TM 9-1710C ( Ordnance Maintenance Chassis and Body for Half.pdf

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T E C H N I C L D T T 9 1 7 1 CU.S. ARMY MILITARY H ISTORY INSTITUTECARLISLE BARRACKS. PA 17O13 5O08

WAR DEPARTMENTTECHNIC L M NU L

ORDNANCE MAINTENANCECHASSIS A N D B O D Y

F O R H A L F T R A C K V E H I C L E SSEPTEMBER 11, 1942

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TM 9-1710CC

D EP A R TM E N T O P T HEARMY T E CHN ICAL MANU ALORDNANCE MAINTENANCE: CHASSIS A N D BO D Y FOR HALF-TRACK VEHICLES

CHANG ES DEPARTMENT OF THE A R M YN o. 1 | W ASHINGTON 25, D . C., 28 May 1953TM 9-1T10C, 11 September1942, ischanged as follows:27 Wheel Brakes

e . Maintenance ndadjustments(9) Service data* # * * *Brake drum

Regrinding limits.__________________ 0.125 in.[ A G 300.7 (28 Apr 53)]

BY ORDER O F THE SECRETARYO F THE ARMY

OFFICIAL: J. LAWTON COLLINSW M . E. B E R G I N Chief ofStaff United StatesArmyMajor General USATheAdjutant General

DISTR IBU T IONActive ArmyTech Svc 1); Tech S vc Bd 2); AFF 3); AA C om d 2);OS M aj C om d 5); B ase Comd 2); MDW 3); LogC om d 5); A 5); CHQ 2); Div 2); Regt 9 2); Bn

9 2); CO 9 2);FT 2); Sch 5) except 9 50); PMS T9 (1) ; G e n Dep 2); Dep 9 10); POE 5), OSD 2);PEGR 9 10); Ars 9 10); Proc Dist 9 10); MilDist 3).NG: Same as Active Army except one copy to each unit.Army Reserve: S am eas ActiveArmy except onecopy to each

unit.For explanation ofdistribution formula, seeS E, 310-90-1.

T A G O 4099BM a y 49653


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T E C H N IC A L M A N U A L W A R D E P R T M E N T N o . 9 17 1 0 C [ W ashingto n September 1 1 1942

ORDN NCE M INTEN NCECH SSIS AND BODY FOR HALFTRACK VEHICLES

Preparedunder thedirection of theChief of Ordnance

SECT ION I

IIIIV.V

VI.VII.VIII.

IX.X.

XI.XII.XIII.

CONTENTS

IntroductionService maintenanceTechnical inspectionBody and sheet metalBogie suspension and trackBrake systemsCooling systemElectrical lighting system,

teries, and accessoriesFrameFuel systemInstruments and gages

Paragraphs1- 34- 67- 9

10-1213-1920-2930-33

bat-34-4041-4445-4950-54

Frontsprings and shock absorbers 55 56Steering gear anddrag link 57-63

Pages

3- 56- 910- 435- 7576-158159-170

171-212213-225226-238239-259260-270271-291

XIV, Consolidated servicedata fits andclearances 64-69 292-293

XV. Preparation of units for extremetemperatures or unusual conditions 70-73 294-297

XVI. References 74-76 298-299INDEX 300-308


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TM 9 1710C1 3ORDNANCE MAINTENANCE CHASSIS AND BODY FOR

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Section I

INTRODUCTIONParagraph

Purpose .............................................. 1Scope of information..................................... 2References ............................................ 31. PURPOSE.

This technical manual is published for the information and guidanceof ordnance maintenance personnel and is the third of a series of threemaintenance publications provided for the subject vehicles.2. S C O P E O F I N F O R M A T I O N .

a. Vehicle. Information concerning the service maintenance, technical inspection, and lubrication of the entire vehicle will be foundin'TM 9-710.b. Chassis and Body. Information is included in this manual concerning the detailed description, operation, inspection and trouble diagnosis, disassembly, maintenance and repair, assembly, and test of majorcomponents of the chassis (exclusive of power train and power plant)and body, supplementing TM 9-710 prepared for the using arm.

c. Power Train. For maintenance information concerning the powertrain, refer to TM 9-1710.

d. Power Plant. For maintenance information concerning the powerplant and its accessories, refer to TM 9-1711.3. R E F E R E N C E S .

A H pertinent standard nomenclature lists, technical manuals, andother publications having reference to the materiel described herein,are listed in section XIII.


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TM9 1710C46

Section II

SERVI EMINTENNEParagraph

Objective 4ScopeAllocationof repair jobs. 64 OBJECTIVE

There is a distinctdifferencebetween the missions of organizationalmaintenance andof service maintenance. Organizational maintenanceby the using arms has for its prime objective the routine preventivemaintenance care and adjustmentof vehicles so that theywill be ingood operating conditionat all times with a minimum loss of elapsedtime for repairs. Servicemaintenanceby lightandheavymaintenanceorganizations of the Quartermaster Corps and Ordnance Departmenthas for itsprime objectives,supply, technical inspectionand correctiveaction, andrepairsbeyond the capacity of the usingarmseither byunitreplacement,overhauling, rebuilding, reclaiming, manufacturing, orany other methods consideredmost suitable.5 SCOPE

The scope of maintenance and repairs by maintenance personnel is determinedby theeasewith whichthe projectcanbeaccomplished, theamount of time available, weather conditions, concealment, shelter,proximityto hostile fire equipment,tools andparts available, andskillof thepersonnel. Since all of these factors arevariable, noexact systemor procedurecanbeprescribedorfollowed.6 ALLOCATION OF REPAIR JOBS

The operations herein augment those which may be performed bypersonnel of the using arms.a Front and Rear Axles.

See TM 9-1710).b Body

Body eplaceBody plates and supports. Repair, replace, or rebuildSeats epair or rebuildSheetmetal Repair, weld or rebuildTops. Repair,weld or rebuildUpholstering Repair or replaceWindshields RepairWindshield wpers Repair or rebuild


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c BogieSprockets epairBogie wheels.....................................RepairHubs epairTrack supporting roller assemblies. RepairAxle tube suspension RepairIdlers epairAxle tube suspension........Repair, weld, machine, and alineBrackets, rear suspension..... Repair, weld, machine, and alineTrack adjustingmechanism RebuildBogie components.................Machine, weld, and aline

d BrakesBrake cylinders Repair and honeBrake shoes......................................RelineBrake vacuum booster............ Adjust, repair, and rebuild

e Cooling SystemFan epairFan bearings ReplaceRadiator epair

f Electrical Generating and Starting System(See TM 9-1711.)

g Electrical Ignition System(See TM 9-1711.)

h Electrical Lighting System and AccessoriesBattery epairHeater epairHorn : epairLights Repair

i Engine(SeeTM 9-1711.)

j FrameFrame...............................Repair or straightenPintle epairRoller..................................Replace or repair

k Fuel SystemFuel gage components RepairFuel tanks.......................................Repair


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I InstrumentsCluster RepairMeters Repair

in Propeller ShaftsSee TM 9-1710).

II Springs and Shock AbsorbersAbsorbers epairSprings epair or rebuild

o Steering GearDrag link RepairSteering gear Repair or rebuild

p ransmission ransfer CaseSee TM 9-1710).

q WheelsLine casings and tube RepairWheels Repair, weld,machine, and aline


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TM 9 1710C7 9ORDNANCE MAINTENANCE CHASSIS AND BODY FOR

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Section III

TECHNICAL INSPECTIONParagraph

Description ............................................ 7Inspection form ........................................ 8Practical application .................................... 97. DE SC R I P T I ON.

Technical inspections are a follow-up and check on organizationalmaintenance inspections and other maintenance functions, and determine whether the vehicle should be continued in service or withdrawnfrom operation for overhaul. These inspections are covered in AR 850-15.8. IN S PE C T ION FORM.War Department Quartermaster Corps Form No. 260, TechnicalInspection Report of Motor Vehicles, is the standard and official formfor recording the inspection of all motor vehicles, including combatvehicles of the Ordnance Department. The extent to which use is madeof this form or modifications thereof depends entirely on the technicalability of available personnel, the time factor, and the test and shopequipment available.9. PR A C T IC A L A PPL IC A T ION .

a. External Inspection of Body and Frame Components.(1) BUMPERS. Examine for straightness; use wrench to test channelbolts for tightness; inspect brackets for breaks.(2) Tow HOOKS. Inspect for straightness and fractures; use wrenchto test mounting bolts for tightness.(3) FR O N T ROLLER. Check freedom of rotation; inspect springs andsupporting brackets for breaks.(4) R ADI ATOR SHUTTERS. Inspect for breaks in armor plate and loosescrews; open right door and operate louver lever to check opening andclosing of shutters.(5) RADIATOR. Examine underneath for leaks; inspect front of corefor plugged air passages.(6) HEADLIGHT GUARDS. Shake to determine looseness; inspect forbreaks and fractures.

(7) TIRES. Inspect for serviceability; examine for indications ofimproper inflation or use, cuts, blisters, breaks, uneven wear, etc.; recorddefects for each tire.8) H O O D . Inspect for breaks in armor plate and loose screws; exam-


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TM 9 1710C9

TECHNICAL INSPECTION

ine fasteners and hinges; inspect lacings for breaks;open and shut tocheck for fit.(9) RUNNING B O A R D S A N D FENDERS . Examine for cracks and dents;shake up and down to test for looseness; use wrench to test mountingbolts for tightness; inspect support brackets for breaks.

(10) D O O R S . Open and close to test for fit; shake up and downwhile open to test for loose hinges; turn handles and check locks andlatches; inspect for loose and missing screws; check operation andsecurement of observation slot covers.

(11) GL A SS. Inspect windshields for cracks and fit; check mountingdetails; examine for leaks and defective seals.(12) B ODY . Inspect for breaks in armor plate and loose screws;examine under side for bentor broken frame, angles, battens and welds;check for loosened floor plates, and check securement of grab handles.

(13) PAINT . Inspect for chipped paint, rust spots, scratches, brightmetal, gloss, peelings, and cracks.

(14) T O P A N D CURTAINS. Inspect for breaks in material and indications of leaks; examinestraps and keepers.

(15) P IN TLE . Inspect towing device for securement; examine latcheffectiveness; check operation; test tightness of pintle hook retainingnut with wrench.

(16) LIGH TS. Inspect for broken glass and reflectors; check wireconnections;test tightness of head lamp mountingstud nuts with wrench;check securement of tail lamps, turn on lights, and check all bulbs fordifferent positions of light switch; be sure to turn off lights.

(17) AMMU N I T I ON RACKS . Check covers; inspect shelves.(18) B A T T E R Y A N D C O M P A RT M ENT . Remove top housing plate; check

level and specific gravity of electrolyte in each cell; check voltage dropacross cells with tong tester; examine terminals for looseness and corrosion; inspect cables and ground straps; check vents and tighten plugs.

b External Inspection of Chassis Components(1) W H E E L S . Check all wheel nuts with wrench; check lubrication

of bearings.(2) SPRINGS. Inspect for broken leaves, loose clips, worn ordamaged

shackles, and misalinement; check shackle lubrication; testall shacklebolts with wrench; use pry bar to check flexing of springs.

(3) S H O C K ABSORBERS . Check fluid level; examine linkage; inspectsecurement and lubrication.(4) F R AME . Inspect frame side rails and cross members for distortion and fractures; examine front end for evidence of stress due tooverhang of loads; inspect all rivets and especially those for the rollerbrackets, spring brackets, engine supports, and steering gear bracket;examine battery tray support rivets for corrosion.

(5) STEERING G E A R H O U S ING. Test all nuts with wrench. Whilesome-


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one turns steering wheel, observe housing for leaks, shimmy or looseness.Check lubrication.(6) S T E E R I N G G E A R LINKAGE. Inspect drag link for straightness;check lubrication and presence of boots; test all nuts with wrench.(7) B R A K E LINKAGE. Check all clevis pins for lubrication, presenceof cotter pins, and looseness; inspect rods for straightness, cracks, rustand corrosion.(8) B R A K E LINES. Check for leaks, breaks, and loose connections;examine flexible tubing for cracks.(9) V AC UUM B O O S TE R . Examine linkage and securement.(10) F U E L LINES. Check for leaks, breaks, and loose connections.

c. Engine Compartment Engine Stopped).(1) RADI AT O R. Examine for leaks, rust, corrosion, and clear airpassages; shake to observe if it is 'loose in the frame; tighten all studnuts with wrench; check clearance of fan blades; check vent; check forpresence of radiator cap and proper water level; test antifreeze solutionwith suitable hydrometer.(2) FAN. Inspect blades for breaks, looseness, and proper pitch; shaketo test for looseness and worn bearings.(3) F A N B E L T . Inspect for matching of belts and play; examine forfraying, tears, and presence of grease or oil; check alinement of pulleys.(4) SHRO UD. Inspect for fit and securement; check clearance of fanblades; tighten screws.

d. Interior Inspection Engine Started).(1) SWITCHES. Check operation; examine securement; inspect wiring.(2) M E T E R S . Check operation; examine securement; inspect: connections.(3) GAGES. Check operation; examine securement; inspect connections; feel tachometer and speedometer cables for excessive heat andvibration.(4) W I N D S H I E L D W I P E R S . Check operation.(5) P A N E L LIGHTS . Check operation.(6) HO RN. Check operation.(7) F I R E EXTINGUISHER. Check securement; inspect for full charge.(8) C H O K E AND V ENTILATOR CONTROLS. Check free operation andnote a movement of ventilator slides; have an assistant note movementof choke valve in carburetor.(9) ACCELERATOR. Check for proper alinement and operation.(10) PEDALS. Check for proper operation.(11) B R A K E FL UI D . Remove floor cover in front of driver's seat andinspect master cylinder; examine fluid; check securement and connections.

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(12 ) L O U V E R CO N T ROL L E V E R. Operate lever to checkmovement andposition of radiator shutters.(13) S E A T S . Inspect for breaks, damaged brackets, and upholstery.(14) G U N R A IL P AD S. Inspect.(15) G U N R AIL. Inspect for breaks, cracks andrust; examine secure-ment aroundentire circumference, and operate gun carriage aroundeachcorner to check alinement.(16) T O P Bows. Inspect bows for breaks and securement.

e Engine Compartment Engine Running).(1) F U E L L E A K S. Inspect fuel lines for leaks.(2) O IL L E A KS . Inspect under vehiclefor evidence of oil drippings.(3) W AT E R LEAKS. Inspecthose connectionsto radiator, water pump,and heater for leaks; feel hose for condition of fabricand flow of fluid;examine radiator for leaks.(4) WIRING. Inspect wires around engine and along frame; tug on

wires to check forloose connections evidencedby sparking; examineterminal board connections.(5) V O L T A G E R E G U L A T OR. Disconnect lead to battery anduse voltmeter to check for correct cut-out andopen-circuit voltages.f. Road Test.(1) B O D Y NOI S ES. Listen for any unusual body noises, squeaks,orrattles, andidentify location and cause.(2) D R IVE SHAFT B R A K E . Test by pulling on hand brake lever andgently engaging clutch to stall the engine; note any unusual noises or

signs of loose parts; donot attempt to stop rollingvehicle with this brake.(3) S E R V I C E B R A K E S . Test byapplying pressure to foot pedal andobserving results, including tendencyof vehicle toswerve or stall.(4) SPEEDO M E T E R AN D T AC H O M E T E R C A B L E S . Observe instruments

to note registering. Feel cable;if hot, internal friction is developingbecauseof improper adjustment or lack of lubricant; ifa slight clickor thump is heard, the cable should beremoved and inspected for distortion, incorrect length or diameter, and breaks.(5) ST E ERING M E C H AN IS M . Note whether steering wheel hasa tendency to jerk; such action indicates a looseness in the steering mechanism from the front axle to thewheel, or an error insteering geometry.Note any tendency on the part of the vehicle to wander or driveto therightor left, indicating improperadjustment or an errorin steering geargeometry. If a thump or knockingis felt in the steering wheel, a partis probablyloose in the steering gear worm.

g Inspection of Other Components See TM 9-1710, PowerTrain, and TM 9-1711, White, 160AXEngine.


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Section VBODY ND SHEET METAL

aragraphBody ................................................ 10Sheet metal ........................................... 11Windshieldwipers ..................................... 1210 ODY (figs. 1 through 11).A ll half-track vehicle bodies are made of Vi-inch thick armor platewith the exception of the windshield plate and the door shield slidingplates, which are V a inch thick. The plates are bolted to the bodyframework with oval-head screws and self-locking nuts. The entire bodyassembly is bolted to the chassis frame assembly. The floor plates aremade of checkered aluminumor steel and are either bolted to the bodyframework or hinged wherever they serve as compartment covers. Thefundamental differences in the bodies of the vehicles are explained inSection II, TM 9-710 .

a Disassembly(1) The side doors, door shields, windshield plate, side and top hood

plates, the rear door on the CarrierM3, and the ammunition rack doorson the Car M 2 are all, hinged andare removed by removing the oval-head screws or bolts and self-locking nuts with which the hinges arebolted to these units. A n air wrench is usually necessary to removetheself-locking nuts.(2) The hinged floor plates are removed by removing the cap screwsand nuts holding the plates to the hinges.

(3) The remainder of the body plates are disassembled by removingthe holding screws and nuts.

b Maintenance(1) All damaged bolts and screws should be replaced as soon as itis practicable.(2) Bent armor plates should be removed, and straightened by cold

bending. Do not attempt to use heat for straightening, as this willdestroy the liardness of the plates and their ability to resist gunfire.

(3) Plates which are pierced by shells should be replaced with newplates. If this is not possible, temporary repairs can be made by boltinga section of plate over the shell hole. Plates can be repaired by weldingaccording to procedures outlined in TB-1 8 52 -1 .

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Figure4Body Front View Car Half-Track M214

RA PD 3750


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BODY AND SHEET METAL

W

RA P 54068

Figure5-Body R ear View Car Half-T rack M215


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Figure6ABody Plan View Car Half-Track l6


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BODYAND SH TMETAL

X-figure

RA PD J474C6B-Body PlanView Nomenclature Car Half-Track M2

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ORDNANCE MAINTENANCE CHASSIS AND BODY FORHALF TRACK VEHICLES

R PD 35 9

Figure 7Body Rearfloor Frame Assembly Car Half-Track M2(4)Replace damaged door lock springs and anyother worn or

damaged lock parts fig. 12).

11 SH T METALa. Fenders(1) D E S C R IPTION fig. 13). The front wheel fenders are made of

pressedsteel. The outside edges are turnedover to form a bead forreinforcing purposes and to prevent tearing. Each fender has twosupports which are welded tothe fenderat their outer edges. The frontsupport is bolted to the frame, andthe rear support is bolted to theengine rear sidearmor plate.The fenders are also boltedtothebody,engine side plates, and running boards. Thehead lamps and brushguards are bolted to the top front of thefenders. The head lamp andblackout marker lampwiresare pulled through grommets locatedinthefenders.Four strapfastenersare attached to each fender, and thestraps whichholdthe canvas top bag are run through these fasteners.

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R PD54 69

Figure8Body RearView Carrier Personnel Half-Track M3

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TM 9-1710C ( Ordnance Maintenance Chassis and Body for Half.pdf