tm 9-747 155-mm gun motor carriage

7/28/2019 Tm 9-747 155-MM GUN MOTOR CARRIAGE

1/274

NICALMANUAL

RIAGE

ER

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icDomain,Google-digitized

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NICALMANUAL

RRIAGE

ER

BRUARY1945

TONOFRESTRICTEDMATTERNOpersonisentitledsolely

ositiontoknowledgeorpossessionof classifiedmatter.Such

those individualswhoseofficialdutiesrequiresuchknowledgeor

graph23b,AR380-5,15March1944.)

PublicDomain,Google-digitized

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ebruary1945

otorCarriageT83and8-inchHowitzer

ishedforthe informationandguidanceof

TARYOF

AGF(10);ASF(10);Depts(10);AAF

S DivASF(1);TechSv(2); SvC

(5);Dist O,9(5);DistBr O,9

hments,9(5);DecentralizedSub

10);USMA(20); A(10);CHQ

6-125(2), 6-127(3),6-129

3),9-57(3),9-65 (3),9-67

97 (3),9-317(3),9-325(2),9-327

ls,seeFM21-6).


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..........1-25-8

...3-58-11

c-

-21

INSTRUCTIONS

.........1022

22-27

ts...14-1527-33

ary

34-37

ual

37-41

41-42

ANCEINSTRUCTIONS

.........2443

tools

43-45

6-2746-53

nce

53-82

..35-4782-97

ddata.48-4997-99

99-108

e.......52-53108-111

ystem..54-62111-120

...63-69121-132

0-80133-141


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NCEINSTRUCTIONS(Cont'd)

tem81-83142-143

ystem.84-93143-154

67

n101-102167-172

niversal

naldrive

00

pring

220

21

130221-224

226

t137-138226-227

on139-143228-230

ons144-152230-238

ontrol

49

4249-260

es165-167260-264


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publishedforinformationandguidance

theoperationandmaintenanceofthisequip-

tedbydescriptionsofmajorunitsand tneir

ercomponentsofthis vehicle.Theyapply

MotorCarriageT89,and tothe155-mm

ndarearrangedas follows:PartOne,Intro-

ngInstructions;PartThree,Maintenance

,Armament.

ofthemanualcontainsalist ofrefer-

nomenclaturelists,technicalmanuals,and

bletothevehicle.

cableforusein performingprescribed

w,withabrief explanationofeach.

O.7360,ARMYMOTORVEHICLE

formwillbe issuedbycommanding

tations,ororganizationstoalloperatorsof mili-

ssedthedriver'sexamination(TM21-300)

theparticularvehiclesnotedonthepermit.

BRICATIONORDER.WarDe-

erNo.9-747prescribeslubricationmainte-

bricationOrderisissuedwith eachvehicle

atall times.

26,DRIVER'SREPORTACCI-

TATION.Onecopyofthisformwill

alltimes.Incaseof anaccidentresultingin

,itwill befilledoutbythe driveronthespot,

thereafter.

RMNO.48,DRIVER'STRIP

MAINTENANCESERVICEREC-

xecuted,willbefurnishedtothedriver

hedonnontacticalmissions.Thedriverand

willcompletein detailappropriatepartsof

dnotbe issuedforvehiclesinconvoyoron

ructionswiththemateriel,thistechnicalmanualhas

eofcompletetechnicalreview.Anyerrorsoromissions

esor,if extensive,byanearlyrevision.


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rriageJ83

CarriageT89

torCarriageT83,and

riageT89


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nchHowitzerMotorCarriage789

ersesideofthisform containsthedriver's

vemaintenanceservicereminderschedule.

O.478,MWOANDMAJORUNIT

TRECORD.Thisform,carriedwiththe

personnelcompletingamodificationor

ne,transmission,transfercase,tracks,etc.)

arlythedescriptionofworkcompleted,date,

ge,andMWOnumberornomenclatureof

performingtheoperationwillinitialinthe

pairs,parts,andaccessoryreplacementswill

O.6,DUTYROSTER.Thisform,

edforschedulingand maintainingarecord


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perations.Itmaybeusedforlubrication

O.462,PREVENTIVEMAINTE-

HNICALINSPECTIONWORK

NDTANK-LIKEWHEELED

eusedforall 50-hour(500mile)or100-

,andfortechnicalinspectionsofthese

O.9-70,SPOT-CHECKINSPECTION

VEHICLES.Thisformmaybeused

sortheirstaffrepresentativesinmakingspot-

ehicles.

O.468,UNSATISFACTORYEQUIP-

willbeusedforreporting manufacturing,

ctsinmaterielwitha viewtoimprovingand

ndforuseinrecommendingmodificationson

be usedforreportingfailures,isolated

nctionsofmaterielresultingfromfairwear

age;norforthe replacement,repair,orthe

nt.It doesnotreplacecurrentlyauthorized

cerecords.

O.9-81,EXCHANGEPARTORUNIT

stag,properlyexecuted,maybeused

ceableitemsforlike serviceableassemblies,

NMODELS(figs.1and 2).

dels.The155-mmgunmotorcarriage

ermotorcarriageT89are identicalvehicles

ghtingequipment.Bothvehicleshaveuni-

arryingrackstocarry155-mmor8-inch

emaybechangedfromthe155-mmto the

rsa,andtherecoiland equilibratormecha-

y.Thetubeinstalledis,therefore,theonlyfac-

therthevehiclecarriesaT83or T89desig-

d2).

armored,full-tracklayingvehicle

mgunMlor M1A1,orthe8-inchhowitzerMl

for acrewof8men.The 155-mmgunorthe

edontherear ofthegunmotorcarriagesimilar


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arriageM12.The T83orT89vehicleis in

noftheM12,basedon themajorcomponents

Thevehicleis designedwiththedriver's

theenginecompartmentinthemiddle,and

attherear.

ehatchdoorsaremountedontop and

andprovideaccesstothedriver'sand assist-

or.Thevehiclesareequippedwithan

hullfloor behindtheassistantdriver'sseat.

othhatchesareclosed,directvision

sin thehatchcupola,andindirectvisionis

hdoor.

ehiclesareequippedwithradiofor

orintratank,communication.

cle.Thevehiclesarepoweredbya

er,radialgasolineengine.Theengineis

e vehicle,andisaccessiblethroughahinged

d twoinspectionplatesinthefloorof the

partment.

etankserialnumberis locatedon

thedriver'sseat.

padeassemblyisanchoredtotherear

bracket.Whenthespade isin"UP"position

fthefightingcompartmentinthevehicle.The

oweredpositionformsa rampassemblyand

keepthevehicleinpositionwhenthegun is

redbyahand-operatedwinch,locatedinthe

cle.

hehand-operatedwinchisusedto

ssembly.

T83)

Viin.


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l

dial,air-cooled

0

uin.

m

m

rear)Clockwise

30

k

1,550Ib

efueling107

higher

matequartsperhour)2

tialoilcapacity38gal

donhardroad24mph

nespeed2,400rpm

eed800rpm

gability60%

ngability60%

6in.

er83ft

e(forwardandbackward)34in.

orwardandbackward)92in.


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cessories

thtracks7,544sqin.

k86

persquareinch)10.2

Differential).

mission

DACCESSORIES

reforinformationonlyand mustnot

isition.

83only,thelists fortheT89will vary

he 8-inchhowitzer.

ockNumberStowageLocation

277)Onenginedeck

x Onenginedeck

Onenginedeck

dleOnenginedeck

on

S-3170)Onenginedeck

eOnenginedeck

ghtsponson

ass't.driver's

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t.,Intoolbag

t.,%in"

309-20)

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,ratchet,Va-in"

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cessories


,8-inIntoolbag

,12-in"

,44s/8-inOnenginedeck

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ockNumber.StowageLocation

sqdrive,Intoolbag

9)

sqdrive,"

)

sqdrive,"

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sqdrive"

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ents)"

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ong

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cessories


bittypeIn gunchest

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ose enginecompart-

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R-184-240)Onmuzzleover

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n(41-S-4658-120).."

howitzerMl)...."

nBook,O.OInpamphletbox

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ition.

ATELOADING)FOR155-MM

H.powder 8inpowdercompt,

container)rightside hull

82-0-41)

edet.H.G.M6)

C13-17-3)

nboxes(07032-

oosterM21A2.

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-mmgunM101.


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cessories


-36-1A)4onlids ofpowder

8Inbox(D7032-

1 InmountT14

plete,composed....Inbracket(7055-

er'scompart-

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squadrant,Onrearofright

8)(forIn gunchest

7691403)

elescopeInbracketsonrear

ope(D40871)OnmountT14

forquadrant....In chestM21

forpanoramic..."

fortelescope...."

fortelescope...."

mountT14

2(left)(telescope"

escopeM12)

4(right)"

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ete,composed...Verticalrackon

1(D37993 )

Ml(15-12M)Inbracketonright

M14,com-In chestM21in

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rd(RF-ll-ED)

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(l-T-283-375)"

6A1FIncase(D40871)

-222)IncaseT16onleft

,M12(91-92)Incase(D40871)

dnomenclature...Inpamphletbox

G.O.(incontainer"

155-mmgunMl"

75-C4engine"

icle(foroperator)"

rtment,No.9-747..Intechnicalman-

/cover

ntRC99Inrightsponson,


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cessories

ockNumberStowagelocation

Shippedloosewith

R-610,SCR-619,..Inrightsponson,

t.driver's

loosewith

edloosewith

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nating,1Vi-qt1in bracket,asst.

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est,lighting,

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g,19-qtRearofengine

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osetype,


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85)2inbracketsin

e,No.2,Ingun chest

230-5)

5-ozcapIn toolbag

cle,12unit2in bracketright

t)(LM-35A).. .Intoolbag

45 ftOnguntubebe-

spout,In bracketonfloor

com-

er,1qt Rightrearhull

P-29)Ontopof leftshell

e,1burner,Inbracketunder

No.520

de,30-ftIntoolbag

-T-13600)"

ack,14-ga.,

r 8men)orLeftfront chest

r8 men)Leftrearchest

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cessories

RTS.


rdriver'sInbox(B82340)

river

track)(7069543)Inrightfrontchest

8volts,Intool bag

ack)(7069545).In rightfrontchest

k)(7069549)

0track)(C139817)

Vs-inIntool bag

(7669401)In box(D82340)

)Indriver'scom-

ereticleInchest,light, M21

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NSTRUCTIONS

mationforguidanceofpersonnelre-

hisequipment.It containsinformationon

ithdescriptionandlocationofcontrolsand

OFEQUIPMENT

reconditionedvehicleisfirst received

tis necessaryforsecondechelonpersonnelto

hevehiclewilloperatesatisfactorilywhen

urpose,inspectallaccessories,subassem-

ndequipmenttoseethatall areinplaceand

tion,theywillperformarun-intest ofat

inAR,850-15,paragraph25,tableIII,

nparagraph12below.

es.Deficienciesdisclosedduringthe

illbetreatedasfollows:

eswithinthescopeofthemaintenance

zationbeforethevehicleis placedinservice.

yondthescopeofthemaintenanceechelon

oa higherechelonforcorrection.

riousnature totheattentionofthe supply-

ES.

eethatportableandfixedtanksare

nes,andnozzlesaresecurelymounted,and

y aimed,andnotclogged.

kfuelintank,andseethat oilisatproper

hedtothetank fillercapconcerningcon-

nsonthetag beforestartingtheengine,when


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quipment

rometertest,andaddcleanwaterto

eded.Inspectterminalconnectionsandbolts

ndsecure.

EATHERCAPS.Examinecrank-

buretoraircleanerstosee iftheyarein good

moveoilcups,washcupandelementsindry-

reservoirstoproperdepthwith freshengine

ctsandair hornconnectionsaretight.

LTS.Seethataccessoriessuchascar-

ngmotor,generator,andfiltersaresecurely

torbeltisadjustedto Va-inchdeflection

movesilicagelbagsfromenginecompart-

Examineallaccessiblewiringand

ingoodcondition,securelyconnected,and

KS,CONNECTORS,WEDGES,

theseitemsare ingoodcondition,cor-

ure.Onvehiclesequippedwithhorizontal

dbeno bulgeintracksbetweentheidler

nsionwheels.CAUTION:Donotadjust

edwithhorizontalvolutespringstootightly.

ANDFLANGENUTS.Examine

tion,properassembly,andsecurity.

ndersforgoodconditionandsecure

ONS.Inspectpintlehook,cables,and

onditionandproperoperation.

RMORPLATE(ENTRANCEAND

NS,PAINT,ANDMARKING).Inspect

morplateissecurelywelded,thatentrance

teproperly,andthattheyarewelllubricated.

nescapehatchlatchduringinspection.

andclosefreely,thatthereareno brightspots

ndthatmarkingsarelegible.

WINCH.Inspecttheseitemstosee

ditionandthatallattachingmechanismis

nethewinchcablestoseethattheyarenot

cables,sheavesandrollerareproperly

rampslides freelywhenrampisinlowered

gpins holdrampsecurelywheninraised


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DBOWS.Besurethatallprotective

nmaterialhas beenremovedfromgunand

ockreleasedtesttraversingandelevating

peratesproperly.Besure tolockgunsecurely

ng.If inuse,seethatbowsare properly

aulinis securelyfastened,ifnotinuse,tar-

operlystowed.

ureallprotectivetapehasbeen re-

opesaresecurelymountedintheir holders,

odconditionandproperlystowed.CAUTION:

onlywitha softclothorbrush.

acompletelubricationofthevehicle,

rdingtoinstructionsonLubricationOrder,

rcaseoillevels.Addoil togearcasesasneces-

vels.Changeonlyifconditionofoilindicates

tofproper gradeforexistingatmospheric

ormitems(16)to(19)duringlubrication.

NSIONS.Inspectvolutesprings,

ensionwheels,supportwheels,andwheeltires

.Onvehiclesequippedwithhorizontalvolute

absorbers,andseethatthe aboveitemsare

yassembled,andsecurelymounted.See

arenotleakingexcessively.

pplytheleverstogetherandinde-

uldbe4to 4l/zinches,andleversshouldmeet

heverticalposition.Checkreleasedposition

ctlypositionedwhenhorizontaldistance

ousingcovertofront edgeofleveris 7to7Vi

geandconnectionsforgoodconditionand

NIVERSALJOINTS,AND

haftanduniversaljointstosee thatthey

curelymounted,andthatventsare present

urncrank50timestocheckfor

primer,ifnecessary,andstartengine,

hassatisfactoryspeedandengagesand

andthrottletorunengine atafastidle.

gengine,observeifprimeractionis

eaksatpumpor connections.

neoilpressure mustbeindicated

essure mustbe40to70 poundsat1,800

nute.Stopengineimmediatelywhen"low


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quipment

g,ammetermayshowhighcharge

g isrestoredtobatteries;then,if battery

ssoriesareturnedoff,azero,or slightcharge

eGage.Readingshouldrisegradually

normalrange,whichshouldnotexceed

movevehicleuntiltemperatureis100F

ge.

etershouldregisterenginespeedin revo-

ordaccumulatingrevolutions.

ectorswitchinrelativeposition;gage

ateamountoffuelineachtank.Ordinarily,

nd gageshouldregister"FULL."

Observewhetherornot engine

ndacceleratorpromptlyandproperly,and

essorbinding incontrols.

ne andoperation.

REFLECTORS.Besureall pro-

ovedandobservewhetherornot alllights,

plights,respondtothe switchesinboththe

xaminetheinsideofenginecompart-

ndcheckallaccessiblelinesandseals forfuel

ENT.ChecktoolsandOn-vehicle

besure allitemsarepresent,andsee that

roperlymountedorstowed.

ocedures(1)to(10) inclusive,during

e.Onvehicleswhichhavebeendriven50

eofthedeliveryfromthe supplyingtothe

ethelengthoftheroad testtotheleast mile-

servationslistedbelow.CAUTION:Con-

gineatspeeds approachingthemaximum

ateshouldbeavoidedduring thetest.

DGAGES.Donotmovevehicle

ereaches110F.Observereadingsofoil

fuelgage,andtachometertoseeiftheyregister

nits towhichtheyapply.Withthevehicle

ershouldregistervehiclespeed,andthe

accumulatingmileage.

DPARKING.Steeringbrakes

elywithVaratchettravelinreserve.With


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kingbrakelock,depressclutch,andpull

ingbrakemustholdvehiclewithV2 ratchet

sremainin appliedposition.Applysteering

noticewhetherornottheysteerthe vehicle

otdrag,andshouldengagewithout

tter.Testclutchforslippageunder load.

approximately13Ainches.Shoetorelease

beVsinch.

shiftmechanismshouldoperateeasily

dnotslipout ofmesh.

strespondto controls,andhave

ithoutunusualnoise,stalling,overheating,

onthealertcontinuallyforunusual

oosenessoftracks,bogies,sprockets,oridler

ILEINTERVALSFORSERV-

ehandcautiouslyoneachsupport

eelhub,tofeelwhetheror nottheyareabnor-

e toohottotouchwith thehand,bearings

cated,damaged,orimproperlyadjusted.On

rizontalspringsuspension,shockabsorbers

evehicleisbeing operated.Ifshockabsorb-

uringoperation,it isanindicationthatthe

bsorbersarenotfunctioning.Checktrans-

overheatingor excessiveoilleaks.

ngineandfightingcompartments,

ndallvisiblelines,for fueloroilleaks.Trace

andremedyor reportthem.

pecttracksforsatisfactorytension.

horiontalvolutesprings,thereshouldbeno

lerwheelsandrear suspensionwheels,and

dtheforwardsuspensionwheels.CAUTION:

tedtootightly onvehiclesequippedwith

Besureadjustmentlockingdevicesare

dReports.

atvehicletechnicalmanuals,Lubrica-

No.26(Driver'sReportAccident,Motor

A.G.O.FormNo.478(MWOandMajor


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entRecord),areinthe vehicle,legible,and

.S.A.registrationnumberandvehicle

edinonFormNo. 478,fornewvehicles.

etionoftherun-intest,corrector report

eportgeneralconditionofthevehicleto

thority.

ENTS

.3).Twofuelshut-offcontrolsare

eft sidesofthefrontbulkheadin thedriver's

trolsareconnectedbylinkageto thefuelshut-

bottomofthe verticalfueltanksintheengine

ON"positionsareindicatedonthe valve

r-typeprimingpumpisbracket-

t theright,andinfront ofthedriver.The

uel tank,andforcesittothe primerdistribu-

chargeoffuelisdistributedto thetopseven

ng.

-pulltypehandthrottleis bracket-

pump,andconnectedbyacableto anarm

rolthecarburetorthrottle,whichopensmanu-

quippedwitha springcatchsothatthe

gcanbesetin afixedposition.

.Thefootacceleratorismountedon

fthedriver,andis connectedbylinkagetothe

thecarburetorthrottleisregulatedto control

pedal,whichismountedonthe sub-

stablelinkagetothecrossshaft, through

nbedisengagedtodisconnecttheengine

fting gears.Alinkageconnectionwiththe

inetoidlemoreslowlythannormal toreduce

g.Thepedalisspring-loadedandwill return

enfootpressureis relieved.Anovercenter

dforeasier operationoftheclutchpedal.

Lever.Thegearshiftleverismounted

ransmission.Itis usedtochangegearratios

operationofthe vehicle.Theleveris


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ontrols

htopreventaccidentalshiftinginto first,or

Twohand-operatedleversmountedon

dbylinkagetothe brakeshaftswhichoperate

aldrive.Therightlevercontrolsthe right

ntrolsthe lefttrack.Whenoneleverispulled

ownandthe speedoftheothertrackis in-

besloweddown,orstopped,bypullingboth

y.

Whentheparkingbrake pedalis

ngbrakeleversareheldin anysetposition.To

kickthepedalto therear.

4-voltand12-voltbatteryswitchesare

masterswitchboxwhichismountedonthe

boxon theleftsponson.Operatinginstruc-

ormationappearonthefaceofthe switch

tchAssembly(fig.5).Thisassembly

t corneroftheinstrumentpanel.


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sthe magnetos,andismarked"OFF,"

rrightmagneto,and"BOTH"forboth

aremarked"BOOSTER"and

erationofthe boostercoilandthecranking

ngtheengine.NOTE:Theboosteris used

o-equippedengines.

g-loaded,andwillreturnto the"OFF"

heboosterswitchisoperatedinconjunction

TARTER"toproducesufficientignition

eengine.

5).The fuelcut-offswitchiscontrolled

on thelowercenteroftheinstrumentpanel.

degasser)solenoidvalveon thecarburetor

eengine.

The mainlightswitchismountedin

heinstrumentpanel.Asafetybuttonispro-

allightingofunwantedlightsundercertain

witchhasfivepositionsmarkedasfollows:

ight

ers

used)

5).Thisswitchis locatedintheupper

ntpaneland hasan"OFF"positionandfour

RIGHT,"tocontroltheindirectlightingof

hecompass.

Circuitbreakersareprovidedfor the

cletoprotectthe wiringandequipmentfrom

dsorshortcircuits.Thecircuitbreakersare

e instrumentpanel,withfiveresetbuttons

erofthe panel.Identificationofthecircuitis

hbutton.

outletislocatedattheupper leftof

sprotectedfromdirt anddamagebyaplug

ypesocket.Theoutletisusedfor connecting

elights,etc.

.Anemergencystopswitchislocated

oxandits functionistogroundthe magnetos

immediatestop.


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uelgageismountedtothe extreme

sinthecenterof theinstrumentpanel.The

nectsthegagetotherightor leftfueltanksis

egage.Thegagewillindicatethe amountof

s,whentheselectorswitchis turnedto"R"

).Theoilpressuregageis mountedon

ediatelytotherightof theammeter,and

ctricallythroughavaryingresistance,con-

essureagainsttheendofthe oilpressure

heoil passageontheengine.

gLight(fig.5 ).Arubywarninglight

corneroftheinstrumentpanelto indicate

isconnectedtoaswitch-typesendingunit

enthe2 4-voltbatteryswitchisturnedon,

glight willburnuntilthe enginestartsand

etrouble existsintheoilingsystem,allow-

p,thewarninglightwill burn.

Gage(fig.5).The engineoiltem-

onthe instrumentpanelbetweentheoilpres-

s gageismarkedindegreesFahrenheitfrom

hetemperatureoftheengineoil.Thegage is

esistance-typesendingunitmountedonthe

actuatedby thetemperatureoftheengine

indicatetheoiltemperature.

mmeteriscalibratedto ashuntlocated

nd readsdirectlyinamperesona zerocenter

from50to 100oneachsideof thecenter

fiedas negative()totheleftof zero,and

zero.Theamountofcharge(+ )ordis-

atteryisindicatedon themeter,depending

ator,conditionofthebatteries,orthenumber

use.

espeedometerismountedon thelower

panel.It indicatesthespeedofthevehicle

trip mileage.Thespeedometerisdrivenby

pterin thetransmission.

etachometerislocatedonthelower

tpanel.It indicatestherevolutionspermin-

tal revolutionsoftheenginewhentheclutch

erisdrivenbya cablefromanadaptercon-

thetransmission.


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ARYCONDITIONS

SANDCONTROLSINVEHICULAR

Equipment.Beforeanewora recon-

nservice,besure thenewvehiclerun-intest

1,12and13 hasbeenperformed.

ce.Performtheservicesinitems1to 6

emptingtostart theengine.Startandwarm

)andcompletetheBefore-operation

hasstood for6hoursor more,testfor

temptingtostarttheengine.Attemptto

dcrank.Ifthe enginewillnotturn,refer to

verinneutral.

t-offvalvecontrolsonthebulkheadin

yswitch.

out aboutl/zinch.

andleoutslowly,andpushit inbriskly

eengine.Thenumberof strokesrequiredwill

eoftheengine.

dalalltheway down.

chinpositionmarked"BOTH"(fig.5).

s(fig.5) marked"STARTER"and

"ON"positionand holdtheminthis posi-

butfornotlongerthan 10seconds.Ifthe

ethe switchesandallowthecrankingmotor

throttleallthewayout, turnoffthemagneto

hmarked"STARTER."Cranktheengine

inatethepossibilityoffloodingor over-

ostart theengineagain.Aftertheenginehas

rasrequireduntil theenginerunssmoothly.

dal.

minutesat800revolutionsper minute

gage.Theoil pressureshouldbe40pounds.

omeupimmediatelyaftertheenginestarts,or


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yCondition,

Positions

n thegage,stoptheengineand reportthe

ty.CAUTION:Donotrimtheenginewith

peedto1,000 revolutionsperminuteand

pressureremainsat40pounds.If thepres-

eed isincreased,reducethespeedandallow

orethoroughly.

armedup,tryoperatingfirst ononemag-

r,byplacingthemagnetoswitchleverin"R"

UTION:Donotoperatetheengineon one

fthe enginerunsproperlyontheindividual

hinthepositionmarked"BOTH."

tsto seethattheyareindicatingproperly

sequippedwitha governortolimitthe

allgearsasshownon theplateonthe left

permitthevehicleto exceedthesespeeds

toavoiddamagetopowertrain andengine.


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ORWARDMOTION(fig.6).

,releasethe parkingbrake,depress

ntosecondgear.NOTE:Underordinary

soverhard-surfacedroads,startinsecond

evehicleisto beoperatedoverobstacles,

rain,orin confinedareas,startinlow-speed

uallyand,atthe sametime,depressthe

dspeed,releasetheaccelerator,dis-

fttothe thirdgear.

hrougheachshiftto highergears.

fig.6).Depressthelatchbuttonon

verandshifttothe reversegear.Engagethe

esametime,depressthe acceleratorpedal.

E.Releasetheacceleratorandpull

eleversto slowthevehicledowntoabout

theclutchpedalandshiftinto neutral.Kick

rward,andpullthe steeringbrakelevers

holdthevehicle.

e engineisoverheatedorthoroughly

dlefor5 minutesat800revolutionspermin-

elcut-offswitchontheinstrumentpanel.Hold

enginestops,then turnthemagnetoswitch

F."CAUTION:Donotstoptheengine

Shutoffthefuel valvesandopenthe24-volt

theenginespeeddrops below1,800

avoidunnecessarystrainontheengine and

enmakingaturn;shiftto alowergearif

bingorjustaftershifting toahighergear

etoregainspeed,as aslightturnwill reduce

rbeforestartingdowngrade,anddo not

2,400revolutionsperminute.

heclutchwhendriving,exceptduring

theclutchwhilegoingdowngrade, toavoid

e.


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Conditions

utof,atrenchor ditch,selecttheproper

to settlegraduallytothebottomandthen

t.

obstacle,selectthepropergearandapply

atetheclimb;thenallowthevehicleto roll

e.

hicleatmaximumspeedexceptinan

aximumsustainedspeedof21milesperhour.

atless than800revolutionsperminute

s.

ebyturningoffthe magnetoswitch.Press

tuntiltheengine stops;thenturnoffthe

.

arscan beattachedtothetowinglugs

ear ofthevehicle.Ifcablesareused, adriver

brakeleversin thevehiclebeingtowed,to

ehicleas required.

e thatitdoesnot becomefouledwiththe

orethanafewlengths withoutfollowing

edescribedinsubparagraphcbelow.

eatowbar ifthevehicleisto bemoved

.

le.

ovedaconsiderabledistance,blockthe

eceofwoodor removetheboltsfromthe

anionflange,slidetheuniversaljointand

kasfaras possible,andblockthepulley

flange.Placethegearshiftleverinfifthgear

rculationofthelubricantand avoiddamage

aldrive.

ein firstgearandaccelerateuntilboth

ythen,andthenonly,shifttohigherspeeds.

vehicleabove12miles perhour.

SUALCONDITIONS

alcontainsinformationpertainingto the

derconditionswhichinvolvefactorsthatdo

on.


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refertoFM31-25,Desert Operation;

nSnowandExtremeCold.

DSLIPPERYTERRAIN.

Inspectvolutesprings,suspension

pportrollers,pins,wedges,andtrackshoesfor

emoveallmud,ice,orsand whichmightcause

damagetothesuspensionmechanism.

racktensionandadjustslacktoVz to

pportrollers.Makesurethatthetrackidler

areingoodconditionandlockedsecurely.

keTubes.Cleanair cleanersmore

gunderdustyconditions.Inspectallcar-

amps;replacedamagedtubesandclamps.

ed,besurethat theairinletgrille isnot

cationrecordandseethatallpoints

naccordancewiththeLubricationOrder

electthepropergearforthe existing

engineata speedtoinsureasteady pull.

ordancewiththeinstructionplateontheleft

eterasa guideratherthanthespeedometer.

hrubbershoetracks,installthegrousersto

enneeded.

RATION.

asolineprocuredunderU.S. Army

deC)latestissue.Toreducethepossibilityof

nthefuellines,add Vapintofgrade3 dena-

whenfilled.

Fuel.

dandextremechangesintemperature

ltanksandcontainers.Keepthefueltanks

ucetheair spaceontopofthefuel, andto

stureintheair.Drain fueltanksumpsdaily

allcontainersareclean.Beforefilling

ragecontainersthathavebeenmoved,allow

noughso thatanysedimentinthefuel will

all dirt,snow,andicefromandaroundthe

ovingthem.Strainorfilter thefuelwhenfill-


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Conditions

ntainersclosedandavoidexposureto

orhandlingfuel.Fuelflowingover asurface

ywhichwillcauseaspark.Keepthefiller hose

etalliccontactwiththe hullwhenfillingthe

0 engineoilfortemperaturescon-

methodsofkeepingtheengineoil suffi-

tingbelow0F arelistedbelow.Giveprefer-

cordingtoavailablefacilities:

ossible,keepthevehiclein aheated

operation.

entheengineis stopped,drainthe

warmplaceuntil vehicleistobeoperated

ot available,heatoilbeforeinstallingit

TION:Attachatagtothe vehicleinstru-

nelthatthe engineoilingsystemisempty.

eand checktheoillevel.Add2*/2

allon ofoilcontainedinthesystem,immedi-

minutesto mixtheoilandgasoline

movetheoillevelgage.Notethatthe

determinedinstep1 above.Recordthe

containedin thesystemforfuturereference.

einthe oilingsystemwillincreaseoil

checktheoillevel frequently.UseSAE30

oillevelduringoperation.

ed4hoursormoreat operatingtem-

neoil,if itisanticipatedthatthe vehiclewill

more,byfollowingthesameprocedureout-

above.

NALDRIVE.UseSAE30engine

0F.Ifthe transmissionandfinaldrivecon-

AE50),drain theunitimmediatelyafter

ll warm,andrefillwithSAE30engine oil.

LERS,IDLERANDSUSPENSION

intemperaturesbelow0F,useNo.0

ntervalsspecifiedontheLubricationOrder


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IONPOINTS.Uselubricantsspeci-

er(par26).

ostart theenginewhenthebatteries

eraturesbelow30Funtilthe batteries

warmslavebatteriesareavailable.Afully

eezeattemperatureslikelyto beencountered

tadischargedbatterywillfreeze attemper-

yfreezingtemperaturesareshownbelow:

tteriesunlesstheyareimmediatelyputon

eezeon topoftheplates.

atall ignitionwiresaresecureandnot

kplugsfrequentlytoseethattheyare clean

17to0.019-inch.Replaceifnecessary.Test

)beforecrankingtheengine bydepressing

strumentpaneland listeningforabuzzing

e enginewiththemagnetoswitchoff.The

nboostercurrentif thecoilisfunctioning.

,andtightenallcableconnectionsand

rstoseethattheyare dryandproperly

andOperation.

engineoilingsystemhasbeen

heattheengineoil beforefillingthesystem.

oohot;heat onlytothedegreethat thebare

eoilwithoutburning.

ANERS.Removetheengineoilin

withhydraulicoil(U.S.ArmySpecification

om0Fto40F.For operationbelow

eratedry.

eengine,asdescribedin paragraph

edto relievetheloadofturning thetrans-

motor.Keeptheenginecompartmentcover

aturerises.

INENGINEANDTRANSMIS-

ssmoothlyatapproximately1,000revolu-


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myUse

ethegearshiftlever isinneutral,then en-

heengineuntilit isthoroughlywarmedup.

n thetransmissionandcirculatethelubri-

onlubricanthasbeenwarmedsufficientlyto

ears,drivethevehiclein firstgearfora short

bricantin thefinaldrive.Whengearchanges

oceedtooperatethevehiclein theusual

SION.

ytofordstreams,orunexpectedflooding

oahigherlevel,and openallfloordrain

of thetankandcleanoutall mudandsedi-

eathoroughinspectionofwiring,ignition,and

ne,clutch,orelectricalapparatushave

notifyhigherauthority.

ENEMYUSE

ewhensubjecttocaptureor abandon-

ill beundertakenbytheusingarmonly

e militarycommanderconcerned,such

ollowareforinformationonly.Certain

onoutlinedrequireTNTand incendiary

enormalitemsof issue.Theissueofthese

onsunderwhichdestructionwillbeeffected

eachcase,accordingtothetacticalsituation.

to, thevehiclemustbesobadlydam-

toredtoausableconditionin thecombatzone

alization.Adequatedestructionrequiresthat

perationofthevehiclebedestroyedordam-

lyimportant,thesameessentialpartsmust

ehiclessothattheenemycannotconstruct

nitfromseveralpartiallydamagedones.

ONS.

nstructionsapplytothe155-mm

d8-inchHowitzerMotorCarriageT89.


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Gunor8-inchHowitzer.

endiarygrenadesontheirsides,one on

mber.NOTE:Usesixtoeightgrenadesin

nand10to 12grenadesindestroyingthe

breech.Equipanotherincendiarygrenade

fuze,ignite,andtossit inthemuzzle.Quickly

ximumelevation.Elapsedtime:3to5minutes.

enadeswillfuzewiththeinteriorof the

possibletoopenthebreech.

Twomethodsofdestroyingtheve-

ir orderofeffectiveness.

PLOSIVES.

rtablefireextinguishers.Dischargefixed

Puncturethefueltanks.Placea3-poundTNT

rticalfueltank,betweenengineandbulk-

Tchargeagainstleftside oftransmissionas

erttetrylnonelectriccapswithat least5

charge.Ignitethefuzesandtakecover.

terialsare available,additionalde-

ishedbyplacinga2-poundTNTchargeat

ackassembly.Detonatethesechargesinthe

s.

beforehandandcarriedin thevehicle,

paratedfromthe chargesuntilused.

NFIRE.

eportablefireextinguishers.Discharge

ncturethefueltanks.Openalltankdoors

lable.Fireonthevehicle,usingadjacent

illery,orantitankrocketsor grenades.Aim

andarmamentinthe ordernamed.Ifagood

maybe considereddestroyed.

ngvehicleby thebestmeansavailable.


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NCEINSTRUCTIONS

rmationfortheguidanceofthe per-

ationsresponsibleforthe maintenance(first

sequipment.Itcontainsinformationforthe

uledlubricationandpreventivemaintenance

ptionandmaintenanceofthemajorsystems

nsin relationtoothercomponentsofthe

ALTOOLSANDEQUIPMENT

inthissectionis forinformationonly.

sisforrequisition.

ndechelon,special,setA,Tank,medium,M4,75-mm

un(dry)M4A1,76-mmgun(wet);

howitzer,M7;Carrier,cargo,M30;Car-

,M12;Vehicle,tankrecovery,M31;

ndechelon,special,setB,Tank,medium,M4,75-mm

un(dry);M4A1,76-mmgun(wet);

howitzer,M7;Carrier,cargo,M30;Car-

;M12,Vehicle,tankrecovery,M31;

od-

tl

ension,3/g-in.

00SN-F-2B

rcovered,two

1gage,with

8B-257839AB

1265-35TEC-50-29B

1-D-2984MTM-M3-386B

eplacing,power

41-P-555-600

220MTM-M3-165B


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thickness0.006

1/16in... .41-G-412-77

speeder,brace

h17in. ...41-H-1507-95

T-sliding,Vs-in.

41-H-1509-53

269-200

eadcenter,

olestopower

er% in.,

th

-600

ertrainas-

n.,length

-F-2997-220)41-P-647

dleand

42-200

1-P-2219-50

crewtype41-P-2941-800

ranceadjusting.41-S-1725

-3829-50

19

point,complete..41-T-3092-77

attaching,

550

vebodycheck

36-620

eend,double


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olsandEquipment

ool-

ts

nsion,8in.

0SN-L-63

g,22-in41-B-312-200MTM-M3-16L

g,IVs-in.

498-50MTM-M3-16C

1-H-1779-50MTM-M3-16E

nch1-in.sq

-16M

.sqdrive,

M-M3-16J

.sqdrive,

0MTM-M3-16N

.sqdrive,

M-M3-16F

.sqdrive,

TM-M3-16H

.sqdrive,

TM-M3-16K

able),%-in.sq

ze7/16-in.,

99-90IMC-101823B

able),%-in.sq

zeVa-in.,

99-120IMC-101217B

,singleend,octa-

ngl3/s-in.,

MTM-M3-558B

ndechelon,special,setB,supplemental(forvehicles

pringsuspension).'

eplacingsuspen-

kabsorber

emoving41-A-30-650B

s41-B-1411-200B

talsuspension41-L-1616B

innerbogieand

ndouter

384-965B

trackrollers

85-350B

link,pipeca-

ngthI'/g-in.41-W-1781-100TEC-50-54B


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partmentLubricationOrder9-747

irstandsecondechelonlubricationmain-

bricationbelow0F,refertoparagraph20.

edbyordnancemaintenancepersonnelis

uedwith eachitemofmaterieland

times.Intheeventthematerielis received

rmshall immediatelyrequisitionareplace-

tantGeneralDepot.Seelists inFM21-6.

cationOrderarebindingon allechelons

shallbeno deviations.

edontheLubricationOrderarefor

nsduringactiveserviceabove0F.These

nderextremeconditionssuchasexcessively

prolongedperiodsofhigh-speedoperation,

dordust,immersionin water,orexposure

chmayquicklydestroythe protective

alendarintervalsmaybeextendedwhen

edinthe"Key"in accordancewiththree

ve+32F,+32Fto0F,andbelow0F.

ubricantsis determinedbymaintaininga

ofthematerielduringthe approachtochange-

uringinitialaction.Sluggishstartingisan

ckening,andthesignaltochangetogrades

ertemperaturerange.Ordinarilyitwill be

esoflubricantsonlywhenairtemperatures

thigheror lowerrange.

ONINSTRUCTIONS.

Eachpieceofmaterielissupplied

tadequatetomaintainthemateriel.This

bothbeforeandafteruse. Lubricationguns

andinsucha mannerastoinsurea proper

t.

easecups,oilers,andoilholesarereadily

eLubricationOrder.Wipethesedevicesand


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leanbeforelubricantisapplied.

provided,applynewlubricantuntil

om thevent.Exceptionsarespecifiedin

rder.

solventordieselfueloilwill beusedto

ofgasolineforthispurposeis prohibited.

ethoroughlydriedbeforeapplyinglubricant

orenote).

ividualUnitsandParts (figs.7and

EATHERS.

eservoirtobeadlevel.Every500miles,

Replaceandrefill.

andreoil theelementsofthecrankcase

sion,differential,andfinaldrivebreatherat

LubricationOrder.Drainexcessoilthor-

BBEARINGS.Whentheengine

ackbearings.

ARING.Whentheengineisremoved,

,andlubricate.Replaceplugafterlubricating.

beforeoperation,checkthelevelwith

d,ifnecessary,addlubricantto thefull

ssionfillertomarkon bayonetgagewith

pipe.Every3,000miles,drain andrefill.

whengearlubricantis warm.Thetrans-

naldrivesarecombinedinoneunit. Drain

erentialandfinaldrivedrainplugholes. To

ssionlubricationsystem,alsoremoveoilcooler

cklevelbeforeoperation.Every500

nonly afteroperationwhenoilishot. Refill

e locatedunderfillcap.

achuse,cleanandoil.Weekly,ifcable

tercoils.Monthly,unwindentire cable,clean

ANDPLUNGER.Tolubricate,place

,unscrewcoverfromfrontofequilibrator,and

case.Wipeall surfacesandapplyathin

osedpartsincludingoutersurfaceofboth

ECHANISM.Immediatelyafter

vedaysthereafter,disassemblethegascheck


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ndleandclean allpartsofthe breechand

thegascheckpad,withbore-spongingsolu-

r,drythoroughly,andapplya filmofoil.

beingfired,cleanwithdry-cleaningsolvent,

assembled,thegascheckpadwill bewiped

ningsolventorbore-spongingsolution).

(SAE30)orSAE10 foralltemperatures

nanddry.

g,whilethetubeis stillhot,swabwith

onsistingofVipoundofsoda-ashto each

ethoroughlywithcleanwater,wipethor-

m ofoil.Thegunwill notbeallowedtore-

eaning.Repeatthisprocedureon3 con-

runtilthereis nolongerevidenceofsweating.

otbeingfired,wipethebore cleanand

days,swabwithdry-cleaningsolvent,wipe

atedoorhingesand latches,control

pinsandclevises,clutchandaccelerator

earings,seatslidesand supports,cable

dearmlinkage,andpintle.

wheelhandlesandotherrubbingparts.

OLUBRICATION.Donotlubricate

nkageandslides,finaldrivesprocketbear-

w-outyokebearings.

DPERIODICALLYBYORD-

sembledforrepairoroverhaul,clean

ballandroller bearinggrease.

sembledforrepairoroverhaul,clean

ballandroller bearinggrease.

ings.Every6months,disassemble,

peciallubricatinggrease.

gs.Every6months,disassemble,clean,

ubricatinggrease.

y6months,disessemble,washallparts,

pistonrodthreads,andcylinderheadthreads

ease.


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Services

very6months,removegearhousing

ewithgeneralpurposegrease.

wheelShaftBearing.Whendisas-

overhaul,cleanandrepackwithspecial

ShaftLowerBearing.Whentravers-

bledforinspectionandoverhaul,cleanandre-

iallubricatinggrease.

Whendisassembledforinspectionor

rythoroughly,andrepackrollerbearings

ftand ballbearingsofthebrakedrum gear

nggrease.Applythinfilmof No.0general

teethandthebrakeshoeguidebushings,

excesslubricantthatmightreachthebrake

ase groovesinclutchmechanismwith

performanceofmaterieltotheOrd-

formaintenanceinaccordancewithTM

maybe maintainedintheDutyRoster

.

CESERVICES

N.

val.Preventivemaintenanceserv-

0-15are afunctionofusingorganization

,andtheirperformanceistheresponsibility

horganizations.Theseservicesconsistgen-

halt,after-operation,andweeklyservices

dthescheduledservicestobe performedat

ganizationalmaintenancepersonnel.

generalinspectionofeachitem

ngmemberor connection,andisgenerally

item isingoodcondition,correctlyassem-

lyworn.

dcondition"isusuallyan externalvisual

hethertheunitisdamagedbeyondsafeor

m"goodcondition"isexplainedfurtherby


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wisted,not chafedorburned,notbroken

yed,notdentedor collapsed,nottornorcut,

toseethatit is"correctlyassembled"is

nspectiontoseewhetherit isinits normal

vehicle.

todetermineifitis "secure"isusually

ation;awrench,hand-feel,orapry-bar

aninspectionmustincludeanybrackets,

ckingwires,orcotterpinsusedin assembly.

beunderstoodtomeanwornbeyond

oint likelytoresultin failureiftheunitis

xtscheduledinspection.

(FIRSTECHELON)

hanicalefficiencyitisnecessarythat

allyinspectedatintervalseachdayitis op-

ectsmaybediscoveredandcorrectedbefore

geor failure.Certainscheduledmaintenance

atthesedesignatedintervals.Anydefects

gcharacteristicsbeyondthescopeoffirst

ereportedatthe earliestopportunitytothe

thority.Theservicessetforthin paragraphs

seperformedbythecrewbeforeoperation,

ndafteroperationand weekly.

Driverpreventivemaintenance

ackof "Driver'sTripTicketandPreventive

ord"W.D.,FormNo.48,tocovervehiclesof

speculiarto thisvehiclebutnotlistedon

veredinmanualproceduresundertheitems

d.Certainitemslistedon theformthatdo

areeliminatedfromtheproceduresaswritten

anizationmustthoroughlyschooleachcrew

anceproceduressetforthinthis manual,

ecificallyonW.D.,FormNo.48or not.The

No.48 thatapplytothisvehicleare ex-

providespecificproceduresforaccomplish-

dservices.Theservicesarearrangedto

onservethetimeofthecrewandare not

mericalorderasshownon W.D.,FormNo.

wever,areidenticalwiththoseshownon

ERVICE.

nscheduleisdesignedprimarilyasa

lehas notbeendamaged,tamperedwith,or


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Services

r-operationService"wasperformed.Various

averenderedthevehicleunsafeforoperation

wto determinewhetherthevehicleisin

missionto whichitisassigned.Thisopera-

mitted,eveninextremetacticalsituations.

erationServiceconsistsofinspecting

ngtotheproceduredescribed,andcorrecting

es.Uponcompletionoftheservice,results

othe designatedindividualinauthority.

DDAMAGE.Examineentire

ntandarmament,foranydamagethatmay

debris,shellfire,sabotageorcollisionsince

ineandfightingcompartmentsforabove

tedwiringorcontrollinkage,loosedrive

HERS.Examinevisiblefixedex-

sin enginecompartmentforsecurity,dam-

heckportableandfixedextinguishercylin-

curityandfullcharge.

Checksupplyoffuel andoillevel

ve;add asnecessary.Checkoillevelin

correctlevelif necessary.Anyappreciable

-operationServiceshouldbeinvestigated

ANDDRIVES.Inspectcarburetor,

andblowerunitforloosenessor damage.Be

arein goodconditionandadjustedtohave

lection.

RAL.Checkundervehicleandin

nyindicationsoffueloroil leaks.Inspect

ngs,oilfilter,visibleportionsofoilcoolersand

tionsofleaks.Traceallleaksto theirsource

.

neis beingstarted,observeif

orilyandinspectforlooselinesorbrackets

UP.Testforhydrostaticlockby

nimumtest50revolutionswithhandcrank).

tchandfuel valvesandstartengine.Note

sm,particularlywhetherstarterhasadequate

esanddisengagesproperlywithoutunusual

indicatedimmediately,stopengineandcor-

and throttlesoenginewillidle at800revolu-


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rm-up,seethatthrottle operatesfreelyand

gBefore-operationServices.

neoil pressuremustbeindicated

40to70poundsat 1,800to2,400revolutions

mediatelywhen"lowoil"redlight comeson.

ermayshowhighchargeuntilgen-

erythe currentusedinstartingthe engine;

ghtchargeor zerowithlightsandacces-

utionCounter.Tachometershould

sperminuteandrevolutioncountershould

olutions.

eGage.Operatingtemperatureas

exceed190F andshouldshow100to120F

registeramountof fuelintanks.Use

eamountoffuelin eachtank.Normally,

perationandgageshouldregisterfull.

NDSHIELDWIPERS.Iftactical

nforproper operationandtone.Whenused,

rmstosee thattheyarein goodcondition

otorsandobserveif thebladesoperate

dcontactsurfacesevenly.

nallvisiondeviceglass andinspect

nalllights andexamineforloose-

alsituationpermits,operateallswitchesand

atisfactorily.

DFLANGENUTS.Seethatalldrive

ewheelandsupportrollerassemblyand

andsecure.

DTIRES.Whileinspectingtracks

nections,removeallstonesandforeignob-

sandtracksandwheelsandrollers.See that

wheeltiresare ingoodconditionandcheck

equippedwithhorizontalvolutesprings,

ntrackbetweenidlerwheelsandrearsus-

nthesprocketandforwardsuspensionwheels.

DSUSPENSIONS.Examineto

all bogiesuspensionunitsareingood con-

cleswithhorizontalsuspension,seethat

eandnotleaking.


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Services

BRAKELINKAGE.Inspectlinkage

connectionsandmountingsandfreeopera-

whethertheymeetresistanceevenly,

ition.Leversreleasedarecorrectlyposi-

distancefromfaceofbrakedrumhousing

is7to 71/2inches.

specttoseethat fendersareingood

ounted.

NNECTIONS.Seethattowloops

ecurelyshackled.Inspectpintlehookfor

ountingandproperoperation.

,WINCHANDTARPAULIN.In-

kenwelds,looseattachmentsandproper

escapehatches.Examinewinchcables,

at theyareingoodconditionandsecurely

ecurelylockedifin raisedposition.Ifin

sare properlymountedandtarpaulinse-

e,tarpaulinmustbesecurelystowed.

NATORS.Examinedecontami-

llchargeandsecuremountings.

EQUIPMENT.Checktoolsand

temsarepresent,ingoodcondition,and

ed.

RATION.Engineshouldidle

nsperminute.Accelerateengineseveraltimes

temperature,(8)(d) above,andnoteany

ctoryoperatingcharacteristics,orexcessive

RMIT,FORMNO.26.Driver

ermitonhis person.Accident-ReportForm

bricationOrderandWJD.,A.G.O.FormNo.

bleandsafelystowed.

ERVICE.

hicleisinmotion,listenfor any

ocks,squeals,orhumsthatmay indicate

omanypartofthe vehicle.Bealertforodors

mponentsorunits(such asgenerator,brakes,

emor exhaustsystem,orothertrouble.

arsshifted,orthe vehicleturned,consider

satisfactoryorunusualperformance.Watch

yforunusualbehaviorindicatingpossible

htheyapply.


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erationServicesconsistofobserving

ngtotheproceduresfollowingeachitem,

cationsofserioustrouble.Noteminorde-

orreportedatearliestopportunity,usually

AKES.Withvehicleinmotion,

dently.Observeifthereisnormalresponse

evertravel.Disengageclutch,applyboth

esstopvehicleeffectively,meetingresistance

ition.

KE.Stopvehicleonar easonable

rakelocktosee ifbrakesholdsatisfactorily

relyinthe appliedposition.

chreleasemechanismshouldop-

sivenoise.Clutchshouldnotgrab,chatteror

andshouldnotslipunder loadwhenfully

shouldbemaintainedatapproximately

N.Transmissionshouldshiftinto

outunusualnoise andshouldnotslipout of

eonthealert foranyunusualnoiseduring

ONTROLS.Drivershouldbeon

engineperformancesuchaslackof power

g,backfiring,unusualnoiseor indicationof

smoke.Observewhetherornotengineac-

dcontrolsoperatewithoutexcessiveloose-

oiseduringoperationofvehicleisreported,

adiooperatorinlocatingthe interference.

TS.Observethereadingsofallperti-

tlyduringoperation,toseewhethertheyare

ofunitstowhichtheyapply,and that

hiclespeedandrecordsaccumulatingmileage.

R.Listenforanyunusual noise

s,bogiewheelsandfinaldrivesthatmight

ge,excessivewearorinadequatelubrication.

vicesmayberegardedasminimum

andshouldbeperformedunderall tactical

oreextensivemaintenanceservicesmustbe

her.

vicesconsistofinvestigatinganyde-


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Services

eration,inspectingitemslistedbelowac-

followingtheitems,andcorrectingany

enciesnotcorrectedshouldbereported

dindividualinauthority.

SUPPLY.Makesurethat there

operatevehicletonextscheduledstop;re-

calsituationpermits.

ES(HUBS,TRANSMISSION,

SOEQUIPPED,SHOCKABSORB-

lyoneachtrackwheelandtracksupport

theyareabnormallyhot.Ifwheelhubsare

and,bearingsmaybeinadequatelylubri-

perlyadjusted.Checkthetransmissionand

gorexcessiveoilleaks.Onvehiclesequipped

ension,shockabsorbersshouldfeelwarm.

ot becomewarmwhenthevehicleisbeing

that thefluidislow ortheshockabsorberis

neventsoftransmissionandfinal

epresentandnotdamagedorclogged.

SUSPENSIONS.Inspectthese

age.Removestonesandotherforeignobjects

ystemorbetweentracks.

AKELINKAGE.Inspectlinkage

ndinvestigateanyirregularitiesnotedduring

LANGENUTS.Seethatall

heelandsupportroller assemblyand

andsecure.

minetracks,bogiewheels,tiresand

secureandnotdamaged.Makesurethat

y.Cleanoutstonesandtrashfrom track

ERAL.Inspectgenerallyforindi-

ks.Seewhetherthereareanyindicationsof

oil cooler,filterorlines.Traceanyleaksto

reportthem.

SANDBELTS.Examineengineac-

chmentstobesuretheyaresecure,properly

rivebeltsare ingoodconditionandtension

haveViinchdeflectionundernormalfinger

sedbyoperationof theenginewasobserved,

sandcouplingringsand nuts;engine,regu-


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ndingstrapsandregulator filtersfordam-

sandmountings.

RS.Whenoperatingunderex-

nditions,inspectaircleanersandbreather

attheyarein conditiontodelivercleanair

ed.

spectfendersforgoodconditionand

NNECTIONS.Inspectpintlehook

mountingandproperoperation.

,WINCHANDTARPAULIN.

mageorlooseattachments.Ifin use,besure

d,orif notinuse,securelystowed.

nallvisiondevicesand lightlenses;

mageandsecurity.

DWEEKLYSERVICE.

onservicingisparticularlyimportant

ewinspectsthe vehicletodetectanyde-

eveloped,andtocorrectthosetheyareper-

uldpromptlyreportresultsof theinspection

alinauthority.If thisscheduleisperformed

ouldbereadytoroll againonamoment's

tionService,withfewexceptions,isthen

nwhetherthevehicleisin thesamecondi-

oncompletionoftheAfter-operationService.

ceshouldneverbeentirelyomitted,evenin

s,butmaybereducedtothebare fundamental

-haltService,ifnecessary.

ormingtheAfter-operationService

andconsideranyirregularitiesnoticedinthe

operation,andAt-haltServices.TheAfter-

sofinspectingandservicingthefollowing

fter-operationServicethataremarkedby

ditionalWeeklyServices,theproceduresfor

paragraph(b)ofeachapplicableitem.

ATION.Accelerateanddecelerate

ndencytomiss orbackfireoranyunusual

htindicatewornparts, loosemountings,

ultyignition.Investigateanydeficiencies

dcorrectorreportsame.

S.Checkallpertinentinstruments

ingproperlyandcontinuetoregisteror in-


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Services

ceofunitstowhichtheyapply.Inspectthem

Stopengine.

SUPPLY.Refillbothfuel tanks.

pplytank andfilltocorrectlevel.CAU-

ltankstooverflowing;allowroomfor ex-

or oilusedfromsparesupplycansi sre-

NDSHIELDWIPERS.Iftactical

nforproper operationandtone.Ifinuse, see

erateproperlyandinspectbladesandarms

urity.

allvision devicesandinspectfor

all lightlensesandexaminefor

ofmounting.Turnonswitchesto seethatall

ISHERS.Inspectvisiblelines

rs,fixedand portable,toseethattheyare

ndnotleaking.If extinguishershavebeen

ortforexchangeorrefill.

ATORS.Inspectdecontaminators

fmounting.

ksor damageandsecurityofmounting

sandcarrierandinspectfor looseor

minalsarecorroded,remove,cleanandapply

cleanwatertobringlevelto Vainchabove

ngtemperatures,donotaddwateruntil

eoperated.

ORIES.

temsinenginecompartmentand

eyareingoodcondition,cleanandsecure.

ttension;theyshouldhaveVa-inchfinger

essibleunitsmountedonengineac-

s,damageandoilleaksatmountingpads.

shfrominandaroundoil coolercoreair

RING.Examineconduitsfor

htenalllooseconnectionsandcleanallacces-

dionoisesuppressionbondclips,straps,filters,


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orsaresecurelyconnectedormounted(pars.

conduitcouplingring nuts.

RSANDBREATHERCAP.In-

erandbreathercapareingoodcondition,se-

ected.Examineforexcessivedirtandproper

cessary,accordingtoparagraphs26and 27

.Inspecttoseethat mainfuel

king.(Thefilterlocationissuchthat com-

eonlyafterenginehas beenremoved.)

TROLS.Inspectaccelerator,hand

ontrolsforexcessivewearanddisconnected

DTIRES.Examinetracksfordam-

eorwornconnections.Removeallstonesor

eenblocksandtracksandwheelsandrollers.

pensionwheeltiresto seethattheyarenot

heels.Inspecttracksforlooselockpinsand

,thereshouldbenotrackbulgebetweenthe

ensionwheelsandbetweenthe sprockets

heels.CAUTION:Donotadjusttrackson

rizontalvolutespringstootight.

DSUSPENSION.Inspectvolute

eingoodconditionandproperlyassembled.

are secureandthatsupportandsuspension

excessivelyworn.Examineshockabsorbers

bushingsorleaks.

RAKELINKAGE.Inspectlevers,

rgoodcondition,security,adequatelubrica-

vestigateanyunsatisfactoryperformance

Steeringleversshouldhave1to 4Viinches

stanceslightlybeforethe verticalposition.

flevers.Leversarecorrectlypositionedwhen

aceofbrakedrumhousingcoverstofront

nches.

SHAFT(WEEKLYONLY).Ex-

ointsto seethattheyarein goodcondition,

ot leaking.

ndfinaldriveventsto seethattheyare

ndnotclogged.

s,cleanthoroughlyandinstallse-


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Services

ERAL.Inspectallfuelandoil

coolers,transmissionandfinaldrive forindi-

eaksfoundtotheir sourceandcorrector

spectfenderstobesure theyare

damaged.

ONNECTIONS.Besuretowingloops

ecurelyshackled.Examinepintlehookfor

operation.

P,WINCHANDTARPAULIN.Ex-

sor looseattachments.Testactionofspade

itoperatesproperly.Inspectwinchcable

ands.When rampisinloweredposition,be

oundsecurely.Whenrampisin raisedpo-

curely.Examinetarpaulinandbowstosee

ditionandstowthemproperly.

minearmor,andgunmountshields

atwouldrendervehicleunsafefor combat

CES.Inspecttheperiscopeprisms

eyare ingoodcondition,cleanandsecurein

sshouldbecleanedonlywithasoftcloth

TING,ELEVATINGANDTRAV-

ethatgun issecureonitsmount,clean,

onforimmediateuse.Testgunelevating

orproperoperation.Besurethattraversing

ditionandoperatessatisfactorily.Corrector

orityanydeficienciesnoticedduringoperation.

ngsandassemblynuts orscrews

atedthenecessity.

ketandidlerflangenuts,trackcon-

saljointflange,gunmounts,toolandequip-

tionracksandclipsoranyotheritemwhere

ndicatedthenecessityonaweeklyormileage

ION.

tchhinges andlockingdevices,com-

atches,towshacklesandanyotherpoint

nhasindicatedthatitis necessary.


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s

ointsofthevehicleindicatedon the

ssaryonaweeklybasis.

INEANDVEHICLE.

casingsandrefusefrom interiorof

drippingsfromdrivingcompartment,and

moveexcessdirt,stonesandgreasefrom

ethatenginecompartmentgrillesareclear

ofvehicleandremovealldirt and

cal,wipeascleanas possibleandwatchfor

seglare.Openenginecompartmentand

compressedairisavailable,blowalldirt

andoil coolercoreairpassages.

DEQUIPMENT.

dequipmentstowagelists,sectionIII,

esentandseethat theyareinserviceablecon-

ormounted.

dequipment;mountorstowsecurely

vehicle.

NTENANCE

ncyofpreventivemaintenanceserv-

ideredaminimumrequirementfornormal

erunusualoperatingconditionssuchas

everedust,sandyorextremelywetterrain,it

rmcertainmaintenanceservicesmore

on.Thecrewshouldaccompany

mechanicswhileperiodicsecondechelon

servicesareperformed.Ordinarilythevehicle

cheduledpreventivemaintenanceservicein

on;thatis,itshould bedry,andnotcaked

hanextentthatinspectionandservicingwill

owever,thevehicleshouldnotbewashedor

ecausecertaintypesofdefects,suchascracks,

parts orassemblies,aremoreevidentifthe

ordusty.

ormation.Ifinstructionsotherthan

eralproceduresinsubparagraphd,or the

paragrapht,whichfollow,arerequiredfor

reventivemaintenanceserviceorforcorrec-

aybesecuredfromother sectionsofthis

atedindividualinauthority.


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Services

esegeneralproceduresarebasicin-

ollowedwhenperformingtheserviceson the

cprocedures.NOTE:Thesecondechelon

ghlytrainedintheseproceduresso thatthey

ally.

edsubassembliesareinstalledto correct

etakentoseethatthey areclean,correctly

ricatedandadjusted.

ricantretainerseals,a coatingofthe

overthesealingsurfaceof thelipofthe

aleatherseal,itshould besoakedinSAE10

utes.Theoilshouldbewarm,if practicable.

be workedcarefullybyhandbeforeinstall-

notbescratchedormarred.

ertoparagraph28 b.

areindicatedbyrepeatingtheitem

hichshowtheintervalat whichtheservices

owthat thepartsorassembliesareto receive

es.Forexample,anitemnumberinoneor

GHTENprocedure,meansthattheactual

stbe performed.Thespecialservices

ssaryadjustmentsinaccordancewith

smanual,specialbulletins,or othercurrent

hevehiclewithdry-cleaningsolventto

dirt,andotherforeignmaterial.Afterthe

emin cleansolventanddrythemthoroughly.

s cleanuntilreassembledandbecertainto

ayfromrubberorothermaterialwhichit

tectivegreasecoatingfromnewpartssince

agoodlubricant.

Thisappliesbothto lubrication

earon thevehicleLubricationOrderandto

heOrder,butwhichshouldbeperformedin

enanceoperationsifpartshavetobedisas-

ervice.

nsistsofperformingspecialoperations,

rywater,drainingandrefillingunits withoil,

heoilfilter, aircleaner,orcartridges.

ngoperationsshouldbeperformedwith

forceonthewrenchhandle)totightenthe

chanicalpractice.Useatorque-indicating

Donotovertighten,asthismaystripthreads


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ningwillalwaysbeunderstoodtoinclude

ockwashers,locknuts,lockwire,orcotter

etightening.

enconditionsmakeitdifficulttoper-

enanceproceduresatonetime,theycan

ections,planningtocompletealloperations

Allavailabletime athaltsandin bivouac

ecessary,toassurethatmaintenanceopera-

ntimeislimitedby thetacticalsituation,

sinthecolumnsshouldbe givenfirstcon-

rsofthe preventivemaintenancepro-

nticalwiththoseoutlinedon WJD.,A.G.O.

"PreventiveMaintenanceServiceWork

nk-likeWheeledVehicles."Certainitems

notapplytothisvehicleare notincluded

manual.Ingeneral,thenumericalsequenceof

followedinthemanualprocedures,butin

viationforconservationofthemechanic's

eproceduresforperformingeachitem

hlymaintenanceprocedures,aredescribed

hpageofthe charthastwocolumnsatits

themonthlyandthe semimonthlymain-

ryoftenitwillbefoundthata particularpro-

oth scheduledmaintenances.Inorderto de-

tofollow,lookdownthecolumncorrespond-

e,andwhereveranitem numberappears,

icatedoppositethenumber.NOTE:Those

nasterisk(* )requireadditionalservicesat

on.

tuationdoesnotpermita

eitemswhichrequire little

evehicle.Whenaroad testispos-

blyfor3miles,butnot over5

VICE.PerformtheBe-

outlinedinparagraph29.

ES.Checktheseitemsas

oilpressuremust beindicated

40 to70poundsat1,800 to


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Services

ute.Continuetoobserveoil

tvariousspeedranges.Stop

"LOWOIL"redlightcomeson.

age.Gagereadingshouldin-

ginewarm-upandshouldnot

ouldnotbemovedbeforeoil

0F.

rgedbattery,ammeterread-

efor onlyashorttimeafter

tlyabovezerowithall lights

sturnedoff.Ifbatterycharge

tehigherchargefora longer

eter.Inspectspeedometerfor

ng,excessivefluctuationof

ethatodometerregisters

s.

onCounter.Inspecttachometer

texcessivehandfluctuationor

volutioncounterregisters

s.

orswitchtoboth"R"and"L"

etherfuelgageindicatesapproxi-

htank.

LDWIPERANDSIREN.

pectassemblyandwipersto

conditionandsecure,andthat

htheirfullstrokeand contact

foroperationandtone,and

andsecuremounting.

PARKING,LEVERS,

EERINGACTION).

backonsteeringbrakelevers.

sted,leversshouldmeetheavy

averticalposition.Accelerate

ed,releaseacceleratoranddis-

steeringbrakes,andobserve

cleproperly.Applysteering

eethattheysteervehicle

akelockwithvehiclestopped

ouldholdvehicleeffectively,

dposition.Observereleased


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Leversarecorrectlypositioned

romfaceofbrakedrumhous-

everis7to 7Viinches.

RAG,NOISE,GRAB,

pedalforcorrectfree

nches(par.986).Clutch

dengagewithoutunusualnoise,

hforslippageunderload, when

TION,VIBRATION

eachspeedrangeoftrans-

rcontrolleveroperatesproperly

unusualvibrationsor noise

ightindicatedamage,excessive

mproperlubrication.

ATION,POWER,NOISE,

PTION).

ped,observeifengineruns

peedof500 revolutionsper

est,observewhetherthereis

stallwhenacceleratorisre-

osed.

tionandNoise.Testengine

dpullingpowerineach

inhigh range,accelerateengine

penthrottleto topspeedand

oise,ping,or vibrationthat

aged,excessivelyworn,orinade-

partsoraccessories.Governed

proximately2400revolutions

st,lookfor excessivesmoke

mpartment.

pletionofroadtest,acheck

nginehasbeenconsumingan

LERSHAFTSAND

SPROCKETS,IDLERS,

ROLLERSAND

, listenforanyunusualnoise

oneditemsindicatingdamaged,

inadequatelubrication.

MISSION,DIFFEREN-

ND,WHENSO

BERS).Placehandcau-


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Servicei

elandtracksupportroller hub

normallyhot.If wheelhubs

hehand,bearingsmaybeinade-

gedorimproperlyadjusted.

dfinaldrivesforoverheatingor

absorbersshouldfeelwarm.If

tbecomewarmwhenthevehicle

ndicationthatthefluidis low

t functioning.

AVERSINGMECHA-

hitsfull rangeandcheck

,orerraticaction.Testgun

theyoperateand allmecha-

UEL).Lookinengine

ehicleforindicationsofoilor

bleoillines andconnections

ENGINE,MOUNT-

UTCHANDEXHAUST).

celeratingengine,listenfor

accessories.Noticewhether

nthatmayindicatelooseengine

ayindicatelooseor inade-

partsorreleasebearings.

tracksforsatisfactoryten-

ckbulge betweenidlewheels

heelsandthe sprocketandthe

s.CAUTION:Donotadjust

izontalvolutespringstoo

NS

fuelpumptestgageto

withengine runningatidling

rthepressureiswithinthe

ately3Vipounds(par.73).

GUARDS,PAINTAND

LSANDPINTLEAND

ordamagetosidearmor,

hellfireor collision;checkfor

torbright spotsinpaintthat

eethatallvehiclemarkingsare


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hacklesandpintletoseethat

and securelymounted.Test

ndtone.

EHATCH,INSPEC-

LUGS).Inspecthull

atescapehatchlatchoperates

ylubricatedandseethat all

a fewdropsofoilto escape

Donotfullyopenescape

LDRIVES.Inspecthous-

goodconditionandnot leak-

Seethatallassemblyand

.NOTE://changeoflubri-

lwithspecifiedoilatthis time.

alassemblyandmounting

CONNECTORS,AND

oseethattheseitemsare in

assembled,andsecure.Pay

econnectors;bottomed

Tightenwedgenuts.

ksare disconnectedand

ets,supportrollers,andidlers,or

tenanceservice,therelated

byanasterisk(*)on thePre-

viceWorkSheet,W.D.,A.G.O.

spectedasdescribedbelowin

edures.Ontheregularsemi-

enanceservicesthetracks

essrepairsare needed.CAU-

eremovedforrepairorre-

ltracksuntiltheservicesfol-

items22and25 havebeen

UIDEPLATES,AD-

TSANDSPRINGS).

hat theyareingoodcondition,

ure,andthatgreaseisnotleak-

elbearingseals.Besureadjust-

nutaresecure.Tightenall

oltsandnutssecurely.

bove,at eachthirdmonthly

heneverthetracksareremoved

dlerhub bearingsforlooseness


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Services

wheelsandlistenforany

dicateadamaged,excessively

catedbearing.

NKS,GUDGEONS,COL-

TESPRINGSAND

ARINGPLATES).Inspect

eingoodcondition,correctly

dthatgudgeons,collars,guides

excessivelyworn.Note

vetakenapermanentset(9

ts).Thoseconditionswillbe

eplacement(par.123).

blyandmountingnutsor

ANDSKIDS).Inspect

eyareingoodcondition,correct-

ymounted.Payparticularatten-

hasnotseparatedfrom rim

tornorexcessivelyworn.In-

antleaksfrombearings.

xaminebearingsforlooseness

andlisten foranyunusualnoise.

untingboltssecurely.

H,ANDNUTS).Examine

are ingoodcondition,correctly

mounted.Inspectsprocketteeth

aftflangegaskets,oroil sealsfor

Ifsprocketteethareexcessively

eplacedorreversed.Tighten

oltssecurely.

bove,at eachthirdmonthly

etrackisdisconnectedandre-

checkthesprocketteethfor

atsprocketsaresecure.Check

forloosenessandend play.

e,reinstallthetracksandcon-

tracksforsatisfactoryten-

ckbulge betweentheidler

nwheelsandbetweenthe

suspensionwheels.CAUTION:

ht onvehiclesequippedwith

CH,DECK,PAINTAND

ORS,HATCHES,


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AMAST).Inspectthese

ngoodconditionandsecure.

andhatchhinges andlatches

xcessivelyworn,andareade-

atgrillesarenot obstructed.

es andlowerstherampand

mpextensionslidesfreelyand

operly.Examinewinchcables

ands,and cablesheavesand

ntandoperation.Examine

shedsurfacesthatmaycause

hiclemarkingsarelegible.

LTANK).Inspecttosee

odcondition,secureandnot

reinplaceand serviceable.

NREQUIRED).Remove

nanceservice,onlyifinspec-

3,and14,and acheckofrecords

eddefiniteneed.

gnetosaregroundedwhen

gineanddrythoroughly,tak-

ngsolventawayfromelectrical

dequipment.

RANCE,LUBRICA-

DPUSHRODHOUS-

31onlywhenengineis

.Adjustvalveclearanceto

ctvalvetappets,rockerarms

gstosee thattheyareingood

mbled,andsecureandthat oil

dshaftsproperly.Inspectrocker

ivewearandrockerarmrollers

erboxcoversto seethatthey

asketsare serviceable.See

condition.

parkplugs.Examineinsu-

andelectrodesforexcessive

ustand/orreplaceplugswith

0.019inch.Besuretoinstall

er-tightenplugs.

NGMOTOR.Inspect

eyareingoodconditionand

surewiringconnectionsare


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Services

drivebeltstoseethat theyare

erlyadjustedto haveV2inch

n.

torinspectioncoversand

seethattheyareingood condi-

ree inbrushholders,clean,

thatbrushconnectionsare

ot brokenorchafing.Clean

ratorandstarterbyblowing

ghtenstarterandgenerator

netosareingoodcondition

dnotewhetherthereisevidence

adgaskets.Removebreaker

seethatpointsare notpitted,

th matingsurfacesandare

eakerpointgapsto0.008to

kandsetignitiontiming

nparagraph64c(3).

NDUITS.Inspectall

s,particularlyradionoisesup-

agnetostosparkplugsand in-

hieldingisin goodcondition,

elyconnectedandsupported

otherparts.Wipeallexposed

h.NOTE:Do notdisturb

lyloose.

oostercoilandconduitsto

condition,cleanandsecurely

P,OILSCREENSAND

CRANKCASE,FUEL

DCONTROLLINK-

eseitems areingoodcon-

oil isnotleakingfromoil

ssorycaseorcrankcase.Inspect

ks.Removeoilpumpscreens,

ry-cleaningsolvent,dry,and

Order(par.26and27).

e enginesump.Tighten

dmountingboltsandscrewsse-


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76/274

Services

theseitemsare ingood

yassembled,andsecurely

inspectioncoversareallin

siblemountingandassembly

eethatcowlingandshrouds

not interferewithfan.

oseenginesthatare re-

clutch,cleanpartsthoroughly,

wearordamage.Ifanypart is

ditiontohigherechelon.

ectgeneratordrivebelts

dcondition.Seethatdrivebelts

and notbottominginthe

ratordrivebelttohave Va-inch

ger-pressure.

ULKHEADAND

ktoseethatengine

bulkhead,isin goodcondition

linkageinengine compart-

andsecurelyconnectedand

partmentthoroughly.

ER,LINESANDFIT-

thesei temsareingood

mbled,securelymountedand

andinspectsampleofoil on

dilution.Seethatfillercapand

onandseal properly.

PUMP).Inspectto see

sible)arein goodcondition,

urelymountedandnotleaking.

mpty,drainwaterandsedi-

yremovingdrainplugs and

all fueltankmountingsand

eriorfuelfiltertoseethat

ureandnotleaking.

ltanksand removefuel

d,withoutdisassembling,clean

ent.Dryandinspectfordam-

ble,reinstall;ifelementis not


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efilterassembly.Tightendrain

urely.

ctoilfiltertosee that

ureandnotleaking.Remove

gnut,operateengineandob-

ating.

oilfiltercoverandelementand,

eanthemindry-cleaningsol-

eitemsfor damage.Ifelement

entirefilterassembly.

ER.Inspectcoreand

heyarein goodcondition,se-

noutinsectsandtrash fromin

es.

oseethattheseitemsare

yassembledandmountedand

ingboltsandconnections

minetoseethatmount-

andsecure.

ingboltssecurely.When

nsupportringto crankcasebolts

mblybolts.

HOES,LINKAGE

thesepartsofclutch

yarein goodcondition,cor-

andnotexcessivelyworn.See

bricatedandthatreleaseshoes

ar.98).

sibleassemblyandmounting

henengineisremoved,per-

engineisreinstalled.

EM(TANKS,

ANDMOUNTINGS).

fbothfixedandportableex-

yare ingoodconditionandse-

ot cloggedorvalvescorroded.

OUNTINGS,LINES

ONTROLLINKAGE

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atthistime(paragraph51).

elyandproperlyconnectall

ndlinkage.

D-DOWNS,CARRIER,

Removebatteriesand

ailable,anddrythoroughly.

hold-downclampsforgood

arrierwithsodasolution,and

tteryterminalsandscrape

tly.Checkgravityandvoltage

ceprovidedonbackof Form

estofbatteryto seethatall

ndition.Atruetest cannotbe

elow1.225.If cellsvarymore

ndition.

oVainch aboveplatesby

batterysecurely,connect

e.

FUELVALVESAND

ratorandconnectinglinkage

dition,opensthrottlefully,is

peratesfreely.Openfuelvalves

witchatthis time.

STRUMENTS.Observe

r.16).Startengineto see

onofstarter aresatisfactory.

starterdriveengagesand

unusualnoise,whetherithas

andwhetherenginestarts

eethatall instrumentsoperate

thatoilpressureandammeter

y.

UEL).Afterstarting

partmentforindicationsof

m.

ECTIONS,BOND

spectbothgenerator

reingoodconditionandsecurely

ndparticularlyifradionoise

dingstrapsareloose ordam-

atnormaloperatingtem-

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rminute.Handthrottlemust

stmixturecontrolscrewuntil

.75).

(PAINT,SEATS,

ADS,STOWAGE,AM-

NDRACKS).Inspect

odconditionandsecurelyassem-

tfightingcompartmentis

factorycondition,andthat

seatoperateproperlyandare

yparticularattentiontosee

padsarepresentandproperly

xesandracksandthatclips

oldshellssecurely.

scopeprismsandwindows

dcondition,cleanandsecurein

ldersaresecurelymounted.

devicesoperatefreelyandare

hattheirtraversing,elevating

eeandnotexcessivelyworn.

sandtheirstowageboxestosee

dition,cleanandsecure.CAU-

anedonlywitha softcloth

AVEL,LINKAGE,AND

ttoseethattheseitemsare

yassembledandmounted,well

velyworn.Besurereturn

ullreleasedposition.Adjust

mately1%inches(par.98).

RS,LINKAGEAND

brakelevers,linkageand

eingoodcondition,securely

ndnotexcessivelyworn.Apply

observewhethertheyboth

ightlybeforereachingavertical

gleversarecorrectlyposi-

tancefromfaceofbrakedrum

eoflever is7to 7Vainches.

blyandmountingnutsand

HERS.Examineacces-

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dition,thatall mountingand


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wsaresecure,andthat there

herstosee thattheyarein

dnotclogged.

vebreathersandcleanthor-

alassemblyandmounting

DSEALS).Inspect

isingoodcondition,thatout-

embledandmountedandthat

ve,cleanandreinstallvent.

.Inspecttoseethattrans-

ates

tm 9-747 155-mm gun motor carriage

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