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D8T Track-Type Tractor Engine Weights Engine Model Cat ® C15 ACERT™ Operating Weight 39 795 kg 87,733 lb Global Emissions U.S. Tier 4 Interim/EU Stage IIIB Shipping Weight 30 490 kg 67,219 lb Gross Power – SAE J1995 259 kW 348 hp Gross Power – ISO 14396 237 kW 318 hp Gross Power – ISO 14396 (DIN) 322 hp Net Power – SAE J1349 231 kW 310 hp Net Power – ISO 9249 231 kW 310 hp Net Power – ISO 9249 (DIN) 314 hp

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D8TTrack-Type Tractor

Engine WeightsEngine Model Cat® C15 ACERT™ Operating Weight 39 795 kg 87,733 lbGlobal Emissions U.S. Tier 4 Interim/EU Stage IIIB Shipping Weight 30 490 kg 67,219 lbGross Power – SAE J1995 259 kW 348 hpGross Power – ISO 14396 237 kW 318 hpGross Power – ISO 14396 (DIN) 322 hpNet Power – SAE J1349 231 kW 310 hpNet Power – ISO 9249 231 kW 310 hpNet Power – ISO 9249 (DIN) 314 hp

D8T Features

Powerful ProductivityStandard electro-hydraulic controls improveprecision and response. Dedicated hydraulics andmachine control systems aid overall productivity.Features like Enhanced Auto Shift and a HydraulicDemand Fan help reduce overall fuel use andoperating costs.

Operator StationEase of operation, cab comfort and layout helpkeep operators focused and more productive.

Engine and Emissions TechnologyCat® engine and aftertreatment solutionsmeet U.S. EPA Tier 4 Interim and EU Stage IIIBemissions standards.

Integrated Electronic SolutionsCaterpillar offers a variety of technologies,like optional Cat Grade Control, to signi� cantlyenhance machine performance. Cat Product Linkhelps � eet managers maximize utilization andcontrol costs.

Serviceability and Customer SupportEase of serviceability, Cat dealer support expertiseand machine rebuild capability help reduce overallowning and operating costs.

ContentsOperator Station..................................................3

Engine ...................................................................3

Emissions Technology........................................4

Powertrain............................................................5

Implement and Steering Controls ....................6

Work Tools............................................................7

Integrated Technologies....................................8

Cooling System..................................................10

Undercarriage ...................................................10

Structures...........................................................11

Sustainability .....................................................11

Serviceability and Customer Support............12

Speci�cations....................................................13

Standard Equipment .........................................16

Optional Equipment...........................................17

Notes...................................................................18

The Cat® D8T has a long history of best-in-class versatility,productivity and resale value. Because it excels acrossa wide range of dozing tasks, customers choose the D8Tfor everything from dozing, ripping, scraper work and landclearing to rough �nish grading. And with features designedfor even greater comfort, productivity and fuel ef�ciency,today’s D8T does even more to help you meet your businessobjectives. The D8T meets U.S. Tier 4 Interim/EU Stage IIIBemission standards.

Operator StationComfort and convenience

The D8T cab is designed and equipped for operator productivity,safety and comfort. Large single-pane windows, tapered hoodand notched fuel tank provide excellent visibility to all sidesof the machine and around the job site. New standard andoptional light packages extend the productive work day.

The D8T features an updated in-dash display with newfunctionalities. An improved Advisor Monitoring System tracksmachine operating conditions in real time. An integrated gradecontrol system display mount puts job site data convenientlyin front of the operator.

Operators will enjoy comfort features like standard air-ridesuspension seat, adjustable arm rests and well-positioned airvents. The cab is radio ready and includes a personal musicplayer jack. A power converter supplies supplemental powerfor cellular phones and computers. New �nishes make thecab easier to clean.

EnginePower and reliabilityThe D8T features a Cat® C15 ACERT™ engine and aCat Clean Emissions Module to deliver the performanceand ef�ciency that customers demand, while meetingU.S. EPA Tier 4 Interim/EU Stage IIIB emissions standards.

The six-cylinder electronic engine is turbocharged andaftercooled. The displacement produces better luggingcapability, lower internal stresses and longer component life.

ACERT Technology is a combination of buildingblocks that includes electronics, fuel systems, airmanagement systems and aftertreatment components.The system is optimized based on engine size, the typeof application and the geographic location in which itwill work. The technologies are applied systematicallyand strategically to meet high customer expectations forproductivity, fuel ef�ciency, reliability and service life.

3

Emissions TechnologyReliable, integrated solutions

Cat NOx Reduction SystemThe Cat NOx Reduction System captures and cools a smallquantity of exhaust gas, then routes it into the combustionchamber where it drives down combustion temperaturesand reduces NOx emissions.

Aftertreatment TechnologiesTo meet Tier 4 Interim/Stage IIIB emissions standards andbeyond, Cat aftertreatment components have been designedto match application needs. System components include aDiesel Oxidation Catalyst (DOC), which uses a chemicalprocess to convert regulated emissions in the exhaust system,and a Diesel Particulate Filter (DPF) that traps particulatematter that is carried into the exhaust stream.

The DOC, DPF and Cat Regeneration System are containedin a Caterpillar designed Clean Emissions Module (CEM) thatprotects the components, minimizes the aftertreatment footprintand simpli�es maintenance. For high debris applications thatrequire thermal shields on exhaust components, an optionalinsulated CEM is available for the D8T (available mid 2011).

Cat Regeneration SystemThe Cat Regeneration System is designed to worktransparently, without any interaction needed from theoperator. Under most operating conditions, engine exhaust ishot enough to oxidize soot through passive regeneration. Ifsupplemental regeneration is needed, the Cat RegenerationSystem elevates exhaust gas temperatures to burn off sootin the Diesel Particulate Filter (DPF). This is a process thathappens automatically, but the operator can initiate the cyclewhen convenient or interrupt regeneration as needed. A sootlevel monitor and regeneration indicator lights are integratedinto the D8T dash display.

Key Off Regeneration – Optional Key Off Regenerationallows the operator to initiate a regeneration cycle after thekey has been turned off. If a cycle takes place, the engine willcomplete regeneration, followed by a cool down period priorto shutting down.

Delayed Engine Shutdown – Delayed Engine Shutdown featureis available to allow the machine to cool immediately after aheavy work load or regeneration cycle.

Engine Idle Shutdown Timer – An optional Engine Idle Shutdowntimer will sound a warning and shut down the engine after themachine has been idling for a pre-set period of time.

4

PowertrainPowerful ef�ciency

From engine to transmission to �nal drives, the D8T powertrain is designed to turn power into productive work. The D8Toffers unmatched lugging capability and smooth shifting when changing gears under varying loads. The 3-speed forward,3-speed reverse transmission, backed by differential steering, offers excellent run out speeds and accurate steering capability.

Torque DividerA robust, high ef�ciency torque divider provides high torque multiplication to move heavy loads, while shielding the drive trainfrom sudden torque shocks and vibration.

Differential Steering SystemDifferential steering maintains full power to both tracks for best-in-class turning under load. When one track speeds up, theother slows down an equal amount. Maneuverability – especially with large blade loads – is improved, as well as cycle timesin some applications. Greater load capacity, power and speed control are possible in soft underfoot conditions on steep slopesbecause both tracks are powered during turns.

Planetary Power Shift TransmissionThe planetary power shift transmission offers smooth shifting and quick speed and directional changes for maximum productivity.The transmission is built for long life, and a modular design allows for ease of service without removing other components.

Enhanced Auto ShiftThe new Enhanced Auto Shift feature uses the simple “shift up, idle back” principle during forward and reverse travel to savefuel and improve overall dozing cycle fuel ef�ciency.

Auto-Shift/Auto-KickdownAuto-shift allows the operator, by just making a directional change, to go from preset forward to preset reverse gears.Auto-kickdown automatically downshifts the transmission when signi�cant load increases are detected. These features areespecially useful when back�lling or rough grading. Operators can select from a variety of settings, and can override theautomatic shift features at any time.

5

Implement and Steering ControlsErgonomically designed for ease of operation

Steering and Transmission ControlA new steering tiller is ergonomically designed to improve operator comfort. The new thumb roller on the steering control shiftsthe electronically controlled powershift transmission. The tiller allows precise steering in close areas with the �nest modulationin the industry.

Dozer Control LeverThe D8T features an ergonomically designed dozer lever with low effort, electro-hydraulic controls for added operator comfort,ease of operation and precise work tool control. Features such as blade response, blade �oat, auto blade pitch and spread ratecan be set up and adjusted using the Advisor panel. When equipped, single-handle convenience also controls functions likeAccuGrade, Auto Blade Assist, AutoCarry™, Cat Grade Control and Dual Tilt.

Electronic Ripper ControlA rigidly mounted handgrip provides �rm support for the operator even when ripping in the roughest terrain. Thumb and�ngertip controls direct ripper functions. Programmable features like Auto Lift, Shank-Out, Auto Stow and Automatic RipperControl help increase operator ef�ciency.

Throttle Rocker SwitchOne touch of the throttle rocker switch automatically adjusts engine speed to high or low idle. A new feature allows theoperator to press and hold until desired engine speed is reached, then release for the machine to maintain the new chosen speed.

6

Work ToolsEquipped for versatility

BulldozersBlades are made of high tensile strength steel with a strongbox-section design to stand up to the most severe applications.Heavy moldboard construction and hardened bolt-on cuttingedges and end bits add strength and durability. Optional rockguards and de�ector shields help protect cylinders. High-CapacityUniversal, Semi-Universal and Angle Blades are available, aswell as special con�gurations for coal and woodchip stockpileapplications.

Optional Dual TiltDual Tilt improves load control and allows the operatorto optimize the blade pitch angle for better balance andproductivity. The operator can tilt the blade forward duringeach pass for better penetration, then tilt it back to increasecarrying capacity.

RippersThe standard D8T implement valve incorporates thecomponents necessary to install a ripper, helping to improveversatility and resale value. A Single-Shank Ripper is the bestchoice in severe applications. The shank is mounted close tothe rear idler for excellent penetration force. A Multi-ShankRipper is used in less severe applications or if ripping neara high wall. This con�guration offers the �exibility of usingone, two or three shanks.

HydraulicsField-proven load-sensing hydraulics respond to operatingrequirements by automatically and continually adjustingattachment hydraulic power for maximum ef�ciency.The variable displacement of the high ef�ciency pumpssupplies maximum �ow rates for tough applications,implement power on operator demand, and consistentpressure output for quick response. The variable �owdesign minimizes hydraulic oil temperatures and saves fuel.

Rear CounterweightsRear counterweights provide proper tractor balance tomaximize dozing production and are recommended whentractor is not equipped with any other rear attachment.

WinchesPlease consult your Cat dealer for available winch options.

7

Integrated TechnologiesSolutions to make work easier and more ef�cient

Caterpillar is the only manufacturer to offer wholly-integratedelectronic solutions that enable greater accuracy, higherproductivity, lower operating costs and more pro�tability.

Grade Control ReadyGrade Control Ready (GCR) is standard, with deeplyintegrated harnesses incorporated into the machine duringassembly. This integration allows for easy installation of theAccuGrade Ready Option (ARO) and AccuGrade machinecontrol and guidance system as business needs demand,or for improved resale value. The machine dashboard alsoincludes space to install an AccuGrade display.

AccuGrade Ready OptionThe D8T can be ordered from the factory with optionalbrackets and hardware installed, making the tractor readyto plug in the dealer installed AccuGrade machine controland guidance system. The factory installed ARO simpli�esthe dealer installation of the AccuGrade components andintegration into the machine helps protect components toenhance system robustness.

Cat AccuGradeAccuGrade is a dealer installed machine control andguidance system which enables operators to cut and �llto grade with increased accuracy, minimizing the need fortraditional stakes and grade checkers. AccuGrade usesadvanced Laser, Global Navigation Satellite System (GNSS)and/or Universal Tracking Station (UTS) technology,machine-mounted components and off-board hardware.This state-of-the-art machine control system providesprecise elevation information on an in-cab display to achieveaccurate blade positioning. By displaying real-time cut/�ll information in the cab, operators can improve theiref�ciency and get to grade faster with fewer passes than everbefore. The AccuGrade System signi�cantly improves theproductivity and accuracy of grading equipment – by asmuch as 50 percent over conventional methods.

Computer Aided Earthmoving System (CAES)Optional technology gives direction on cut and �ll withoutsurvey stakes. Graphical design plan shows machine’shorizontal and vertical position to simplify operation andenhance production. Combines cab-mounted GNSS technologyfor grade and slope control and has proven impact on workquality and overall productivity. Ideal applications includeleach pads, dump areas and reclamation sites. Helps operatorsconsistently and con�dently work to speci�cation the �rst time,eliminating costly re-work and aiding equipment utilization.

8

Cat Product LinkRemote monitoring with Product Link improves overall �eetmanagement effectiveness. Product Link is deeply integratedinto machine systems. Events and diagnostic codes, as wellas hours, fuel, idle time and other detailed information aretransmitted to a secure web based application, VisionLink™.VisionLink includes powerful tools to convey information tousers and dealers, including mapping, working and idle time,fuel level and more.

Cat Grade Control (Available mid-2011)Cat Grade Control is an option that integrates traditionalmachine control and guidance with machine hardware andsoftware to help improve productivity, usability, reliabilityand value.

Factory integrated harnesses and sensors allow for real-timeblade tip positioning and offer protection from harsh workingenvironments. Cat Grade Control is a chassis mounted systemthat moves the traditional blade edge positioning technologyto the top of the cab. This �rst-of-its-kind design helps reducereceiver damage, enhances visibility for the operator andeliminates a receiver/antennae, masts and cables. The chassismounted design also allows for accurate “track mapping,”enabling the machine to map job site progress withoutadditional personnel on the ground.

Cat Grade Control software is enhanced to automaticallyguide the blade to the desired design contours. Integrated withAutoCarry, it also senses and controls the load of the bladefor improved performance and ef�ciency in high productiondozing applications.

AutoCarry™ – Automates blade lift control to maintain adesired blade load, improve job consistency and to reduceoperator fatigue. Works seamlessly with Cat Grade Controland Auto Blade Assist. This new generation in integratedmachine control and guidance makes the track-type tractornot only a grading machine, but a high productivity solution.

Automatic Ripper Control – Assists the operator by automaticallycontrolling ripper depth based on track slip. This helpsoperators be more productive, as well as reduces wearand tear on the machine.

Auto Blade Assist – Automates blade pitch and lift controlduring a typical dozing cycle to help reduce operator fatigue.Functionality varies depending on the components andsoftware installed on the machine and can be operated inconjunction with AutoCarry.

Grade Protection – Operating mode that prevents blade tipsfrom going below the site design plan. Grade Protectionoverrides/blocks manual commands when necessary to limitblade travel, offering operators added con�dence.

9

CoolingSystemDurable and ef�cient

The engine radiator, Air ToAir After Cooler (ATAAC) andhydraulic oil cooler are packagedin a single plane. Aluminum barplate construction aids durabilityand allows for higher heat transferand superior corrosion resistance.The standard cores feature 6 �nsper inch to allow debris to passthrough and reduce pluggingconcerns.

In cooler conditions, a HydraulicallyDriven Demand Fan reduces speedto conserve power, save fuel, anddecrease sound levels.

An optional Reversing Fan canbe set to change air �ow direction,ef�ciently removing debris from thecooling cores without the operatorleaving the cab. To improve coreserviceability, the cooling packagealso includes air wand or brushaccess slots. The ROPS mountedair conditioning system workswith the reversing fan for optimumfan purging and ambient coolingcapability.

UndercarriageEngineered for performance

The D8T features the Cat elevated sprocket design that isolates �nal drives,axles, and steering components from harsh impacts. The modular design aidsserviceability to help reduce maintenance costs. A variety of undercarriagecon�gurations and track shoe designs help optimize performance andundercarriage life.

Heavy Duty Undercarriage with Positive Pin Retention Moderate Service Sealedand Lubricated Track (SALT) is standard. This undercarriage is well suited toaggressive applications like land clearing, side-slopes, or working in rocky oruneven terrain. Components are designed for extended wear life in abrasiveconditions and high impact applications.

SystemOne™ Undercarriage is available as an option and can help reduce totalundercarriage owning and operating costs in many applications. SystemOne featureslifetime sealed and lubricated cartridges to eliminate bushing turns, and sprocketsrequire no replacement during the life of the chain. All SystemOne undercarriagecomponents are designed to work and wear as a system for longer track life.

StructuresEngineered for maximum production and service life

SustainabilityThinking generations aheadBene�ts of the Cat D8T include the following:

• Meets Tier 4 Interim/Stage IIIB emissions standards.

• Features like Enhanced Auto Shift and a HydraulicDemand Fan help decrease overall fuel consumption.

• Technologies like AccuGrade, Cat Grade Controland Product Link help improve overall ef�ciency,saving fuel and �uids, as well as wear and tearon equipment.

• New grab handles, steps, lighting packages and aground level service center help enhance job site safety.

• Major components are built to be rebuilt, eliminatingwaste and saving customers money by giving themachine and/or major components a second –and even third – life.

The D8T mainframe is built industry-leading tough– heavy steel castings, full box section frame rails andcontinuous rolled sections on top and bottom frame railsprovide the strength to absorb high impact shock loadsand twisting forces.

The D8T pivot shaft runs through the mainframeand connects to the roller frames, allowing independentoscillation. The full-length pivot shaft distributes impactloads throughout the case, reducing the bending stress onthe case. The Tag-Link brings the blade closer to the machinefor more precise dozing and load control. The designprovides solid lateral stability and better cylinder positionsfor constant break out force, independent of blade height.

Cat track-type tractor frames set the industry standard fordurability. Major structures and components are built tobe rebuilt, reducing waste and replacement costs.

12

Serviceability and Customer SupportWhen uptime counts

Ease of ServiceabilityThe D8T offers full left-side engine serviceability, including �lltube, dipstick, air cleaner, fuel �lters, oil �lter and coolant levelcheck. Cooling system access is also improved for inspectionand cleaning. To reduce maintenance cost and time, the D8Tfeatures a new high capacity �lter element and improvedpowertrain �lter bypass strategy to extend service intervals.The in-cab monitoring system also provides electronic �uidlevel veri�cation at startup for the coolant, powertrainand engine oil systems.

Ground Level Service CenterThe new ground level service center is accessible on the lefthand fender without setting foot on the machine, giving easyaccess to the battery disconnect, secondary engine shutdownand access light switches. A digital hour meter is also available.

Access/EgressNewly designed steps and handrails make climbing on and offthe tractor easier than ever. An access light switch turns on thecab or exterior light for night time visibility when mounting/dismounting the machine.

An Operator Presence Detection system allows the machine toidle when an operator is not in the seat. The system locks outthe powertrain so any unintentional movements during ingressor egress will not physically move the machine.

Renowned Cat Dealer SupportFrom helping you choose the right machine to knowledgeableongoing support, Cat dealers provide the best in sales andservice. Manage costs with preventive maintenance programslike Custom Track Service, Scheduled Oil Sampling (S·O·SSM)analysis, and guaranteed maintenance contracts. Stay productivewith best-in-class parts availability. Cat dealers can even helpyou with operator training to help you boost your pro�ts.

And when it’s time for machine replacement, your Cat dealercan help you save even more with Genuine Cat Reman parts.Receive the same warranty and reliability as new products atcost savings of 40 to 70 percent for powertrain and hydrauliccomponents.

D8T Speci�cations

Engine Weights Hydraulic Controls

Engine Model Cat® C15 ACERT™

Global Emissions U.S. Tier 4 Interim/EU Stage IIIB

Gross Power –SAE J1995

259 kW 348 hp

Gross Power –ISO 14396

237 kW 318 hp

Gross Power –ISO 14396 (DIN)

322 hp

Net Power – 231 kW 310 hpSAE J1349

Net Power – 231 kW 310 hpUndercarriage Bulldozer Relief

Valve Setting

ISO 9249 Shoe Type Moderate Service

Net Power – 314 hp Width of Shoe 610 mm 24 in Valve Setting

ISO 9249 (DIN) Shoes/Side 44Net Power – 231 kW 310 hp Grouser Height 78 mm 3 in Valve Setting

EU 80/1269 Pitch 216 mm 8.5 inBore 137 mm 5.4 in Ground Clearance 618 mm 24.3 in

Valve Setting

Stroke 172 mm 6.75 in

Displacement 15.2 L 928 in3Track Gauge 2082 mm 82 in

Length of Track 3207 mm 10.5 ft

Steering

• Engine ratings apply at 1,850 rpm. on Ground• Net power advertised is the power available

at the �ywheel when the engine is equippedGround ContactArea

3.58 m2 5,554 in2(4,351 psi).

with fan, air cleaner, muf�er, and alternator.• No derating required up to 3566 m Track Rollers/Side 8

(11,700 ft) altitude, beyond 3566 m Number of 1 per side (optional)(11,700 ft) automatic derating occurs. Carrier Rollers

four valves.• Positive Pin Retention Track.

Service Re�ll Capacities

Fuel Tank 643 L 170 gaI

Cooling System 77 L 20.3 gal TransmissionEngine Crankcase* 38 L 10 gal

Powertrain 155 L 41 gal 1 Forward

Final Drives (each) 12.5 L 3.3 gal 2 Forward

Roller Frames (each) 65 L 17.2 gal 3 Forward

Pivot Shaft 40 L 10.6 gal 1 Reverse

Compartment 2 Reverse

Hydraulic Tank 75 L 19.8 gal 3 Reverse

* With oil �lters. 1 Forward –

Operating Weight 39 795 kg 87,733 lb

Shipping Weight 30 490 kg 67,219 lb

• Operating Weight: Includes hydrauliccontrols, blade tilt cylinder, coolant,lubricants, 100% fuel, ROPS, FOPS cab,SU-Blade, Single-Shank Ripper, 610 mm(24 in) MS shoes, and operator.

• Shipping Weight: Includes coolant,lubricants, 20% fuel, ROPS, FOPS cab,and 610 mm (24 in) MS shoes.

Pump Type Piston-type, VariableDisplacement

Pump Output 276 L/min 73 gal/min(Steering)

Pump Output 226 L/min 60 gal/min(Implement)

Tilt Cylinder Rod 130 L/min 34 gal/minEnd Flow

Tilt Cylinder Head 170 L/min 45 gal/minEnd Flow

24 000 kPa 3,480 psi

Tilt Cylinder Relief 24 000 kPa 3,480 psi

Ripper (Lift) Relief 24 000 kPa 3,480 psi

Ripper (Pitch) Relief 24 000 kPa 3,480 psi

39 200 kPa 5,700 psi

• Steering Pump output measured at2,300 rpm (pump speed) and 30 000 kPa

• Implement Pump output measured at1,850 rpm and 6895 kPa (1,000 psi).

• Electro-hydraulic pilot valve assistsoperations of ripper and dozer controls.A standard hydraulic system includes

• Complete system consists of pump, tankwith �lter, oil cooler, valves, lines, linkageand control levers.

3.4 kph 2.1 mph

6.1 kph 3.8 mph

10.6 kph 6.6 mph

4.5 kph 2.8 mph

8 kph 5 mph

14.2 kph 8.8 mph

618.5 N 139 lbfDrawbar Pull (1000)

2 Forward – 338.2 N 76 lbfDrawbar Pull (1000)

3 Forward – 186.9 N 42 lbfDrawbar Pull (1000)

13

D8T Speci�cations

Blades Rippers Winches

Type 8SU Type Single-Shank, Winch Model PA14OVS

Capacity (SAE J1265) 8.7 m3

Width (over end bits) 3940 mm

Height 1690 mm

Digging Depth 575 mm

Ground Clearance 1225 mm

Maximum Tilt 883 mm

11.4 yd3

12.9 ft

5.5 ft

22.6 in

48.2 in

34.8 in

Number of Pockets

Maximum ClearanceRaised (under tip,pinned in bottom hole)

Maximum Penetration

AdjustableParallelogram

1

636 mm 25 in

1130 mm 44.4 in

Weight*

Oil Capacity

Increased TractorLength

Winch Length

Winch Case Width

1790 kg

15 L

563 mm

1430 mm

1160 mm

3,947 lb

4 gal

22.2 in

56.3 in

45.6 in

Weight* (without 4789 kg 10,557 lb (standard tip) Drum Width 320 mm 12.6 in

hydraulic controls) Maximum Penetration 127.3 kN 28,620 lb Flange Diameter 457 mm 18 in

Total Operating 39 795 kg 87,733 lb Force (shank vertical) Recommended 29 mm 1.13 inWeight** (withBlade and Single-Shank Ripper)

Type 8U

Capacity (SAE J1265) 11.7 m3 15.3 yd3

Pry out Force

Weight (withouthydraulic controls)

Total OperatingWeight* (with SU-

222.7 kN

4085 kg

39 795 kg

50,070 lb

9,005 lb

87,733 lb

Cable Size

Optional Cable Size

Drum Capacity– RecommendedCable Size

32 mm

84 m

1.25 in

276 ft

Width (over end bits) 4267 mm 14 ft Blade and Ripper) Drum Capacity 59 m 193 ft

Height 1740 mm 5.71 ft Type Multi-Shank, – Optional Cable

Digging Depth

Ground Clearance

575 mm

1225 mm

22.6 in

48.2 in

AdjustableParallelogram

Cable Ferrule Sizes– Outside Diameter

60 mm 2.36 in

Maximum Tilt

Weight* (withouthydraulic controls)

Total OperatingWeight** (withBlade and Single-Shank Ripper)

954 mm

5352 kg

40 358 kg

37.5 in

11,800 lb

88,974 lb

Number of Pockets

Overall Beam Width

Maximum ClearanceRaised (under tip,pinned in bottom hole)

Maximum Penetration(standard tip)

3

2464 mm

593 mm

780 mm

97 in

23.35 in

30.7 in

Cable Ferrule Sizes– Length

70 mm 2.76 in

• Variable speed, hydraulically driven, dualbraking system, three roller fairlead.

* Weight: Includes pump and operatorcontrols.

Type 8A

Capacity (SAE J1265) 4.7 m3

Width (over end bits) 4990 mm

Height 1174 mm

6.1 yd3

16.3 ft

3.85 ft

Maximum PenetrationForce (shank vertical)

Pry out Force(Multi-Shank Ripperwith one tooth)

124.2 kN

227.9 kN

27,920 lb

51,230 lb

Digging Depth 628 mm 24.7 in Weight (one shank, 4877 kg 10,752 lbGround Clearance 1308 mm 51.5 in without hydraulic

Maximum Tilt 729 mm 28.7 in controls)

Weight* (withouthydraulic controls)

5459 kg 12,035 lb

Total OperatingWeight** (withBlade and Single-Shank Ripper)

40 465 kg 89,210 lb

*Includes blade tilt cylinder.**Operating Weight: Includes hydraulic

controls, blade tilt cylinder, coolant,lubricants, 100% fuel, ROPS, FOPS cab,blade, single-shank ripper, 610 mm (24 in)MS shoes, and operator.

Additional Shank 332 kg 732 lb

Total Operating 40 587 kg 89,479 lbWeight* (with SU-Blade and Ripper)

*Total Operating Weight: Includes hydrauliccontrols, blade tilt cylinder, coolant,lubricants, 100% fuel, ROPS, FOPS cab,blade, single-shank ripper, 610 mm (24 in)MS shoes, and operator.

14

DimensionsAll dimensions are approximate.

6 5

1 7

2 8

3, 4 9, 10, 11

12, 13, 14

15, 16

17

1 Ground Clearance 618 mm 24.3 in

2 Track Gauge 2.08 m 6.8 ft

3 Width without (Standard Shoe) Trunnions 2693 mm 8.8 ft

4 Width Over Trunnions 3057 mm 10 ft

5 Height (Top of Stack) 3518 mm 11.5 ft

6 Height 3586 mm 11.8 ft

7 Drawbar Height (Center of Clevis) 708 mm 27.9 in

8 Length of Track on Ground 3207 mm 10.5 ft

9 Overall Length Basic Tractor 4641 mm 15.2 ft

10 Length Basic Tractor with Drawbar 4998 mm 16.4 ft

11 Length Basic Tractor with Winch 5275 mm 17.3 ft

12 Length with SU-Blade 6091 mm 20 ft

13 Length with U-Blade 6434 mm 21.1 ft

14 Length with A-Blade 6278 mm 20.6 ft

15 Length with Single-Shank Ripper (Lowered) 6422 mm 21 ft

16 Length with Multi-Shank Ripper (Lowered) 6344 mm 20.8 ft

17 Overall Length (SU-Blade/SS Ripper, Lowered) 7872 mm 25.8 ft

15

D8T Standard Equipment

Standard equipment may vary. Consult your Cat dealer for details.

POWERTRAINC15 ACERT diesel engine with

Electronic Unit Injection (EUI)EPA/ARB Tier 4 Interim and

EU Stage IIIB Certi�ed Enginewith aftertreatment

24-volt electric startHigh performance single plane

cooling systemAftercooler, air-to-air (ATAAC)Air �lter, with electronic

service indicatorCoolant, extended lifeFan, suction, hydraulically drivenFuel priming pump, electricSound attenuated exhaust systemParking brake, electronicPrecleaner, strata-tube dust ejectorPrescreenerShift management

– Automatic directional and downshift– Controlled-throttle, load-compensated– Enhanced Autoshift

Starting aid, automatic etherTorque dividerTransmission, electronically-controlled

– Powershift, 3F/3R speedFour planet, double-reduction

– Planetary �nal drivesTransmission control module, electronicTurbochargerWater separator

UNDERCARRIAGERollers and idlers, lifetime lubricatedSprocket rim segments, replaceableSuspension-type undercarriage8-roller tubular track roller frame

(Carrier roller ready)Track adjusters, hydraulicTrack guide610 mm (24 in) PPR moderate service

grouser with sealed and lubricatedtrack (44 section)

Two-piece master links

HYDRAULICSHydraulics, independent steering and

work tool pumpsHydraulics, electronically controlled,

load-sensing dozer lift and tiltElectronically enabled quick drop valve

STARTERS, BATTERIES,AND ALTERNATORS

Alternator, 150 ampBatteries, heavy dutyStarting receptacle, auxiliary

ELECTRICALAlarm, back-upConverter, 24V to 12VDiagnostic connectorHorn, forward warning

OPERATOR ENVIRONMENTArmrest, adjustableAdvisor operator interface

– Electronic monitoring system– Diagnostic service information– Operator preferences

Cab, ROPS/FOPS, sound suppressedDeactivation switch, hydraulic controlsAccess/egress lighting with

shutdown timerDecelerator pedalGovernor switch, electronicHeater and ventilationMirror, rearviewRadio-readyProvision for wire passage in/out of cabInterior LED courtesy lightsSeat, cloth, air-suspensionSeatbelt, retractableSteering control, direction and

speed control thumb switcheswith recall button

Wipers, intermittent

OTHER STANDARD EQUIPMENTCD ROM Parts BookEcology drainsEngine enclosuresEqualizer bar, pinnedFront pull deviceGuards, bottom hingedGrade control readyHVAC box – corrosive resistantMounting, lift cylindersOil cooler, hydraulicProduct LinkS·O·SSM sampling portsSteering, electronically controlled

power differentialVandalism protection for �uid

compartmentsEngine compartment service light

16

D8T Optional Equipment

Optional equipment may vary. Consult your Cat dealer for details.

POWERTRAINFan, auto reversingOil change system, powertrainPrecleaner, turbineFast fuel systemService packageDrains, ecology, powertrainEngine hour meterFan, auto reversingPrecleaner, turbine

UNDERCARRIAGETrack pairs (44-section) sealed and

lubricated, single grouser shoes

POSITIVE PIN RETENTION TRACKExtreme Service Track –

610 mm, 660 mm, 710 mm, 965 mm(24 in, 26 in, 28 in, 38 in)

Moderate Service Track –660 mm, 710 mm, 965 mm(26 in, 28 in, 38 in)

Super Extreme Service Track –610 mm (24 in)

Extreme Service Track (trapezoidal hole) –610 mm, 660 mm, 710 mm, 965 mm(24 in, 26 in, 28 in, 38 in)

Super Extreme Service Track(trapezoidal hole) – 660 mm (26 in)

Moderate Service Track(trapezoidal hole) – 710 mm (28 in)

SYSTEMONE TRACKExtreme Service –

610 mm, 660 mm, 710 mm(24 in, 26 in, 28 in)

Super Extreme Service –610 mm, 660 mm, 710 mm(24 in, 26 in, 28 in)

Extreme Service (center hole) –610 mm, 660 mm (24 in, 26 in)

Super Extreme Service (center hole) –610 mm, 660 mm (24 in, 26 in)

Non-Suspended UndercarriageUndercarriage, non-suspended, heavy dutyUndercarriage, SystemOne

(with center tread idlers)

ROLLER OPTIONSCarrier rollersSeals, arctic, idler/rollerRollers, arctic/pinsCartridge pins, arctic

HYDRAULICSHydraulics, dual tiltHydraulics, pin pullerHydraulics, ripper

STARTERS, BATTERIES,AND ALTERNATORS

Batteries, cold weatherHeater, engine coolant (240V)Alternator, 150 amp, ducted

ELECTRICALLights, eight, hid hi-mount

OPERATOR ENVIRONMENTVisibility arrangementSeat, heatedSeat, cloth heated/ventilatedScreen group – sun

INTEGRATED TECHNOLOGYAccuGrade Attachment Ready OptionAccuGradeComputer Aided Earthmoving System

(CAES)Cat Grade ControlAutoCarryAutomatic Ripper ControlAuto Blade Assist

GUARDSGuard, fuel tankGuard, fast fuelGuard, center tread idler sealsGuard, transmissionGuard, fan debris

OTHER ATTACHMENTSCounterweight, rearDrawbar, rigidCounterweight, additional

WINCHESWinch, variable speed

BULLDOZER LIFT CYLINDERS(FOR 8SU, 8U, 8A AND 8LGP BLADES)

Cylinder, lift with lines – RHCylinder, lift with lines – LH

OTHER BULLDOZER ATTACHMENTSDual tilt arrangement

GROUND ENGAGING TOOLS/ATTACHMENTS

Ripper single-shankRipper multi-shankPin pullerTooth, multi-shank ripperTooth, deep ripping

17

Notes

18

19

D8T Track-Type Tractor

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

© 2011 Caterpillar Inc.All rights reserved

Materials and speci�cations are subject to change without notice. Featured machinesin photos may include additional equipment. See your Cat dealer for available options.

CAT, CATERPILLAR, 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.

AEHQ6143-01 (03-2011)Replaces AEHQ6143