®973CTrack Loader

Bucket CapacitiesGeneral Purpose 3.2 m3 4.2 yd3

Multi-purpose 2.9 m3 3.8 yd3

Operating Weight G.P. Bucket + Teeth & Seg. 27 006 kg 59,548 lb

Cat® 3306 EngineFlywheel Power 156.6 kW 210 hp

Hydrostatic DriveHydrostatic drive with electroniccontrol offers modulated precision forquick, smooth operation and superiormaneuverability. Two drive systemspeed modes allow the best match to jobconditions. The Electronic HydrostaticControl (EHC) is self-diagnosing andthe two separate hydraulic drive pumpsare easy to access for serviceability. pg. 4

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EngineThe Cat 3306 DITA Engine is designedfor performance, durability,serviceability, low emissions and fueleconomy. pg. 5

Top performance. A machine designed to be productive overa wide range of tough applications, fromheavy clearing to high volume truck loading,from the slag pits of steel mills to big citylandfills. The 973C can not only master thetoughest excavation but it can finish gradewith delicate precision.

Reliable, durable operation. Rugged construction, self diagnosis ofelectrical and power train systems, and easymaintenance help ensure extended servicelife with low operating costs.

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Operator Station and ControlsThe Caterpillar® C-Series Track Loaderis designed for greater operatorproductivity. Pilot-operated hydrauliccontrols for precise, consistentequipment control — together withadjustable magnetic lift kickout andbucket positioner, help reduce operatorfatigue. In the cab, reduced noise level,adjustable armrests, and Cat ContourSeries seat improve operator comfort.Large, tinted windows, sun visor,improved front wiper, and defrostcapability improve viewing of workareas. pg. 6Computerized Monitoring System

The Caterpillar ComputerizedMonitoring System (CMS) serves as theinterface between the operator and theElectronic Hydrostatic Control (EHC)of the drive train, as well as providinggauges and indicators of machinefunctions. The CMS permits quick andsimple calibration of the hydrostaticsystem and diagnostics of the powertrain and electrical systems.pg. 7

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973C Track LoaderState-of-the-art design and superior quality allow you to maximize productivity.

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StructureThe box-section main frame is designedspecifically for the work of a trackloader. It provides durability, resistanceto twisting and a solid base for allcomponents. The Z-bar linkage offersincreased breakout force and fast dumpspeed for enhanced productivity. pg. 8

Oscillating UndercarriageImproved traction, increased machinestability, and reduced frame impact arebenefits of the Cat oscillatingundercarriage. The Cat sealed andlubricated track reduces pin and internalbushing wear, reduces componentfriction and track noise, extending tracklife. pg. 9

✔ New feature

Work Tools and Special ApplicationAttachmentsA large choice of buckets, GroundEngaging Tools (G.E.T.), as well asvarious specific attachments, allowconfiguration of the 973C for maximumperformance in virtually any job. Inextreme or specialized applications,such as sanitary landfills, steel mills,material handling, demolition, shipholdunloading, or other low ground pressureapplications, Cat can provide theneeded attachments. pg. 10-11

Complete Customer SupportThe 973C design offers reducedmaintenance, convenient access tocomponents, easy diagnosticcapabilities, as well as easy andeconomical component replacementpossibilities. Cat Dealers also providequick parts availability, preventativemaintenance programs and flexiblefinancing. pg. 12

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The Hydrostatic Drive eliminates theneed for transmission shifting, whichallows the operator to concentrate onworking, maneuvering and production.

The Electronic Hydrostatic Control(EHC) controls the hydrostaticdrive system.

■ Electronic Hydrostatic Controlautomatically adjusts machine speedto give the equipment hydraulicsystem priority, while the hydrostaticsystem takes advantage of allavailable engine power.

■ It maintains engine rpm in optimumoperating range and balances the twotrack drive systems for straight travelwithout machine drift.

■ The Electronic Hydrostatic Controlinterfaces with the ComputerizedMonitoring System. It is self-diagnosing, and fully compatible withElectronic Technician (ET) software.This software-hardware interfaceenables your Caterpillar dealer toquickly and accurately calibrate andtroubleshoot a machine.

Variable displacement pumps andvariable displacement drive motorsare electronically controlled byEHC, offering high efficiency andprecise travel.

■ Each track is driven by a separatehydraulic circuit consisting of onevariable-displacement piston pump,connected by Caterpillar’s XT-6hydraulic hose and couplings toa variable-displacement piston motor.

Separate hydraulic pumps offer easyservicing. Pumps are shown in yellowabove.

Independent power to each track forspeed, maneuverability, or sideslopeoperation.

Power turns for added control, speedand versatility. The ability to turn underpower gives greater productivity whendozing, grading, or backfilling.

Counter rotation allows spot turns intight space conditions.

Travel speeds are infinitely variablebetween zero and top speed. Theoperator may select one of twooperation modes. “Work mode”optimizes the torque characteristics ofthe power train for maximumproductivity and is therefore theappropriate choice for mostapplications. An operator will choose“travel mode” to optimize the speedcharacteristics of the power train forapplications requiring long traveldistances.

Hydrostatic DriveThe electronically controlled hydrostatic drive helps provide quick response for shorter cycletimes and increased productivity.

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The Cat 3306 Diesel Engine is a sixcylinder, four-cycle design thatprovides long, effective power strokesfor high torque and more complete fuelcombustion.

Rear engine location allows superbforward viewing area while serving asa natural counterweight. It also allowsbucket-on-the-ground service checksand maintenance, plus reduced radiatorplugging and maintenance.

Direct-injection fuel system

■ High-injection pressures and shortinjection duration provide fastresponse, clean burning and addedfuel savings.

■ Adjustment-free unit injectorsprovide efficient, precise fuelmetering.

Turbocharger packs more air in thecylinders for excellent combustion andincreased engine efficiency.

Aftercooler cools the inlet air for moreefficient combustion and extended lifeof the piston rings and bore.

Extended life coolant, standard in theengine cooling system, reduces the needfor maintenance.

High displacement-to-power ratioprovides extended engine life andexceptional reliability.

Extended life design.

■ Seven main bearings provide a largebearing surface area to distributeforce loads in the engine.

■ Durable alloy steel valves.

■ Easily replaceable crankcase seals.

■ Two oil jets per cylinder cool eachpiston for reduced piston and ringtemperatures, increasing the life ofcylinders and pistons.

EngineProvides power, reliability and acts as a working counterweight in the rear of the machine,for optimum machine balance.

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1 Caterpillar Contour Series seat isergonomically designed and fullyadjustable for maximum operatorcomfort and control — throughoutthe work day.

■ Cushioned side bolsters preventside-to-side movement.

■ Backrest centerline conforms tothe operator’s natural spinalcurve.

■ Contoured base curves away fromlower back to reduce pressure.

■ 76 mm (3 in) wide seat belt isretractable for positive,comfortable restraint.

■ Air suspension option is availablefor even greater operator comfort.

2 Adjustable armrests can bepositioned up or down. The rightarmrest is adjustable forward andbackward. Each armrest can beinclined to different angles forexcellent operator comfort andcontrol.

Easy, precise operation of hydrostaticdrive system for quick speed anddirection changes and maximummaneuverability.

5 Hydrostatic drive control (see page 4).

6 Brake pedal is supplementary tohydraulic braking provided byhydrostatic system.

7 Pedal steering for precise control of each track independently and on-demand counter-rotation withoutneed to stop machine.

Speed mode switch allows operator tochoose between “work mode” for finecontrol or tight truckloading, or “travelmode” for maximum drive speed — tobest match machine speed to jobconditions (see page 7 for location).

Pilot operated equipment controls areeasy to operate for greater productivity.

8 Single lever pilot control for bucketlift and dump (2-lever control isoptional).

■ Simultaneous bucket lift and dumpfor fast controlled truck loading,smooth grading, and the ability tometer material from bucket.

■ Automatic, adjustable magnetic liftkickout and bucket positioner allowthe operator to concentrate onpositioning the machine rather thanthe bucket, resulting in higherefficiency for greater productivity.

9 Optional pilot-operated control forripper or multi-purpose bucket.

3 Improved air circulation systemdelivers filtered, pressurized andtemperature-controlled air through10 louvered vents. Integral airconditioning system is available.Heater with controls is standard onboth cab and canopy-equippedmachines.

4 Storage spaces include a lockablestorage box, a lunch boxcompartment, beverage holder, andcoat hook.

Sound-suppressed Rollover ProtectiveStructure (ROPS)/Falling ObjectsProtective Structure (FOPS) cab isresiliently mounted for reducedvibration and a quiet workingenvironment.

Enhanced viewing area to the front,sides and rear of the machine. Tintedwindows, sun visor, washers andwindshield wipers are all standard oncab machine. The front wiper hasvariable speed, intermittent control.

Radio installation arrangement, 24 to12-volt converter, radio mountingspace, and speakers are standard oncab-equipped machines.

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Operator Station and ControlsDesigned for operator comfort and ease of operation.

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The Computerized Monitoring Systemoffers three main functions:

■ Quick and simple calibration of thehydrostatic drive system.

■ Alerting the operator of particularsituations can help prevent damage.For maximum reliability, anautomatic self-test is performed bythe system during every start.

■ By monitoring hydrostatic andelectrical systems, the CMSidentifies component(s) affectedand logs the abnormal values ofmeasured parameters in memoryto aid service personnel introubleshooting and repairs.

1 The gauge cluster contains fourgauges which monitor the followingfunctions:

■ Fuel level.

■ Engine coolant temperature.

■ Powertrain oil temperature.

■ Hydraulic oil temperature.

2 The warning cluster groups theindividual alert indicators of thefollowing:

■ High engine coolant temperature.

■ High powertrain oil temperature

■ Low engine oil pressure.

■ Air inlet heater activated.

■ Low hydrostatic system chargepressure.

■ High pump drive gear boxtemperature

■ High pump drive oil temperature.

■ High hydraulic oil temperature.

■ Low alternator output.

■ Diagnostic fault detected by EHC(Electronic Hydrostatic Control).

■ Low fuel level.

3 The digital display can show theoperator’s choice of hour meter,engine rpm, charge pressure orservice codes.

The Computerized Monitoring Systemalso functions as a warning systemwith three levels of warning:

■ Operator awareness. An alertindicator signals a potential,non-critical situation.

■ Operator response required. Inaddition to the alert indicator, theaction warning light (4) flashes toindicate that continued operationcould cause component damage.

■ Immediate safe shutdown. An alertindicator illuminates the actionwarning light, flashes, and theaction alarm sounds to alert theoperator that continued operationwill cause immediate componentdamage or a safety devicemalfunction.

5 Key start/stop switch

6 Speed mode switch (see page 6 fordescription).

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Computerized Monitoring System (CMS)Quickly indicates servicing needs to reduce downtime.

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Strong box-section main frame design,with continuous, deep-penetrationwelds resists twisting loads to protectcomponents from excessive wear ordamage without adding extra weight tothe machine.

■ Four-plate loader tower distributesforces evenly from the lift arms tothe main frame, which eliminatestwisting for maximum structuraldurability.

■ Castings (in red on the illustrationon the right) are used in areas ofhigh stress concentration. Largeradius curves dissipate stresses thatcould cause fatigue and cracking.

■ Mild-steel frame sections alongwith castings provide flexibility,durability and excellent resistanceto impact loads.

■ Durability designed and built intothe structures provides extendedservice life and allows for multiplerebuilds.

1 Z-bar linkage. Breakout force isexceptionally high due to themechanical advantage of Z-Bar linkage design with hydraulicpressure applied to the head end ofthe tilt cylinder.

■ Dump speed is faster becausedump oil flows into tilt cylinderrod end.

■ Straddle mounting supports alllift arm pivot points on both endsof the pin, eliminating twistingforces and enhancing structuraldurability.

■ Sealed loader linkages, includinglow maintenance oil-lubricatedlower bucket pins, substantiallyreduce maintenance time andlubrication requirements.

■ Linkage simplicity reduces thenumber of parts and servicepoints.

StructureBox-section main frame is designed to handle heavy loads, while Z-Bar linkage maximizesbreakout force.

Trapezoidal Center Hole Shoes2

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Oscillating Undercarriage allowsmovement of each track independentof main frame.

■ Reduces frame impact and improvestraction over a rigid undercarriagedesign.

■ Increases stability in rough terrain.

Swing link idler permits horizontalidler movement, absorbing shock loadsand maintaining proper track tension,while eliminating the need for shimsand wear strips.

Tracks are sealed and lubricatedto keep abrasives out and virtuallyeliminate pin and internal bushing wearto keep maintenance costs down. Thesetracks also reduce component frictionfor less track noise and greater powertrain efficiency.

Bolt-on sprocket rim segments allowreplacement of worn sprocket teethwithout opening the track chain.Through-hardened steel forgingprovides extended service life.

Two-piece split master link allowseasy track chain removal andinstallation.

Caterpillar brand undercarriagecomponents are well-matched to eachother and the machine for superior lifeand cost-effective operation.

Shoe options:

1 Double grouser shoes, standard, aredesigned for good traction, easyturns, and reduced bending.

2 Trapezoidal center hole shoes letthe sprocket push out dirt anddebris, reducing packing betweenthe shoe and the bushing.

3 Single grouser shoes increasepenetration and traction in lowerimpact and lower abrasionconditions.

4 Chopper shoes are single grousershoes with additional diagonal sidegrousers for increased choppingability. Recommended for landfills,transfer stations and demolitionapplications.

■ Extreme service shoes areavailable which have morehardened wear material for longerwear life and higher impactapplications.

■ Wider shoes are also available toreduce ground pressure in softunderfoot conditions.

Other shoe options are available.Consult a Caterpillar Dealer for moreinformation.

Chopper Shoes

Double Grouser Shoes1

Single Grouser Shoes3

Oscillating UndercarriageKeeps more track on the ground for maximum traction and stability. Several shoe optionsprovide best match to job conditions.

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1 General Purpose (GP) bucket isdesigned for excellent loadabilityand long life in applications such ashard bank excavating, stripping, andstock pile loading.

■ High-strength, low-alloy steel forresistance to dents and abrasions.

■ Shell-tine reinforcements supportrear of bucket for increasedstructural strength.

2 Multi-purpose (MP) buckets aredesigned for a broad range ofapplications, such as: loading,stripping, clearing, bulldozing,picking up debris, and fine grading.

■ Bucket clamps hydraulically togrip logs or handle other tough-to-grasp materials.

■ Extreme-service version availablefor special applications.

3 Ripper-Scarifier adds extraversatility to expand the applicationof the machine.

■ Hinged-type, with three shanks,beam mounted with two pinspressed into each side ofmain frame.

■ Raised and lowered with twowide-mounted cylinders.

■ Six pin linkage requires nolubrication.

Bucket base edge protection options:

4 Bolt-on adapters, tips and bolt-onreversible edge segments providea clean working floor and increasebucket capacity. Heavy-dutysegments are available (with62 percent more wear materialthan on standard segments).

5 Bolt-on, 2-strap adapters and tips,including corner adapters, offerexcellent penetration.

6 Bolt-on cutting edges, reversible,are ideal when penetration is nota consideration, such as in clean-upwork or stockpiling applications.

7 Weld-on, top-strap adapters arealso available with a GP bucket.They are flush-mounted with thebottom of the cutting edge toprovide a smooth bucket bottomand unrutted work surface. Theseadapters can be used with any of thetip options (not with a bolt-onprotection system).

Tip options:

■ Short: extremely strong — use in highimpact and pry-out work such as rock.

■ Long: use in most general applicationswhere breakage is not a concern.

■ Heavy-duty, long: use in generalloading and excavation work.Thirty-six percent more wear materialthan on standard. Provides increasedstrength, extended service life,and low cost-per-hour.

These and other G.E.T. options areavailable from Caterpillar Dealers.

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Work ToolsA variety of attachments and Ground Engaging Tools (GET) are available to maximizeperformance in any application.

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Waste handling/demolitionattachments provide added versatilityand are designed to make the 973Cperform well in landfills, wastehandling or demolition applicationswhere the machine spreads, compacts,sorts, shreds and crushes materials.

■ Bucket trash racks increase bucketcapacity. Increases productivity whenhandling low density material andprotects machine linkage from debris.

■ Extensive guarding, variousprotections, and heavy-dutycomponents protect the machine fromdebris in the very severe conditions ofwaste handling or demolition.

■ Easy servicing is designed into everycomponent design such as thefollowing features:

– Heavy-duty radiator grill can swingout for quick access to maintainradiator.

– Turbine-type pre-cleaner removeslarge particles from incoming airand prevents them from reducingair filter life.

Shiphold attachments allow the 973Cto work in the confined and harshshiphold environment where themachine assists in the off-loading ofbulk materials, such as iron ore, steelscrap, coal, minerals and grain.

■ Lifting hooks, reinforced lift-arm anda locking group ensure well-balancedand secured lifting of the machineinto shipholds.

■ Heavy-duty rear bumper providesextra protection to the radiator andrear of the machine.

Special Application Attachments Special attachments are available or can be designed on request to allow the 973C to workin special applications.

Steel Mill attachments enable the 973Cto perform in the most adverseconditions.

■ Heavy-duty components ensuredurability and reliability in slag-handling applications.

■ High temperature seals areincorporated into final drives, idlers,track rollers and carrier rollers.

■ Sealed track is non-lubricated andequipped with Belleville washer-typeseals to meet the demands of the hotsteel mill environment.

■ Hydrostatic drive provides excellentmaneuverability in tight millconditions.

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Reduced maintenance.

■ Batteries are maintenance-free.

■ Caterpillar Extended Life Coolantallows extended change intervals(6,000 hours).

■ Sealed electrical connectors lock outdust and moisture.

■ Cat sealed and lubricated tracksminimize pin and internal bushingwear and reduce maintenance costs.

■ Caterpillar XT hydraulic hose, inmedium and high pressure circuits,offers high abrasion resistance and farexceeds industry standards.

■ O-Ring Face Seal (ORFS) hydrauliccouplings help eliminate fluid leaks,provide positive coupling headseals and are reusable for lowoperating costs.

■ Lower bucket pins are low-maintenance and oil-lubricated.

■ S•O•S Fluids Analysis helps avoidunnecessary downtime and maintainsthe machine value.

Easy access to components.

■ Hydraulic and fuel filters are locatedclose to each other for easymaintenance.

■ Rear engine location allows bucket-on-the ground service checks andmaintenance.

■ Ground-level access tolubrication points.

■ Hinged doors allow quick access tothe engine, hydrostatic system alongwith the battery and tool boxes.

Easy diagnosis.

■ The Computerized MonitoringSystem and self-diagnosing EHCwork together to warn against bothoccurring and impending faults toreduce downtime.

■ Rapid, easy calibration andtroubleshooting of hydrostatic andelectrical systems are performedthrough CMS and EHC systems.

■ Electronic Technician (ET) softwareis fully compatible with the EHC andprovides further diagnostic capabilities.

■ Quick-disconnect hydraulic pressuretaps allow quick diagnosis of thehydraulic system. More commonlyused pressure taps are clustered insidethe left engine door for easy access.

Easy component servicing.

■ Removable cab floor-panels for easyaccess to internal components.

■ Hydrostatic drive system withseparate pumps and motors for lowreplacement or rebuild cost.

■ Color-coded and numbered electricalwiring for easy repair.

■ Split master link to easily open thetrack chain.

■ Segmented drive sprocket for easyrepair without splitting the track,as well as reduced replacementcosts and less downtime.

■ Caterpillar XT hydraulic hosesoffer excellent flexibility foreasy installation.

■ Bolted grab irons are easilyreplaceable.

Low cost components replacement.Economical CaterpillarRemanufactured parts are available foreconomical component replacement.Many Remanufactured parts areavailable for use in the 973C engineand hydraulic system.

Preventive maintenance programs.Ask your Cat Dealer for help withmanaging machine service.

Parts availability. Most Cat partsare immediately available from anyCat Dealer. Cat Dealers rely on aworldwide computer network tofind parts instantly, minimizingmachine downtime.

Flexible financing. Cat Dealers canarrange affordable financing for theentire Caterpillar line. Contact yourDealer to learn how terms can bestructured to match cash flows.

Complete Customer SupportCaterpillar’s total commitment to customer support and simplified service is part of everyCat machine.

973C Track Loader specifications 13

DriveHydrostatic drive provides infinitemachine speeds up to 9.0 km/h (5.6 mph), forward or reverse.

Features

■ drive pumps: two variable-displacement, over-center, slipper-type axial piston pumps

■ track motors: two variable-displacement, bi-directional, piston-slipper-type motors

■ full flow filtering of hydrostatic drivesystem oil

■ relief valve settings: 42 000 kPa/420 bar/6,090 psi

■ charging pumps: two gear-type,mounted on the drive pumps,supply fluid to control systemand drive pumps

■ Electronic Hydrostatic Control (EHC)system controls each pump and motorfor maximum machine performance

■ Two speed modes to vary top speedelectronically

Ratings at 2200 RPM* kW HP

Gross power 171 229

500 mm (19.7") 675 mm (26.6")Shoe Shoe

Track rollers (each side) 7 7

Number of shoes (each side) 40 40

Length of track on ground 2917 mm 115" 2917 mm 115"

Ground contact area 2.92 m2 4522 in2 3.94 m2 6104 in2

Ground pressure .889 bar 12.9 psi .659 bar 9.57 psi

Grouser height (double grouser) 49 mm 1.93" 49 mm 1.93"

Gauge 2080 mm 82" 2080 mm 82"

Features

■ direct-injection fuel system withindividual adjustment-free injectorsfor each cylinder

■ 3-ring, aluminum-alloy pistons,cam-ground, tapered and cooledby oil spray

■ steel-backed aluminum bearings ■ tapered connecting rods ■ pressure lubrication with full-flow

filtered and cooled oil■ dry air cleaner with primary and

secondary elements ■ induction-hardened, forged crankshaft ■ direct-electric 24-volt starting and

charging system with 12-volt,100 amp-hour batteries

■ standard ether starting aid■ standard oil cooler■ heavy duty battery group optional

*Power rating conditions

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

■ no derating required up to 2250 maltitude

■ Exhaust emissions: The Caterpillar3306 T engine meets non-roadregulatory emission requirementsworldwide, including USEnvironmental Protection Agency(EPA), European Union (EU) andJapan Ministry Of Construction(JMOC).

Net power kW HP

ISO 9249 156.6 210

SAE J1349 — 207.6

EEC 80/1269 156.6 210

DimensionsBore 121 mm 4.75"

Stroke 152 mm 6.00"

Displacement 10.45 liters 638 cu in

The following ratings apply at 2200 RPM when tested under thespecified standard conditions forthe specified standard:

UndercarriageTwo-piece master link for easy track removal and installation. All rollers and idlershave Duo-Cone Floating Ring Seals and are Lifetime Lubricated.

EngineFour-stroke cycle, six cylinder Cat 3306 turbocharged aftercooled diesel engine.

14 973C Track Loader specifications

Lift Arms

Features

■ solid-steel lift arms are straddlemounted to a fabricated single unitmain frame

■ integral loader tower features widebase, “A” frame profile

■ straddle mounted pins are supportedon both ends to eliminatetwisting forces

■ Caterpillar cartridge pins at thebucket – lift arm joints eliminateroutine maintenance

Final Drives

Features

■ planetary gears■ isolated from machine weight and

ground-induced shock loads by trackroller frame pivot shafts

■ externally mounted for easymaintenance and service

Hydraulic system, vane-type pump

Output at rated engine rpm and 6900 kPa (1,000 psi) 335 L/min 89 gpm

Relief valve setting (main) 19 000 kPa/190 bar 2755 psi

Cylinders, double acting, bore and stroke

Lift 165 x 935 mm 6.5 x 36.8"

Tilt 140 x 633 mm 5.5 x 24.9"

Pilot system, gear-type pump

Output at rated engine speed and 2400 kPa/24 bar (348 psi) 12 L/min 3.2 gpm

Relief valve setting 2850 kPa/28 bar 413 psi

Hydraulic cycle time

Raise 6.4 seconds

Dump 1.7 seconds

Lower, empty, float down 2.5 seconds

Total* 8.9 seconds

Bucket controls

■ lift circuit (raise, lower, hold, float): automatic kickout in raise is adjustable todesired height

■ tilt circuit (tilt back, hold, dump): automatic bucket positioner is adjustable todesired digging angle

* With simultaneous raise and dump, dump time is included in raise time.

Features

■ large capacity, one-section, vane-typepump, mounted on hydrostatic pumpdrive housing

■ double-spool, spring-centeredoperating valves, located under loaderframe crossmember for easy access

■ lines are steel tubing and highpressure hose (XT-3 hose for the liftand tilt lines; XT-5 hose for the MPbucket and ripper lines) with flaredfittings at connections

■ system sealed to keep out wear-causing dirt

■ protected by full-flow filter on returnline, helping prevent foreign materialfrom entering reservoir

■ pilot-operated control valves requirelow operator effort while retainingdelay free bucket control

■ permits simultaneous lift anddump for fast truck loadingand smooth grading

■ O-Ring face seals

BrakesMeets ISO standard ISO10265 1998.

Service brake features

■ hydrostatic, through machine drivesystem using transmission lever orcenter brake pedal

Secondary and Parking brake features■ oil-disc brakes located between each

hydraulic track motor and final drive■ each set has six steel discs splined to

final drive input pinion, and sevenfriction discs splined to brake housing

■ spring applied when transmissionlever is in zero speed position orcenter brake pedal is fully depressed

■ hydraulically released by oil pressurefrom hydrostatic drive system

■ spring automatically applied in theevent of transmission hydraulic oilpressure loss

Equipment HydraulicsOpen-centered, interrupted series system with full-flow filtering. System is completely sealed and features simultaneous lift anddump as well as pilot-operated controls.

15973C Track Loader specifications

CabCaterpillar cab and Rollover ProtectiveStructure (ROPS) are standard.

Features

■ meets OSHA and MSHA limits foroperator and sound exposure withdoors and windows closed (accordingto ANSI/SAE J1166 MAY90)

■ when equipped with sound-suppression attachment, meets thefollowing operator and spectatordynamic dB(a) sound requirements:– operator: 81 per ISO 6396,

95/27/EEC– spectator: 111 per ISO 6395,

95/27/EEC

■ ROPS/FOPS meet the followingcriteria:– SAE J1040 (APRIL88) – ISO 3471 (1994)– SAE J231 JAN81– ISO 3449-1984

■ operator’s compartment features aComputerized Monitoring System(CMS) to monitor important machinesystems

■ the Computerized Monitoring Systemis self-diagnosing and easy tounderstand. It provides informationmodes to quickly localize mechanicalor electrical problems

Track Roller Frames

Features

■ roller frames use pinned equalizer barand pivot shafts for limited oscillation

■ equalizer bar is pinned to each rollerframe and center of main frame tomaintain a stable working platform

■ rubber pads between equalizer barand main frame dampen shocks

■ roller frames are box-section withfull-length welds

Steering

Features

■ steering controlled by foot pedals ■ partially depressing left or right pedal

slows that track, causing machine toturn smoothly in that direction withfull power to both tracks

■ full pedal depression causes track tostop, then reverse direction resultingin counter rotation of the machine

■ spot turns within machine length

Service Refill CapacitiesL Gallons

Fuel tank 415 110

Cooling system 51 13.5

Crankcase 28 7.3

Powertrain system 38 10.1

Final drives (each) 29 7.5

Hydraulic system(including tank) 159 42

Hydraulic tank 60 15.8

Pump-drive gear box 3.8 1.0

Electrical

Features

■ wiring harnesses wrapped withbraided, vinyl-coated nylon shieldingfor maximum protection

■ connectors are self-sealing, yet stillprovide easy service access

■ 24 to 12 volt radio converter standard■ key start and stop■ color coded wires for improved

serviceability

Attachments

General purpose bucket

■ high-strength, low-alloy steel platefor resistance to dents and abrasions

■ shell tine assembly in bucket floorfor increased structural strength

■ can be equipped with the followingsystems: edge protection, bolt-on teethwith Corner Guard System, bolt-onreversible cutting-edge group, orbolt-on teeth and edge segments

■ also available with welded-on teethwhich are flush mounted to thecutting edge

Multi-purpose bucket

■ loads, strips topsoil, bulldozes andcleans up debris

■ bucket clamps hydraulically to griplogs or handle other tough-to-graspmaterials

■ options: teeth with Corner GuardSystem bolt-on reversible cutting-edge group, or bolt-on teeth andedge segments

Rock bucket

■ designed for toughest applications■ additional steel provides added life■ V-shaped cutting edge for improved

penetration■ weld-on tooth adaptors accommodate

long or short teeth

Ripper-Scarifier

■ hinged-type with three-shank beammounted with two pins pressed intoeach side of main frame

■ raised and lowered with twowide-mounted cylinders

■ six-pin linkage requires no lubrication

16 973C Track Loader specifications

Rated bucket capacity §(Nominal heaped)

Struck capacity §

Bucket width*

Dump clearance at full lift and 45° discharge §

Reach at 45° discharge angleand 2133 mm (7'0") clearance §

Reach at full lift and 45° discharge

Digging depth §

Overall machine length

Overall machine height with bucket at full raise

Static tipping load

Breakout force**

Operating weight***

2.8 3.2 3.2 2.8 2.6 2.9 2.93.75 4.2 4.2 3.75 3.4 3.8 3.8

2.41 2.77 2.77 2.46 2.19 2.56 2.563.16 3.62 3.62 3.21 2.87 3.34 3.34

2854 2854 2854 2705 2710 2710 2710112 112 112 106.5 107 107 107

3340 3266 3266 3014 3044 2965 2965131 129 129 118 119 117 117

2006 2029 2029 2023 1859 1861 186179 80 80 80 73 73 73

1329 1375 1375 1464 1287 1324 132452 54 54 57 50 52 52

118 148 148 118 211 241 2414.6 5.8 5.8 4.6 8.3 9.5 9.5

7078 7362 7182 7569 7337 7619 7439279 290 283 298 289 300 293

5785 5785 5785 5726 5894 5894 5894228 228 228 225 232 232 232

19 774 19 272 19 471 19 541 18 647 18 167 18 34443,602 42,495 42,934 43,088 41,117 40,058 40,449

215.6 196.6 198.0 183.2 175.8 161.4 162.848,510 44,188 44,507 41,223 39,555 36,281 36,591

26 648 27 006 26 864 26 877 27 758 28 100 27 96258,759 59,548 59,235 59,264 61,206 61,961 61,656

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kNlb

kglb

General purposebucket

Multi-purposebucket

Rock

Bare

Bolt-onteeth &

segments

Bolt-onteeth &

segments

Bolt-oncuttingedge

Weld-onflush teeth Bare

Bolt-oncuttingedge

* Bucket width with bolt-on cutting edge add 17 mm (.67"). For bolt-on teeth add 52 mm (2.0").** Measured 100 mm (3.94") behind tip of cutting edge with bucket hinge pin as pivot point.

*** Includes coolant, lubricants, full fuel tank, ROPS cab, bucket and 80 kg/176 lb operator.

§ Specifications and ratings conform to all applicable standards recommended by the Society of Automotive Engineers. SAE Standard J732 FEB80 and SAE Standard J742 OCT79 govern loader ratings.

ROPS canopy (cab removed) -149 kg -329 lb -175 kg -386 lb

Ripper with 3 shanks (bumper removed) +971 kg +2,141 lb +2257 kg +4,977 lb

Air conditioner +95 kg +209 lb +160 kg +353 lb

Wide track shoes, 675 mm (26.6") +632 kg +1,394 lb +476 kg +1,050 lb

Change InOperating Weight

Change In StaticTipping Load

NOTE: Machine stability can be affected by the addition of other attachments. Add or subtract to/from machine operating weight and statictipping load.

Operating Specifications

17973C Track Loader specifications

Overall machine width without bucket:

with standard track – 500 mm (19.7" shoes) 2580 mm (102")

with wide track – 675 mm (26.6" shoes) 2755 mm (108")

Ground clearance from face of shoe 456 mm (17.9")

Grading angle 69°

1 Machine height to top of cab 3450 mm (136")

2 Length to front of track 5163 mm (203")

3 Overall machine length ◆4 Carry position approach angle 15°

5 Digging depth ◆6 Maximum rollback at ground GP 43°/MP 46°

7 Maximum rollback at carry position GP 50°/MP 52°

8 Bucket in carry position —

9 Reach at full lift height ◆10 S.A.E. specified dump angle 45° (46° max.)

11 Maximum rollback, fully raised 59°

12 Dump clearance at full lift height and 45° discharge ◆13 Height to bucket hinge pin 4220 mm (166")

14 Overall machine height, bucket fully raised ◆15 Height to top of seat with headrest 2701 mm (106")

◆ Dimensions vary with bucket. Refer to Operation Specifications chart on page 16.

GP = General Purpose Bucket

MP = Multi-Purpose Bucket

DimensionsAll dimensions are subject to change without notice.

109

81

2

3

4

5

6

7

15

11

12

13

14

18 973C Track Loader specifications

Alarm, back-upAlternator (24-volt, 70-amp)Armrests, adjustableAshtray, cigarette lighter (24V)Batteries, high-output, maintenance free,

925CCABlower fanBucket positioner, automaticBumper, rearCab, sound suppressed with tinted glass,

air pressurization, Rollover ProtectiveStructure (ROPS) and Falling ObjectsProtective Structure (FOPS)

Coat hookComputerized Monitoring System

(CMS)Controls (for equipment), single lever

control, two-valve hydraulic, pilotoperated

Coolant: extended life coolantCooler, oil equipmentCrankcase guard, fullElectronic Hydrostatic Control (EHC)Engine: Caterpillar 3306TA Diesel

Engine, direct injection, turbochargedand aftercooled, net 210 hp

Engine air filter, radial seal

Engine enclosure with lockable doors Fuel priming pumpGauge package for:

– fuel level– engine coolant temperature– hydraulic oil temperature– Power train oil temperature

Heater/defroster with temperaturecontrol (also standard on canopymachines)

Hitch, front retrieval HornKey startLift kickout, automaticLights (2), ROPS mounted, forward

facing (halogen)Mirror, rearview, insideMufflerOperator panel, including:

Computerized Monitoring System and hydrostatic information/hour meter display

Pedal steeringPre-cleaner, air intake Radiator guard, HD, perforated Radio installation arrangement for

12-volt radio, with speakers (2)

Seat, fabric-covered Cat ContourSeries, suspended and adjustable

Seat belt, retractableSpeed mode switchSprocket guardsSprocket rims, segmented Starting motor, 24-volt electricStorage compartments under armrests

(lockable on right armrest)Track, Caterpillar sealed and lubricated

(40 section)Track adjuster, hydraulicTrack guiding guards, end sectionTrack idlers, lifetime lubricatedTrack rollers (7), lifetime lubricated Track shoes, 500 mm (19.7"), double-

bar grouser Vandalism protection:

Consists of lockable fuel tank capwith padlock, three padlocks to lockfront service doors and radiator capaccess door, and a ball valve todisconnect the control lever (seeadditional items included in canopy)

Windshield and back window washersand wipers (variable intermittentfront wiper)

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

19973C Track Loader specifications

kg lb

Air conditioner 95 209

Antifreeze (for temperatures below -34° F/-37° C down to -58° F/-50° C) 0 0

Buckets:General purpose 2.8 m3 (3.75 yd3) 1719 3,790

General purpose with weld-on flush-mounted adapters 2.8 m3 (3.75 yd3) 1895 4,177

Multi-purpose 2.6 m3 (3.4 yd3) 2929 6,237

Bucket cutting edge, reversible, sharpened, bolt-on:

G.P. bucket 215 475

M.P. bucket 204 449

Bucket teeth, 8 bolt-on (includescorner teeth)

Long 223 492

Short 219 482

Bucket edge segments, bolt-on 122 270

Canopy, ROPS (cab removed), includes rearview mirror, 2 forward facing lights, heater, vinyl seat and vandalism protection consisting of cab vandalism package plus instrument panel guard group with padlock -221 -487

Drawbar hitch 30 67

Guards, track roller 289 638

Guards, idler 121 267

kg lb

Controls (for equipment hydraulic system)

Two-lever control 0 0

3rd valve with or without lines for frontand rear attachments 76 168

Diverter valve for use when both frontand rear lines are required 69 152

Low maintenance, high output,heavy duty batteries 25 55

Lighting systems (halogen):

Four lights (machine-mounted,2 forward, 2 rear) 13 28

Ripper-scarifier (with three ripper shanks)bumper removed 971 2141

Track shoes – 675 mm (26.6")double grouser 632 1394

Optional EquipmentWith approximate changes in operating weights.

973C Track Loader

AEHQ5369 (04-00)(Replaces AEHQ3843)

Featured machines may include additional equipment only for special applications.

See your authorized Caterpillar Dealer for available options.

Materials and specifications are subject to change without notice.

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