Tm 9-792 M21 AMMUNITION TRAILER

7/28/2019 Tm 9-792 M21 AMMUNITION TRAILER

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LMANUAL

M

P u b l i c D o m a i n ,

G o o g l e - d

i g i t i z e d / h t t p : / / w w w . h a t h i t r u s t . o

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NICALMANUAL

2,dated5August1944.

UARY1945

NOFRESTRICTEDMATTER

irtueofhisgrade orpositiontoknowl-

matter.Suchmatteris entrustedonly

aldutiesrequiresuchknowledgeor

3*,AR380-5,15March1944.)

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r1944

unitionTrailerM21,ispublished

ofall concerned.

)RJ

ARYOFWAR:

GF(10);ASF(2); SDivASF(1);

& SvBd(2);Tech

(OrdO)(5); Dist

O,9(3); Establish-

O,9(3); Gen&

10);CHQ (10);

3);9-7(3);9-9

9-67(3);9-76

(3);9-325(2);

FM21-6.)

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-4

-7

STRUCTIONS

-

n-

NCEINSTRUCTIONS

1

3-2423-27

r-

.32-4040- 46

ius

es,

-58

61-65

7065-81

-7481-84

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andrearprop

-91

d

UIPMENT

CTIONS

8-99

4-96 99-101

es,and

l

5107-110

limitedstorage106-108111-114

-117

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2,datedSAugust1944.

edforthe informationandguid-

ininformationonoperationand

wellasdescriptionsofmajorunits

othercomponentsofthisvehicle.

onTrailerM21and arearranged

on;PartTwo,OperatingInstruc-

nstructions;PartFour,Auxiliary

rInstructions.

manualcontainsinstructions

anda listofreferencesincluding

hnicalmanuals,andotherpublications

chappearthroughoutthe

7,SNLG-213,1November1944.

orusein performingprescribed

riefexplanationsofeach:

0,ARMYMOTORVEHICLE

mwillbe issuedbycommandingoffi-

rganizations,toalloperatorsof

dthedriver'sexamination(TM21-

heparticularvehiclesnotedon

RICATIONORDER.WarDepartment

ribeslubricationmaintenancefor

isissuedwitheachvehicleand

es.

DRIVER'SREPORTACCIDENT,

Onecopyofthisformwillbekeptwith

fanaccidentresultingininjury

ledoutbythe driveronthespot

fter.

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M21FrontView

M27RearView

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M27TopView

Place

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MNo.48,DRIVER'STRIPTICKET

NANCESERVICERECORD.Thisform,prop-

othe driverwhenhisvehicleis

ns.Thedriverandtheofficialuser

ail appropriatepartsofthisform.

orvehiclesinconvoyorontactical

formcontainsthedriver'sdaily

nceservicereminderschedule.

,MWOANDMAJORUNIT

RECORD.Thisform,carriedwiththe

onnelcompletingamodificationor

ttorecordclearlythedescription

hoursand/ormileage,andMWO

ssembly.Personnelperforming

olumnprovided.Minorrepairs,

tswillnotberecorded.

UTYROSTER.Thisform,slightly

lingandmaintaininga recordof

maybe usedforlubrication

,PREVENTIVEMAINTENANCE

NSPECTIONWORKSHEETFORWHEELED

S.Thisformwillbeused forall1,000-mile

annual)maintenanceservicesand

edonwheeledorhalf-trackvehicles.

0,SPOT-CHECKINSPECTION

HICLES.Thisformmaybeusedbyall

ffrepresentativesinmakingspot-

,UNSATISFACTORYEQUIPMENT

forreportingmanufacturing,design,

witha viewtoimprovingand

seinrecommendingmodifications

eusedforreportingfailures,isolated

sofmaterielresultingfromfairwear

rforthe replacement,repair,or

t.Itdoesnotreplacecurrently

mancerecords.

81,EXCHANGEPARTORUNIT

ag,properlyexecuted,maybeused

emsforlike serviceableassemblies,

ndtools.

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11/128

ngsofbothlines,whennot inuse,

tivedummycouplingslocatedon

iler.

tsaremountedattherear

isacombinationblackouttaillight

t. Theright-handlightisa combi-

light.A blackoutswitch,mounted

box,controlsthe taillight.Anelec-

tthelowerr ight-handcornerofthe

mpercable(fig. 6)providesacon-

wingvehicleelectricalsystemsto

s.Thejumpercableplugsintothe

andasimilarsocketonthe towing

00Ib

13,300Ib

ght:

h

5mph

eeye91in.

U-boltatfullload12 %in.

dedlevel position,

centerline of

n.

s.

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e)10x 5%in.

one

ng

Westinghouse220353

ouse215001

house217915

ca

e

ca

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ca

.D.x6s/s-in.O.D.

D965-1-6

topli ghtKD964-1-6

ORIES

nformationonly.Theyare

uisition.

owage

on

E,wheelnutToolbox

ombina-Toolbox

RIVER,ma-Toolbox

,adjust-Toolbox

NCH,wheelnutToolbox

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TWRENCH

WRENCHHANDLE

NCH

GANDROPEASS'Y

NGSTRAPASS'Y

WRENCH

R

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TRUCTIONS

forguidanceofpersonnel

quipment.Itcontainsinformation

escriptionandlocationofcontrols

EQUIPMENT

vehicleisfirstreceivedbythe

yforsecondechelonpersonnelto

sbeenproperlypreparedforservice

ndtobe sureitis inconditionto

ay beassignedwhenplacedin

allassemblies,subassemblies,and

perlyassembled,secure,clean,

icated.Checkalltoolsandequip-

arts,andAccessories)tobe sure

ndition,clean,andproperlymounted

techelonpersonnel(driver)will

services.

ENCIES.

hecourseoftheseserviceswill

inthescopeofthemaintenance

nbeforethevehicleis placedin

scopeofthemaintenanceeche-

oahigherechelonforcorrection.

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ns

natureto theattentionofthe

properchannels.

geand underinflation.Remove

sses.Besurevalvecapsare present

ph4d forcorrecttirepressure.

.Removetapeandrustand corro-

wingeye,air lines,andelectrical

earandwheelassemblytoseethat

perateproperly.

TS.Removerustandcorrosion

heelmountingandhub nutsand

untingandhub nutsandcap

FLECTORS.Removealltapefrom

nnections.Cleanalllensesand

flectorstoseethattheyare securely

htswitchestoseethatall lights

spectallaccessiblewiringandcon-

conditionandsecurelymounted

Examinebodytoseethatitis in

nted,andthatfuzeboxcoverand

curelywhenclosed.Inspectammu-

obesure theyoperateproperly.

ditionandissecurelylashed.

ONS.Inspectspringsandradiusrods

mage.Besureall clipsandattach-

presentandsecure.

BRAKES.Testservicebrakestobe

vely.Whenthetrailerisnotattached

gbrakesto seethattheyholdthe

arkingleverremainsin theapplied

s,chambers,androdstobesure

andadjusted.

nspectairbrakecylinderforsecure

ncondensationfromcylinder,and

linesand connectionstoseethat

onnected.

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T.Checktoseethatallitemsin

arepresent,ingoodcondition,and

Performacompletelubrication

instructionsin LubricationOrder

rts.

ehicleOperator'sManual,Lubri-

ormNo.478(MWOandMajor

cord)arein thevehicle,legible,and

registrationnumberandvehicle

FormNo. 478fornewvehicles.

nditionofthevehicletodesig-

tswitchislocatedatthebot-

efuzebox(fig.6).The switchis

erorsimilar toolinsertedinthe

no"OFF"positionontheswitch.

onorat thestandardlightposition.

datthetowingvehicle.

keleversaremountedjust

rsideofthefuze box.Thebrake

eroperatesthe brakeontheright-

eron theleftsideof thetrailer

dwheel.Thebrakesare applied

ward.Bothbrakesshouldbeap-

ledfromthetowingvehicle.When

dashortturn isdesired,thehand

urnismadeshould besettopermit

dingwheelis mountedon

herearofthe lunetteeye.Itis

on thelatchpinandswingingthe

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ns

wingVehicle,,

eel

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wingVehicle

utomaticallylocksthewheelin

g,by pullingoutonthelatch pin.

opismountedin theprop

body.Alwayslowertherearprop

mthe towingvehicletoprevent

.Afterthetraileris coupledandthe

opisraisedup againstthedoorsand

le.

hicle(fig.8).

WINGVEHICLE.Openpintlehook

ovingcotterpinandpullinglocking

owingvehicleuptodrawbarlunette

wbarlunetteeyeintobottomhalf

ckinglatchinto position,andlock

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ns

LES.Plugelectricaljumpercableinto

oftowingvehicleandintoelectrical

NES.Disconnecthosecouplingof

s(fig.1).Connecttrailerhosecoup-

cleby pressingtrailerhosecouplings

vehiclehosecouplings.Placegas-

erthe other,andturncouplinghose

nin hosecoupling.CAUTION:Be

romtrailertoemergencycouplingon

fromtrailertoservicecouplingon

earpropagainstthedoors,and

atchplateandpropleg foot.

Raiselandingwheelbypullingout

warduntillatch pinautomatically

ON:Thetrailer,afterbeingcoupled

moveduntilthelandingwheel

KES.Releasebothparkingbrakes

upward(fig.6).

lerbrakesandl ightsare

oseofthetowingvehicleandare

ivethetruck-trailercombinationin

uck,takingcarewhenbraking,turn-

turningcorners,thetrailer wheels

hetowingvehicle.Whenbacking

directionoppositetothatinwhich

ned.

plytrailerbrakesin coordi-

s.Neverpermittrailerbrakesto

lythetrailer brakessmoothlyand

withoutskiddingtires.Whenplacing

ureondashgageof towingvehicle.

than80poundsfor properapplication.

esandchecktheireffectivenessbe-

iler(fig.7).

S.Applybothparkingbrakesby

ig.1).

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nt

HEEL.Lowerthelandingwheelby

gwheelwilldropintoposition.

mustbeloweredbeforethetraileris

le.

Pulloutpinanddrop rearprop

oughholes inpropbracketand

opmustbe loweredbeforethe

ngvehicle.

ALJUMPERCABLE.Unfastenjumper

icalsockets,andstowcablein

ELINES.Uncoupletheserviceand

hetowingvehicle,andcouple

plingsmountedonthefuzebox.

OMTOWINGVEHICLE.Openpintle

ullinglockinglatchoutwardand

eeyeto cleanopeninginpintle

orward.

QUIPMENT

).

bodytopositionandhold

numberof stampedcupsper-

etrailer.Thecupsare1 inchand2

etintotheminthe uprightposition.

deup ofsixindividualracks

llsandserveto clampthemdown

heyareparalleltothefloor ofthe

cefor theloadingofpowder

ksarehingedat thesidesofthe

ht-handracksareprovidedwith

onedapproximatelyonthecenter

oksextendingdownwardtoengage

heleversare throwntothelocked

non theshells,theleft-handracks

esextendingundertheright-hand

ngpinis applied.Twoselective

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ns

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tions

thehinge mountingsandonthetie

einheightofthetwosizes ofshells

positionisprovidedbyscrewing

ods,thefinal settingbeingsecured

NDINGSTRAPS.

nthe upperpartofthetrailer

heprojectilecompartment.The

overleaf"bundleswhichpermits

ongitudinallyinthetrailerbody.

ecurelyin thebody.

ALCONDITIONS

TIONS.

raturesaffectbothmetalsand

ntatsub-zerotemperaturespresents

ecautions.Extremelycarefulser-

aintenancepersonnelisrequiredif

ionalfailurearetobe avoided.

0 generalpurposegreaseis

hthesamegrease below0F.

resareencounteredandNo.0

sfactorywherespecifiedabove,

epartmentSpecificationAXS-1169

eoil isprescribedforabove

icatingoil.

ghtenallelectricalconnections.

rtcircuitsarepresent.

dencytocausebrakestostick

at sub-zerotemperatures.Ablow-

esepartsiftheybind whenattempt-

hevehiclewith thebrakereleased

.Precautionmustbe takenunder

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ns

wheelsorotherwisepreventmove-

thevehiclefrequently.Shock

eagainstbreaking,isgreatlyreduced

perationofvehiclesonhard,frozen

whichwillresult inscrewsbreaking

extremesandordustconditions

,cleaning,andlubricationofthetrailer

nlashedsecurelyinplaceto keep

ioncarried.

endriven throughdeep

nwater,certainprecautionsmustbe

t isknownthatwater,dirt,and

sunitsofthe vehicle,notifythe

itwhichhasbeen submerged

d,cleaned,andlubricated.

leHasBeenSubmerged.If

edismantlingandthoroughcleaning

uldbe inspected,cleaned,andlubri-

hdamageaspossible.CAUTION:

onsideredasassurancethatfurther

BRAKES.Removethehubanddrum

rumsandshoes.Cleanandrepack

acetheoil seals.Ifcontami-

replacedtoavoiddamagetothe

ntleakage.

raincargocompartment.Re-

ncompartmentthoroughly.

MPLETELY.Lubricateentirevehicle

ehicleissubmergedinsalt

bedone,orelectricalequipmentand

n extentthatcompleterebuilding

lbenecessary.Onlybypromptand

lvaged.Inall casesofsaltwater

hority.

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*

Whenthe vehicleisoper-

epallexposedmetalsurfacespainted.

alsurfacesandquicklycauseforma-

movedandthesurfaceprotectedby

continuetorustawayandthe

ortionwillpeeloff,causingaddi-

metal.

NEMYUSE

nsubjecttocaptureor aban-

be undertakenbytheusingarm

militarycommanderconcerned,

areforinformationonly.The

onwillbeaffectedarecommand

tothetacticalsituation.

evehiclemustbesobadly

dto ausableconditioninthe

cannibalization.Adequatedestruc-

tialtotheoperationofthe vehicle

repair.Equallyimportant,thesame

onall likevehiclessothatthe

pleteoperatingunitfromseveral

NS.

ctionscontainseveralmethods

heorderoftheireffectiveness.

hargesofTNTinside each

onelectriccapswithat least5

e.CAUTION://chargesarepre-

hevehicle,keepthecaps andfuzes

heyareto beused.Ignitethefuzes

enadeundereachtireordeflate

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ns

nax,pick,ormachinegunfire.

and ignite.

k,antitank,orotherartillery,

a goodfireisstarted,the vehicle

mpercableandsocket,air

adeundereachtire ordeflate

x,pick,ormachinegunfire.

unit.

s,or,if notused,ignitethe

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CEINSTRUCTIONS

nfortheguidanceofthe

onsresponsibleforthe maintenance

quipment.It containsinforma-

heduledlubricationandpreventive

descriptionandmaintenanceofthe

functionsinrelationtoothercom-

TOOLSANDEQUIPMENT

orfirstandsecondechelon

OrderNo.726(fig.10)pre-

for4-ton,2-wheelAmmunition

onorisissued witheachvehicle

times.Intheeventthevehicle

ngarm shallimmediatelyrequi-

utantGeneralDepot.Seelists

orderarebindingon alleche-

llbe nodeviations.

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uctions

CATIONORDERNo.726

NGTON25,0.C.,26AUGUSTJ944

UNITION.M21

-LC,fly.II

y

Lubricateafterwash-

ning,orOil, fuel.

bothsides. Opposite

bricatehandbrake

.

s,radiusrodbushings.

willrema1nwiththeequ1p-

TEMPERATURES

No.2 Alltemperatures

ve,specia

d.ervicebelowO'F..r.l.rto TM9-792

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onViews

heorderare fornormaloperat-

etheseintervalsunderextremecon-

rlowtemperatures,prolongedperiods

oninsandor dust,immersionin

nyoneof whichmayquicklydestroy

icantandrequire servicinginorder

magetothemateriel.Intervalsmay

notinuse.

e"Key"in accordancewith

+32F,+32Fto0Fandbelow

egradesoflubricantsby maintain-

thevehicleduringtheapproachto

itwillbenecessarytochangegrades

raturesareconsistentlyinthe next

INSTRUCTIONS,

fullyandinsuchmanneras

fthelubricant.Iflubricationfitting

nceoflubricant,removethefitting

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uctions

okenordamagedlubricators.If

mediately,coverholewithtapeas

theentranceofdirt.

ups,oilersandoilholesarer ead-

bricationOrder.Wipecleansuch

urfacesbeforelubricantisapplied.

ed,applynewlubricantuntil

hevent.

urfacesonwhicha filmof

manualapplicationbeforethe

ventorDieselfueloilto

solineforthispurposeis pro-

rtsthoroughlybeforeapplying

alUnitsandParts.The

entandrepeatforclaritythosenotes

ertaintolubricationandservice

vebearingconeassembliesfrom

le,andinsideofhub anddrythor-

r.Inspectbearingracesand

dleandinsideof hubandhub

easeto amaximumthicknessof

bricatebearingswithNo.2general

y hand,kneadinglubricantinto

tremecaretoprotectthebearings

embleandreplacewheel.Donot

ntinthebearingis sufficienttopro-

viceperiod.Anyexcessmight

Adjustbearings.

ANDCAMS.Atperiodsofwheelbear-

bjectedtostandingforlong periods

ewheelsaftereachimmersionand

eshoerollersandcamswithNo.1

2F,andNo.0below+32F,to

lubricatehandbrakelinkage,land-

dshelfhinges,shelf linkage,etc.,

32F,SAE10from+32Fto0F,

ingoilbelow0F.

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HAFTFITTINGS.Lubricateanchorpin

ngssparinglytopreventexcessive

chanism.

otlubricatespringsandradiusrod

manceofmaterieltotheOrd-

ntenanceasprescribedinTM38-250.

maintainedintheDutyRoster

ESERVICES

eventivemaintenanceser-

area functionofusingorganization

irperformanceistheresponsibilityof

ations.Theseservicesconsistgen-

ng-operation,At-halt,After-operation,

bydriver,andthescheduledservices

ervalsbyorganizationalmaintenance

alinspectionofeachitem

mberor connection,andisgenerally

singoodcondition,correctlyas-

worn.

dition"isusuallyan external

hethertheunitis damagedbeyond

m"goodcondition"isexplained

tor twisted,notchafedorburned,

frayed,notdentedorcollapsed,not

seethatitis "correctlyassembled"

ctionto seewhetheritisin its

vehicle.

termineifitis "secure"isusually

wrench,hand-feel,orapry-barcheck

mustincludeanybrackets,lock

,orcotterpinsusedin assembly.

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ctions

derstoodtomeanwornbeyond

kelytoresultinfailure iftheunit

cheduledinspection.

(FIRSTECHELON).

efficiencyitisnecessarythat

pectedatintervalseachdayitis

maybediscoveredandcorrectedbe-

georfailure.Certainscheduledmain-

edatthesedesignatedintervals.Any

ngcharacteristicsbeyondthescope

reportedattheearliestopportunity

thority.Theservicesset forthin

ethoseperformedbythedriver,

on,At-halt,andAfter-operationand

verpreventivemaintenance

W.D.,FormNo.48,Driver'sTrip

nceServiceRecord,tocovervehicles

eculiartothisvehiclebutnot listed

edinmanualproceduresunderthe

Certainitemslisted ontheform

eareeliminatedfromtheprocedures

organizationmustthoroughly

themaintenanceproceduressetforth

sted specificallyonW.D.,FormNo.

D.,FormNo. 48thatapplytothis

ualto providespecificproceduresfor

sandservices.Theservicesare .ar-

dconservethetimeofthe driver,and

umericalorderasshownonW.D.,

however,areidenticalwiththose

VICE.

duleisdesignedprimarilyas

snotbeendamaged,tamperedwith,

ationServicewasperformed.Vari-

renderedthevehicleunsafe^for

edriverto determinewhetherthe

anymissiontowhichitis assigned.

lyomitted,eveninextremetactical

erviceconsistsofinspecting

eproceduredescribed,andcorrect-

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Uponcompletionoftheservice,

to thedesignatedindividualin

DAMAGE.Lookoverthetrailer

ntgenerallyfordamagewhichmay

abotage,shellfire,orcollisionsince

.Draincondensatefromair tank.

gs,andlinesfordamageandloosened

)ANDREFLECTORS.Cleanall

ghtassembliesandwarningreflectors

calsituationpermits,testlight

properly.

ANGENUTS.Inspectsidering,

cap screwstoseeiftheyare all

s fordamageandunderinfla-

ntreadsorcarcasses.

USPENSIONS.Examinespringsand

anddamage.

CTIONS.Inspectlunetteeye,land-

portforloosenessor damage.When

mover,parkingbrakesshouldbe

ctedtobesureit operatesproperly

tion.Ifconnectedtoprime mover,

gdevices,airline,andelectrical

dingwheelandrear supportare

DTARPAULIN.Inspectbodyfor

dpowdercontainersareevenly

byclampsorstraps.If inuse,see

springareingoodcondition,cor-

ed;orthattheyare properlystowed.

IPMENT.Besureallitemsare

ymountedorstowed.

VICE.

inmotion,listenfor any

ueals,orhumsthatmay indicate

ingoverheatedcomponentsorunits

When brakesareused,consider

ctoryorunusualperformance.

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uctions

nServicesconsistofobserving

eproceduresfollowingeachitem,

sofserioustrouble.Noteminor

ortedatearliestopportunity,usually

ringoperation,whentrailerair

pplied,observeif trailerbrake

.Beonthe alertwhentrailerisin

eratingcharacteristicsofsprings,axle,

eness,damage,inadequatelubrica-

alertforexcessiveswayorsag-

ndicateloosemountingofassembly

mproperlyconnectedtowingdevices.

mayberegardedasminimum

ldbeperformedunderall tactical

ensivemaintenanceservicesmust

consistofinvestigatingany

ion,inspectingitemslistedbelowac-

ngtheitems,andcorrectingany

otcorrectedshouldbereported

dualinauthority.

S:HUBSANDBRAKEDRUMS.Cau-

andbrakedrumfori ndicationsof

USPENSIONS.Inspectspringsand

enessor damage,andinvestigateany

goperation.

ANGENUTS.Inspectsidering,

cap screwstoseeiftheyare all

s fordamageandunderinfla-

ntreadsorcarcasses.

CTIONS.AteachMalt,examineall

arein goodconditionandsecure.

DTARPAULIN.Inspectbodyfor

semblyunits,andseethat allat-

inthatloadedshellsandpowder

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es

andproperlysecured.Besure tar-

shed (ifinuse),or safelystowed.

DWEEKLYSERVICE.

icesareparticularlyimpor-

erinspectsthevehicleto detectany

oped,andtocorrectthosethey are

promptlyreportresultsof the

vidualinauthority.If thisschedule

icleshouldbereadyto rollagain

-operationService,withfewex-

o ascertainwhetherthevehicleisin

wasleftuponcompletionofthe After-

erationServiceshouldneverbeen-

cticalsituations,butmaybe re-

vicesoutlinedfor theAt-halt

theAfter-operationService,

nsideranyirregularitiesnoticed in

peration,andAt-haltServices.The

sofinspectingandservicingthefol-

After-operationServicethatare

additionalWeeklyServices,the

edin subparagraph(b)ofeachap-

) ANDREFLECTORS.Cleanall

ect unitsforloosenessanddamage.

witchesand observeiflightsrespond

RING.Inspectall accessibletrailer

andfor loosemountingsorconnec-

or moisture.

spectfor damage.Removeall

asses.Seethatvalvestemsarein good

ight.

damagedorworntireswith

hanicaldeficienciesthatmightcon-

ortedforattentionbyhigherechelon.

USPENSIONS.Examinespringsand

age.Lookparticularlyfor broken

eboundclips,and loosehangersor

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uctions

NKS.

kand inspecttank,valves,

heyarein goodcondition,correctly

sfromairlinefilters and

ndwater.

CTIONS.Inspectlunetteeye,land-

portforloosenessor damage.When

mover,parkingbrakesshouldbe

dtobesureit operatesproperly

tion.Ifconnectedtoprime

nlockingdevices,airline,andelectric

dingwheelandrear supportare

Beforetrailerisdisconnectedfrom

earsupportmustbe loweredand

n.

DTARPAULIN.Inspectbodyfqr

dpowdercontainersareevenly

byclampsorstraps.If inuse,see

dspringareingood condition,cor-

ed,orproperlystowed.

attachmentmountingoras-

eduringthis inspection.

ng,mountingandhub nuts

ips,bodyandattachmentmounting

dammunitionrackandboxes.Be

echanismlocknuts,clevispins,cotter

ilerwherethisinspectionhas

nitsindicatedonthe War

srequiringattentiononaweeklyor

LE.

sings,powdercontainers,dirt,

gespaces.Removedirtorexcess

acilitiesandtacticalsituation

wipeoffascleanas possible.Look

facesonfinishor camouflagepattern

s,unlesscoveredfortacticalreasons.

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ble.NOTE://traileris towedinto

remustbetakenthatwateranddirt

ctricalunitsorwiring.

QUIPMENT.

itemsofequipmentarepresent

ms ofequipmentassignedto

goodcondition,andmountor stow

ureallstowagecompartmentlock-

.

TENANCE(SECONDECHELON).

eventivemaintenanceser-

daminimumrequirement-fornor-

unusualoperatingconditionssuch

dust,sandyorextremelywetterrain,

rtainmaintenanceservicesmore

hedriversshouldaccompany

anicswhileperiodicsecondechelon

reperformed.Ordinarilythe

cheduledpreventivemaintenance

dition;thatis,it shouldbedry,and

suchanextentthatinspectionand

ered.However,thevehicleshould

lycleanbecausecertaintypesof

ooseorshiftedparts orassemblies

areslightlysoiledordusty.

tion.Ifinstructionsother

alproceduresin subparagraphd.or

agraphi,whichfollow,arerequired

ntivemaintenanceserviceorfor

aybesecuredfromothersectionsof

tedindividualinauthority.

neralproceduresarebasic

wedwhenperformingtheserviceson

ocedures.NOTE:Thesecond

ughlytrainedintheseproceduresso

ically.

ssembliesareinstalledto cor-

entoseethat theyareclean,cor-

ricatedandadjusted.

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uctions

tretainerseals,a coatingofthe

esealingsurfaceof thelipofthe

herseal,itshould besoakedin

nutes.Theoilshould bewarm,if

houldbeworkedcarefullybyhand

mustnotbescratchedormarred.

ragraph25 b.

catedbyrepeatingtheitem

owtheintervalat whichtheservices

sorassemblieswhicharetoreceive

xample,anitemnumberinoneof

ENproceduremeansthattheactual

performed.Thespecialservices

adjustmentsinaccordance

manual,specialbulletins,orother

vehiclewithdry-cleaning

nt,dirt,andotherforeignmaterial.

n cleansolventanddrythoroughly.

untilreassembled,andbecertain

mrubberorother materialwhichit

egreasecoatingfromnewparts

agoodlubricant.

hisappliesbothto lubricationop-

evehiclelubricationorderandto

rbutshouldbeperformedin con-

erationsifpartshavetobe dis-

ce.

ofperformingspecialopera-

ywater,drainingandrefilling units

gthe oilfilter,aircleaner,orcar-

erationsshouldbeperformed

rceonthewrenchhandle)totighten

nicalpractice.Useatorque-indi-

Donotovertightenasthismaystrip

eningwillalwaysbeunderstoodto

lockwashers,locknuts,lockwire,

he tightening.

ditionsmakeitdifficultto

nceproceduresatonetime,they

ions,planningtocompleteallopera-

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All availabletimeathaltsandin

necessary,toassurethat main-

d.Whentimeislimitedbythetacti-

ervicesinthecolumns,shouldbe

e preventive'maintenance

calwiththoseoutlinedonW. D.,

ePreventiveMaintenanceService

f-trackVehicles.Certainitemson

tothisvehiclearenot includedinthe

eral,thenumericalsequenceofitems

themanualprocedures,butinsome

nservationofthemechanic'stime

duresforperformingeach

and6,000-mile(6-month)main-

alloccurfirst,aredescribedin the

charthastwo columnsatitsleft

mileandthe1,000-milemaintenance

foundthat aparticularprocedure

dmaintenances.Inorderto determine

ownthecolumncorrespondingto

veranitemnumberappears,perform

ethenumber.

sirabletoroad-test

rimemover.Theroad

nimumdistanceneces-

.

oremakingtheroad

onServiceasoutlined

iththetrailerin

operationofcontrols

hey operateeffectively

fsidepull,noise,or

trolsfunctionprop-

gbrakes.Observeif

perlyandholdsvehicle

sany unusualnoise

uspensionunits,or

ess,damage,inadequate

s.

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uctions

pletionofroadtest,

rforleaks.Withbrakes

ciabledropin air

WheelHubs).

drumandwheelhub

S

ceasfollows:

bserveifvalvestemsare

position.Seethat

yinflated,examinefor

.Removesuchobjects

dedintreadsorcarcasses.

has flatspots,cupping,

Removetiresworn

andexchangefornew

rnunevenlybutstill

eventhewear.Ap-

twillcausetire wear

nttypesoftreadsorwith

enceinexcessof,3Ainch

ehicle.

yareingoodcondition.

ngnutssecurely.See

OTE://tiresor

tinstallthemuntil

(items48,49,and 52)

,andShafts).Re-

nspectbrakedrumsto

andsecuretohubs.

coringordistortion.

es),forloosenessor

dshaftsarefree,and

mage.

ides,Anchors,and

akeliningsthrough

are sowornthatboltM


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xt1,000miles of

ratedinwater,mud,

e entereddrums,re-

emblyandinspect

gmustbereplaced,also

ubricatebearings,and

inedfor 6,000-mile

g.

mbliesremoved,inspect

ondition,securely

ontactwithdrums,

yworn.Seethatshoes

cured,andguidedby

ctingspringshave

ocorrectreleasedpo-

boltheadsmustbe

of operation.

tingmechanismwith

ressedair.

akes.

diusrodstosee

securelyconnected.

bNuts).Inspect

condition.Revolve

nofbearinglooseness

tenhub andcapnuts

eal.Washthoroughly

ctbearingcups,cones,

essivewear.

nallrelateditemsareper-

are tobeinstalled,

nsintheWarDepart-

hicle.

,andbesureall hub

e.

lvesontrailerbrake

conditionandsecurely

irreservoirtankfor

tingsandconnections.

dclosedraincock.

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uctions

SlackAdjusters).

ftheyare ingoodcon-

secure.Besureop-

excessivelyworn.

andHangers).In-

heyare ingoodcon-

secure.Lookparticu-

leaves.Tightenall

ps,andhangermount-

rdamage.

ytoframemounting

ecure.

ossmemberstosee

secure.

alwiringandcon-

conditionandsecurely

Inspectalltrailer

e iftheyarein good

dandmounted.Besure

notdamaged.

rakelinefilters.

delements,washin

llsecurelyusingnew

ompletelubrication

oinstructionsinWar

Omitonlythoseitems

cedduringperform-

cedures.Replacemiss-

gs.

Wipeofflenses,and

bliestoseeifall units

itionandsecure.

,andexamineunitsto

andsecurelymounted.

unitionRacksand

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reebutnot excessively

ssemblybolts,nuts,

elds.Cleanoutstowage

oxstrapsfordamage,'

stobe suretheyfunc-

forripsor otherdam-

andspring areproperly

ashed.Ifnotin use,

dlunettetoseeif

ecure.

vel,andRearLock

nentstoseeifthey

ssembled,andsecure.

swivelbutthat there

tlockingdevicesof

seethattheyare

OTE://traileris con-

heelandrearsupport

afterinspection.

brakeleversand

reingoodcondition,

nnectedormounted,and

tionofmechanismto

ethatall itemsare

operlymountedor

obesureallModi-

ompletedandentered

ficationsormajor unit

imeofthisservice.

nofthemaintenance

testthe trailerin

r,tobesureall ser-

Confinefinalroadtest

makeproperobserva-

cienciesfoundduring

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uctions

hootinginformationandtests

ine'the causesofsomeofthe

nder averageconditions.Each

heindividualunit orsystemisfol-

softhetrouble.Thetests necessary

siblecausesis responsibleforthe

blecause.

ANDRADIUSRODS).

LYBENTORBROKEN.Removeand

GERBROKEN.Replace(par.42b

CAUSINGSPRINGSORAXLETO

and tightenspringU-boltnuts

UTION.Distributeloadevenlytofront

S.Refertohigherauthority.

RBOLTS.Refertohigherauthority.

UTSCAUSINGMISALINEMENTOF

xleonspringseatsandtighten U-bolt

HANISM.

LE.Refertohigherauthority.

OPERLYADJUSTED.Adjustwheel

S.Replace(par.49aandb).

LYBENTORBROKEN.Removeand

NGS.Replacebrakeshoe(par.56

sealifnecessaryorreferto higher

laced.

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R.Refertoparagraph60.

S.Adjustbrakes(par.55).

NG.Replacebrakeshoe(pars.56b

ytohavebrakelining replaced.

g.

KESHOERETURNSPRING.Replace

handc).

STMENTTooTIGHT.Adjustbrakes

KESHOERETURNSPRING.Replace

bandc).

STMENTTooTIGHT.Adjustbrakes

LINING.Replacebrakeshoeand

sary(par.56 Itandc)or referto

ingreplaced.

RAKEDRUM.Replacebrakedrum

eplacebrakeshoe(pars.46cand

tohavebrakelining replaced.

Replacebrakeshoe(pars.46cand

tohavebrakelining replaced.

efertohigherauthority.

D.Replacebrakedrum(par.48b

EAIRPOWER.

EAIRBRAKEPOWERSYSTEM(BE-

akesystemontowingvehicleforlow

ontowingvehicleandtrailerfor ex-

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uctions

YPRESSUREFROMTOWINGVEHICLE

valvedeliverypressureontowing

ge,orreplacebrakevalve.

RGENCYVALVE.Replacerelay

EAIRBRAKESYSTEM(BELOW80

ontowingvehicle.

YPRESSUREFROMTOWINGVEHICLE

valvedeliverypressure.Adjustbrake

lve.

AMBER.Straightenrodorreplace

KAGE.Straightenrodorreplace

GLINE.Serviceorreplacetubingline

NE.Serviceorreplacehoseline

ER.Cleanfilter(par.66b).

ITHBRAKESAPPLIED.Seecausesand

elow.

HECKVALVEINEXHAUSTPORTOF

Serviceorreplaceexhaustcheckvalve


NE.Serviceorreplacehoseline(par.


NGSLACKADJUSTER.Lubricateparts

OPERLYCONNECTEDTOBRAKESYS-

Connecthosecouplingscorrectly(par.

BRAKESYSTEM.Chargeairbrake

GLINE.Serviceorreplacetubing

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ERLYCONNECTEDTOBRAKESYSTEM

ectlinesproperly(par.13 b).

NGVEHICLEINAPPLIEDPOSITION.

ition.

LVEINEMERGENCYPOSITION

pressurein airbrakesystemifcon-



VEONTOWINGVEHICLE.Serviceor

RGENCYVALVE.Replace(par.61

BERDIAPHRAGM.Replacebrake

sReleased.

LVELEAKING.Replacerelayemerg-

Serviceorreplacetubingline(par.

viceorreplacehoseline(par. 69

sFullyApplied.

GENCYVALVE.Replacerelayemer-

BERDIAPHRAGM.Tightenbolts

mflange(par.62b(2) (a)),

BERDIAPHRAGM.Replacebrake

Serviceorreplacetubingline(par.

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uctions

viceorreplacehoseline(par. 69

OSECOUPLING.Replacegasket(par.

AppliedandRelayEmer-

on.

RGENCYVALVE.Replacerelay

ntinAir BrakeSystem.

DRAINEDDAILY.Drainreservoir

NGVEHICLEPASSINGEXCESSIVEOIL.

AGE.Ifairbrakesystemsuccessfully

kingbrakehand leverfailstodo

vetheidlerleverassembly.Test

missingyokepin,usedforattach-

dler leverassembly,willcause

n.Amissinghandbrakelever

parkingbrakeoperation.Check

alandinstallationofparkingbrake

ragraph34h.

AKELININGS.Refertoparagraph

NGSLACKADJUSTER.Lubricate(par.

BES.

res.

YBUTTooRAPIDLYDUETOBENT

y.

lacewheel(par.46).

ptiresinflatedto75 pounds.

S.Adjustwheelbearings(par.49c.)

wheelstudnuts.

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Lubricatelandingwheel(par.24).

EL.Replacelandingwheel(par.

T.Straightenorreplace(par.75c

KENSPRING.Refertohigherau-

WINGVEHICLEORCORRODEDBAT-

oubleshootingsectionoftowingvehicle

UTCOUPLINGSOCKET.Replace(par.

LAMP-UNITS.Replace(par.79d).

NG.Checkwiringforshortcircuit.

ODEDTERMINALS.Cleanandtighten.

UTBLACKOUTSWITCH.Replace(par.

LJUMPERCABLEORPLUG.Replace.

CTOR.Replace(par.87handc).

TS.

ohigherauthority.

ONS.Refertohigherauthority.

WBARLUNETTEEYE.Tightenorre-

ckpintlehookontowingvehicle.

ETIES.Repairorreplaceropes(par.

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uctions

BSOROTHEROBJECTS.Drivecare-

E-LOCKS.Refertohigherauthority.

DROPE.Repairorreplacerope(par.

ghtenorreplacenutsonshellrack

LLRACKS.Refertohigherauthority.

odonendof camandlever

NGOUTOFLOCKEDPOSITION.Pull

angleonendofcamlever handle.

HIFTINGPOSITIONDUETOBROKEN

Fastenstrapsecurelyatcenterandalso

Replacebrokenstrap(par.84b

DRADIUSRODS)

A.

he M21suspensionconsists

woradiusrods, andnecessary

emainspringismountedunderneath

pringfitsintothe holesinthespring

wolargeU-bolts,installedthrough

pringclip plate,surroundtheaxle

the axle.Theendsofthespring are

openingsofthe springhangers.

ngfromjumpingoutofthe spring

axle andspringsalined,andare

d springstotheframe.Oneend

espringseat whichisweldedtothe

rodisattachedto thespringhanger

er.

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Rods)

DWASHER

CCENTRICBUSHING

CKBUSHING

HER

HER

mbled

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uctions

ca

al,slip-typespringconsistsof19

mentby acenterboltandtwore-

GN.Thefirst M21trailerswere

shavingthethreetop leavesequal

helength ofeachsubsequentspring

nanduseof tieboltitwas discovered

hespring hadatendencytojump

tiebolts.To remedythiscondition

ingswerealreadyconstructed),a

boltonalltrailers constructedwith

balanceofthe trailersandsprings,

first sixleavesequalinlengththus

m jumpingoutofspringhangerand

NOTE://springshavingonlythe

aresalvagedorsentto depotforre-

orinstallation.

orelievetensionfromsprings.

twoU-boltsholdingspring

gseat.

andspringhanger tiebolt

aragrapha(2) above.

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Rods!

munitionTrailerM2I

above).

frontspringhanger tiebolt.

oU-bolts.

hroughopeninginbottomof

hanger tiebolt,castlenut,and

woU-bolts.Tightenalternately

ngseat.

hbody.

A.G.O.FormNo.478,MWO

cementRecord.

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uctions

he radiusrodconsistsofa

tedwith rubberbushingscapped

hings.Thefrontendsofthe radius

inghangers.Therearendsof the

ngseats.Theeccentricbushings

orelievetensionfromsprings.

ccentricbushings.

ockwasher,andradiusrodpin

moveeccentricsteelbushings,

asher.

etweenopeninginfrontspring

nger.Placeotherend ofradiusrod

hholes inspringhangerand

bushings,oneoneachside ofrubber

extendbeyondholesin spring

en-endwasherattached.

enoughtoinstallradius rodpin

TE:Theradiusrodpin nutisto-

ghanger,butit istowardtheoutside

ngswill beforcedintoproper

eeleccentricbushingswillbe stopped

inghangerandspringseat.

ssary,refertosubparagraphd


cementRecord.

ortenradiusrod,removenut,

herend ofradiusrod.Tapsteel

pproximately1Ainchuntilthe

er.Turnbushing90degreesfor every

teradjustmentismade,tapsteel

nhanger,install washersandnuton

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ndTubes

ecurely.Adjustmentcanbemadeat

sidesof trailer.

AXLE,ANDWHEELS.

removecompletesuspension,

edasfollows:

ustaheadoftrailer axle,tore-

insfrom brake-operatingrear

n bothsidesoftraileraxle.

hfront springhangersasout-

andspringtie boltfromeach

,includingaxleandwheels.

dertrailer,liftingfrontend of

frontspringhangers.Atthesame

pperopeningsin frontspring

pins,washers,etc.,asoutlinedin

hroughopeningsinbottomof

ghanger tiebolts,castlenuts,and

2).

pullrodyokesontoslackad-

rpins.

ssary,refertoparagraph43d.


cementRecord.

IRES,ANDTUBES

A.

he wheelsareofthepressed-

e.Thetireisheldin positiononthe

lock.Thetwoopposedinnerand

size andareTimkenrollerbear-

mbattype.

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uctions

DWHEELS.

e)10-x 53/s-in.

one

he pressed-steel,ventilated-

ippedwithsideringswhichare

nd nuts.Thewheelontheright

hehub withright-handthreaded

leftsideof thetrailerisattached

edstudsandnuts.

0studnuts.NOTE:Theright

dsandtheleft wheelnutshaveleft-

ground.

eelassembly.Liftwheeloff

TION:Thewheelandtire assembly

ds;therefore,haveassistancewhen

heelandhubso wheelwillrun

ionunder axlespindle.Roll

lideandlift wheelontostuds,taking

reads.Installtopnut,butdo not

at wheelholesarecenteredon

natelyonoppositesides ofwheel.

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ndTubes

T

K

LASS'Y

mbly

otforcethem.

milesofoperation,inorderto

.G.O.,FormNo.478,MWO

cementRecord.

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uctions

DLOCK.

0x 20tiresarecombattype

areofthe heavy-dutytype.The

ds(maximum)cold.

ecore.Install valvecap.

reis notdeflated.

ingtwonutson oppositesides

ilbalanceofnuts havebeenremoved.

rsaltire ironorusualtypetire

ndbeadto pryoffsideflange.If

y,drivea tireironor chiselbetween

ndl oosenotherbeadfromwheel.

lyloosened,dropwheelona

e.

frombead,standtireup with

o tireasfaras possible.Usefoot

alve.

dlockandtireonsideofbead-

epadabout10inchesbackfrom

andcollapsebeadlock.CAUTION:

a.

otire, andpullit offthetube

y.

ckathinge.Slipbeadlockover

to tire.Rolltireone-quarterturn

.

adlockintoposition,usingtire

esfromcollapsedendand with

ppositethehands,jerkup,snapping

lockiscenteredontire.

epointedupinslot.

,lining upvalveslot.Usetire

on,andforceflangedownfarenough

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ndTubes

HOLECOVER

ELSTUDNUT

PSCREW

mDisassembled

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uctions

um

andsecondnutdirectlyopposite.

tepositions.

securelyinplace,insertvalve

sairpressure.

A.G.O.,FormNo.478,MWO

cementRecord.

BLY.

upportsthe wheelon10

akedrumandoil slingeronits

osedtaperedrollerbearingswhich

eonthe axleandincorrectaline-

t,pin-typelockwasher,inner

aring.

mblystraightofftheaxle.

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ndTubes

ollerassemblylooseandre-

r,washer,felt,andouterre-

espindle.

movethe 10nutsand10

er tohub(fig.16).

tainers,feltwasher,andoilseal

wparts.Inspectinnerand outer

es,andrepack(par.24)or replace

rcracksor dents,andwipeoff

movenutfrombrokenor worn

or bar,driveoutbrokenstud.In-

dshoulderwithhole.Drivestud into

alland tightenstudnut.

drumonhub,andsecurewith

twasher,oilsealfelt,and outer

heordernamed.

rollerassemblyonaxlespindle.

.

neand rollerassemblyon

ngnut,pin-typelockwasher,and

ngs(par.49 c).

r.24),andinstallhub cap.

bly(par.47c).

ck.

.G.O.FormNo.478,MWO

cementReport.

5and17).

ndrollerassemblies(par.48 b).

s,removehubanddrum as

hubisgroovedonoppositesides of

.Placesoft driftingrooveand,

romhub.

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uctions

.Removealloldgreasefrominside

y-cleaningsolvent.Dryandplace

ringcupsquare withthebore,

erplacedsothat itwillbeon the

ceapieceofhardwoodoverthecup

withouteredgeofhub. Placeold

ewcupuntilitis absolutelytight

re thatnewcupisproperlyseated,

tancebetweenthebearingcenters

fthewheel.Swabthetwo bearing

.

GCONEANDROLLERASSEMBLY.Re-

dle, andcleanspindlewithdry-

tretainer,feltwasher,oil sealfelt,

indle.Inspect,clean,dry,andlubri-

assembly(par.24). Slideinner

xle,andtap intopositionagainst

sembly(par.48d).

eetoturn. Makecertainthat

sixcapscrews,six lockwash-

-typelockwasher.

tingnut,turning ittightagainst

At thesametime,revolvewheel

onbearingcomeintocontact.Back

rotatefreely,butwithoutendplay.

eend ofabarbetweentire

ngonefingeroncageof outerbear-

tectanyexcessiveplayorloose-

bleshakeandthewheelwill rotate

ndouter jamnut.Tightenthe

n,since,in tighteningouterjam

tight againstinneradjustingnut

sextracautionassuresnormalbear-

ecessary(par.24),Position

p.Securewith sixlockwashersand

dremovejack.

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A.

ris equippedwithatubular

dlesare integrallyweldedtoform

edonstandardroadcrown,isforged

ure.Thecamshaftbracketsand

xlebeam.Thetubularaxlesupports

etherwiththeradiusrods,keepsthe

e stressesthatoccurwhenthe

paragraph44a.

movenutsfromU-bolts,forceoff

pringtoground.

ngs,drums,etc.,fromaxle,

.

eels,hubs,bearings,drums,

h49 forinstallationinstructions.

r,andinstall asoutlinedin

omaxle,install asoutlinedin

G.O.FormNo.478,MWOand

entRecord.

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ucfions

AINERG509-03-67750

GWASHERG509-03-430I7

LSEALG033-0I-00390

AINER'G509-03-67785

ITHROLLERSASS'YH0I2-6I-28640

TINGNUT

CKWASHER

NGJAMNUTG067-03-00740

OilSeals,andAdjustingNuts

movewheelandhubassemblies

eparatewheelfromhub.

ncefromcenterofdrawbar

raxlespindleatboth sidesoftrailer.

ouldnotbelessthan Vsinchnor

hesamedistanceontheroadside.

isacceptable.

sher,andpinwasher.Tap

gerapproximately1Ainchto relieve

rnbushing90 degreesforevery

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67/128

uction!

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nut untilbrakeliningistight

oor threenotches,measuredby

ldallowwheelto turnfreely.

notherslackadjuster.NOTE:

entin slackadjuster,anditis not

aft.,

he brakeshoesareequipped

mend ofeachshoe.WhentheS-

actstheshoe wearplate.Each

blocksboltedto theshoebyfour

s.Eachbrakeshoehas twobronze

the anchorend.

UB,ANDDRUMASSEMBLY(figs.14

t,lockwasher,andinner ad-

or.Pullwheelhub anddrum

efulouterbearingconedoesnot

ncethismight causedamagetocage.

gs.18and19).

wandwasher,holdinganchor

pin lockfromgroovesinanchor

rpinsfromshoeandspider.

eshoereturnsprings.

gs.18and19).

ngsontospringpinsof both

ngsinbrakespider atanchor

lywithgeneralpurposegrease

nsthroughholesin spiderandbrake

oovesinanchorpins.Usesquare

ntoline upgrooves.Securelockwith

r.

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uctions

nddrumassembly(par.48.d)

9c).

.G.O.FormNo.478,MWO

cementRecord.

he camshaftconsistsofthe

grallyforstrength.Thecamshaftis

ebrakespider.Airpressurein the

justers,whichturntheS-headsof

ebrakeshoes.

nddrum assembly(par.

ewwireandcamshaftcollar

ngwasherscrewandwasher

drift,knockcamshaftoffser-

moval.Camshaftcollarwillslide

ngcamshaft.

and,if worn,reporttohigher

hingsand,ifworn,reportto

insert serratedendofcam-

and)throughbrakespideropening.

eedendofcamshaftthroughcam-

tedend ofcamshaft.Install

ssembly,andsecurewithscrew.

brakespider,tightencollar set

ndtwistendsof wiretogether.

ndbrakespiderbushingspar-

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w^^Btas^M''^^vCAMPLATE

onTrailerAxle

eecapscrewsandlock

akespiderl ocatedoneachendof

ndustshields,unless se-

stshieldonbrakespider.Secure

ockwashersandcapscrews.

M

A.

brakeequipmentistopro-

ailerbrakesthroughthemediumof

nwiththeair brakesystemonthe

entally,theairbrakesystemcon-

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ctIons

ytodirectandcontroltheflowofthe

arytotransformtheenergyofcom-

rceandmotionto applythebrakes.

ystem(fig.21) andtheirfunctions

70inclusive.

motiveAirBrakeCo.

house221474

Westinghouse220353

ghouse215001

er)

ERVICEABILITY.

softrailerto hosecouplings

ndbuildup airpressureto100

eon towingvehicle.

esreleased,observerate ofdrop

hgage.Therateofdrop inair

dsper minute.

esfully applied,observerateof

dropmustnot exceed4pounds

vetestsisthecombinedleakage

owingvehicleandtheair brake

erair brakesystemisdetermined

stswithleakagefoundin similar

tinghoselinesclosed.Ifleakage

essive,checkallunitsandconnec-

eplace.

brakesandchecktheireffective-

ponseonallwheelsduring appli-

ut-outcockinemergencyline

necttraileremergencyhoseline

erbrakesapplyautomatically

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uctions

VE0850-220353

0-2I500I

39-0I-0393I

39-0I-03930

D024-02-0I882

MPERHOSEASS'Y0850-2I6464

REWH00I-I0-I3030

INGCAPSCREWH00I-I0-I3270

TINGLOCKWASHERH00I-I5-I80I0

TNGNUT.H00I-07-I8024

VEAND

00I-07-I8023

VEAND

WASHERH00I-I5-I8009

VEAND

CREWH00I-I0-I3246

NGCONNECTORH006-03-I2600

MERGENCY

8-56-002I0

VE

OWG098-56-00I90

VETO

GI50-0I-69029

H006-0I-00805

mponents

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ALVE

APHRAGM

alveSectionalized

temergencylineconnectionat

encyvalve.

bilityifbrakesystemfailstopass

LVE(figs.20,21,and 22).

erelay emergencyvalveis

lthe brakesonthetrailer,andto

esonthetrailer shoulditbreak

erelayvalvealsospeeds upthe

hduring applicationandrelease.

22).

,apply brakesandchecktobe

ailerapplyproperly.

e sureairpressureis exhausted

valve.

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uctions

ycharged,closecut-outcock

cleanddisconnectemergencyline

er brakesapplyautomatically.

ut-outcockontowingvehicle,and

allyrelease.

austportofexhaustcheck

leakage.

texhaustport withsoapsudsto

nemergencyposition(operating

austportwith soapsudstode-

kageatemergencylinehosecoup-

estsmustnotexceeda3-inch

essiveleakageisfound,replacethe

r tank.

kechamberairlines atrelayvalve.

shers,andbolts attachingcover

leteassemblyincludingairline

cyvalve.

emergencyvalvelinesatvalve.

ndboltsholdingrelayemergency

valve.

vetoanglebracketattachedto

,lockwashers,andnuts.

ergencyvalvelinesatvalve.

ame,andinstallwith thefour

kechamberairlines tothe

r.babove).

.G.O.FormNo.478,MWOand

entRecord.

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ectionalized

0,21,and23).

ebrakechamberisto con-

into themechanicalforceandmo-

es.Onebrakechamberisused

el.

tbrakechamberpushrods

hatbrakechamberpushrods

tlywithoutbinding.

tboltingflangesholding dia-

tocheckforleakage.Noleakageis

ightenflangeboltsevenlyand suf-

otcausetheflangeto bulgeby

ckforleakagethroughdia-

earoundpushrodanddrain holes

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uctions

ds.No leakageispermissible.If

gm.

causeprematurefailureof

ndiaphragmsarebeingreplaced,

ngandreplaceifnecessary.Install

,otherwiseunevenbrakingwillresult.

chamber.

midlerlever assembly.

sfrommountingbolts,andre-

eallnutsaroundflange.

21).

easespring,if necessary.Install

ustenoughto preventleakage.

ionandattachwith bolts,lock

mber.

verassembly.

eability(subpar.babove).


entRecord.

0and21).

nsistofawormandgear

vesas anadjustablelever.They

fadjusting thebrakestocompen-

brake operation,theentireslack

akecamshaft.Duringbrakead-

arsoas tochangethepositionofthe

ecamshaft.Oneslackadjusteris

el.

ustbrakes(par.55).Make

heckmotionofbrakeoperatingrods

tersmove,butfail toturnthecam-

bpars.canddbelow).

ke-operatingrearrodyoketo

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washerfromendofcamshaft,and

amesizeandtypeas oneused

haft,andinstallscrewand

e-operatingrearrodyokeand

otterpin.

erviceability(par.60).


entRecord.

ereservoir(fig.20) istopro-

dairsotherewillbe anamplesupply

akeoperation.Italso providesstor-

topermitseveralbrakeapplications

Anotherfunctionofthe reservoir

rmaycooland theoilandwater

20).

esystemcharged,coatoutsideof

for leakage.Noleakageispermis-

reservoir.

deandoutsidesurfacesfordamage

helpfulwheninspectinginterior.

orcorrosionisfoundthat would

r.Removemountingbolts,wood

ervoir.

aincockopeningisat lowestpoint.

,U-bolts,andnuts.

ty(subpar.babove).

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uctions


entRecord.

cockis installedinthebot-

oseofdrainingwaterfromthe reser-

the handleisparalleltothe body

nit isatright angletothebody.

trike thehandlewithahammer

,andleakagewilldevelop.

brakesystemcharged,

ndcheckbodyandkeyforleakage.

pbubblein 3secondsisnotper-

irtyor scoredkeyorbody.Leak-

aning,andapplyingathin coating

No.0onthekey beforeassembly.

ueto scoredkeyorbody.

fromreservoir.

r eservoir.

r.babove).

24).

are usedintheserviceline

o trapanydirtor matterwhich

orrectflowofairthroughthe filter

hebody.Airflowingfromthe tow-

ssthroughthefilterin thedirection

ngthroughthefilter readilypasses

whichmightbepresentinthe air

r.Moistureordirtwhichmaycol-

ughthedrainplug.

24).

nditionofairstrainer.Clean

ydustor dirtofftheoutside.In-

veredwithanoily orgummydeposit

ewgasketwhenassemblingthe

eror replacingthestrainerde-

itionsandamountofdirt passing

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alized

kesapplied,coatoutsideoffilter

e.No leakageispermissible.If

filter, replacefilter.Ifleakageisfound

dyoffilter,tightencoveror install

paragraph61c.

emergencyvalvelinesattheair

filtertocoverplate.

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uctions

O3O8567

e

mantletheair filtertoinstall

owonbodypointstowardair line

.

ergencyvalvelinesattheair

ctairlines (par.61d).

ity(subpar.babove).


entRecord.

E(figs.21and25).

kvalveisasmallrubber

dtopreventdirtandwaterfrom

ergencyvalve.

moveexhaustcheckvalve

immerseinwaterthelowerhalfof

eckforleakageofwaterpastdia-

ageispermissible.Ifleakageis

spectitscondition,alsoconditionof

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edbypresenceofdirt, cleaningthe

houldcorrecttrouble.Ifleakageis

eplacediaphragm.Ifleakageis

eat,replacecompleteexhaustcheck

eckvalvefromrelayemer-

.

stcheckvalveintoexhaust

g.22).Testfor serviceability(sub-

DUMMYCOUPLINGS(figs.20,21,

Hosecouplingsareinstalledonthe

ofthetrailerfor thepurposeofcon-

hetowingvehicletothetrailer.When

ogether,pressureisput onthetwo

tseal.Thehose couplingsarefitted

mmycouplingsareweldedtothefuze

plingsmustbeattachedtothe

owersystemisnot connectedfor

eringthe lines.

hhosecouplingsconnected

plingsandconnectionsattheair

orleakage.Noleakageispermissible.

n,damaged,orimproperlyinstalled

eakage.Replacehosecoupling

ow).

t outofhosecouplingwithscrew-

hoseby placingonewrench

anotherwrenchonhoseconnector,

pling.

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84/128

ODY

nectorBody

ANDHOSECONNECTORS

ingsare usedtoprovideflex-

ingvehicleandtrailer.The hose

connectorswithspringguards.

ine isrestricted,removecoupling

ugh hosetoclearpassage.

esapplied,coat hoseandhose

ckforleakage.Noleakageisper-

heckleakage.Ifthis failstocor-

ors,hose,orboth.

orsattrailerend ofhose.

ouplingfromotherend ofhose.

evefrom hose.

lengthatright anglestooutside

hose.

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uctions

hTubeCutter(41-C-2825J

cuttings.

eveonhose.Makesure the

owardendofhosebeingconnected.

of guideinconnectorbodyso

orcoveringwillbenextto hose.

mgasket,andpushgasketintobottom

bodyagainstgasket.

stedgeofconnectorbody.Tighten

ureairtightjoint.

igs.20and21).

sedto connectvariousde-

simportantthattubing ofthecor-

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eused inrepair,otherwisethe

entwill beseriouslyaffected.Three-

ittingsare.usedthroughoutthesystem.

usedingasolinel ines,mustnotbe

em.

ctionscausedby dentsor

moveandblowairthroughline

esapplied,coattubingandfittings

e.No leakageispermissible.

rrectleakage,replacethefitting.

tallnewpiece.

emovingtubingfittings.

niftheyare serviceable.However,

lengthwithhacksawortube

smoothandiscutsquarelywith

tiallycloseendsoftubing.Ream

y.

bingto removeallcuttingsand

tubing,andputendof tubinginto

ess,andtightennutuntil sufficient

reventleakage.

nd29).

mountedjustaheadof the

uzebox,are usedtoapplythebrakes

oatowingvehicle.Thebrakehand

eroperatesthe brakeontheright-

onthe leftsideofthe trailer

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cfioni

KSPRING8720-9-I2-2

KSPRINGCAPSCREWH00I-I0-I3007

720-9-35-3

Y8720-9-A43-I

RASS'Y

TPULLROD8720-I7-45-2

PULLROD8720-17-45-3

RODLOCKNUTH00I-07-I8025

PULLRODYOKEH00I -I8-I0060

RODJOINTPIN8720-I7-33-2

TERPINH00I-08-I1I0I

IN8720-9-42-I2

KSPRINGLOCKWASHERH00I-15-I8007

KSPRINGNUTH00I-07-I800I

BrakeLinkage

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dwheel.Thebrakesare applied

lled downward(fig.1).Thepark-

and leversandpushrodswhich

sembliesandtheoperatingpullrods

er assembliesandtheslackad-

dthebrakelinkage,fromtheidler

er,arethe sameasthoseusedforthe

kesshouldbeappliedwhenthe

ngvehicle.Whenthe traileris

isdesired,thehand brakeonthe

ustbeset topermitthatwheelto

epushrodyokeassemblycan

toexceed1inch.Positionthe washer

assembly1inchfromthelower end

gbrakeinthe releasedposition)by

ashertotherequiredpositionand

ut.

arkinghandbrakelinkage

e necessaryinordertoreplacecom-

emovingcotterpinsand lever

iptheweldoff thepushrodpin on

op. Removepin.

yokeassemblybyremovingcot-

rassembly.Theyokeassemblywill

d.

nattachingfront operatingpull

movecotterpinandyokepinattaching

djuster.Sliderodassemblytoward

odjointpinto separatethetwo

y,removecotterpinand yoke

rodto idlerlever.Removecotter

hambertoidler leverassembly.

er levershaft,slideoutshaft,and

movecotterpinandyokepinattach-

semblytoidlerlever.

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uctions

partsrequired,usingnewyoke

y.

betweenthemountingangle

dcenteroftrailerandhorizontal

rtidler levershaftandinstall

ilergussetand outsideendoflever

rodyoketoidler lever,andin-

hrodyokeassemblyintobottom

ketoidler lever,andinstallyokepin

inchfrombottomofpushrod

hasbeenremoved,attachfront

ingpullrodwithjoint pin.Feed

ox section,andconnectfrontoperat-

blywithyokepinand cotterpin.

slackadjuster withyokepinand

bottomofidlerleverassembly

G.O.FormNo.478,MWOand

entRecord.

RPROPSUPPORT

ngwheelsupportsthe front

otcoupledto thetowingvehicle.

derthe drawbartotherearof the

e16-inch,disk-type,steelwheelat-

k assembly.Aquadrantassemblyis

racketbya bolt.Thespindleof

wivelhousing andforkassembly

screw,thuspermittingthewheel

atchpinassemblyisusedto

ntinthe loweredorraisedposition.

owing,bypullingoutonthe latch

rduntil thelatchpinautomatically

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pport

7-I3004

-430I7

002-05-04208

Y

UTH00I-07-I6005

I0I-54I399

isassembled

. Itislowered,forparking,by pull-

ON:Thelandingwheelmustbe

rfromtowingvehicle.Thetrailer,

vehicle,mustnot bemoveduntil

unningposition.

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92/128

osed,therearpropis raisedagainst

ckandbrace(fig.2). CAUTION:

eforeloadedorunloadedtraileris

sideofpropleg. Removepinand

t.

ear propsupportbetweenbracket,

insideofleg.

ofthewiringcircuitsincluding

ouplingsocket.Currentforthelights

e,andistransmittedthroughthe

ingsocketlocatedonthetoolbox

showsthecompletewiringforthe

etaillights, couplingspcket,and

gage,stranded,insulatedwiremade

duit.

ilerlighting systemissup-

eelectricaljumpercouplingcable,

connectedtothec

Tm 9-792 M21 AMMUNITION TRAILER

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Transcript of Tm 9-792 M21 AMMUNITION TRAILER