Catalogo de Tractor de Ruedas 844 (ingles) - pdf

844Wheel Dozer

Blade Capacities 15.9 to 30.7 m3 20.7 to 40.2 yd3

Operating Weight 69 227 kg 152,619 lbCat 3412E HEUI Engine

Gross Power 503 kW 675 hpFlywheel Power 466 kW 625 hp

2

844 Wheel DozerStrong power train combined with a heavy-duty front frame provides long life andeconomical operation.

EngineThe Caterpillar 3412E HydraulicElectronic Unit Injection (HEUI) enginedelivers power and efficiency in themost demanding applications. Engineperformance and decreased fuelconsumption are achieved through theHEUI fuel system. pg. 4

Power TrainThe Caterpillar planetary power shifttransmission and Impeller ClutchTorque Converter with lockup clutchprovide smooth, consistent shifting withrimpull control and direct driveefficiency. pg. 4-5

StructuresThe 844 features a box-section rearframe and four-plate front frameproviding strength and stability.Together they provide resistance todozing shocks and stresses whileabsorbing shock loads and twistingforces. pg. 6

Engineered for demanding work in largedozing applications. The 844 Wheel Dozerjoins the Caterpillar wheel dozer line-up as an ideal match for power generatingutilities, smaller scale mines and thegeneral contracting industry.

3

Blades and Blade ControlChoose between 21 and 40 yd3 semi-U,heavy-duty semi-U and coal blades.Replaceable bolt-on cutting edges andbottom wear plates help extend bladelife. A single lever is used tohydraulically control all bladeoperations. pg. 10-11

HydraulicsTwo, independent hydraulic systemsand load-sensing steering are theinvisible force behind the mobility andversatility of the 844. pg. 7

Operator Station Experience a high level of efficiencyand comfort with one-hand operationprovided by the STIC controller and astate-of-the-art cab. Operatorproductivity is also increased withimproved range of viewing, reducedsound levels, improved ventilation andeasy entry and exit. pg. 8-9

ServiceabilityLarge engine doors, rear access stairs,and convenient service platform withlarge doors enhance the serviceabilityof the 844. pg. 12

4

Power Train844 power train components deliver dependable, reliable performance customers expect from Cat wheel dozers.

The Caterpillar 3412E HydraulicElectronic Unit Injection engine is ratedat 466 kW Net (625 hp) at 2000 rpm.HEUI fuel system and ElectronicControl Module (ECM) deliver powerand efficiency in the most demandingapplications. Electronic controlprovides many benefits:

Automatic altitude deration

Elevated low idle

Cold weather starting mode

Acceleration delay on startup to reduce engine wear

Advanced diagnostic capabilities

Automatic control of ether aid

Complete control of injection timingwithout concern for cam profilelimitations. Complete control ofengine speed provides advantages inlower emissions, quieter operation,reduced smoke, improved hot or coldstarting, white smoke cleanup andhigh altitude operation.

Complete control of injectionduration. The HEUI system willdecrease proportionately with enginespeed but can also electronicallycontrol the oil supply pressure. Thisprovides improved engineperformance and decreased fuelconsumption.

Injection rate shaping reduces nitrousoxide (NOx) emissions and reducesengine combustion noise.

1 Aftercooler lowers inlet chargetemperature. Reduces thermal stressesthat can cause premature wear ofpistons, rings and liners.

2 High injection pressures,independent of engine speed,decrease smoke and emissions whileimproving response.

3 Oil-cooled pistons and full-length,water-cooled cylinder liners providemaximum heat transfer for longercomponent life.

4 Engine oil cooler maintains optimumoil temperature for proper coolingand lubrication.

Engine cooling provided by Multi-Row Modular radiator. Hydrostaticfan drive gives the standard coolingpackage 110F ambient capability.

4

3

2

1

5

3 533 mm (21") planetary, electronic,power shift transmission. This is thesame transmission found in the 990Series II wheel loader. Electronicshifting provides smooth consistentshifts with finger tip controls housedin the STIC controller. Thetransmission is built around a centershaft with a gear set cluster stackedend-to-end to distribute load,conserve space and transfer energyefficiently. Large diameter perimeterclutches coupled with high contactplanetary gear sets provide hightorque carrying capacity for long,trouble-free life.

Axle-shaft, oil-disc brakes are fullyhydraulic, completely sealed and neverneed adjustment. Disc face groovesprovide cooling even when brakes areapplied for a long, fade resistant life.

This design provides larger coolingoil reservoir and thicker separatorplates than conventional brakedesigns. This gives the brake higherheat dissipation rates giving it highercapacity than conventional oil-discbrakes.

The location of the brake reducesservice time. Conventional brakesrequire final drive disassembly. Theaxle-shaft brake design allows brakeservice while leaving the final driveintact. Reduced service time andmachine downtime keeps operatingcosts low.

Bevel gear sets and differentials arecommon with the 990 Series II wheelloader.

Impeller Clutch Torque Converterallows the operator to modulate rimpullfrom 100 percent to 20 percent ofmaximum rimpull. After 20 percent ofmaximum rimpull is achieved, furtherpedal travel applies the brake. Thetorque converter is equipped with alockup clutch for direct drive efficiency.

1 Impeller clutch. Locked in fullyengaged position for maximumengine power transfer.

2 Lockup clutch. Provides direct driveefficiency in all three gears withhigher speeds and improved fueleconomy on long distance dozing.

2 1 3

6

StructuresAdvanced design and materials provide superior strength.

Structures on the 844 are more than 90percent robotically welded. Thisprovides highly consistent welds withdeep plate penetration and excellentplate fusion. The benefit is greaterfatigue strength and longer life thanwith conventional welding methods.

Castings in the engine end-frame areused in critical high-stress areas to helpspread the load and reduce the numberof parts. The casting for the reartrunnion mount also serves as an enginemount, which provides a load path forthe weight and torque of the engine totravel down to the trunnion and then onthrough to the axle. Other castings usedin the engine-end frame include: fronttrunnion mounts, steering cylinderbrackets, articulation stops and locklink.

1 Box-section rear frame absorbs shockloads and torsional forces, solidlymaintaining alignment for hitch pinsand driveline.

2 Four-plate front frame providesmaximum structural strength to resisttwisting loads during dozingapplications.

3 Upper and lower hitch pins pivot ondouble-tapered roller bearings and areshaped to direct stress away from theend of the weld, resulting in asmoother transition of stress loads.

4 Spread-hitch design helps square upthe frame and provides moreclearance for hydraulic lines. Doubletapered roller bearings and hardenedpins resist both horizontal andvertical loads to increase life. Thespread hitch also makes serviceaccess easier.

Engine and transmission mounts aredesigned to use mushroom and cup-shaped ISO mounts, reducingcomponent vibration and sound levels.The engine mounts directly to the rearcross member, simplifying andimproving load transfer structure.

1

2

3

4

7

1 Two separate, hydraulic systems. One system is for implements andbrakes while the other is for steeringand hydraulically-driven enginecooling fan. The benefits of theseparate hydraulic systems areincreased cooling and elimination ofcross-contamination. If one systemruns hot or is contaminated, the otherwill be unaffected.

2 Blade control. Armrest-mountedcontrol lever sends signals to a pilotvalve for tilt/tip control and to a mainvalve for lift control.

Tandem vane pumps providehydraulic flow for the lift, tilt and tipfunctions. The circuit is well balancedto provide control when all functionsare used simultaneously.

Well-proven pumps, valves andcylinders are common with thoseused on large, Caterpillar track-typetractors.

For improved serviceability, allhydraulic pumps are mounted on asingle pump drive.

3 Load Sensing Steering with STICControl System is a revolutionarysystem that integrates steering andtransmission into a single controller.The variable displacement pumpmaximizes machine performance bydirecting power through the steeringsystem only when needed. Moreefficient use of power results indecreased fuel consumption andhigher production.

Simple side-to-side motions of theoperators left arm turn the machineright or left.

Transmission shifting forward,neutral, or reverse is controlled by theoperators fingers, and gear selectionis controlled by the operators thumb.

Caterpillars XT-3 and XT-5 hose, O-ringface seals and large-bore lift and tiltcylinders top off the hydraulic system,delivering the performance anddurability owners expect. Reliablecomponents reduce leaks and helpprotect the environment.

Hydrostatic cooling fan is used forengine, transmission and hydrauliccooling. A variable displacement pumpdrives the fans hydraulic motor so thatfan speed varies with rpm. The fandraws only the power needed forcooling, reducing fuel consumption andincreasing efficiency.

1

3

2

HydraulicsWell-balanced hydraulics deliver precise low-effort control and trouble-free operation.

2

8

6

7

2

3

1

Operator StationComfort and control top quality operator station will help maximize productivity.

9

Spacious cab design, incorporatinginnovations for operator comfort andproductivity, include excellent viewingarea, interior sound levels below 75dB(A), Caterpillar Contour Series seat,standard coat hook, cup holder, storagebin, sun visor, intermittent wet-armwipers, and is radio-ready for two-wayradios.

1 STIC Control System is arevolutionary system that integratessteering and transmission into asingle controller. Simple side-to-sidemotions of the operators left armturn the machine right or left.Transmission shifting forward,neutral or reverse is controlled by theoperators fingers, and gear selectionis controlled by the operatorsthumb. These factors combine toproduce a fluid motion that reduceseffort and allows the operator towork the machine for long periods oftime with little or no fatigue.

2 Left foot pedal operates ImpellerClutch Torque Converter for aboutthe first inch of travel, then engagesthe brakes. Within the first inch ofpedal travel, rimpull can becontrolled from 100 percent to 20percent.

3 Contour Series seat with airsuspension and retractable seat beltis designed for comfort and support.Seat cushions reduce pressure on thelower back and thighs whileallowing unrestricted arm and legmovement. The seat has three heightlevels. The retractable seat beltremains off the floor and is easy forthe operator to reach.

4 Quick-shift feature allows quickercycle times by shifting from 1stforward to 2nd reverse.

5 Throttle lock allows operator topreset the engine speed andconcentrate on productivity. Thethrottle lock can be deactivated bypressing the brake pedal.

6 Computerized Monitoring System(CMS) uses a vacuum fluorescentdisplay allowing gauges to be easilyread in direct sunlight or at night.The three category operator alertsystem is retained as part of theCMS. In addition, the systemprovides four diagnostic modes,resulting in easy systemtroubleshooting and minimumdowntime.

7 Seat-mounted hydraulic bladecontrols are attached to the rightside of the seat. They are adjustablefore and aft, with a height-adjustablearmrest so that operators of any sizecan find a comfortable operatingposition. Single lever control allowsoperator to control blade functions:lift/lower, tip and tilt. Switch controlon top of control lever allows optionof single or dual-tilt operation.

8 Torque converter lockup clutch isactivated when operator presses aswitch on the console. The 844automatically shifts from torqueconverter drive to direct drive whena set speed in each gear is reached,providing faster travel speeds andless fuel consumption.

Large, viewing area enhances viewingin all directions. Bonded glass in thefront window eliminates distractingmetal frames with the best operatorvisibility to the blade.

5

4

8

10

Heavy-duty blade linkage is commonwith a Caterpillar D9 Track-TypeTractor. These well-proven componentsare designed for tough applications.

Lift cylinders raise and lower bladefor efficient dozing action.

Two position tilt cylinder mountingfor increased flexibility for variousapplications.

Cutting edges are DH-2 steel. Endbits are DH-3 to provide maximumservice life in tough materials.

Trunnions, pusharms and tag link aresized for large dozing loads.

Single-lever blade control hydraulicallyoperates blade raise, lower, tilt and tip.

Lift circuit features:

Four positions: raise, hold, lower andfloat

Detente hold on float

Tilt/tip circuit features:

Operator selected single or dual-tilt

Finger tip control for tip operation

Low-effort control:

Single-lever implement control

Seat mounted controls

Pilot operated tilt/tip for lower levereffort

Operator has the option of either singleor dual-tilt operation by using a switchlocated on top of control lever. Agenerous range of tilt motion enablesexcellent control for dozing.

Blade ControlWell-proven Cat components deliver dependable service and ease of operation.

11

Resilient and durable Caterpillar bladesare designed with excellent dozing androlling characteristics.

Capacities and widths are set toachieve increased productivity.

Special design allows for spreadingof cover material as well as dozing ofheavier loads.

High-strength, pressed ribconstruction.

Large, Caterpillar track-type tractor,bolt-on cutting edges and bottomwear plates.

Fitted with Caterpillar standardhardware and Ground EngagingTools (G.E.T.).

Rebuildable for long blade life.

1 Coal blade is designed for precise and productive dozing while helping to retain load control with increased capacity for lighter materials.

Wing angles help retain the load while dozing.

2 Semi-U blade combines thecharacteristics of the S and U bladesinto one package.

Increased capacity with the addition of short wings, which include only the dozer end bits, without sacrificing spreading characteristics of straight blades.

The heavy-duty semi-U blade has thesame configuration as the semi-U blade,but it is built with thicker plates formore severe applications.

BladesCaterpillar blades are built to handle tough applications.

1

2

12

Easy maintenance. In addition to theservicing features built into the engine,the 844 includes:

Rear access stairs for easy,comfortable access for operators andservice personnel.

Large engine access doors provideexcellent access to service points,engine oil dipstick, diagnosticconnector, engine oil and fuel filters,starting receptacle, air filter indicator,air filters, fuel/water separator and theether starting aid cartridge.

Large service platform providespassage to hydraulic filter, fuel filland transmission filters through easy-to-open doors.

Large door provides entrance totransmission and pumps when serviceis required.

Large door in platform providesaccess to fuses and electronic controlmodules.

Batteries are accessible throughhinged doors in bumper.

Side access doors on the radiatorguard provide easy access for radiatorcleanout.

Grouped and labeled lube points,accessible at ground level, make dailylube maintenance quick and easy.

Sight gauges in the hydraulic tanksand radiator provide quick check forfluid levels.

ServiceabilityLess time spent on maintenance means more time on the job.

13

Cat Dealers offer a wide range ofservices that can be set up under acustomer support agreement whenpurchasing equipment. The dealer willhelp customers choose a plan that cancover everything from machine andattachment selection to replacement, tohelp get the best return on the machineinvestment.

Selection. Make detailed comparisonsof the machines under considerationbefore buying. How long docomponents last? What is the cost ofpreventive maintenance? What is thetrue cost of lost production? Cat Dealerscan give precise answers to thesequestions.

Operation. Improving operatingtechniques can boost ones profits. Cat Dealers have training videotapes,literature and other ideas to helpincrease productivity.

Maintenance. More and moreequipment buyers are planning foreffective maintenance before buyingequipment. Choose from the dealerswide range of maintenance services atthe time of purchase. Repair optionprograms guarantee the cost of repairsup front. Diagnostic programs such asSOS oil analysis and TechnicalAnalysis help avoid unscheduledrepairs.

Product support. Nearly all parts areavailable at the Cat Dealer partscounter. Cat Dealers utilize a worldwidecomputer network to find in-stock partsto minimize machine downtime. Savemoney with remanufactured parts andreceive the same warranty andreliability as new products at costsavings of 40 to 70 percent.

Replacement. Repair, rebuild orreplace? Cat Dealers can help evaluatethe cost involved so the right choice ismade.

Complete Customer SupportCat Dealer services help keep machines operating longer with lower costs.

14 844 Wheel Dozer specifications

EngineFour-stroke cycle, twelve cylinder, turbocharged, aftercooled 3412E diesel engine.

Ratings at 2000 rpm* kW hpGross power 503 675

Net power 466 625

The following ratings apply at 2000 rpmwhen tested under the specific standardconditions for the specified standard:

Net Power kW hp PS

Caterpillar 466 625

EEC 80/1269 466 625

ISO 9249 466 625

SAE J1349 (JAN90) 461 618

DIN 70020 648

Dimensions Bore 130 mm 5.4 in

Stroke 152 mm 6.0 in

Displacement 27 liters 1649 in3

Features high pressure injectors full electronic control parallel manifold porting with two

intake and two exhaust valves percylinder. Stellite-faced valves, hardalloy steel seats and valve rotators

cam-ground and tapered, aluminum-alloy pistons with three keystonedesigned rings, each cooled by oilspray

steel-backed, copper-bonded,aluminum bearings, through-hardenedcrankshaft journals

pressure lubricated with full-flowfiltered and cooled oil

dry-type air cleaner with primary andsecondary elements

direct-electric 24-volt starting system,75-amp alternator and two, 12-volt190-amp-hour batteries

engine/torque divider module isisolation mounted to the main framereducing machine vibration andstructure-radiated noise

water cooled turbocharged bearing forlonger life

Transmission21" planetary power shift transmissionwith three speeds forward and reverse.

Maximum speeds, forward and reverse,with 45/65 R39 XLD D1A - Type A (L4)tires:

km/h mph

Forward 1 7.2 4.5

2 12.9 8.0

3 22.5 14.0

Reverse 1 8.2 5.0

2 14.2 8.8

3 25.0 15.5

Features electronic shift control self diagnostics accessible through

Computerized Monitoring System quick-shift feature controls for electric shift transmission

are housed in STIC controller Impeller Clutch Torque Converter is

standard with lockup in all three gears

Power rating conditions based on standard air conditions of

25C (77F) and 99 kPa (29.32 in Hg)dry barometer

used 35 API gravity fuel having anLHV of 42 780 kJ/kg (18,390 Btu/lb)when used at 30C (86F) [ref. a fueldensity of 838.9 g/L (7.001 lb/gal)]

net power advertised is the poweravailable at the flywheel when theengine is equipped with fan, aircleaner, muffler and alternator

no derating required up to 2286 m(7,500 ft) altitude

35

40

45

50

55

60

30

25

20

15

10

5

0

100

110

120

130

140

70

80

90

60

50

40

30

20

10

0

lbs x1000

kg x1000

0

GRAD

EABI

LITY

-PER

CENT

(Gra

de +

Rol

ling

Resi

st)

3rd Gear

1st Gear

1st Gear

2nd Gear

3rd Gear

2nd Gear

844Rimpull

vs.Ground Speed

30

25

40

35

45

20

15

10

5

0 4 8 12 16 20 24 km/h

0 2 4 6 8 10 12 14 16 mph

Speed

Rim

pull

Torque Converter Direct Drive

15844 Wheel Dozer specifications

CabIntegrated Rollover Protective Structure(ROPS) is standard.

Features meets OSHA and MSHA limits for

operator sound exposure with doorsand windows closed (according toANSI/SAE J1166 MAY90)

ROPS meets the following criteria:- SAE J394- SAE 1040 APR88- ISO 3471-1986

also meets the following criteria forFalling Objects Protective Structure(FOPS):- SAE J231 JAN81- ISO 3449-1984

ROPS structure is certified for 84 286 kg (185,650 lb) operatingweight

standard machine meets CE 89/392safety directive, and CE 86/662spectator (ISO 6393) and operator(ISO 6394) sound requirements

NOTE: When properly installed andmaintained, the cab (tested with doors andwindows closed according to ANSI/SAEJ1166 MAY90) meets OSHA and MSHArequirements for operator sound exposurelimits in effect at time of manufacture. Theoperator sound pressure level is 75 dB(A)when measured per ISO 6394 or86/662/EEC.

Final DrivesPlanetary final drive consists of a ringgear, 3 planet gears and planet gearcarrier, and a sun gear.

Features ring gears splined to axle housing proprietary gear cutting and heat treat

methods used in the manufacture ofcomponents

full-floating bronze sleeve bearingsused on planet gears

oil-bath lubrication of final drive

AxlesFixed front, oscillating rear (11).

Features maximum single-wheel rise and fall

572 mm (22.5") bevel gear set and differentials Duo-Cone seal between axle hub and

housing axle shaft brakes use SAE 30 or 40W (depending on

temperature) (oil change intervalevery 2000 hours or 1 year)

BrakesSystem meets SAE/ISO regulations.

Service brake features fully hydraulic, completely enclosed

and sealed, oil-disc brakes adjustment free separate circuits for front and rear

axles high capacity axle-shaft design easy access for service dual pedal braking

Parking brake features multiple-disc, oil-enclosed brake located on transfer gear case output

shaft

Secondary brake features Computerized Monitoring System

alerts operator if pressure drops below875 psi (6035 kPa) and automaticallyapplies parking brake

manual override possible to allowmovement of machine

TiresTubeless, low-aspect ratio. All steelradial construction for increased tractionand stability, lower rolling resistance.

Tire choices 45/65 R39 L-4 (XLDDIA), Michelin 40.5/75 R39 1-Star, Goodyear

NOTE: Caterpillar recommends that youconsult a tire supplier to evaluate allconditions before selecting a tire model.Other special tires are available on request.

Monitoring SystemComputerized Monitoring System usestechnology to make a dramaticdifference in operator efficiency,machine productivity and availability.

Features gauges display engine coolant

temperature, transmission oiltemperature, engine oil pressure,hydraulic oil temperature and fueltank level

tachometer/speedometer displaysengine speed and gear indicator

alert indicators include: chargingsystem, parking/secondary brake,supplemental steering, brake oilpressure, engine coolant flow andtransmission filter status


Implement system with double-section vane pumpOutput at 2126 rpm and 6894 kPa (1000 psi)

with SAE (No 10 oil at 66C 150F) 342 L/min 89 gpm

Cylinders, double-acting:lift, bore and stroke 133.5 mm x 1535 mm 5.25" x 60.5"

Cylinder, double-acting:tilt and tip, bore and stroke 209.5 mm x 188 mm 8.25" x 7.5"

Relief valve setting

Bulldozer (large pump) 18 650 kPa 2700 psi

Tilt cylinders (small pump) 20 150 kPa 2920 psi

Implement Hydraulic SystemCompletely sealed system with innovative low-effort controls.

Features (standard) completely enclosed system two independent systems. One for

steering and hydraulically-drivenengine cooling fan, one forimplements and brakes

Cat built main implement pumps Caterpillars XT-3, XT-5 hose used

on entire machine except pilot lines incab

full-flow filtering reusable couplings with O-ring face

seals

Service Refill CapacitiesU.S.

L Gallons

Fuel tankstandard 930 245

Cooling system 183 47.5

Crankcase 50 13

Transmission 70 18

Hydraulic tank 541 141

Differentials and final drives

Front 218 56.5

Rear 218 56.5

Hydraulic system

Implement and brakes

Tank only 174 45

Steering and engine cooling fan

Tank only 129 33.5

Min. turning radius(over tires) 9910 mm 32' 6"

Hydraulic output at 2128 rpm and 1000 psi (6900 kPa)

410 L/min 108 gpm

Relief valve setting31 005 kPa 4500 psi

Features STIC control steering system center-point frame articulation front and rear wheels track hydraulic power with efficient, load-

sensing system variable displacement piston pump steering angle of 35 in each direction,

one-hand operation full flow filtering

SteeringFull hydraulic load sensing steering system meets SAE J1511 FEB94 and ISO 5010:1992 specified standards.


844

ROPS5142 mm(16' 9")

4600 mm(15' 1")

10 940 mm(35' 9")

2300 mm(7' 7")

3471 mm(11' 5")

552 mm(22")

3469 mm(11' 5")5185 mm

(17' 0")

Dimensions All dimensions are approximate.

NOTE: Dimensions vary with blade. Refer to blade specifications chart on page 18.


Blade Overall Digging Ground Maximum Total OperatingType Capacity Width Height Depth Clearance Tilt Weight WeightSemi-U 15.9 m3 5418 mm 1813 mm 465 mm 1459 mm 829 mm 7273 kg 69 227 kg

20.7 yd3 213.3" 71.4" 18.3" 57.4" 32.6" 16,034 lbs 152,619 lbs

Heavy-dutySemi-U 15.9 m3 5278 mm 1877 mm 609 mm 1372 mm 940 mm 7763 kg 69 717 kg

20.7 yd3 207.8" 73.9" 24" 54" 37" 17,100 lbs 153,685 lbs

Coal 30.7 m3 5846 mm 2289 mm 609 mm 1372 mm 940 mm 6273 kg 68 227 kg40.2 yd3 230" 90" 24" 54" 37" 13,830 lbs 150,415 lbs

Semi-U Blade: This unit combines the characteristics of the S and U blades into one package. It has increased capacity by the addition ofshort wings which include only the dozer end bits.

Blade Specifications

Blade ControlsMechanical operated raise/lower circuit.Pilot operated tilt/tip circuit.

Lift circuit features four positions: raise, hold, lower and

float detente hold on float

Tilt/tip circuit features operator selected single or dual tilt finger tip control for tip operation

Control single-lever implement control seat mounted controls pilot operated tilt/tip for lower lever

effort


Standard EquipmentStandard and optional equipment may vary. Consult your Caterpillar Dealer for specifics.

ElectricalAlternator, 105-ampere Converter, for 12-volt accessoriesDiagnostic connector for starting and

charging systemsElectric starter (heavy-duty)Electrical system, 24-voltExternal lighting system, front and rearMaintenance-free batteriesStarting receptacle for emergency

starting

Operator environmentAir conditioner, R-134A refrigerantContour Series Seat with air suspensionCigarette lighter and ashtray Coat hookComputerized Monitoring System

Action alert system, three-categoryGauges:

tachometerfuel levelhydraulic oil temperaturetransmission oil temperatureengine oil pressure coolant temperature

Dome light (cab)Electric horn

External two-post ROPS structureHeater and defrosterLoad-sensing steering Quick-shift feature Radio-ready cab for entertainment or

two-way radio (three-point mounting)Rearview mirrors (interior and exterior

mounted)Retractable seat belt 76 mm (3") wideROPS cab with sound suppressionSeat-mounted hydraulic controlsSight gauges, hydraulic oil and engine

coolantSingle-lever blade controlSTIC Control SystemStorage for thermos, lunch box, cupSunshade/visor, front and rearThrottle lockTinted glassTransmission gear indicatorWet-arm wiper/washers, front and rear

Power trainCat 3412E HEUI engineFuel priming aidFull hydraulic, enclosed, wet multiple-

disc service brakes andparking/secondary

Impeller Clutch Torque Converter with lockup clutch

Precleaner/ejectorRemote-mounted hydraulic engine fanSeparated cooling systemSound suppressed mufflerSupplemental steeringSwing-out cooler coresTransmission,

21" planetary power shift (electronic)3-speed forward/3-speed reverse

Other standard equipmentBackup alarmDrawbar hitch with pinFenders (front and rear)Hydraulic oil coolerMufflerLighting, general purpose (four)Locking engine enclosuresPower train/guardRear access stairsVandalism protection and caplocks

Tires45/65 R39 L-4 (XLDDIA), Michelin

kg lb

Blades

Semi-U 7273 16,034

Heavy-duty Semi-U 7763 17,100

Coal 6273 13,830

Fuel system 1 3

High Ambient Cooling Arrangement 60 132

Oil change system 5 11

kg lb

Quarter panel wiper washer 17 38

Starting aids

Cold weather starting system 180 396

Diesel fuel heater 4 9

Heater, engine coolant 3 7

Tires 40.5/75 R39 1-Star, Goodyear -1030 -2,272

Optional EquipmentWith approximate changes in operating weights.

844 Wheel Dozer

AEHQ5307 (3-98)

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

See your Caterpillar Dealer for available options.

www.CAT.com 1998 Caterpillar

Printed in U.S.A.

Engineering

Catalogo de Tractor de Ruedas 844 (ingles) - pdf