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E

1,ANDM3A2

Publ

icDomain,Google-digitized

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ING

uversmostenginefailurewas

beabsolutely

minimumof

inggears.

-hourintervals

verlonger

conditions.

fleastonce

80 F.before

erthan190 F.

PublicDomain,Google-digitized

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ARDEPARTMENT,

May9,1942.

CE

,ANDM3A2

tructions.Paragraphs

___ - -----------------------1-3

ddata----------_ 4^5

ndcontrols--------6-14

__________________ 15-18

__________________ 19-24

rvation-------------25-32

s__________________ 33-34

____________ ________ 35-37

nstructions.

ationonmaintenance_______ 38-39

ools______________ 40-41

___________________ 42-60

__________________ _ 61-67

___________________ 68-69

_ _ ________________ 70-81

______________ _____ 82-84

ntial,andsteering

-90

__________________ 91-93

___________________ 9499

dinstruments______ 100-118

nit_________________ 119-121

____________________ 122-126

__ 127-131

entandstorage______ 132-134

es_____________________________ 154

_ ....._._..._ _....155

TM9-750,October1,1941.

PublicDomain,

Google-d

igitized

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_use#pd-g

oogle

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ANCE

NS

ddata45

ndcontrols6-14

rvation2532

s33-34

t2

eseinstructionsarepublishedforthe

ofthepersonnelofthe usingarmscharged

nance,andrepairofthismateriel.They

majorunits andtheirfunctionsinrela-

entsofthetank,aswellas instructionsfor

orrepair,andunitreplacement.

nt.Chapter1containsinforma-

eof operatingpersonnel.Chapter

ndedchieflyfortheguidanceof personnel

aintenancework.

xIlistsallStandardNomenclatureLists,

herpublicationsforthematerieldescribed

LATEDDATA

inch).a.Themediumtankisan

vehicle,poweredbya nine-cylinder,air-


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,ANDM3A24


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E

nk.

oftank.


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,ANDM3A24

enginelocatedintherear ofthehull.The

andM3A2differprincipallyintheconstruc-

sariveted hull;theM3A1hasacast and

ull isofweldedconstruction.Allinfor-

anualisapplicableto allthreeofthese

epoweredbyeithera gasolineorDiesel

rsthevehiclebymeansof twolevers

thehull.Thevehiclehasfiveforward

hetankis wiredforradioinstallation

emwithinthe tank.

nk.

siderablythickerthanonpreviousmedium

nt uppersection,cupola,andturret

earmoronthesides ofthehullandthe

chesthick.

ndiameterandcanbe rotatedbymeans

yhand. Thecupolanormallyrotates

rotatedindependentlybyhand.

ectricalgeneratingsysteminthetank,

setpoweredbya single-cylindergasoline

atteries,heatstheengineand fighting

iescurrenttooperateturrettraversing


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,ANDM3A25

neral.

t,fuel,andcrewpounds55,600

s,approximately30

5

7

tracks)do83y2

ndR-975-EC2.

ssoriespounds 1,370

upola.

0machinegunmountedparallelto

frontend.

achinegunscarriedon brackets

tion.

nition.

unition.

unitionin50-roundmagazines.

ectedvisionisprovidedforthedriver

crewby indirectvisiondevicescalled

nthedoorsandfrontof thetank.

dsafetybeltsare providedforeachof

w.

arepaddedwithspongerubberneeded

bumps.

iving:

5-25


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NCE

chesthick,360 traverse.

fueling(8hours at18mph)miles144

higher

mate)2qt.perhour

ts36

donhardroadmph__ 25

peedsforvariousterrainsmph__ 4to20

nespeedrpm2,100

edrpm800

gabilitydegrees35

ngabilitydo35to45

nkwillcross feet__ 7%2

e,suchasawall,that thetankwill

tslowestforwardspeed)do42

6

hes3,432


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,ANDM3A2


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NCE

SANDCONTROLS

ntrols6

on!7

solineengine8

eselengine9

4

controls.a.Sparkcontrol.The

tomaticandrequiresnoattentionby the

rottle.Afootacceleratorpedalislo-

ansmissionhousing,convenienttothe

nctionwiththefoot pedal,ahand-

ed,whichismountedonthe floortothe

otherightof thegearshiftlever.

osteeringleversaremountedon the

each sideofthedriver'sseat.To steer

gleveron thesidetowardwhichitis

keitherone oftheleversslowsdownthe

e speedoftheothertrackis increased.

poweron bothtracksatalltimes

with rubbergrips.Thelowerends

s topermitrelocatingtheleverpositions

hedriver.Both leversareequippedwith

hinegunsin thefrontendofthe tank.

akes.Pullingbacksimultaneouslyon

downorstops thevehicle,dependingon

arkingbrakeleverislocatedonthe left

thesteeringlever.Itis atransmission

verbe'used foranypurposeotherthan

dalislocatedtotheleftof thetransmis-

othedriver'sleftfoot.To permitshift-

disengagedbydepressingtheclutchpedal.

ed,theengine willrunidle.


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,ANDM3A2

ofgearsinthe transmissionforspeed

bythegearshifthandlever,locatedon the

fthe driver.Thepositionsofthegear

speedsareshowninfigure7. Thegear

a latchwhichpreventsaccidentalshift-

rse.Thelatchmustbereleasedby press-

poftheleverbeforeshifting intofirst

tions.

tion.a.Bydriver.(1)Checksoil

essary.

llevel,addsoilif necessary.

dconditionoffireextinguishers.

aksonfloorof fightingcompartment.

s,clutchpedal,and gearshiftlever

efull range.

his openandvoltmeterreadszero.

alveis closed.

ndseesthat voltmeterreads24ormore

enatorderof tankcommander.

(1)Checksfinaldriveoillevels.


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ANCE

nspects

sunderneathtank.

es,pioneertools,towcable,shacklesand

sent.

rockets,bogiewheels,springguides,

ngrollers,andidlers.

essandtension,andconnectionsfor

dwedgenuts.

ofgrousers,if used.

andabouttwocompleterevolutionsto

ticlock.

eall lightsandthesiren.

flags,fieldequipment,andrations,when

ed.

raversingofvehicleweapons.

to seeifitturns freely,byhand,and

gmechanismfunction.

atorandthenoperatesturret bypower,

tion.

checkedforoperation.

gasolineengine.Afterthepre-

encompletedtheengineisreadyto start.

strokesof theprimingpumplocated

g.8). Excessiveprimingshouldbe

encytowash lubricantoffthecylinder

ssivewearanddamage.Donotprime

parkplug holeswithrawgasoline.Do

ever almosttothe"closed"position.

ntheignitionswitchto the"both"

stercoil switchlocatedontheinstrument

res,openthethrottleslowlyuntilthe

rpm.Ifthethrottleis openedrapidly

re, theenginemaystop.

ted

oseethat theyarefunctioningand

gs.


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ANDM3A2


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NANCE

esin powertrainandengine.

on3positions.

Dieselengine.Afterprestarting

neisstartedas follows:

sionlevertoputtheengineon decom-

ompleterevolutionbyhand.

ompression.

gein thecartridgestarterandfire.

nasthe enginehasstarted,theoil

atched.Ifthegage doesnotindicateoil

inute,theengineshouldbeshut downand

oldweather,whentheoilhas notbeen

ethrottledto800rpm untiltheoiltem-

aspeedof800rpm untiltheoilpres-

0pounds,whichisnormalforthis speed.

ntinuedforatleast 5minutes,after

creasedto1,000rpm. Shouldoilpressure

eed,theengineshouldbe throttledback

espeedisagainincreased.Athorough

ded.

egagereads80, openthehandthrottle

eterreads2,000rpmandthen closethe

enginespeeddrops to800rpm.Check

tionofengine.Checktheoilpressure

dnote thelossofspeedwhenthe engine

oata time.Thespeedshouldnotdrop

at attainedwhenoperatingonboth

.General.Thedrivershouldbethor-

nctionandoperationofall thecontrols

temptingtodrivethevehicle.Review

madeincaseofdoubt.

riverinthedriver'sseat,the engine

trumentsshowingnormalreadings,the

vethevehicle.

ke(locatedonfloorto theleftof

ypressingthe clutchpedaldowntothe


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,ANDM3A211-12

ovethegearshift leverintosecond

ngine,graduallyreleasethe clutch

fire,attemptingtomovethevehiclein

thouttheaidofpersonneloutsideof the

s verydangerous.

ning isthatwhichenablesthevehicle

peed withoutcausingtheenginetolabor.

edriver'sleftfootmustbe completely

edalwhiledriving,toavoidunnecessary

reversegearacompletestopmust

oseduntil thetachometerreads400rpm

hiftbrieflyintothirdgear tostopthe

essingthelatchmovethegear shiftlever

7). Backingthevehicleshouldnever

serverisstationedin fronttoguidethe

right-handsteeringlevertomakea

leverforaleftturn. Thisactionkeeps

ng asfastasthe othertrackandmore

veranticipatesmakinga turnhemust

throttletoagreater extentdepending

rn.

easethethrottleandpullbackon both

etime,depressingthe clutchwhenthe

oapproximately2to5 milesperhour,

arisbeingemployedbeforestopping.It

aslowaspossible,preferablytosecond

o slowthevehicletofacilitatestopping.

catedonthefloortothe leftofthe

ouldbeused onlyforparkingandnever

ion.Theoperatorshouldalwaysmake

asedbeforeputtingthevehicleinmotion.

oiltemperaturegage,andtheoil pres-

tisfactoryindicationsofthe engine'sper-

cationsofanyoftheseinstrumentsap-

ngineshouldbestoppedandthe cause

eratureshouldnotexceed190.

Gasolineengine.Tostoptheengine

engineisidlingat 800rpmandrunthe

or5 minutes.Thenthrowthefuelcut-off


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ENANCE

aneltothe "off"position.Whenthe

etheignitionswitchtothe "off"position,

supplyvalves.

theDieselengineidle at800rpmfor

ndthrottlein theextremeclosedposition.

hefuelline valves.Ifthesevalvesare

rto getintotheinjectingsystem,result-

tialwarming,thetankenginemustbe

nginespeeds(1,800-2,100rpm),exceptfor

,600rpm.Continuousoperationofthistype

shortentheusefullifeofthe enginecon-

asedwearandoverheating.Onnooccasion

udingmilitaryceremonies,willidlingofthe

mbepermitted.Whilethedamageto the

apparent,thetotallife oftheenginewill

ed atabout800rpmuntil theengineoil

esatemperatureriseofabout10 F.before

lspeedand underload.Thisisnecessary

ngineworkingparts.Avoidrapid move-

ncethiscausesaspray ofgasolinetobein-

hisgasolinewashesoilfrom thecylinder

ewear.

theengineby"towing"or"coasting"the

eseriousdamageto theengineandtrans-

e,usethe electricstarterorhandstarter.

toplaceanyobjectina positionwhereit

omthecylinders.Blockingoffanycylinder

dpreignitioninthecylinderso affected.

t toblockengineoilcooler.

n.Inorderthatthetankenginemay

tha minimumofdifficultyinverycold

ythatthe followingprecautionsbetaken

neincold weather,pullouttheoildilu-

n,whichislocatedundertheengine oiltank,

e appropriatenumberofseconds,depending

perature(seechartinpar.17).The older

eratedvalves;latermodelshaveasolenoid-

ntrolledbyabuttonon theinstrumentpanel.

allyoperated,theenginecompartmentmust


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,ANDM3A214-16

heckedtomakesureit isclosed.Following

the enginemustbeoperatedatleast20

dtoinsurethe evaporationofthegasolinein

mustbedisconnectedatall timesexcept

onisabsolutelynecessaryandthenthe oil

eused exceptwhencoldstartingconditions

eltersofanykindareavailable,the tank

helters andsomemethodofheatingprovided.

nstfirehazardsfromleakingfuelor oil.

ailable,tankswhichmustbekeptavailable

keptwarmconsiderablyaboveprevailing

withatarpaulin.

tingthe engine,itshouldbeheatedby

eratorsetaccordingtothe directionsgiven

onditionsitmaybenecessary,inorder to

ercisespecialprecautionsinlubricating

mament.TM9-850givesinformation

mentofsuchequipmentduringextremely

ormediumtanksM3andM3A118

owsthevariouspointstobe.lubricated,

andlubricantstobe used.Inaddition

othermovingpartssuchasdoor and

overs,doorlatches,andgun mounting

requentintervals.Oilholesand lubrica-

foreasyidentification.

gineoilsystem(fig.9), oilisdrawn

tankbytheengineoil pumpandforced

he excessoilintheengineoil circuit

oiltankbytheoil pump.Theoil,after

s,accumulatesatthebottomofthecrank-

edbytheoilscavengingpumpthroughthe

dthento theoiltank.Theoil tankand

bulkheadinthefightingcompartment.


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E

ypeoilfilter(fig. 10)shouldbeturned

neitherdirection)eachday.Ifexamina-

ppreciableamountofdirtordiscoloration,

dand exchangedforanewone.

ONTROL

em.

nnection,fromthenoseof theengine

toprovidenecessaryventingoftheengine.

ledthroughthe fillerholeonthe tank.

edwitha bayonetgagewhichindicates


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,ANDM3A2

ystem,removethecoverplatelocated

rectlyunder theoiltank.Thispermits

Thisvalveisused topermiteasier

oldweatherbymixinggasolinewiththe

gtheenginein coldweather,pulloutthe

ilter.

hichislocatedundertheengineoil tank

the gasolinevalveandallowsgasoline

eriodoftimeto holdthevalveopenwill

e.Todeterminetheperiodof timeto

atethelowesttemperatureanticipatedat

ndthis temperatureinthetablegiven


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E

cooler.


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,ANDM3A217-18

tionvalveopenthelengthoftime in-

eratureinthechart.

heldopen,idleengineat 1,000rpm.

atelyafterthedilution valveisclosed.

timatedby countingonethousandone,one

achexpression"onethousandone",etc.,

y1second.

emberare

dfor atleast30minuteswhenstarted

ilutedoil.

ownimmediatelyafterdilution.

an250 secondsmustnotbeused.

must notbeusedexceptduring dilu-

sformediumtanksM3and

ommendations

herictemperature


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E

.,.|

1

able)

holes)

EO 1-~

nstructionsformediumtanksMSandM3A1.(OrdnanceDepart-

ocatedonnameplateinsidefightingcompartment;SNLG104.)


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ean,andrefillwithengineoilSAE 30above32F.,SAE10

peratingondirtroads oracrosscountry.Serviceevery250

avedroadsor duringwetweather.Dependinguponoperating

anerandwashallpartsevery100 to500miles.Caution:Keep

ht.

koilleveldaily.Drainat intervalsshownbelow,onlywhen

nd oilfillingtubestrainerevery1,000 miles.Refilloiltank

age,locatedunderfill cap.Caution:Donotremovestrainer

nandrefillevery250milesor 25hourswhenusedforcross-

on.Drainand refillevery1,000milesor100 hourslorpaved

tion.

ndrefillevery250miles or25hoursof operationunderall

icatedarefornormalservice.Forextremeconditionsof

snow,dust,etc.,changeengineoilandlubricatemorefrequently.

applyinglubricant.Lubricateuntilnewgreaseextrudesfrom

veldaily;addlubricantifnecessary.Checkwithtankonlevel

efillat theendoffirst250 miles;thereafterasindicatedat

smissionanddifferentialfillerstrainer every3,000miles.

rainerwhenfilling.

oint.Removetunnelshieldsectionsoveruniversaljoints

nnelshield.Tolubricateslip joint,removeplugandinsert

aljointuntil itoverflowsatreliefvalveand toslipjointuntil

line.Caution:Afterlubricatingremovefittingand replaceplug.

ntopof filteronefullturndaily. Drainevery250miles.

automatictypefilter.

Turnhandleontopoffilterone full,turndaily.Drain

ks,drainthroughdrainplug,andremovefilterelement.Wash

eelement,andprimefuelsystem.ReplacesecondstageAmerican

elsevery3,000miles.

tedoorandshieldhinges,peepholeprotectors,pistolport

rolrodpinsandleverbushings,etc.,withengineoil SAE30

at timeofengineremovalforperiodicinspection.Clutch

bbearing.

by ordnancemaintenancepersonnelattimeof generalengine

ring,clutchhubbearing,generator,magneto(exceptoilers),and

).


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E

GV4

E

Fillplug)

,1

s

dCG'/4

G'/4

AVERSINGMECHANISM

lCGi/,

in!

CG '/4

GV4

nstructionsformediumtanksM3andM3A1Continued.

icatedarefornormalservice.Forextremeconditionsof

snow,roughroads,dust,etc.,lubricatemorefrequently.

applyinglubricant.Lubricatebogiewheels,idler,andtrack

ntoverflowsreliefvalve.Lubricateother fittingsuntilnew

bearing.Caution:Lubricatesuspensionpointsafterwashing

wo-cycle,air-cooledengine,mountedonturretfloorrear, islu-

dwith thefuel.Mixthoroughly%pintBO witheachgallonof

totank.Caution:Donotpour gasolineandoilseparatelyinto

an.Every200hours lubricatemagnetocamfollowerbyoiling

EO.

epeepholeprotectorslides,doorhingesandlatches,shield

vises,etc.,withEO sparinglyevery250miles.

ation.Turrettraversingmechanismgears,bogiewheelsus-

,andfinaldrive sprocketbearings.


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,ANDM3A219-20

on20

on21

23

mechanicalefficiency,itis necessary

lyinspectedatintervalsinorderthat

ordiscoveredandcorrectedbeforethey

astingsorother metalpartsmayoften

etionofarun byanexaminationfordust

cracks.

ngesindesignpromptedbychronicfail-

orgroupofunits;pertinentchangesin

emethods;andchangesinvolvingsafety,

omfortshouldbeforwardedtotheofficeof

oughtechnicalchannels,atthetimethey

couraged,inorderthatotherorganiza-

ation.a.Bydriver. (1)Checks

cessary.

llevel;addsoilif necessary.

dconditionoffireextinguishers.

aksonfloorof fightingcompartment.

s,clutchpedal,and gearshiftlever

efull range.

his openandvoltmeterreadszero.

alveis closed.

ndseesthat voltmeterreads24ormore

enatorderof tankcommander.

ydraulicbrakeboosterpumpisclearof

plateandexamines"tee"connectionof

atedforwardofengine,forleaks.

clinesofbrakebooster systemfor

lips.

ankof brakeboostersystem.


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ENANCE

(1)Checksfinaldriveoillevels.

nspects

sunderneathtank.

es,pioneertools,towcable,shackles

present.

rockets,bogiewheels,springguides,

ngrollers,andidlers.

ess,andtension;endconnectionsfor

dwedgenuts.

ofgrousers,if used.

andabouttwocompleterevolutionsto

ticlock.

eall lightsandthesiren.

flags,fieldequipmentandrations,

yloaded.

raversingofvehicleweapons.

to seethatitturns freely,byhand,

rsingmechanismfunction.

atorandthenoperatesturret by

ofoperation.

checkedforoperation.

ation.a.Duringoperationthe

etectabnormalfunctioningoftheengine.

etectunusualenginesoundsornoises.He

ttheinstrumentpanelgagesto seeifthe

erly.Anunsteadyoilgagepointerindi-

videdthatenginespeedis fairlyconstant.

mustbecheckedforclearancebeforeengage-

iredfor braking,etc.

lcircumstancesshouldatankbeoperated

havebeenobserved.Whenindoubt,the

andassistanceobtained.Inspectionduring

tirevehicleandshould beemphasized

ructionperiod.

Ateachhaltthe operatorshouldmake

ankto determineitsgeneralmechanical

etectedduringthemarchtogetherwith

haltshouldbecorrectedbeforeresumingthe

otbecorrectedduringthehalt,proper


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,ANDM3A222-23

houldbemadeso thatunnecessarydelay

failureprevented,

eis asfollows:

nashorttimeat idlingspeed(800rpm).

rain noises.

anddifferentialoilleaksinside fighting

ent.

gunshaveworkedloose,theyshouldbe

thebulkheadexaminetheclutchthrow-

outerrace.

e,lookingcarefullyforfuelor oilleaks.

rthetrack supportrollersandfrombe-

stmentandforworn,loose,broken,or

s formissing,worn,orlooseparts.

usingsandgear caseforevidenceof

compartmentandinspectforloose parts,

aks.

ravelingatnightwithlights.

uelin thetank.

ndvision devices.Donotuseanoily

tion.Attheconclusionofeachday's

andershouldcauseaninspectiontobe

at haltsbutmorethoroughanddetailed,

ommander'sReport.Theinspection

entivemaintenance.Ifdefectscannotbe

reportedpromptlytothechiefof section

ual.Thefollowingpointsshouldbe

bogies.

es.

ketsforwornor brokenteeth.

kshoeunitsfor unserviceableunits.

velaftertankhasstood overnight.

elaftertankhas stoodovernight.


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ENANCE

nersduringextremelydustyoperations.

indshieldwipers.Checkforloss or

ersandaccessories.

ision devicesforbreakage.

sfordefectiveperformance.

uipment,andaccessoriestodetermine

rlyinstalled.

dsightingcompartmentsforcleanliness

mmunition.

ninhotweather,batterywatermustbe

week.

et.

gunit.

ssuregage,whichshouldreadabove

rsystemsump tank.

tersystemforvisibleleaks.

wigs,etc.,frommovingpartsatbrake

ingbrakebandsandactionof hydraulic

kelevers.

Thefollowingperiodicinspectionsare

der

ountoffuel.

Engineoillevel.

enginebyhand.

rtools.

ndshacklepins.

el.Guidesandgudgeons.

ndIdlers.

ers.

ors.

00rpm.Wedgesandwedgenuts.


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,ANDM3A224

der

ports,etc.

eLights.

munition.

ed.Weapons.

Gunmounts.

eaks.

move,clean,andtestsparkplugs.

kerpointhousingsandcheckpoints.

ainer,bypassstrainer,andoilpump

ntingbolts,airintakepipesforloose

ckedcarburetorelbow.

oseparts,nuts, bolts,lines,connections,

mulatedundertwolowercylinderheads.

tlecontrolsformissingcotterkeysand

erationandrpm(2,100).

connections,shut-offvalves,etc.,for

ompletelyandclean.

onandclutchreleasebearingsforproper

epsandmakeourdriver's report.

heckallitemson50-houranddaily

ubricationofthevehicle(followlubrica-

nk.(Followingparagraph59,break

cifiedfollowallstepsinorder.)

,andcleanCunooilfilter.

umpstrainer.

es.


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ENANCE

ovehopperfromtank.Inspectfor

eanit,andcheckforcrackedorworn

r'sseat,tunnelinspectionplate,andtun-

ointand frontcompanionflangebolts

t.

torlinkage.Cleanouttunnel.Check

inecompartmentsandtracecauseof

oversandcheckallvalveclearances.

SERVATION

9

es32

accuraterecordmustbekeptof each

eOrdnanceDepartment.Forthispurpose

(O.O.FormNo.7255),generallycalled

eachvehicleandmustaccompanyitat

esa completerecordofthevehicle,from

onconcerningoperationandmaintenance

ndorganizationcommandersmustinsist

de.Thisbookwill habituallybekeptin

tsbeing injuredorsoiled.

ordofassignmentmustbedestroyed

atzone.All otherreferenceswhichmay

entityof theorganizationmustalsobe

,andmudarethe sourcesofgreatest

tsof dirtandgritare allowedtoaccumu-

their wayintobearingsurfaces,causing

heconditionisnotr emediedwillsoon

henremovingenginepartsoranyother

dreplacements,orif inthecourseofin-


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,ANDM3A226-28

bearingsurfacesaretobe exposed,alldirt

waytotheexposedsurfacesmustfirst

etoolsmustbeclean,andcaremust always

ossibilityof brushingdirtorgrit intothe

other partoftheclothing.Tocutoil-

nedgrit,or roadoilusedry-cleaning

notwaste)or abrush.Thevehicleisso

tyofinterferingwith itsproperoperation

cleaningwaterisverysmall.However,

epwaterfrom thepowerunit,asit might

onandcarburetion.

omecloggedshouldbeopenedwitha

neverbeused forthispurpose,assplin-

andpermanentlyclogthepassages.Par-

ntoclean anddecontaminatevehiclesthat

attack.SeesectionVIIfordetailsof this

ematerielispaintedbeforeissuetothe

enancecoatperyearwill ordinarilybe

butfewexceptionsthismaterielwillbe

hetic,olive-drab,lusterless.Theenamel

atsof longoilenamelandoil paintprevi-

ceDepartmentiftheold coatisinsatis-

nting.

usuallyissued readyforuseandare

They maybebrushedonsatisfactorily

eoriginal packageconsistencyorwhen

ercentbyvolumewiththinner.Theenamel

enthinnedwith15percentbyvolume

stnot beusedasa thinner,sinceitwill

inthisenamel.)Ifsprayed,it drieshard

in^hourand drieshardin16 hours.

eregulationsconcerningpaintingexist.

sightingequipment,andotheritemswhich

willnot bepaintedwitholive-drabenamel.

npaintingiscontainedinTM 9-850.

a.Ifthebasecoaton themateriel

oredesirabletostrip theoldpaintfrom

ding andtouch-upmethods.After

ecessarytoapplyaprimercoat.

tic,shouldbeusedonwoodas abase

Itmaybeappliedeither bybrushingor


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ENANCE

actorilyasreceivedor aftertheaddi-

rcentbyvolumeofthinner.It willbe

minutes,andhardin5 to7hours.For

dwithnot morethan15percentbyvolume

notbeappliedto theprimer,ground,

48hours.

hibiting,forbaremetal,shouldbe used

suseandapplicationaresimilar tothose

paintingdependspartlyontheselection

olargelyuponthecareusedi npreparing

g.All partstobepaintedshouldbe free

osene,oil,andalkali,andmust bedry.

s.Ifmetalpartsareinneed ofclean-

din aliquidsolutionconsistingof1/2 pound

armwater,or anequivalentsolution,then

ped thoroughlydry.Woodpartsin

treatedin thesamemanner,butthealka-

eftonformorethan afewminutesandthe

ryassoon astheyarewashedclean.

veequipmentisinfair conditionandonly

placesshouldbetouchedwithenamel,syn-

ss,andpermittedtodry.Thewholesur-

redwithpaper,flint,No. 1,andafinish

olive-drab,lusterless,appliedandallowed

ematerielis used.Iftheequipmentisin

uldbe thoroughlysandedwithpaper,

ivena coatofprimer,ground,synthetic,

tleast16hours.Theywill thenbesand-

No.00,wipedfreefrom dustanddirt,and

hetic,olive-drab,lusterless,appliedand

beforethematerielis used.

Camouflageisnowa majorconsidera-

ehicles,withrustpreventionsecondary.

esentemployedutilizesthreefactors:

.Vehiclesarepaintedwithenamel,syn-

ss,whichwaschosentoblendinreasonably

scape.

errepeatedpaintings,thepaintmay

kandscaleoff inplaces,presentingan

uchisthecase,removetheold paintby

on(seeTM9-850 fordetails)orremover,


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,ANDM3A231-34

portantthateverytraceoflyeor other

elyrinsedoffandthatthe equipmentbe

ntingisattempted.Itis preferablethat

limitedtoiron orsteelparts.Ifused on

tnotbe allowedtoremainonthesurface

ore beingthoroughlyrinsedoffandthe

s.Crevicesorcracksinwoodshould be

oodsandpaperedbeforerefmishing.The

ouldbepaintedaccordingtodirectionsin

vices.Oilcups,greasefittings,oil-

ngdevices,aswellasa circleaboutthree-

eterateachpointoflubrication,willbe

waterresisting,inorderthat theymaybe

AS

riel34

a.Formaterielinconstantdangerof

chemicalcloudsorchemicalshells,care

unpaintedmetalpartsofmateriel,with

on,lightlycoatedwithoilandprotected

e. Caremustbetakenthattheoil does

eopticalparts oftheinstruments,with

orwithammunition.Thelattershould

rs.

acticallynoprotectionagainstmustard

ndoilclotharepenetratedif sufficient

he lengthoftimeallowedforpenetra-

rof wearingthesearticles.Forexample,

eenworninan areacontaminatedwith

avedangerto menwhowearthemseveral

ent.Impermeableclothingwillresistpene-

t shouldnotbewornlongerthan that.

ateriel.a.Cleaning.(1)Allun-

erielthathavebeen exposedtoanygas

temustbecleanedassoonas possiblewith

naturedalcoholandwipeddry.Following

dbe coatedwithengineoilorspermoil.


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ANCE

onhasbeenexposedtogas,itmust be

eitcanbefired.Tocleanammunition,

inatingagentor,ifthisisnot available,

rshouldbe used.Aftercleaning,wipe

eanrags.Donot usedrypowdered

hlorideoflime)onornearammwrdtion

sthroughtheuseof thechlorideoflime

followingmeasuresshouldbetakenfor

icals(mustard,lewisite,etc.)from

erations,a completesuitofimpermeable

maskmustbe worn.Immediatelyafter

thoroughbathwithsoapandwater

ken.Ifany skinareashavecomein

venaverysmalldrop ofmustardgets

rofmustardhasbeen inhaled,itis

first-aidmeasuresbegivenwithin20or

.First-aidinstructionsaregivenin

.Garmentsexposedtomustardgascanbe

eableclothinghasbeenexposedto vapor

natedbyhanginginthe openair,prefer-

veraldays.Itmayalsobe cleanedby

eimpermeableclothinghasbeencon-

tardgas,steamingfor6 to8hourswill

ofsteamingdevicescanbeimprovised

thefield.

materielofdirtthroughthe useof

ustbeburiedimmediatelyafterthis

terieliscoatedwithgreaseor heavy

dberemovedbeforedecontaminationis

gsolventorotheravailablesolventsfor oil

attachedtoendsofsticks.Followingthis,

ielwithbleachingsolutionmadebymixing

agent(chlorideoflime)withonepart

beswabbedoverall surfaces.Wash

allsurfaces.

tsand instrumentsexposedtomustard

contaminatedwithanoncorrosivedecon-

onepartsolidtofifteenparts solvent

.Ifthisisnotavailable,usewarmwater

onmustnotbeused,becauseofits


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,ANDM3A234-35

entlensesmaybecleanedwithlenstissue

all amountofethylalcohol.Coatall

engineoilor spermoil.

ontaminatingagent(chlorideoflime)

aybetemporarilycleanedwithlarge

ever,mustardlyinginjointsor in

t removedbythisprocedureandthus

ceofdangeruntil thematerielcanbe

.Allmustardwashedfrommaterielinthis

theground,necessitatingthatthecon-

markedwithwarningsignsbefore

aminatingofmaterielwhichhasbeen

ewillwasharseniccompoundsintothe

iesinthe localityforeithermenor

thathas beencontaminatedshould

thbleachingsolution.Intheeventthis

maybenecessarytoburn orburysuch

thathavebeensubjectedtogasattack

eair cleanersshouldbeservicedbyre-

ha dry-cleaningsolvent,andrefilling

il.Instrumentpanelsshouldbecleaned

tlinedforinstruments.Seatcushionsthat

bediscarded.Washingthecompartments

solutionsisthemostthat canbedone

ldbe constantlyonthealert,when

ofhightemperatures,forslowvaporization

site.Exteriorsurfacesofvehiclesshould

leachingsolution.Repaintingmaybenec-

.

decontaminationwillbefoundin

mmand37-mmcombinationgun

dividualmodelnumbers,areconsidered


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E

nk.Formoredetailedinstructionson

ervationofthegunsandtheir mounts,

sfor theguns(seeappendix).The

rtgivesthelocationofammunition.Also

t.

t.

s.

munitioncarriedin

munition.

munition.

munition.

l..30ammunition.

munition.

eltscontaining225

n.

ontaining225

n.

dbeltscal..30

munition;six100-

nition.

munition.

iedintankbut

9 rounds

edincartons

clipscal.

(1)Thisgunmountis locatedinthe

mpartmentandmountsthe75-mmtank

ntaredesignedsoasto providepro-

elunderall conditionsoftraverseand


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,ANDM3A235

CHART

ment,rightside,

n.

e).

13).

fig.13).

dradiooper-

n turretwall

fightingcom-

ronrackrear

(16,fig.13).

37-mmbox.

boxalongside

seat,with37-

sing.

xtto75-mm

sing.

or'sseat (20,

ward).

cityof250roundsbutare loadedwith226roundseach.


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E


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,ANDM3A235


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E

SITIONINGPIH

GLATCH

PublicDomain,

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,ANDM3A2

ton theleftsideof thegunmount,

hegundoesnotchangewhenthe gun

ersed15 ineachdirectionbythelower

nfrontofandfacingthegunner.Clock-

eeltraversesthegun towardtheright;

theleft.

ted20 ordepressed9 byturningthe

nfrontofthe gunner.Thewheelis

tingandcounterclockwisefordepressing.

thprotectoscope.

ghthe periscope,intowhichisbuilta

onalperiscopeandsightarecarriedin

gdevicemaybe removed,ifdamaged,

the rearofthehousingand pulling

to thebottomoftheperiscope.Thetele-

edbytakingoffthe bracketwhichholds

wsightingdevicemaybepushedinto

ispulledoutwardtopermitits

alplatformin themainfightingcom-

75-mmgunloader.Closebyhimis


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CE

5submachinegunsM1928A1foruse

thetank.Refertofigure13 forammu-

efiredmanuallyorelectrically.The

depressingthebuttonlocatedinfront

pe.

eel.(Seefig.14.)Thegunis firedman-

nlocatedin thetraversingmechanism.

fig. 15).Thegunslocatedinthe

gunM5orM6 andacaliber.30machine

mountedtogetherandmoveasone unit.

urning thewholeturretassembly,using

hand.

the37-mmgunsM5 andM6arenotto beinterchanged.


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,ANDM3A2

erseseesectionXIV,chapter2. The

atedontheleftside ofthe37-mmgun

ner.Turningthehandwheelcounter-

unsamaximumof7 andturning

oamaximumof60.Thegunsare fired

smfrom protectoscope.

hesafetygripanddepressingthe

raversingcontrolhandle(fig.15).The

iber.30machinegunandthe bottom

mgun.Thegunnersitson theleftside

erontheright.Caremust beexercised

ndisnotcaughtin theautomaticbreech-

munitionstowage.

r.30machinegunM1919A4ismounted

betraversed360 byrotatingthecupola.


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ENANCE

ersedtoalimitedextentindependentofthe

onis60 andmaximumdepression8^.

bysqueezingthetrigger.

ebowgunsare locatedintheleftside

nt,projectingthroughthefrontplate,and

0machinegunsM1919A4whicharefired

eelevatedmanuallyandhavenotraverse.

bysteeringthetank.Thegunsmaybe fired

itchesmountedonthesteeringleversor

triggers.Relayswitchesarelocatedin

rumentpanel.

arriedontheoutsideofthe tankfor

guns.

oThompsoncaliber.45submachineguns

main fightingcompartmentofthetank.

edthroughthepistol portsorpartially

andwhendismountingis necessary.

inegunarelocatedbelowthecaliber.30

heleft oftheradiooperator.Thesecond

edonbracketsintheupper rearright-hand

partment.

ption.Boththe37-mmgunin the

n therightsponsonarestabilizedby

ticallycompensatesforthepitchingofthe

rtendstokeepthe guninthesame

egardlessof thepositionofthetank.

separatesystemseachconsistingprin-

drivenpump,pistonand cylinderas-

lectriccontrolbox,recoilswitch,anda

bilizersystemsaresimilarandhavethe

followinginstructionswillapplyto both

tarteitherof theunitsproceedas

at zero.

vatingmechanism.Thisisaccom-

37-mmsystembypullingoutthe disen-

g.76)and pullingdownward.Thisauto-

gagingswitch.Thehandelevating

mgunisdisengagedbymovingthe clutch

osesthe disengagingswitch.


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,ANDM3A236-37

wheeluntilthe controlunitis

lposition.

switchto the"on"position.

zersshouldnotbeoperatedexceptwhen

dglowfromthelight onthecontrol

temis inoperation.

Afterthesystemhaswarmedupturn

bslowlyinthe directionofthearrow.

bratedecreasetheadjustmentuntilthe

acheck,pressonthe breechsuddenly

mestorestalmostimmediatelyaftera

operlyadjusted.Itmaybe necessary

ustmentfromtimetotime astheviscosity

herecoiladjustmentmustbemadeby

Graduallyturntherecoiladjustingknob

wuntilthepointis reachedwherethegun

onduring recoil.

estabiliserequipmentis running,the

edby simplyturningthehandwheel.This

rrelationbetweenthegunandthe control

icallytakesupanewdesiredposition.If

operatingsatisfactorily,itwillkeep the

onwithincertainlimitswhilethetank

enaiming,allowthestabilizertocontrol

dusethehandwheelonlywhennecessary.

gainstcontinuingtoturn thehandwheel

ts maximumlimitsoftravelintheeleva-

ningofthe handwheelwiththegun

splacethecontrolunitfromits vertical

beanoverloadonthe tankbattery.

(1)Oillevel.Theoillevelsinthe

eckeddaily.Thereservoirshouldbe kept

oil.

tsareprovidedwithalemitefittings

elubricatedevery25hourswithchassis

a.Thedescription,operation,adjust-

vationofthe75-mmgun sightingequipment

onthe37-mmcombinationgunmount

s isusedasan observinginstrument


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ANCE

t.Thevisiondeviceislocatedattheeye

tsin position.Atelescopesightisbuilt

siondevice.Theentirevisiondeviceis

nginthelever buttonlocatedinfrontof

eheadrestandthenpullingon thering

he housing.Thetelescopesightcan

offthe bracketwhichfastensitintothe

vicesandtelescopesarecarriedincon-

ssothatrapidreplacementcanbemadewhen


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,ANDM3A238

TIONS

ationonmaintenance38-39

ools40-41

42-60

ntial,andsteeringbrakes85-90

s94-99

ndinstruments100-118

nit119-121

entandstorage132-134

NMAINTENANCE

9

ofmaintenanceandrepairsbythecrew

garmsisdeterminedbythe easewithwhich

plished,theamountoftimeavailable,the

herconditions,temperatures,concealment,

efire,theequipmentavailable,andtheskill

e arevariableandnoexactsystemof

edorfollowed.

intenancedutieswhichmaybeperformed

ncepersonnel.Allotherreplacementsand

ythe ordnancemaintenancepersonnel.

ve(seepar.59).

uffler,replace.


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ANCE

.

n,check,andreplace.

replace.

eplace.

ndclean.

ce.

ean.

checkandreplace.

ndtighten.

e.

rvice.

bowtomanifold,replace.

place.

.

imingwheninstallingmagnetos.

e.

,replace.

ace.


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,ANDM3A238

.

ace.

e.

orservice.

ace.

erviceandreplace.

erviceandreplace.

cesparkplug.

embly,replace.

place.

sembly,replace.

ce.

ce.

s,bogieor idler,replace.

ve.

uts,andscrews.

rse.

.

olecovers,serviceandreplace.

ce.

ngunits.

.

eplace.

ace.

ce.(Seenote.)

e.

place.


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ENANCE

nlatestmodels2decheloncanre-

theoldermodels itwillbeneces-

kedrumanddifferentialhousingsin

bands.In thiscaseordnanceper-

)

eenote.)

replace.

nism,refilloilreservoir.

place.

eplace.

uthorizedtoremoveandreinstallengineand power

cludesthetransmissionanddifferentialhousings.

ntofanenginewithanotherengineorthe replacement

withanotherpowertrain assemblymustnotbedone

authorizationisreceivedfromordnancemaintenance

g.Beforestartinganyenginealways

ostaticlockbyturningthe engineovertwo

onsbyhand.Ifextraresistanceisfelt or

edover,removethespark plugsinthelower

trappedfluid. Ifafterdraining,the

ver,callordnancepersonnel.If,onthe other

rnedover byhandandtheenginefails to

pts,anyoneorcombinationofthe following

se.

rwhenstartersolenoidispressed.(1)

vity.

ss,replacewithfullychargedbatteries

atteriesrecharged.

ately1.280thebatteryisfullycharged.

onofbatterycables.

nalsforcorrosionandbatterycablefor

s.Cleancorrodedterminalsandreplace


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,ANDM3A239

ectionsandtightenclamps.

tchtoascertainif itisfunctioning.

enoidfor clickasbuttonisdepressed.Ifno

olenoidordisconnectthebattery-starter

motor,and whileanotherpersonoperates

cableagainstthe housing.Asparkshould

thesolenoid.

operateaftersolenoidclicks,starter

otstart. (1)Checktheignition

sforbreaks,wornsections,and loose

efromthe sparkplugandcheckfor

xceeds%inch,itis anindicationthat

etosarefunctioningproperly.

ndlowercylinderspark plugand

ainandcorroded,burnt,ordirtyelec-

djustall thesparkplugs.Replaceall

s.

ficientlength,then checkthebooster

by listeningforabuzzingsound

thestarterswitch.If a

he coil.

booster coilbydisconnectingthe

htmagnetoatthemagneto

bystartermotor.Thespark

proximately%inchlong.

%inchreplacethecoil.

hespark.

tactpoints(gap0.012inch).In-

orburning.Ifthepoints

beduetoa looseordefective

ionofthemagneto.Ifthe

epoints maybesmoothed

stick.(Adjustgap.)Ifthe

burntreplacethemagneto.

he points.Ifmagnetodoes

ngcheck,replacemagneto.

elin thefueltanks.


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ENANCE

efuel valvesareopen.

torforflooding.(Carburetorwillbe

isusuallydueto stickingofthefloat

e.If suchisthecasereplacethe

at thecarburetor,turntheengine

motor,andwatchforfluid

ectthecarburetorinletline atthe

hthel inetodetermineifit

cleanbyblowingcom-

e.

hetrouble maybeinthefuel

connecttheinletfuelline to

pandifthe lineisopen,fluid

t flow,thelinesare

es.Iffuel doesflow,re-

p.Nowturn theengineover

dappearsatthedischarge

; iffuelflows,checkthe

eredbythe pump(3

checksenumerated,iftheengine

newcarburetorandattemptastart.If

enremounttheoriginalcarburetorand

el.

LTOOLS

41

stedbelowarecarriedwiththevehicle

n theexteriorofthehull orlocatedinside

venientplacesavailable.

arried

bOn tank.

.O.FormNo.Intank.


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,ANDM3A240-41

arried

e)Ontank.

turret.

ndioxide,4-lb.,filled1intank;1 inturret.

dioxide,10-lb.,filledIntankunderturret.

ber,pair(QMCIntank.

kM3)In tank.

,withbulbIn tank.

umtankM3)In tank.

ad)Ontank.

ividually,2keysOntank.

ointOntank.

n.),13 in.longOntank.

handle,mattock

4in.),25 in.longOntank.

nkM3)Intank.

dwitheachtank.

em.a.Operation.(1)Thefire

tirelymanualinoperation.Itis there-

beas littledelayaspossiblein discharg-

enessismateriallyincreasedbycatching

pull onecontrolhandle.Controlhan-

ank attheturretbasketbracket,adjacent

sidetankabovethemotorcompartment.

chargingoffirstcylinder,pullother

bereleasedatcylindersbyremovingpull-outpin in

manuallever.

eextinguishingsystemconsistsofasup-

oredin twosteelcylinders,eachhavinga

arbondioxide;manualreleasegearfor

eachcylinder;andtubingtoconveythe

ment.Thetubingis terminatedinshielded

ffectivelydistributethegas.


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ANCE

re connectedtothesupplytubingby

ee,whichteepreventsthelossof gasinto

ouldonecylinderbeoperatedwhilethe

orweighingorrecharging.

nsystemfortheengine compart-

o4-poundportableextinguishersarepro-

boutthetank.Fulloperatinginstruc-

shernameplate.

xtinguishingsystemusescarbondiox-

ent.Carbondioxide(notto beconfused

otpoisonousbutis suffocating.

seinvolvinggasolineor oil,arequickly

heareawithcarbondioxidegas.This

ntandcreatesaninertatmospherewhich

r"deepseated"fires,suchas firesin

bstances,areextinguishedbyprolonged

tionofcarbondioxide.Inadditionto

bondioxideisaidedin extinguishingfire

reathe,butwill suffocateinanat-

de,cautionmustbetakenbeforeentering

s. Thoroughlyventilatethespaceinto

chargedto makecertainthatallportions

uldit benecessaryforapersonto enter

ghlyventilated,hemaydosofora short

h.

ercomebycarbondioxide,itisessential

e spacecontainingthegaswithin5

nsoovercome,givehimplentyof fresh

rationas inthecaseofdrowning.

e,restorethe systemtoitsnormal

oasfollows:

ylinderasfollows:

dfromcylindervalvebyturningswivel

seclearofcylindervalveand support

inginapproximatelynormalposition.

bebetweendouble-checkteeandvalve

ylinderwiththisconnectingtubeat-

utlet.

ps;thenremovecylinders.

PublicDomain,

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E

eadshaft andturningcounterclockwise

deofcontrolhead) untilclutchpinand

wninfig21.If systemhasbeenoperated

utpinandsealwire.

heshieldednozzlestomakecertain

nmatter.

shersystemcontrolhead.

edcylinderasfollows:

d tightenclampshandtighttoallow

hat mayberequiredinconnecting

bebetweendouble-checkteeandvalve

securely.

eadisin setposition(pinlinedup with

beforereinstallation.Insertcontrol


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,ANDM3A241

beforetighteningswivelnut,checkto

emainedin "set"position.Thentighten

Thefireextinguishingsystemrequiresno

insureits properoperation.Asthe

se,itmust bekeptinoperatingcondition

uentinspectionshouldbemadeto insure

eckredcapon safetyoutletofvalve.

eenprematurelydischargeddueto high

echargedimmediately.Thefollowing

med:

nspectentiresystemforanymechanical

tshieldednozzlesarefreeofall foreign

Weighcylinderstodeterminethecarbon

empttodeterminecontentbymeansof

eightandcarbondioxidechargeare

ebody.Proceedasfollows:

escribedinparagraph41e?(l).

btractfromthisweight theempty

valvebody.Emptyweightincludes

r,butdoesnotincludethe controlhead.

ofeithercylinderhasdecreasedtobelow

erechargedtoits fullratedcapacityof10

saredisassembledfromcylinders,

gthecam(seefig.20).Checkcableclamp

thatcabledoesnot pulloutofclamp.In

,a screwdriverwithnarrowheadmustbe

wdriverfollowsscrewintohole.After

tecontrolhandletomakecertainthatcable

decontrolhead shouldrotate,andthe

escribedinparagraph


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ANCE

ES

on 43

mechanism45

48

ricants58

9

g.22).a.TheWrightWhirlwind

r-cooled,radial,aviationtypeengine,is

omrearor magnetoend).

rclockwise

ap0.012inch

s0.012inch

ollowinglimits:

reesFahrenheit190

eit140


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,ANDM3A2

ter,generator,andfuelpumpare

fthe rearcrankcasesection(fig.22).The

heextremelowerendof therearsection.

eelendoftheenginewillbe referredto

eandtheotherendwill bereferredto

e.Theterms"right"and"left"areused

easviewedfromthe rear.Horizontal

eenginewill bereferredtowithrespect

LUG-

wingaccessories,adjustmentofcarburetor,andoilpressure.

kshaft.Directionofrotationisdetermined

engine,orinthecase ofsidedrives

kshaft.

llation.a.Construction.Thenine

radiallymountedon thecrankcaseand

shieldedconduitorharnesscontainsall

cludingthe high-tensioncables.Baffles

eenthefinnedcylindersfor cooling.

eismountedinthetankas shownin


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ENANCE

al,air-cooled.

C2.

es.

ries1,370Ib.

stemandrocker

wedatmag-

-8.

Top.

vemechanism.Theaccessorycase

eofthecrankcaseandhousesthegear

saccessories,suchasthe magnetos,starter,

Thesupplyof oilintheengine crank-

mpswhichdraw oilfromtheengineoil

eadbetweentheengineandfighting com-

atetheoilwithintheengine itself.These

haresupportedon thelowerleftside

oninthe caseofthemainpump,andin

aseoftheotherscavengepump.Themain

ctions:a separatepressurepumpanda

vengepumpreturnstheoilfromtheupper

oilfilter.Thescavengepumplocatedin

oilfromthe lowersectionofthesump.

cavengepumpsjoin togetherbeforerun-

he mainoilpumpincorporatesapressure

esaspring-loadedballthatriseswhen the

dandallowsthe excessoiltobedrainedinto

Pressureregulationisaccomplishedby

wclockwisetoraisethepressureand coun-

pressurewhichraisesorlowersthe tension

Theoilpressureshould bebetween50

inchinnormaloperation.

acetheoilpump assembly

eat connectorandoutletlineatY

nkageatcarburetorconnection.

vernor.


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1,ANDM3A246-48

e,studnut,and plainwasherfrom

npumpcastingandremovethepump

nkcase.Cautionmustbeexercisedto

utofthecrankcaseduringtheoperation.

ernor.

proceedinthereverseorder,being

egearproperly.

theoilpump,removethetemperature

olding thebulbinthe recess.Remove

pring,andstrainer.In replacingthe

asketisingoodconditionandcentered

Theintakepipesarefastenedto the

eachcylinderbymeansofa flangeand

erendof eachintakepipefitsintothe

kcaseandissealedin placebyarubber

manifoldiscomposedoftwosections,

oneforthe leftsideofthe engine.The

ountedrigidlyatthe exhaustportflanges

tletspass throughtherearhullplates

perchargerisusedto forcefuelmixture

akeports ofthecylinder.

moval.Certainsectionsofthemani-

htheengineremainingin thetank.The

tberemovedwiththeengineinthetank.

usedtoremovethe entiremufflerassembly:

lbowsbyremoving4boltson each

flercanbedisconnectedfromtheengine

mpingthemanifoldconnectionandpush-

oldsideupintothemufflerin orderto

22).

ess.Allpartsoftheignition wir-

preventradio interference.Theshielding

y partisdamageditmay bereadily

ngtheentireshieldingstructure.Theends

edwithan elbowwhichattachesdirectly

andfacilitateseasyremoval.Theigni-

ectedatregular intervalstoseethatall

ttheconduitsarenot crushedorbroken.


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E

ntadjustment.


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,ANDM3A249

ption.Dualignitionisfurnishedby

ntheaccessorycase.Therightmagneto

andtheleftmagnetofiresthe rearplugs.

edwithautomaticsparkadvance,are

terference,andareflangemounted.

Removethebreakercoverbyreleasing

e. Usingafeelergage,measuretheclear-

heldwideopenby thecam.Thisshould

4 inchwith0.012inchdesired.Toget

dicatethemaximumgap,theenginewill

thehandcrankonthestarter mechanism.

tweenthecontactpointsonthemagneto,

longcontactscrew,andturnthescrew

earancebetweenthecontacts.Checkclear-

ons.

hemagnetoendsoftheignitionwirescorrespond

firethesparkplugs,and nottothecylindernum-

nderNo.3isstamped"2"as itisthe secondin

ylinderfiringorder,clockwiseviewedatmagneto

mblyofthemagnetootherthantheoper-

doneonlybyordnancemaintenance

.Eachmagnetohastwooilholes,one

plateand theotheronthemain magneto

coveroilerlubricatesthebreakerend

magnet.Every400hoursofoperation,

ced,apply15dropsofoil inthefront

doiler onthemaincovershouldreceive

excessoilwillfoulthebreakercontact

ckatthebottomof thecontactbreaker

edwithoil.Ifoil appearsonthesurface

zedwiththefingers,no additionallubri-

however,saturateitwithoil, engine,

ent(fig.24). (1)Removethetwoy-

magnetocoverandtwosafetypins.

mpsatbottomand removecover.

ontactsattopofright magnetoand

ndgroundwire.Thereisno booster

eto.


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E

utingblocksandrotatethe engine

e twomarksontherotorgear coincide

magnetohousing.

thethree nutswhichholdmagnetoin

neto.

s holdingmagnetotoaccessorycase.

enthatthecrankshaftisnotturneduntil thenew

toput afewdropsofengineoil on

turnthemagnetountil thetwomarkson

omarksonthe magnetohousing.The

y tappingtoeachside.Continuewiththe

.

a.Thesparkplugs usedonthisen-

ttype,BG-314GSmodified,andare radio


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,ANDM3A2

val.(1)Atthetimeofthe50-hour

plugreplacementisfoundnecessary,the

ereplacedbyserviceableplugs.

gs fromtheengine.(a)Removethe

vertheengine.

orWrightengine.

nnectionwitha%-inchopen-endwrench.

mthecylinderrecesswitha sparkplug

o.140).

tefrombottomofhullunderengine

frontsparkplugs, removeinspection

g.

enchwithauniversaljointextension

ainplugsthelocationofwhichmakes

dinarysocketwrench.

vedfromthe frontandfivefrom

eachingdownfromthetopof thecom-


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CE

plugscanbereachedthroughthe opening

gine.

ugsin theenginedonotuse wrenches

nches long.Itispossibleto distort

iftoomuchforceis usedintightening

inders.Solidcoppergasketsareto be

ereplacedthe threadsshouldbecoated

oprevent"freezing"oftheplugs.

.

iption.Aboostercoilisprovided

uxiliarysparkacrossthe pointsofthe

ginestarting.The boostercoilswitchis

panel,andis usedtoconnectthebooster

meofthe100-hourcheck,orwhenever

sfoundnecessary,theunserviceableunit

ceableone.Disconnectcableswithshielded

removeboltsholdingcoil tobracket,and

ssembly,servicing,andadjustmentof

yordnancemaintenancepersonnel.


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,ANDM3A2

escription.A24-voltdirectelectric-

ne.Thestartershouldbe usedonlyfor

stnotbe usedtomovethetankwhenthe

sionismadeatthetopof thestarter

arterswitchislocatedontheinstru-

ilsto operateproperlyitshouldbe

estarter.Thefollowingproceduregives

dreplacementofthestarter.

switch.

uardcoveranddisconnectthecable

reorcotterkeysand thenutsholding

orycase.

verse theaboveprocedure./

rsaresufficientlylubricatedatthetime

quireanyfurtherlubrication.betweenmajor

.Description.Thegeneratorisflange-

ycasebelowthestarterandis heldin

tagecontrolboxdescribedin paragraph

tputofthe generator.

sareproperlylubricatedatengineover-

trequire anyadditionallubricantbetween


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ENANCE

generatorshouldbereplacedasfollows:

uardanddisconnectleads.

rkedtoidentifytheirproperposition

oldingthe generatortotheaccessory

etainingbracketnutandslide thegen-

veoilispresentin thegeneratoratthe

eratorshouldbereplaced.

.Description.Thefuelpumpis

cessorycasetotheright ofthegenerator.

0-hourinspection,checkforleakageat

fuelpump.Intheeventthefuel pump

quantityoffuel,thepumpshoulbere-

unit.

ewillbeobservedforremovaland re-

p:

es.Thetwomainvalvesare located

dopenreardoorsto enginecompartment.

tachedtopump.

andnutsholdingthepump totheac-

setheprocedure.

a.Description.Thecarburetorisat-

kemanifoldinthe bottomoftheengine

ecarburetorisproperlyinstalled,very

etweenmajorengineoverhauls.Afuel

earcenterofthecarburetorandmaybe

thelarge square-headedplugatthebottom

quareheadedplugis providedasadrain

chamber.Thestraineranddrainplugs

ntlytoremovetheaccumulateddirt.The

offbeforeremovingtheplugs.Theentire

ectedtoseethatall partsaretightand

tbecomenecessarytoremoveorreplace

gprocedureshouldbefollowed:


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,ANDM3A255-56

shut-offvalvesareclosed.

and drainlines.

-offandacceleratorlinkage.

onnectionsatflexibleconnector.

reandthefour boltsholdingthecar-

oldbaseand removecarburetor.Dis-

reversetheprocedureoutlinedabove.

ewcarburetorisinstalleditshould

Twoadjustmentsare provided,onefor

formixturequality.Thethrottlead-

r(seefig.22) issetso thattheengine

rpm asreadonthe tachometer.The

vedtothe right(lean)untilthe engine

eleveris thenmovedonenotchatatime

ngineoperatesevenly.

a.Description.Twoaircleanersof

ded,oneattherightand oneattheleft

.

ch50hoursof normalengineoperation

operation,servicethecleanerin the

36):

ts frombottomplateofcleaner,and

ssemblybyliftingup slightlyand

wiserotation.Takefluteassemblyout

mcup,andcleanthoroughly.Refill

specifiedinfigure12.Careshouldbe

theoillevelmark.

ps,makesurethat thecupassemblyis

on thecleanerandfastenwiththumb-

ventit becomesnecessarytoremoveor

oceedasfollows:

overengine compartment.

etconnectiontomanifold(twohose

aner.

nnectingcleanertosponsonside.


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E

relementwithcleaningfluidorgaso-

compressedairinreversedirectionto

hegovernorisusedtoregulate and

neaftertheenginehasbeenmanually

sdangerousoverspeeding.Theunitis

asebelowandslightlytothe leftofthe

ssealedandshouldnot betampered

engine.

ubricants.a.Specifications.

r1.

Oilisdrawnfromthe oiltankand

bytheoil pumpthroughafilterto allthe

herpartsoftheengine throughdrilled

vengepumpreturnstheoilto theoilcooler.

nthe pumpisadjustedtopreventthe

g80pounds.

e.a.Facilitiesmustincludethenec-

oistingfacilities.

gs.29 and30). (1)Openmaster


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,ANDM3A259

ut-offvalvesinsideandoutsidehull.

rmorplatesoverengine(%-inch

ors.

edgeof armorplatesoverengine

ldingshroudingtofrontsectionof

nch).

earmorplateswith A-frame.

omeliteexhaustpipefromclamps.

nscine,endview.

andconnectinghoses.

tsand bottomplate;remove3cups;loosenclamps

enclampfromenginebreatherhose andseparatefrom

pscrewsholdingaircleanerbodyto hull(%-inch

ner.

er.(Sameexceptthatthereis no

in"linetopumpand returnlineat

endwrench).Pluglines.

d"out"lines(1%-inchopenend

esattopandbottomof Hyconpump

withcloth.

raturegagecable(n/ig-inch).Plug


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E

gtemperaturegagecableatgenerator

terdrivecablebyunscrewingknurlednut.

wiresatgenerator.(Pliers,screw

dwrench.)

ngine,sideview.

wirefromstarterat starter.(Pliers,

-inchwrench).

oundwiresandboosterwireatjunction

dsection(%6-inchwrenches).

ateunderhull(%-inchwrenchand


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,ANDM3A259-60

ndwireatcut-offsolenoidandremove

rodclevispinbeneathengine.

xhaustpipes awayfromjoints(%6-inch

yrestbolts(l^-inchsocketandexten-

ench).

rapfrombanjo(%6-inchwrenches).

eatright ofcut-offsolenoid(7/ie-

relineat rightofcut-offsolenoid

.

oidandbracketfrombrace(%6-inch

ne(crankcasetoexpansiontank)at

ocatedovertop ofengine.(Hoseclamp

pipesupportbracketsfrombanjo

sherbracket,tube,andhornassemblyfrom

h;11/4-inch).

mpanionflange(%6-inchwrenches).

engine.

pliers,two%6-inchwrenches).

artmentwithA-frame.Setinstand.

mps,ifnecessary.

s,screws,etc.,intoolboxuntilreadyfor installation

ersetheaboveprocedure.

.31).Valvetimingcheckandclear-

ginecold):

ersandgasketsfromallcylinders.

s.

4-inchhexelasticstopnutswhichhold

her,andattachthetiming scaleportionof

stremoved.Insertthetopdeadcenterin-

oleofthenumberonecylinderand deter-

s follows:

he normaldirectionofrotation(coun-

gattheflywheelorforwardendofthe

thetopcenterindicatorregisterszero.


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CE

eron theenginecowlinsuch position

adingedgeofthe scalepreviouslyat-

nthe timingscale.

ankshaftinthesamedirectionuntil

s gonepastandreturnedtothe zeromark.

mingscale.

ofvalves.

kwardaboutone-quarterofa revo-

warduntilthetimingpointerindicatesa

midwaybetweenthetworeadingspre-

1pistonis nowonthetopdead center.

nteron thecowlsothatit indicates

cale.

erintakevalveclampingscrewonrocker

screwuntilthethreadis flushwiththe


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,ANDM3A2

tofvalverockerarm.

tofvalvepushrod.


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ENANCE

thedirectionof rotationuntilNo.9

eginstoopen.Tap thepushrodendof

ylinderwithapieceoffiber oramallet.

alvesofNo. 1cylinderat0.070inchby

andturningadjustingscrews.

No.1intakevalvewithfingers.Rotate

ofrotationandnote thepointatwhich

olongerturn.Thisis thejointatwhich

shouldoccurfrom3 to7 beforetopcenter.

stheexhaustvalvewillclosefrom2 before

enter.

agreewith thatspecifiedabove,then

andif thetimingisstill foundtobeoff,

dbeadvisedtoeffectadjustmentofthe

proceedtoadjustthevalvetappet

erarmrollersto0.010inch withthepiston

ningofthepowerstroke(fig.31).Also

whichwasdisturbedasperd above.

forproper clearanceandadjustto0.010

kerboxcoversonallcylinders.Replace

n66

67

s.Fourfueltankswitha total

eprovidedforthe enginefuelsystem.

f32V2~gallncapacity,arelocatedinthe

compartment,andtwohorizontaltanks

ocatedoneineachsideof theenginecom-

olinetankfortheauxiliarygenerator

nsis locatedintheleftrearcorner ofthe

nkscanbedrainedbyremovinga

etank,directlybeneaththefillercap.To

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,ANDM3A2


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E

-inchpipepluginthefloor locatedbeneath

moved.Todrainthehorizontaltank,

ocatedattherear andbottomofsponson,

kswillbereplacedwhenexcessrusti s

elop.Fueltanksmayber emovedas

aintanks.

.

.

tbottomofengine.

cketsoneachside.

nnections.

e.

Draintanks.

dscrewoutshut-offvalve.

onson.

kwithtophalfof housing.

wovalves(fig.35)locatedontherear

tmentundertheengineoil tankandtothe

nnelcontroltheflowfromtheright and

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,ANDM3A2

eachtankis providedwithaseparate

ehandlesforthe verticaltanksextend

turret,intheroofof thehull,whilethe

anksareplacedin thecountersunkholes

kofthefiller caps.

ertheoil tankintherear ofthefighting

rnedoffwheneverthevehicleisstoppedfor

e.

eaner.

offelectricallyatthecarburetorwhen

eansofatoggletypeswitch(fig. 8)located

of theinstrumentpanel.Pressingthe

callystopstheflowof gasolinetothe

ne.

nandoperation.Aprimingpump,

board,providesameansof injectinga

neintakemanifoldtofacilitatestarting.

rimerdrawsachargeofgasolineinto

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E

gthereturnor chargingstroke,the

malldistributionhousingfromwhichfine

akemanifoldpipes.

thanafewstrokesarerequiredto prime

kingonthei nstrumentpanelendofthe

dforleakage.Tostopleakage,compress

e packingnutlocatedbehindthepriming

entpaneluntilthe leakagestops.

(1)Disconnectinletanddischarge

lstrainer.

dremoveprimerplunger.

gflangetypenuton frontofinstrument

ription(fig.37).Thefuelstrainer

peinstalledinthefuelsystembetweenthe

uel pump.Itislocatedin therightrear

artment.

ainerscreencanberemovedandcleaned

uareplugonthe sideofthestrainerand

edledrainvalveatthebottomof thestrainer.

electricallyoperatedfuelgagesare

atednear theoilcoolerinthe rearofthe

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,ANDM3A265-68

nt.Thereargageisconnectedtothelarge

eisconnectedtothelargeright tank.

toggleswitchisprovidedonthefront

easmalllightfor lightingupthegages.

erationwhentheignitionswitchis

tion(fig.35).Gasolinefromany

ksflowstoa centralheader.,Fromthe

astrainerbya pumptothecarburetor.

edthroughareliefvalveand returnedto

,rightsideofbulkhead.

orlockandexcessgasolinepressure.An

omthe headertotheprimingpump

panel.

ne.Commercialmotorgasolinehav-

ispreferredandshouldbe used.In

newithanoctaneratingofnotless than82

ce

ineiscooledbyanairblast producedby

ineflywheel.Thefandrawsairthrough

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ENANCE

andforcesitbetweenandaroundthe

ne.Thewarmair passesoutthrough

doors ontherearofthe tank.Airductsare

fflesbolted aroundandbetweeneach

.Ashroud formsafurtherducton the

l.

nance.Atthe100-hourinspection

ingfins ontheenginecylindersandthe

ndbaffleswill becleanedthoroughlyofall

l boltsonthefanri ng,baffles,andfan

4

bly77

8

9

rvesasameansof applyingengine

thevehicle,whichconsistsofpropeller

ential,finaldrives,andsprockets.The

neflywheelandis locatedinthefrontof

tchallowstheenginetopick upload

ars.Whentheclutchi sengaged,the

ousingexerttheirfullpressureagainst

theenginepower togothroughtothe

sdepressed,thepressureplateis pulled

,compressingthe clutchsprings,allowing

freeofthepropellershaft.Engine power

ngthroughto thepropellershaft.

rhubbearing(fig.39) isgreasedas

clutchisdisassembledandcleanedas

h100-hourinspection.

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,ANDM3A272

ndclutch.

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E

Faultyoperation,suchasslipping,

tedby thedriver,shouldbereportedto

nt.a.Astheclutchfacingwears,the

s reducedandintimethis willresult

the floorplateandcauseclutchslippage.

ocheckthepedalclearanceatintervals

fficientfreepedalplaytopermitengage-

eclutchpedalis madebylengthening

sothat%-inchclearanceexistsbetween

andflangewhentheclutchis engaged.

OBTAIN

EN'CLUTCHRELEASE

fclutch.

eclutchisprovidedwitharelease

tchinthe"out"position (disengaged).

hownin figure40arepartof therelease

ringsshouldalwaysbeinspectedwhenthe

arelubricatedatleast onceeachday

eoilasprescribedinfigure 12.

retobe removed,firstremovelubrica-

ewwhichlocksnutontoshaft.

oremovetheclutchforinspectionand

ates,bearings,orgreaseretainers,first

tchfromthevehicleas directedinsection


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,ANDM3A2

ee fig.41).Punchmarkpressureplate

part,aseachunitis carefullybalanced.

rewsthatholdclutchhousingassembly

essixcapscrewsholding releasearms

assembly(6).

wsholdingplatesfromslidingoff

).

platesandthetwofacedplates(9 to13

yofclutch.

eelfromthe enginecrankshaft.Any

willbe reportedtotheordnancemainte-

tchhousingisnot tobeattempted.

embly.a.Washallparts.

ndflywheelforany indicationofscores

heckmetalplatesforbursandcracks.

tesforwornorloose facingandloose

seethatthey movefreelywithineach


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ENANCE

otifyordnancemaintenancepersonnel.

andremedialmeasuresareasfollows:

useProbableremedyoraction

fyordnancepersonnel.

plateReplaceplate.

Cleanouteredgeof pres-

fplatesCleanplates.

es.

Replacespindle.

dReplaceyoke.

ng.a.Clutchouterhubbearing

eshouldbeusedin removingthisbearing

emoval,itshouldbecleanedin dry-

ed,packedwithlubricant,orreplacedwith

.

earing,itisessentialthat itbepressed

twiththe seatintheclutchhousing.

g.a.Theclutchinnerhubbearing

sameprecautionsandtreatmentaretobe

eplacingthisbearingasfor theclutch

ringis lubricatedonlybypackingat

equently,itisnecessarythatthisbearing

scribedinfigure12 beforeitispressed

siveamountoflubricantintheinner clutch

operassembly.

hplatesprovidetheproperamountof

oothapplicationofpowerwhenstarting,

rivewhenfullyengaged.Wornordam-

eplacedwithnewor rebuiltplates.

Theorderofreassemblyis tofollow

ntakingtheclutchapart,exceptthatthe

acedbeforetheclutchplates(9to13,

eplacescrewsandwirethatholdplates

kenin replacingflange,asthelipsof

ut. Useshimstockorfeelergagesto

tospindlesoasnot toruptureseal.


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,ANDM3A281

NG

NG

aftanduniversaljoint.


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ENANCE

ershaft(fig.42)transmitspowerfrom

onandthe restofthepowertrain. It

ointsat eitherendtopermitoperating

missionandclutch.Itisinclosedina

enterof thefloorofthecrewcompartment.

versaljointsandsplineareequipped

replacedwithpressurefittings forlubri-

naccordancewithfigure12.Inorder

dplateson theendsofthetunnel mustfirst

hefour capscrewsholdingeachguard

aointbearingsand theslipjointgrease

e mostapttowearout.Excessivevibra-

ellershaftwhileit isinmotion,shouldbe

onnel.Theslipjointgreaseseals shouldbe

ngthe100-hourcheck.

eauthorizedtoremoveandreinstalla propellershaft,

uctionsfromordnancepersonnel.Thereplacementof

otherpropellershaftmust notbedonebyusing arms,

ationisreceivedfromordnancepersonnel.Whenin-

isimportantthatthemarkson theslipJointline up.

TIAL,ANDSTEERINGBRAKES

tial85

kes87

ke88

ever89

rential.a.Transmission.The

ardspeedsandonereversespeed.It is

hird,andfifthgears,andconstantmeshin

brakeis builtintothetransmissionand


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,ANDM3A285-88

eleftof andbehindthedriver.Thisbrake

vehiclehasbeenbroughttoa stop.

rentialiscalleda"controlleddifferential"

o transmitenginepowertothefinaldrive

controlledbythesteeringbrakes,inorder

ered.

esteeringbrakeassembliesarelocated

ential,betweenitandthefinaldrives.Older

ooster(Hycon)systemattachedtosteering

brakes.Theadjustmentofthe

elyimportantandonlyspeciallyqualified

mittedtoperformit.Figure45i llustrates

ringbrake.Bothbandsshould beadjusted

he leversthensetsothat thebandscontact

ewhenthesteeringleversarepulled back

sketfromthe brakedrumhousingcover.

a1y16-inchdeepsocketwrench(supplied

andengagethis wrenchoverthebrake

nut one-halfrevolutionclockwiseto

ngnuthasacylindricalsurfaceonthepressureend

ce.Itis,therefore,imperativethatthiscylindrical

gainstthecrosspin whentheaboveadjustmentis

llingbackonthesteering leverwhich

and.

draulicboostersystemgreatlyinfluences

ybefound thattheaboveadjustment

toryoperation.Inthiseventordnance

houldbenotified.

brake(fig.43).Theparkingbrake

tfor itslockingaction.Thisjointcon-

endofthecrossshaftto whichisfastened

ustmentofthislinkageshouldbe such

keleverwill causethetoggleactiontogo

ockedpositionafterseatingthebrakeshoe

nicalbrakedrum.Toadjust theparking


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E

omtheeccentricendof thelevercross

her.

untiltheeccentricendofthe shaftpasses

whichisthreadedintothelink.

mtheshaft.

ckwise,thusscrewingitoutfromthe

ornormaladjustmentstotakeup for

keadjustment.

eyeone-halfturn atatime,slide thecross

ythebrake,and repeatthisuntilthe

eisobtained.

hiftlever(seefig.46).Ifthe gear

norbent,it canbereplacedasfollows:

mnut.


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E

r.Onearmof theyokeisstraighterthan

necessarythatthestraightestarmbeon

henreplaced,inorderthattheshifting

bleto contactallshifterrails.

tofgearshiftlever.

smission. (1)Thetransmissioncon-

hiscirculatedbyasmall pumpbuilt

.Oilisadded andthelevelischecked

cap,whichislocatedtotheright and

eat.Abayonettypeoil gageisbuiltinto

mingattheendof arun.Itis necessary

ethelevelischeckedaridadditionsare

tothefullmark.Use oilasspecifiedin

bedrainedatintervals,asindicated

the removalofaplugin thebottomof

hedfromunderneaththetank,through

ectlybelowthedrainplug.


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E

VEHOUSING

EMBLY

ndbrakehousing.

NS

94

tion(fig.48).Sixtwo-wheeled

pensions,boltedtothehull, supportthe

cksaredrivenby sprocketsonthefront

eidlersat therearendof thehullare

tanttensiononthetracks.Theweightof

ackiscarriedbysteeltrack-supporting

spensionbracket.

7).a.Description.Hubassemblies

procketstoa hub,whichinturnis bolted

aldriveshaft.Thesesprocketsandhufe

geableasunits,andshouldbetransposed

nal driveshaftswhentheteethhavebeen

mbly(see fig.47).(1)Slackenanddis-

esprocket.


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,ANDM3A286

s.(1)Slackenanddisconnectthe

ofsuspension.

achspringandinsertj ackstudsinto

fspring.

elsbyscrewingjacknut onthestud

cketasshowninfigures53 and54.

efttoraise wheelforremoval.

ogiewheel.

mpscrews.

lacingjackatedge ofhullfloor.

geons,usingaslide hammerorscrew

msarenow freeandcanberemoved.

crewingjacknut.

acknuttoreleasespring, thesocketwrench

houldbeheldto preventthejackscrewfromturning


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E

anextraprecaution,ajackplacedunderthe spring

withthe jacknutwhenreleasingthetensionofthe

d,removethejackscrewandthe spring

eretainer.

olt.

r.

bly.

onents.


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,ANDM3A2

reversethe procedure,usingjack

andspringitin place.

acewornordamagedwearingplatesas

earingplatefrombogle leverarm.

on(fig.55).Mostofthemediumtank

bbertrackshoeunits,eachassembledwith

sembledintoanendlesstrackbythe

charesecuredtotheendsof thepinsby

nectionsalsoserveasguidesto keep

thebogie wheels,idlers,anddrive

ftheconnectionsserveasdrivinglugs

e finaldrivesprocket.Someofthetanks

intedtrackshavinga steelwearing

userdesignandaninside cushioning

bbertrackshoesareofthereversible

edwhenwornto suchanextentthatfurther

sectionof themetallinktobecome


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E

agedorunserviceableunitsshouldbe

dreplacedwithserviceableones.

).(1)Makesurethattankis on

DROLLER

ofbogie;firststeps.

MPRESSIONBOLT

RINGS

TS

RRIAGE

tm 9-750 m3, m3a1 and m3a2, 1942

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