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TM 9-2320-285-24PTECHNICAL MANUALUNIT, DIRECT SUPPORT, AND GENERAL SUPPORTMAINTENANCE REPAIR PARTS ANDSPECIAL TOOLS LISTSTRUCK TRACTOR, YARD-TYPE:43,500 LB GVW, DED, 4 X 2ARMY MODEL M878A1(OTTAWA MODEL 50)(NSN 2320-01-121-2102)This manual supersedes TM 9-2320-285-24P, 16 October 1985.Approved for public release, distribution is unlimitedHEADQUARTERS, DEPARTMENT OF THE ARMYJUNE 1992

TECHNICAL MANUALHEADQUARTERSDEPARTMENT OF THE ARMYWashington D.C., 5 June 1992*TM 9-2320-285-24PUNIT, DIRECT SUPPORT, AND GENERAL SUPPORTMAINTENANCE REPAIR PARTS ANDSPECIAL TOOLS LISTSTRUCK TRACTOR, YARD-TYPE:43,500 LB GVW, DED, 4 X 2ARMY MODEL M878A1(OTTAWA MODEL 50)(NSN 2320-01-121-2102)Current as of 22 November 1991REPORTING ERRORS AND RECOMMENDING IMPROVEMENTSYou can help improve this manual. If you find any mistakes or if youknow of a way to improve the procedures, please let us know. Mail yourletter, DA Form 2028 (Recommended Changes to Publications andBlank Forms), or DA Form 2028-2, located in the back of this manual,direct to: Commander, U.S. Army Tank-Automotive Command, ATTN:AMSTA-MB, Warren, MI 48397-5000. A reply will be furnished to you.Approved for public release; distribution Is unlimited.TABLE OF CONTENTSSECTION I.SECTION II.PageINTRODUCTION .1REPAIR PARTS LIST. 1-1GROUP 01ENGINE0100 - ENGINE ASSEMBLY.ENGINE MOUNTING.0106 - ENGINE LUBRICATION SYSTEM .OIL SAMPLING KIT.EXTERNAL OIL FILTER.OIL FILTER ASSEMBLY.GROUP 031-11-12-12-13-14-1IllusFig1234FUEL SYSTEM0304 - AIR CLEANER .AIR CLEANER.0306 - TANKS, LINES, FITTINGS, HEADERS .FUEL TANK .0309 - FUEL FILTERS .FUEL FILTER AND STRAINER.0311 - ENGINE STARTING AIDS .ETHER STARTING KIT.* This manual supersedes TM 9-2320-285-24P, dated 16 October 1985.5-15-16-16-17-17-18-18-15678

TM 9-2320-285-24PTABLE OF CONTENTS (Con't)GROUP 04PageIllusFig0312 - ACCELERATOR, THROTTLE, OR CHOKE CONTROLS . 9-1ACCELERATOR LINKAGE. 9-1ACCELERATOR PEDAL . 10-1910EXHAUST SYSTEM0401 - MUFFLER AND PIPES. 11-1VERTICAL MUFFLER. 11-1EXHAUST OUTLET. 12-1GROUP 05COOLING SYSTEM0501 - RADIATOR, EVAPORATIVE COOLER, OR HEAT EXCHANGER.RADIATOR ASSEMBLY .RADIATOR ATTACHING HARDWARE.0502 - COWLING, DEFLECTORS, AIR DUCTS, SHROUDS, ETC .FAN SHROUD .0503 - WATER MANIFOLD, HEADERS, THERMOSTATS, AND HOUSING GASKET.RADIATOR HOSES .COOLANT FILTER INSTA LLATION.0505 - FAN ASSEMBLY .FAN CLUTCH ASSEMBLY .FAN CLUTCH CONTROL SYSTEM .GROUP 13141516171819ELECTRICAL SYSTEM0601 - GENERATOR, ALTERNATOR.ALTERNATOR INSTALLATION .ALTERNATOR.0603 - STARTING MOTOR .STARTER.70 AMP BREAKER AND SOLENOID.0607 - INSTRUMENT OR ENGINE CONTROL PANEL.INSTRUMENT PANEL.0608 - MISCELLANEOUS ITEMS.24-VOLT INVERTER AND WIRING.TURN SIGNAL SWITCHES .KYSOR WARNING, MISCELLANEOUS .WATER LEVEL WARNING KIT INSTALLATION.WATER LEVEL WARNING KIT.0609 - LIGHTS .CAB DOMELIGHT.FRONT AND REAR FLOODLIGHTS .HEADLIGHT ASSEMBLY .CLEARANCE LIGHTS .FRONT TURN LIGHTS.TAILLIGHTS .SEPARATE LIGHTING CABLE .TRAILER CONNECTION INSTALLATION .0610 - SENDING UNITS AND WARNING SWITCHES.WATER TEMPERATURE SENDER.FUEL LEVEL SENDER.THERMAL SWITCH 940

TM 9-2320-285-24PTABLE OF CONTENTS (Con't)0611 - HORN SIREN.HORN BUTTON ASSEMBLY .HORN AND RELAY.0612 - BATTERIES STORAGE.BATTERY .0613 - HULL OR CHASSIS WIRING HARNESS .WIRING HARNESS.GROUP 6566FRONT AXLE1000 - FRONT AXLE ASSEMBLY. 67-1FRONT AXLE ASSEMBLY . 67-1FRONT AXLE HUB AND DRUM. 68-1GROUP 114142PROPELLER, PROPELLER SHAFTS, UNIVERSAL JOINTS, COUPLER, AND CLAMP ASSEMBLY0900 - PROPELLER SHAFTS . 66-1DRIVE SHAFT. 66-1GROUP 10IllusFigTRANSMISSION0708 - TORQUE CONVERTER OR FLUID COUPLING.TRANSMISSION.0710 - TRANSMISSION ASSEMBLY AND ASSOCIATED PARTS .CABLE AND MODULATION ASSEMBLY .TRANSMISSION AND RELATED PARTS.TRANSMISSION MOUNT ASSEMBLY .GEARSHIFT.HOUSING, OIL FILTER, AND OIL PAN.SHIFT LOCKOUT.GEAR UNIT AND MAIN SHAFT.LOW CLUTCH, PLANETARY, AND ADAPTER HOUSING.SHIFT LOCKOUT AND TRACTOR BRAKE .0713 - INTERMEDIATE CLUTCH.FORWARD CLUTCH AND TURBINE SHAFT.FOURTH CLUTCH .THIRD CLUTCH, CENTER SUPPORT, AND SECOND CLUTCH.FIRST CLUTCH .0714 - SERVO UNIT.CONTROL VALVE .REAR COVER .MODULATED LOCKUP VALVE .LOW SHIFT VALVE .0721 - COOLERS, PUMPS, MOTORS .EXTERNAL OIL FILTER INSTALLATION .OIL PUMP AND FRONT SUPPORT.TRANSMISSION OIL SAMPLING VALVE.GROUP 09Page41-141-142-143-143-144-144-16768REAR AXLE1100 - REAR AXLE ASSEMBLY.DRIVE AXLE GROUP INSTALLATION.DRIVE AXLE ASSEMBLY.1102 - DIFFERENTIAL.DIFFERENTIAL CARRIER ASSEMBLY.iii69-169-170-171-171-1697071

TM 9-2320-285-24PTABLE OF CONTENTS (Con't)PageGROUP 12BRAKES1202 - SERVICE BRAKES .FRONT AXLE BRAKES.REAR AXLE BRAKES .1208 - AIRBRAKE SYSTEM.BRAKE AIR CHAMBER.REAR AXLE BRAKE AIR CHAMBER .TRACTOR BRAKES.AIR TANK INSTALLATION .AUTOMATIC DRAIN VALVE.QUICK-RELEASE VALVE .RELAY VALVE.TREADLE VALVE ASSEMBLY .LOW AIR PRESSURE SWITCH.AIR CONTROL VALVE.RATIO REDUCING VALVE.1209 - AIR COMPRESSOR ASSEMBLY .AIR COMPRESSOR GOVERNOR .AIR COMPRESSOR.AIR STRAINER.ALCOHOL EVAPORATOR .1211 - TRAILER BRAKE CONNECTIONS AND CONTROLS .TRACTOR PROTECTION VALVE .TRAILER BRAKE HOSES .HOSE TENDER .TRAILER HANDBRAKE CONTROL INSTALLATION.TRAILER HANDBRAKE CONTROL .GROUP EERING1401 - MECHANICAL STEERING GEAR ASSEMBLY . 95-1STEERING . 95-1STEERING COLUMN AND JOINT. 96-1STEERING LINKAGE AND BALL SOCKETS . 97-11407 - POWER STEERING GEAR ASSEMBLY. 98-1STEERING GEAR. 98-11410 - HYDRAULIC PUMP OR FLUID MOTOR ASSEMBLY . 99-1POWER STEERING PUMP . 99-11411 - HOSES, LINES, FITTINGS . 100-1POWER STEERING HYDRAULICS . 100-11413 - TANKS, RESERVOIRS. 101-1POWER STEERING RESERVOIR. 101-1GROUP 157273WHEELS AND TRACKS1313 - TIRES, TUBES, TIRE CHAINS. 94-1WHEELS AND TIRES. 94-1GROUP 14IllusFig9596979899100101FRAME, TOWING ATTACHMENTS, DRAWBARS, AND ARTICULATION SYSTEMS1501 - FRAME ASSEMBLY . 102-1MAIN FRAME . 102-1GRILLE . 103-1HEAT SHIELD INSTALLATION. 104-11503 - PINTLES AND TOWING ATTACHMENTS . 105-1LIFT, TIE-DOWN, AND TOW HOOK INSTALLATION. 105-11504 - SPARE WHEEL CARRIER AND TIRE LOCK . 106-1SPARE TIRE CARRIER. 106-1iv102103104105106

TM 9-2320-285-24PTABLE OF CONTENTS (Con't)GROUP 16PageIllusFig1506 - FIFTH WHEEL . 107-1FIFTH WHEEL. 107-1FIFTH WHEEL ASSEMBLY . 108-1FIFTH WHEEL UNLATCH . 109-1FIFTH WHEEL UNLATCH VALVE. 110-1107108109110SPRINGS AND SHOCK ABSORBERS1601 - SPRINGS . 111-1FRONT AXLE SPRING. 111-11604 - SHOCK ABSORBER EQUIPMENT. 112-1SHOCK ABSORBER INSTALLATION . 112-1GROUP 18112BODY, CAB, HOOD, AND HULL1801 - BODY, CAB, HOOD, AND HULL ASSEMBLIES . 113-1RADIATOR ACCESS PANEL. 113-1GRILLE GUARD INSTALLATION. 114-1MUDFLAP AND DOCK BUMPER INSTALLATION . 115-1REAR CAB GUARD INSTALLATION. 116-1ENGINE COMPARTMENT INSULATION. 117-1REAR PLATFORM INSTALLATION . 118-1CAB AND DECK . 119-1CAB DOOR. 120-1REAR WINDOW GUARD INSTALLATION. 121-1GRILLE . 122-1CAB INSULATION. 123-1CAB HOLD-DOWN INSTALLATION . 124-11802 - FENDERS, RUNNING BOARDS WITH MOUNTING AND ATTACHINGPARTS, OUTRIGGERS, WINDSHIELD, GLASS, ETC. 125-1SIDE STEP. 125-1REAR AND SIDE WINDOWS. 126-11806 - UPHOLSTERY, SEATS, AND CARPETS . 127-1SEAT. 127-1SEAT ASSEMBLY (A) . 128-1SEAT ASSEMBLY (B) . 129-11808 - STOWAGE RACKS, BOXES, STRAPS, CARRYING CASES, CABLE REELS,HOSE REELS, ETC. 130-1TOOLBOX. 130-1GROUP 128129130BODY, CHASSIS, AND HULL ACCESSORY ITEMS2202 - ACCESSORY ITEMS . 131-1SUNVISOR AND INSIDE MIRROR . 131-1WINDSHIELD WIPER. 132-1WINDSHIELD WASHER. 133-1WARNING TRIANGLE AND FIRST AID KIT. 134-1MIRRORS. 135-1AIR HORN . 136-12207 - WINTERIZATION EQUIPMENT. 137-1OIL PAN AND HEATER. 137-1COOLANT HEATER AND JUNCTION BOX. 138-1BATTERY . 139-1CAB HEATER. 140-1v131132133134135136137138139140

TM 9-2320-285-24PTABLE OF CONTENTS (Con't)GROUP 24PageIllusFig2210 - DATA PLATES AND INSTRUCTION HOLDERS . 141-1DECALS . 141-1DECALS AND PLATES . 142-1141142HYDRAULIC AND FLUID SYSTEMS2401 - PUMP AND MOTOR. 143-1POWER TAKE-OFF . 143-1HYDRAULIC PUMP. 144-12402 - MANIFOLD AND/OR CONTROL VALVES . 145-1HYDRAULIC VALVE . 145-1CAB TILT PUMP . 146-12403 - HYDRAULIC CONTROLS AND/OR MANUAL CONTROLS. 147-1FIFTH WHEEL CONTROL. 147-12404 - TILT CYLINDERS AND TILT CRANK . 148-1CAB HOLD-DOWN ASSEMBLY. 148-1CAB TILT CYLINDER. 149-12406 - STRAINERS, FILTERS, LINES, AND FITTINGS, ETC . 150-1FIFTH WHEEL HYDRAULICS. 150-1HYDRAULIC FILTERS . 151-1HYDRAULIC HOSES . 152-12407 - HYDRAULIC CYLINDERS . 153-1PIVOT SHAFT. 153-1HYDRAULIC CYLINDER . 154-12408 - LIQUID TANKS OR RESERVOIRS. 155-1HYDRAULIC RESERVOIR. 155-1GROUP 47147148149150151152153154155156157158REPAIR KITS9401 - REPAIR KITS. KIT-1REPAIR KITS. KIT-1GROUP 95145146GAGES (NONELECTRICAL). WEIGHING AND MEASURING DEVICES4701 - INSTRUMENTS . 156-1SPEEDOMETER. 156-1TACHOMETER. 157-14702 - GAGES, MOUNTINGS, LINES, AND FITTINGS. 158-1AIR GAGE . 158-1GROUP 94143144KITGENERAL USE STANDARDIZED PARTS9501 - BULK MATERIEL.BULK-1BULK MATERIEL.BULK-1SECTION III. SPECIAL TOOLS LIST (NOT APPLICABLE)SECTION IV. CROSS-REFERENCE INDEXESNATIONAL STOCK NUMBER INDEX.PART NUMBER INDEX.FIGURE AND ITEM NUMBER INDEX.viI-1I-28I-99BULK

TM 9-2320-285-24PUNIT, DIRECT SUPPORT, AND GENERAL SUPPORTMAINTENANCE REPAIR PARTS ANDSPECIAL TOOLS LISTSSECTION I. INTRODUCTION1. Scope.This RPSTL lists and authorizes spares and repair parts;special tools; special test, measurement, and diagnosticequipment (TMDE); and other special support equipmentrequired for performance of Unit, Direct Support, andGeneral Support Maintenance of the Yard-Type TruckTractor. It authorizes the requisitioning, Issue, anddisposition of spares, repair parts and special tools asindicated by the source, maintenance and recoverability(SMR) codes.The figure and item number Index lists figure and itemnumbers in alphanumeric sequence and crossreferences NSN, CAGE, and part numbers.3. Explanation of Columns (Sections II and III).a. ITEM NO. (Column (1)). Indicates the numberused to identify items called out in the illustration.b. SMR CODE (Column (2)).The Source,Maintenance, and Recoverability (SMR) code is a ation, maintenance category authorization criteria,and disposition instructions, as shown in the followingbreakout:2. General.In addition to Section I. Introduction, this Repair Partsand Special Tools List is divided into the followingsections:a. Section II. Repair Parts List. A list of sparesand repair parts authorized by this RPSTL for use in theperformance of maintenance. The list also includesparts which must be removed for replacement of theauthorized parts. Parts lists are composed of functionalgroups in ascending alphanumeric sequence, with theparts in each group listed in ascending figure and itemnumber sequence. Bulk materials are listed in itemname sequence. Repair kits are listed separately in theirown functional group within Section II. Repair parts forreparable special tools are also listed in the tion(s)/figure(s).Source Code1st two positionsXXxxxHow you get an item.Maintenance CodexxXXx3d position4th positionWho can install, replace,or use the item.Who can do completerepair* on the item.Recoverability CodexxxxXb. Section III. Special Tools List. A list of specialtools, special TMDE, and other special supportequipment authorized by this RPSTL (as indicated byBasis of Issue (BOI) information in DESCRIPTION ANDUSABLE ON CODE column) for the performance ofmaintenance.5th positionWho determines disposition action onan unserviceable item.*Complete Repair; Maintenance capacity, capability, andauthority to perform all corrective maintenance tasks ofthe "Repair" function in a use/user environment in orderto restore serviceability to a failed item.c. Section IV Cross-reference Indexes. A list, inNational Item Identification Number (NIIN) sequence, ofall National stock numbered items appearing in thelisting, followed by a list in alphanumeric sequence of allpart numbers appearing in the listings. National stocknumbers and part numbers are cross-referenced to eachillustration/figure and item number appearance.(1) Source Code. The source code tells youhow to get an item needed for maintenance, repair, oroverhaul of an end item/equipment. Explanations ofsource codes follows:1

SECTION IITM 9-2320-285-24PTA510001FIGURE 1. ENGINE MOUNTING.