE J320a,SAE J1040 MAY 94, ISO 3471-1986 and ISO 3471-1994

• Falling Object Protective Structure (FOPS) meets SAE J231JAN 81 and ISO 3449-1992

• The operator sound exposure Leq (equivalent soundpressure level) measured according to the work cycleprocedures specified in ANSI/SAE J1166 OCT98 is 81 dB(A),for cab offered by Caterpillar, when properly installed andmaintained and tested with the doors and windows closed.

• Hearing protection may be needed when operating withan open operator station and cab (when not properlymaintained or doors/windows open) for extended periodsor in noisy environments.

• Standard air conditioning system contains environmentallyfriendly R134a refrigerant.

Service Refill Capacities – Tractor

Crankcase 36 L 9.5 galTransmission 72 L 19 galDifferential 144 L 38 galFinal Drive (per side) 19 L 5 galCooling System 107 L 28 galHydraulic Reservoir 140 L 37 galWheel Coolant (each) 45 L 12 galWindshield Washer 6 L 1.5 gal

Service Refill Capacities – Scraper

Fuel Tank – 621G 606 L 160 galFuel Tank – 627G 1105 L 292 galCrankcase 30 L 7 galTransmission 59 L 15.6 galDifferential 15 L 4 galFinal Drive (per side) 19 L 5 galCooling System 77 L 20.3 galWheel Coolant (each) 45 L 12 gal


DimensionsAll dimensions are approximate.

1 Width – Overall Machine 3467 mm 136.5 in2 Width – Tractor 3130 mm 123.2 in3 Width – Rear Tire Center Lines 2180 mm 85.8 in4 Width – Inside of Bowl 2946 mm 116 in5 Width – Outside Rear Tires 3048 mm 120 in6 Height – Overall Shipping 3705 mm 145.9 in7 Height – Top of Cab 3423 mm 134.8 in8 Ground Clearance, Tractor 553 mm 21.8 in9 Front of Tractor to Front Axle 3058 mm 120.4 in

10 Rim Radius 432 mm 17 in11 Height – Scraper Blade Max. 522 mm 20.6 in12 Wheelbase 7722 mm 304 in13 Length – Overall Machine 12 917 mm 508.5 in14 Rear Axle to Rear of Machine 2142 mm 84.3 in15 Bail Length – Max. 1612 mm 63.5 in

(push-pull)16 Extended Push Block 2786 mm 109.7 in

(push-pull)

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8 11

15 9 12 14

1316

673 4 51 2

627G

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8

10

11

9 12

13

7621

621G

53 4


Model 621G 627G 627GStandard Push-Pull

Shipping, with ROPS cab and 10% fuelTractor 69% 59% 61%

22 677 kg 49,994 lb 21 975 kg 48,447 lb 23 650 kg 52,139 lb

Scraper 31% 41% 39%

10 118 kg 22,461 lb 15 271 kg 33,666 lb 15 120 kg 33,335 lb

Total 100% 32 865 kg 72,455 lb 37 246 kg 82,113 lb 38 770 kg 85,473 lb

Operating empty, with ROPS cab, full fuel tanks and operatorFront axle 68% 59% 60%

22 760 kg 50,176 lb 22 330 kg 49,230 lb 23 623 kg 52,080 lb

Rear axle 32% 41% 40%

10 710 kg 23,612 lb 15 518 kg 34,211 lb 15 749 kg 34,720 lb


Loaded, based on a rated load of: 23 950 kg 52,800 lb 23 950 kg 52,800 lb 23 950 kg 52,800 lb

Front axle 53% 48% 49%

30 433 kg 67,092 lb 29 663 kg 65,396 lb 31 028 kg 68,405 lb

Rear axle 47% 52% 51%

26 987 kg 59,497 lb 32 135 kg 70,845 lb 32 294 kg 71,197 lb


Weights (approximate)


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.

0 10 20 30 40 50 60

10

0

20

30

40

0

0

20 40 60 80 100 140120

km/h

mph

kg x 1000

lb x 1000lb x1000

kg x1000

0 5 10 15 20 25 30 35

0

20

40

60

80

10 20 40 50 60 7030

5%

30%

25%

20%

15%

10%

8th Gear

3rd Gear

2nd Gear

1st Gear

5th Gear4th Gear

6th Gear7th Gear

Direct Drive

Torque Converter Drive

E L

621G Tier 3 — RimpullStandard Arrangement*

Gross Weight

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 Direct 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

* at sea level

E—Empty 32 865 kg (72,455 lb)

L—Loaded 57 420 kg (126,589 lb)

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h

mph

kg x 1000

lb x 1000

25%

30%

5%

10%

15%

20%

0 10 20 30 40 50 60 70 80

0 20 40 60 80 100 120 140 160 180

0 5 10 15 20 25 30 35 40

E L

8th Gear

3rd Gear

5th Gear

4th Gear

6th Gear

7th Gear

621G Tier 3 — Retarding*Gross 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

* at sea level

E—Empty 32 865 kg (72,455 lb)

L—Loaded 57 420 kg (126,589 lb)


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

10

0

20

50

40

30

60

0

0

20 40 60 80 100 140120

km/h

mph

kg x 1000

lb x 1000lb x1000

kg x1000

0 5 10 15 20 25 30 35

0

20

40

60

80

100

120

10 20 40 50 60 7030

5%

30%

25%

20%15%

10%8th Gear

3rd Gear

2nd Gear

1st Gear

5th Gear4th Gear

6th Gear7th Gear

Direct Drive

Torque Converter Drive

E L

627G Tier 3 — RimpullStandard Arrangement*

Gross Weight

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 Direct 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

* at sea level

E—Empty 38 770 kg (85,473 lb)

L—Loaded 63 332 kg (139,601 lb)

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h

mph

kg x 1000

lb x 1000

25%

30%

5%

10%

15%

20%

0 10 20 30 40 50 60 70 80

0 20 40 60 80 100 120 140 160 180

0 5 10 15 20 25 30 35 40

E L

8th Gear

3rd Gear

5th Gear

4th Gear

6th Gear

7th Gear

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.

627G Tier 3 — Retarding*Gross 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

* at sea level

E—Empty 38 770 kg (85,473 lb)

L—Loaded 63 332 kg (139,601 lb)


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

POWER TRAINEngine

Electronic Unit Injection (EUI)Electric Start, 24VFan, SuctionGround Level Engine ShutdownMufflerStarting Aid, EtherThermo-shield, LaminatedTractor:

Cat C15, 6-cylinder Diesel with ACERT TechnologyAir Cleaner, Dry-type with Pre-cleanerRadiator, NGMR (9 fins per inch)Guard, Crankcase

Scraper (627G):Cat C9, 6-cylinder Diesel with ACERT TechnologyUnit Core Radiator (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 (627G):4-speed Automatic Power Shift with Electronic Control

OTHER STANDARD EQUIPMENTExtended Life Coolant, –36°C (–33°F)Fast Oil ChangeFendersRims – 29 in (736.6 mm)Tires, 33.25-R29 radialTractor:

Air DryerCushion HitchLocks, Vandalism ProtectionProduct Link ReadyTow Pins – Front and Rear

ELECTRICALAlarm, backupAlternator, 75 amp – Tractor EngineAlternator, 35 amp – Scraper Engine (627G)Batteries (4), 12V Maintenance Free, High OutputBatteries (2), 12V Maintenance Free, High Output (627G)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 bays, speakers, 5-amp converter)ROPS Cab with Sound Suppression and PressurizationStatic SeatbeltScraper Engine Controls (627G)Seat, Air Suspension, Caterpillar Comfort, ClothSteering Wheel – Tilt and TelescopingStorage CompartmentEngine Speed Control LockTransmission HoldWindows – Sliding Side, SwingoutWindshield – Laminated GlassWindshield Wiper/Washer – Front and Rear


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

kg lb627G

Auger 4536 10,000Fuel System, Fast-fill 10 23Heater, Engine Coolant 2 4Lights, Side Vision 5 10Push Block, Extended (scraper) 200 440Push-pull Arrangement (scraper) 489 1078Push-pull Arrangement (scraper)

w/o Rear Engine Radiator Guard 349 770Retarder, Hydraulic (tractor) 150 330Retarder, Hydraulic (scraper) 154 340Steering, Secondary 50 110

kg lb621G

Auger 4536 10,000Fenders, Scraper 121 266Fuel System, Fast-fill 10 23Heater, Engine Coolant 2 4Lights, Side Vision 5 10Retarder, Hydraulic 150 330Steering, Secondary 50 110

R

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

© 2007 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.

CAT, CATERPILLAR, ACERT, SAFETY.CAT.COM, their respective logos, “Caterpillar Yellow”and the POWER EDGE trade dress, as well as corporate and product identity used

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

AEHQ5612-01 (10-07)

Replaces AEHQ5612 (11-04)

621G/627G Wheel Tractor Scrapers

Documents

Specalog for 621G/627G Wheel Tractor Scrapers, … Engine Cat C9 with ACERT technology ... high displacement and low RPM ratings. C9 Scraper Engine. The 627G is tandem powered by the