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7/28/2019 Tm 9-731B M4A2, 1943
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RDEPARTMENT,
anuary13,1943
onofthe
sherBodyDivision,GeneralMotorsCorporation)
UCTIONS
-53-17
andcontrols...6-1318-34
4
4
28-3075-76
orusingarms... 31-3277-85
ualconditions...3386-91
2-95
3596-99
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NSTRUCTIONS
ance
ndequipment...
rtsandaccessories
ks
andinstrument
unit
mandcontrols...
mentandstorage..
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RIAGEM10
shaft,transmission,differentialandfinal
ntpanelandmanyotherunitsandaccessories
areidenticalwiththose usedinthe3-Inch
yOperator'sManualforMediumTank
erinformationmaybeusedasa reference
servicingthose unitswhicharecommonto
raryOperator'sManualTM9-752Aforthe
,M10,isrevised.
applytobothvehiclesin mainorinpart.
ndcontrols...............6-12
........'............16-21
22-30
ualconditions...............33
.......................34
35
ance.......................36-37
ndequipment...............38-39
41-72
.......................73-78
.........79-84
-94
.........95-97
.......................99-109
s..........................110-115
andinstrumentpanel.117-123,125-131,
145-150
mentandstorage.............151-153
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UCTIONS
t................2
kM4A2.........................4
.5
tendedtoservetemporarily(pending
ompleterevision)togive informationand
heusingarms chargedwiththeoperation,
epairofthismateriel.
GEMENT.
ghX)containsinformationchieflyfor
personnel.
ughXXVI)containsinformationin-
anceoftheusing armspersonneldoing
ofPart II,listsall StandardNomen-
anuals,andotherpublications,alsoTraining
erieldescribedherein.
TANKM4A2(figs.1,2,3,and4).
nkM4A2isa heavilyarmoredfull-
eredbytwinsix-cylindertwo-cycleliquid-
hiefarmamentisa 75-mm.guninacast
mountedon anall-weldedhullofarmor
retcarriesacombinationmountfora
machinegun.The turretplatform,orbasket,
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chmaybetraversedthrough 360degrees
electric-hydraulicdrive.Thecombination
to beelevated25degreesabovethehori-
egreesbelowthehorizontal.Theturret
vatedordepressedbyoperatingthe elevating
o-stabilizerisinoperation,thegunis elevated
olledbytheelevatinghandwheel,andthe
allyholdsthegunsteady,atanyquadrant
it hasbeenlaid,whilethetankis inmotion.
steelturrethasa thicknessof3inchesat
desandrear,and 1inchontop.The all-
te,2inchesthickatthe front,1^inches
%inchontop.
are mountedinacompartmentatthe
neisacompleteunit,withits ownfuelsystem,
gsystem,andradiator.
oinedbymeansofaheavyjunctionplate
bleclutchhousingandpowertransferunit
nginedriveshafts carrygearsmeshedwith
nedrivenshaft,whichisconnectedto
chenginehas itsownclutch,betweenits
earunit.In normaloperation,thetwo
thesingleclutchpedal,buteither clutch
ontrolonthehandthrottlepanel.The tank,
dwithonlyoneengineshouldthe otherengine
tof thepowerunitis 375horsepower.
trolthefuelfeed,toli mitmaximumengine
oad.Withthisgovernorsetting,the tank
withboth enginesrunningat2100rpm.
ating,atankspeed of20mphmaybe at-
egenerousmarginofpowerinreserve when
gatfull governedspeed.
eredby meansoflevers,whichoperate
piecedifferentialhousing.Brakingiseffected
ngbrakeleversat once.Ahand-operated
adrumon thetransmissionoutputshaft.
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ransmissionparkingbrakeis eliminated
versmaybe lockedinappliedpositionby
missionhasfive forwardspeedsandone
dditiontothetwo generatorsofthetwin
ygeneratorunit,consistingofa generator
ledgasolineengine,isprovidedforusein
entheDieselenginesare notrunning,andto
urret-traversingmechanism,gyro-stabilizer,
yloadonthe electricalsystem.
75-mm.gunandcal..30machinegunon
theturret,thetank carriesacal..30machine
ntinthefrontplateof thehull.Acal..50
aftfireiscarriedinside theturret,tobe
cketon theturrethatchring,whichpermits
al..45 Thompsonsubmachinegun,carried
ed throughthepistolportin theleftside
crewconsistsoffivemen.The driver
ank,tothe leftofthetransmission.The
sin therightbow,tothe rightofthetrans-
dthebowmachinegun.Thetank commander
theturret,justto therightofthe 75-mm.
ationis almostdirectlyinfrontofthe com-
onisto theleftofthe75-mm.gun.
nkisprovidedbytwo hatchesinthebow
e turret.Forusein anemergency,aquick-
ovided,inthetankfloor directlybackof
vecrewstationsthereisa periscope,all
tedsothattheymaybe rotatedforobserva-
ed toraiseorlowerthe lineofvision.The
ectedtothegunmountby linkagethatkeeps
ntalinementwiththegunasthe gunis
egunner'speriscopeisfittedwitha telescopic
aybemoved,independentoftheperiscope
.Forthedriverand assistantdriver,direct
ntalslots inthehullfront plate.The
protectivecovers.
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gsystem,Dieselfueloil tanks,and
powerunit, andthegasolinetankofthe
e,arefilledfromthetop ofthehullon right
ftheturret. Eachfilleropening(seefig.26)
atehavingraisedletters,sothat theymaybe
nkisequippedwithtwo-wayradiofor
andwithatelephonesystem(interphone)
w.
eld.Aremovablefoldinghood,withsafety
edfortheprotectionof thedriver.Itmaybe
cialfittings,tocovertheopenedhatchover
shieldhasan electricwiperandanelectric
heircurrentthroughaflexiblecablethatcan
socketontheinstrumentpanel.
s.AllM4mediumtanks(M4A1,M4A2,
megeneraldesignand size,andcarrythe
denticaltransmissions,volutespringsus-
hoetracks(steelor rubber).Otheridentical
rretplatform,gyro-stabilizer,combination
gun (cal..30)mount.AllM4A2's,produced
vethesametwinDieselpowerunit,and all
hulls ofweldedconstruction.M4A2'sare
orthree-piecedifferentialhousings.The
differfromtheM4A2in theirpowerunits
differenttypes).
hM4A2MediumTankhasaserial
hecrewcompartmenttotheleft ofthe
etankserial numberandmanufacturer's
data.Referto theplatebeforeordering
onfusionofmodelsandmanufacturers.
476Ibs.
reinch(withrubbertracks)13.2 Ibs.
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racks)83in.
t.11%in.
el
wo-cycleengine(6cylinderseach)
46,Series71
..U. S.ArmySpec.No.2-102B,Oct.2,1941
engine)6
x5in.
ne)425cu.in.
sureat1000rpm500Ibs. persq.in.
Nearesttofan
4-2-6-3-5
lutionsfor100crankshaftrevolutions...137
ginescombined)375
lershaft880Ibs.-ft.at1500 rpm
dduringhalts 600rpm
espeed2100rpm
speed2250rpm
4490Ibs.
andcoolingsystem,withcoolant.5120I bs.
eachengine,
ors15gal.
ntorear ofgenerator)65^in.
includingaircleaners)59%in.
adeto bottomofoilpan
090Ibs.
sion,differential,andfinaldrives,
emblies)8035Ibs.
wearlymodelM4A2MediumTanks
l..30machinegunsin afixedmountinthe
mamentlistedhere.
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tedincombinationgunmountM-34).
1919A4(combinationturretmount).
1919A4(flexibleballmountinfrontplate).
2HB(flexibleracemountonturrethatch
5Thompson,M1928A1(carriedonbrackets
gun,M1928A1,cal..30,M2.
ercentH.E.,40per centA.P.,
s
ercentA.P.,20 percentTracer.300rounds
ercentA.P.,20 percentTracer.6,750rounds
660rounds
ntationM2,2OffensiveM3w/
mite12rounds
ont3in
360degreestraverse.
SCR-528orSCR-5381
5061
cover1
orange,green3
l-steel).
2^6in.
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ertracks)4832sq.in.
hicle148gal.
4^gal.
torfueltank)17.3qt.
completewithtankeach32qt.
each24qt.
each8qt.
^qt.
ch1 qt.
reach2^qt.
h2%qt.
sion,one-piecedifferential,
sion,three-piecedifferential,
.S.Army2-97A)
system2^qt.
r1qt.
hanism(Oilgear),complete
my2-96A)
ers16pt.
ch15gal.
ustainedspeedonhardroad 25mph
riods30mph
gability60percent
ngability60percent
nkwillcross100 in.
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SANDCONTROLS
ntrols6
3
NONCONTROLS(fig.5).
rottle.Thefootthrottle,oraccelera-
es,isatthe leftofthetransmissionhous-
er'srightfoot.Hand-operatedthrottle
e,aremountedwithineasyreachof the
aloperationthe enginesarestopped
es.
ringlevers(seefig. 5)aremounted
river'sseat.To steerthevehicle,pull
detowardwhichitisdesired toturn.Pull-
downthe trackonthatsideandcauses
cktobecorrespondinglyincreased.
backwithequalforceonboth steer-
nor stopsthetank,dependingonthe
kingbrakeleveris locatedonthe
smissionhousing,totherightofthe
ratesona conicalbrakedrumattached
shaft.Onlater modeltanks,thetrans-
minatedandbothsteering brakesmay
onbytripping apedal.CAUTION:Always
ngbrake(s) arereleasedbeforestarting
parkingbrakeisneverto beusedwhile
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SANDCONTROLS
,locatedalongthehullleft sidecon-
foot,disengagestheclutchesofboth
eor bothoftheclutchesmaybelocked
tion)by depressingthepedalalltheway
controlson thehandthrottlepanel(see
otride theclutchatanytime,as serious
esult.The drivermustkeephisfootoff
uallyoperatingtheclutch.
transmissiongearsfor speed
ansofthegearshiftlever,mountedon the
thedriver.(Seefig.5.)The positions
e variousspeedsareshowninthedia-
nis thesameasinautomobilegearshift-
iftleveris equippedwithalatchtopre-
tofirstspeedor reverse.Thelatchmust
ownthebuttonon thelever,toengagefirst
TION.
d,thefollowingprestartinginspection
ertrainunit,fillif necessary.
etsof tanks,fillifnecessary.
y,bothengines.Refillas necessary.
valves(emergencystopbuttonsand
onditionofportablefireextinguisher.
szero withbatteryswitchopenand
catenormalshut-offreadings.
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SANDCONTROLS
ns
nletlineshut-offvalveon topofin-
nlessairheaters aretobeused.Close
air heatersareused.
ers,clutchpedal,acceleratorpedal,
koutsandhandthrottlesoperatefreely
ndwatchammeterandvoltmeter.If
edischarge,openbatteryswitchimmedi-
voltmetershouldnormallyread251/2to 28
wgun.
ones.
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SANDCONTROLS
OR
MP
WITCH
H
TON
GAGE
EGAGE
H
GAGE
T
LB
P
MP
FF
C
T)
A
T)
UTLET
LL,
T,
D
A
GHT
nelLegend
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evel,fill ifnecessary.
onditionoffixedandportablefire ex-
,addwaterifnecessary.
ooroffightingcompartment.
valve.
etlockingmechanism.
erationofturretweaponsandturret.
mechanism.
munition,flags,fieldequipmentand
fnecessary.
siondevicesforbreakage.
nall visionandfirecontroldevices.
ntsfor defectiveperformance.
ns, sightingequipmentandaccesso-
onofsprockets,bogies,springs,guides,
ngrollers,andidlers.Tightensprocket
tightness,andtension.
rsforwear.
earoftrackconnectorwedgesand
e.I fnotinuse, checktoseethata
e.
leanandcorescompletelyopen.
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SANDCONTROLS
e inspectionplatesareinplaceand
raincoversandplugsarein placeand
nk foroil,water,andfuelleaks,
traceisclearof anyforeignmatter
tionofturret.
rbreaks.
dfuel leaksinenginecompartment,
mentdoorssecurely.
ies(pioneertools)arepresent.
oolantandrefill asneeded.Besure
penbleedervalveswhenfillingandclose
torfuel,fillifnecessary.Testauxil-
NS,
nstartingmotor(seefig.23) andits
einstrumentpanel(fig. 7).
valve.
pedalall thewaydown,orlockout
rteriscrankingits engine.
esforwarduntil theyarefelttoseat
Lowpressureoil indicatorlightsonin-
onwhenhandthrottlesare movedintoidle
atatimeby pressingfirstonestarter
Do notpressbothstarterbuttonsat once,
nthebattery.Startingboth enginesat
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d)bymeansofasingle startermustnotbe
eoverloadon.thestartermotor.Ifengine
econds,releasestarterbuttonandcheck
c).
rted,itmayberun independentlyof
edthattheclutchofthe secondenginebe
tedand usedtostarttheseconden-
smethodisto beusedonlywhenoneof
tedin thenormalway.
personnelshouldattempttostart
owing.(Seepar.8e.)
e'beenstarted,set thehandthrottle
peedsat800 to1000rpmforthe warm-up
eraturegagesread160F(71C)andre-
nd/ortheclutchpedal.
Whenthetemperatureisbelow40 F
ure,whichutilizestheair heaterbuilt
usedtostartfirst oneengineandthenthe
s inneutral.
(seepar.10 d).
erfuelinletlineshut-offvalve(seefig.
nel.
ewide.
gnitionswitch(seefig.7) onthein-
ump plungerontheinstrumentpanel
erclockwise.
andholditin firmly,whileoperating
mooth,evenstrokes,using afirmpressure
hepumpingstroke.(Ifthe weatheris
tionalstrokesoftheair heaterpumpafter
auseaftereachstroke,willhelpwarmup
mstalling.)
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SANDCONTROLS
release,the starterbuttonand
etoavoidracingthe engine.
gnitionswitchpromptly.CAUTION:
amagedifthe switchbeleftontoolong.
umpplungerallthewayin andturn
catchengages.
gh(10) tostartthesecondengine.
shut-offvalve.
vebeenstarted,adjust handthrottle
peedsat800 to1000revolutionspermin-
orthewarm-upperiod,andlockthe
ownthe lockinglever(betweenthe
ully,releasebothclutchlockouts,
lowly.
achednormaloperatingtemperature
beforestartingthetank,releasehand
hhandleversto theidlingposition.
Attemperaturesabove40F(5 C),
eused.Startoneengineand thenthe
s inneutral.
sall thewaydown,thenmovethem
,orlockout theclutches.
tonandholdit firmlyuntilitsengine
tsecondengine.
ninstrumentpaneltomakesure both
thandthrottleleversto equalizeengine
1000 revolutionsperminute,andlockthe
y.
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rmedup,andalwaysbeforestarting
ndleverstoidling position.
aseonlyoneenginecanbe startedby
edinb andc,preceding,thesecond
dbycrankingit withtherunningengine,
ockedout,orclutchpedalfully
ttleleverofthe runningengineto800to
teonits tachometer.
tsreleased,slowlyreleasetheclutch
otthrottlegraduallyto maintainthespeed
estarts,againdepress theclutchpedal
evers toequalizethewarm-upspeedsat
rminute,then graduallyreleasetheclutch
rmedup,andalwaysbeforestarting
eversto idlingposition.
ingbytowingshould bedoneonlyin
chinstances,thestepsoutlinedbelow
oil,and coolingsystemtodetermine
uldbeplacedin thelowestgear.
edshouldbeplacedinthehighest gear.
gineclutches,then,afterthetowed
otherclutchshouldbe smoothlyengaged
fuelposition.
ningover,movethethrottletothe
enginefires.Iftheenginedoes notstart
pthevehicleand rechecktodetermineif
art.Donotcontinuetotow aDieselpow-
startreadily.
withthethrottlein theidleposition,
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SANDCONTROLS
willmovetheinjectorrackpositionto no
rnedoverfasterthanidlingspeed.
mperatureis40For lower,operatethe
s engagedtoturnovertheengine.
eby towing,starttheotherengine
gine,observingthe ruleslistedind, pre-
asstarted,theoilgageshould be
notindicateoil pressurewithinone-half
beshutdown andaninvestigationmade.
ghts(seefig. 7)shouldcomeonwhen
outofthe nofuelposition,andcontinueto
heyareautomaticallyturnedoffwhen
hedasenginespeedisincreased.Iflights
eedincreases,stopenginesandcorrect
ee par.45j).
idlingatspeedof800 to1000revolu-
stfiveminutes.
K.
oroughlyfamiliarwiththefunctionand
s(fig.5) andinstruments(fig.7)before
k.
rmedup, andallinstrumentsshowing
sreadyto start.
ke.
ypressingclutchpedaldownto the
Disengagelockouts.)
gear(seefig.6).NOTE:Normal
d,aremadein secondgear.Firstgearis
maneuveringthetankinchbyinch,orin
tingthetank upagradeor indeepmud
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utchpedal,atthe sametimedepress-
ON:Donotattemptto movethetank
eaid ofpersonneloutsidethetankserv-
rtedandpickedupspeed,releasethe
eclutchagain,then movethegearshift
gearposition.Releasetheclutchand
pickuptheload.
operationsisrepeatedfor eachshift.
n thehighestgearthatwill permitthe
overnedspeed(2100 revolutionsper
ketheDieselenginelabororlug; shift
theenginespeedup.CAUTION:Donot
mustkeep hisfootofftheclutchpedal
ousdamagetothe clutch.
r,thetank mustbeata deadstandstill.
dling speed,holddowntheclutchpedal,
onthegearshiftlever,and moveleverto
g.6). CAUTION:Backingthetankshould
utanobserveroutfrontto directthe
right-handsteeringlevertomakea
dleverforaleftturn. Thisactionslows
e oftheturnand speedsuptheother
erisneeded.Asthe driveranticipates
readytoopenthe footthrottletoagreater
harpnessoftheturn.
esstheclutchpedal,releasethethrottle,
th steeringleversatthesametime.
atedonthetransmissionhousing,
rkingneverwhilethetankisinmotion.
watertemperaturegage,andtheoil
stsatisfactoryindicationsofengineper-
cationsofanyoftheseinstrumentsappear
shouldbethrottleddownandthecause
eratureshouldnotexceed190F(88C)
ditions(seepar.83b).
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E.
ethe footthrottle,andletengineslowto
otions,pushthehand throttlesdownand
thewayupto theoffposition.
RATION.
fficultiesarelargelyeliminatedbythe
.53 a),providedthatthelubricatingoil
radeforthe existingtemperature.
onditionsitmaybenecessary,inorder
xercisespecialprecautionsinlubricating
mament.TM9-850givesinformationcov-
tofsuchequipmentduringextremelycold
ationinextremecold,seeSectionVIII.
RUNIT(figs.143and144).
rygeneratorisusedto keepthetank
eDieselenginegeneratorsarenotoperat-
outputof theDieselenginegenerators
nit,turret-traversingmotor,gun-firing
relectricalinstallations,imposeaheavy
nit, whichismountedinthehull compart-
o theleftrearof theturretplatform,or
lt1500-wattgeneratordirectlydrivenby
gasolineengine.Agovernorcontrolsthe
oads.Onthecontrolbox,in frontofthe
hindicatesthechargingrateof thegen-
he starterbutton,andachargingcircuit
thecircuitbreaker.Thenormalcharging
eryis 50amperes.Withafullycharged
eratorammeterreadingshouldbe3to 5
wn fuel(gasoline)tank,holding17.3
ghthe fillerport(seefig.26) marked
o theleftrearof theturret.
rproperlubricationofthe unit,%pint
ustbe thoroughlymixedwitheach
efuelis putintothetank.Thorough
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SANDCONTROLS
ubricatethe unitproperlyandtopre-
ug andtheintakeandexhaustports.
ble,useSAE50.)
onthefuel filteratthebottomof the
32F (0C),closethecarburetorchoke
ontop ofthecarburetor,directlybehind
penwhenthe leverisagainstthestop
henthe engineiswarm,thechoke
in,andreleaseitas soonasthe
y,openthechokepartway,thengradually
itionasthe enginewarmsup.CAUTION:
das athrottle.Theautomaticgovernor
per speed,atallloads.
iarygeneratorunitmaybe startedby
sonthemagnetoshield.
f theshield.
counterclockwiseontheexposed
ectricstarting(par.13c.(2).
pulltospin theenginequickly.
uxiliarygeneratorshouldbeinopera-
o-stabilizerunit,turretpower-traversing
phones,andwhenanyofthesolenoid-
ed,if theDieselenginegeneratorsarenot
are runningandtheammeteronthe
catesthatthebatteryis discharging.
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operation,theheatfromthe gasoline
ntothe Dieselenginecompartmentby
ratorengineblower,onwhichthe engine
armaircanbe directedintothecrew
thedoorattheend oftheairduct.
engine.
ononthebackof themagnetoand
eenginestops.
ockclockwiseuntilit isfullyclosed.
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ntinstallationintheMediumTank
gunandacaliber.30 machinegunona
turret;aflexible-mountcaliber.30ma-
w;acaliber.50machinegunformounting
chring forantiaircraftfire;andacaliber
edinside.
ecaliber.30machinegunin theturret
se(effectedbytraversingtheturret),
greesabovethe horizontalanddepressed
ontal.Elevationoftheseguns iscontrolled
yro-stabilizer,whichautomaticallymain-
onwith referencetothehorizontal
n.Thegunnersitstothe rightofthe75
elevatingandtraversingcontrols,the
firingswitchesforboth turretguns(or
al).Thegunnersightsthroughatelescopic
pe(par.15e).Themountforthe gunner's
thegunbyan armandlink,sothat the
lychangedwithanychangeingun eleva-
maintained(vertically)onthetarget
controllingthegun.Calibratedcontrols
tthe reflectingprismofthetelescopeto
etargetwhenthe guniselevatedtothe
e tothetarget.
dtotheleftof the75mmgun.A per-
atedinthetopof theturret,ina mount
vedtochangetheangleofvision.Apistol
sideofthe turret.
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or-
for-
y"
ound
o
ound
250-
n-
0-
on
nd
y"
und
y"
.
o
moke.
e,M6.
ve
towage
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orthecaliber.50 machinegunison
ing.Thehatchring maybelockedto
vingmountintheturrethatchis pro-
nkcommanderwhenthehatchisclosed.
hinegunis carriedinabracketinthe
abovetheradio.
.
14).
anisms(figs.10and148).
canbetraversedmanuallybymeans
nicallybymeansofahydraulicmechanism
raversingoftheturretmaybe doneat
erdirection,dependingonthe degreeand
pistol-gripcontrol.A disengagingshift
ersingmechanisminoperativeaslongas
formanualtraversing.Thepowertravers-
versinghandwheelaredirectlyinfront
of theturret,withreferencetothe
tedbyatelltalearrow(on topofthe
spointsto thefrontendofthe tank.
ockingclampwhich,whenengaged,pre-
It isimportantthatthislockingclamp
d(withthehandwheelturnedasfaraspos-
rclockwise)beforepowerormanualtra-
empted.
ngthewheeloftheturret locking
lturnno farther,tocompletelydisen-
he turretringgear.
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ACK
er'sStationinRight Bow
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traversingmechanism,alwayscheck
ersesfreelywithoutbinding.Pushdown
handtraversinggripwhileslowlyturn-
oengagethe handtraversinggears.
eesby hand,tomakecertainitdoesnot
echanismmaynowbeengagedand
anismdisengagedbypullinguponthe
ingthe handle.
onthefaceoftheturret master
heswitchstarts themotor,whichdrives
draulicpowertothe traversingmechan-
izer.
rotatedbyturningthepistol-grip
eddirection.Thetraversingspeedis in
to whichthehandleisturnedfromits
efartherthe handleisturned,thefaster
thepowertraversingmechanism
emotorswitchto theoffposition.
g theturretclamphandwheelall
ckwise,rotatingtheturretslightly,if
clampintheturret gear.
.138;148-150).
e75 mmgunwiththetankin motion,
heldataconstantangleof elevation,with
ontal,bymeansof thegyro-stabilizer
ydraulicelevatingcylindertooffsetthe
nk.CAUTION:Donotoperatethe
nkisstandingstill, toavoiddrainonthe
hestabilizeroilgage(fig. 149).The
hereservoirshouldshowat leasttwo-
oilifneeded.
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ggearsout ofmeshbypushingin on
oftheelevatinggearclutchlever(fig.
urledlever totheleftand releasingthe
erwithgyro-stabilizerpowerswitchon.
abilizercontrolbox(fig.150)mounted
negunbracketto leftof75mmgun, to
N:Donotturnon currentorattemptto
tilcontrolboxhasbeenplacedin correct
ertical,thegunwillmoveandmay seri-
rret.
gplug(fig.150)isconnectedtothe
mentknobon therecoilandstabilizer
o.
urntheturret switchtotheonposi-
ertoggle switchtotheleftor onposition.
condsforthe gyrostoreachtopspeed.
owone-halfminuterunningtimefor
tmentknobslowlyto therightasfar
rates,indicatingtoostiffanadjustment,
yuntilmovementstops.Failureofthe
sitionindicatesinsufficientstiffness.If
sthestiffnessrheostatknobis adjusted,
sitedirectionuntilthevibrationis elimi-
maybenecessarytomakeslight changes
knobfromtimeto timeasconditions
siredelevationbyturningtheelevat-
coiladjustmentknobonthecontrol
rfiringthefirst round,changethe
eknobto theright,orclockwise.Ifthe
to theleft.Checktherecoilsettingafter
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andadjustuntilthecorrectsettingis
hestabilizer,certaincautionsareto
anddownrapidlybyhand,toavoid
aroundthe pistonrod.
evation,avoidturningthehandwheel
ts limitofelevationordepression.Con-
wheelwillcausethe motortolabor,and
tight,andmovingpartsproperly
whenturningonthestabilizer.There
.Changeinoillevelwhenstabilizer is
ceofairin thesystem.(Forremedy,see
speedof thetankwillcausethegun
g,it isessentialthatthespeedof the
s possible,withtheenginerunningatfull
etankat reducedspeed,shifttoalower
nespeed,ratherthan runonpartthrottle
heauxiliarygeneratorshould always
stabilizerorthepowertraversingmechan-
ingstill,thegunshouldbe controlled
abilizerexceptwhenthe tankisinmo-
.30machinegun.
.Thetwo turretgunsarefiredelec-
ng buttons(foot-operatedswitches)to
efootswitchesoperateonlywhenthe
switchboxistothe leftoronposition.
whenthefiringswitchison. Theright
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, theleftswitchthecaliber.30machine
befiredmechanicallybyapedalmounted
hes.
ndoperationofthe75 mmgunare
07. Certainprecautionsshouldbenoted:
escopeisperfectlycalibratedwiththe
themachinegunby firingonatarget
sedandLocked
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keanynecessaryadjustmentatthe rear
gunwiththegyro-stabilizerinopera-
ndrecoiladjustmentsareproperlyset.
t5atthe start,andadjustedasnecessary
shots.
ndHousingDetails
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ervesthestrike ofhiscaliber.30
inegunbymeansofhisperiscope.
hineguncanbe firedthroughthepistol
alsothroughtheperiscopeoftheloaderor
caliber.45guncanbeused alsotosupple-
r antiaircraftfire.
egunis firedfromaspecialmount
chring (fig.145),whichpermitsanall-
tverticlefireforantiaircraftuse.
picsight(figs.13and14).
e,orperiscope,isprovidedfor each
n(seefig. 4).Eachperiscope,exceptthat
withTelescope,for75MMGunner
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mountedinarevolvingplatewhichpermits
the mountcanbetiltedtoraise orlower
wsareprovidedto holdthemountsta-
periscopeisheldin placeinitsmountby
.Asafetylockontheperiscopehousing
mfallingoutif thenutbecomesloosened.
e,pushitupwardintoplaceuntilthe
mount.(Iftheperiscopedoesnotenter
ertheheadguardbolts havebeentight-
theyprotrudeinsidetheperiscopemount.)
he backoftheperiscopeandmovethe
emovetheperiscope,unlatchthesafety
ut,andpull theperiscopedownbythe
copesarereplaceable.Theyarepur-
ragilematerialsothat,in caseofahit,
nbecomewedgedinthe mount.Care
dlingperiscopestopreventcrackingor
mgunner'speriscopeislinkedto the
ndsynchronizingrodlinkage(seefig.149)
esinaccordwithanychangeintheeleva-
copeincludesatelescopewhichcanbe
deflection,toprovideforits calibration
dby boresighting)andtopermitthe
andthe observationofitsstrike.
pistolportis intheleftside ofthe
eat.It isequippedwithaheavycover,
nor closedposition.Toopenthepistol
o releasethelatch,thenpushdownand
swingtheportcoverup andout.When
will go,turntheleverhandleto engage
ketattheleftside oftheport.
Whenthe turrethatchisopen,a safety
eofeachhatchcover,keepsthecover
.Toclose,pull outthecheckreleasering
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ehalfcoverequippedwiththe locking
Whenboth coversareclosed,theyshould
tchhandleto engagethelatchwiththe
thehatchcoverringfromrevolving,turn
eredge oftheturrethatchring isin
ring, thenpushthelockingbarup into
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on18
20
fficiency,tanksmustbesystematically
alsinorderthat possibledefectsmaybe
beforetheycauseseriousdamage.
TION.
membersofthecrewbe utilizedinthe
erthedirectionof thetankcommander.
heentiretankas wellastheengine,as
OPERATION.
vershouldbe alerttodetectabnormal
Heshouldbetrained todetectunusual
achengineshouldbe listenedtoindividual-
t isdetected.Thedrivershouldglance
ntpanelgagestosee whethertheengine
unsteadyoilgagepointermayindicate
leakin thesuctionsideoftheoil pressure
espeedisfairlyconstant.Thedriver
hefreetraveloftheclutchpedal (par.90).
eversmustbe checkedtomakesurethat
circumstancesshouldavehiclebeop-
troublehavebeenobserved.Whenin
tionappliestotheentire vehicle,and
.
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ALT.
orshouldmakeacarefulinspectionof
sgeneralmechanicalcondition.Minor
peration,anddefectsdiscoveredatthe
eforeresumingthemarch.Ifthe defects
gthehalt,reportto theproperauthority.
eis asfollows:
nashorttimeat idlingspeed.Listen
peedupthe engineseveraltimes,again
oilpressuresandenginetemperatures.
or oilleaks,insideandoutsidethe
stmentandforworn,loose,broken,
dirtfromrollers andfrombetweenbogie
formissing,worn,orlooseparts.
noiltemperaturegage.
djustment.
eparts,connections,andleaks.
s.(Donot useanoilyor dirtyrag.)
PERATION.
soperation,thecommandershouldre-
tothat madeathalts,butmorethorough
onshouldbefollowedbypreventivemain-
tbecorrected,theyshouldbereported
charge.Oilchecksshouldbemadeonlevel
sbeenallowedto standuntiltheoil has
kselectorvalveshouldbeclosedwhen-
e tobemade.
astingsorother metalpartsmayofte
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pletionofarun bythepresenceofoiland
lbecoveredin theinspection:
bogies.
cketsforwornor brokenteethand
tsforunserviceableunits.
ddifferentialoillevel.
aners.
ageofexhaustmufflersandaccessories.
siondevicesforbreakage.
ntsfor defectiveperformance.
operlyinstalled onguns,sighting
es.
ndfightingcompartmentsforcleanli-
ment.
ter,andammunition.
tioninhotweather,batterywatermust
eaweek.
rrettraverse.
xiliarygenerator.
on commander'sreport.
N.
pectionsareprescribed:
lesofoperation(whicheveroccurs
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ksParagraph
orlooseparts,
26; 64
ndclean
kandadjust90
ationandback-
rainand refill25b
ons
.60b(1)
sandvalvesfor
ubricateattwogreasefit-
ersinggear
se
ksparkplug136a
0milesofoperation(whicheveroccurs
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ksParagraph
n21a
Cleanout;correctcauseof
ctfordirtycondition,
36
spect119b
ingandlu-
kandadjust90
lubricate97,98
atorsandfan
orleaksat
leanifnecessary..75 d
k,andreplacefilterele-
heck,andadjustifneces-
49
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nes25
6
cationGuide(figs.16and17) for
sthepointstobe lubricated,theperiods
cantstobe used.Besidestheitemslisted
suchas doorandshieldhinges,pistol
es,mustbekeptlubricated.(Oilholes
paintedredfor easyidentification.)
romthe oilsupplytankbythe pres-
dispumpedthroughtheengine oilcooler
donthe outersideofeachengine.The
hroughthe enginelubricatingoilcircuit,
mps(frontandrear)in theengineoil
avengerpumpsreturnit tothesupply
passvalveintheoil cooleradapterby-
pumpto theenginelubricatingsystem,
heoil coolerinletbecomesapproximately
epressure attheoilcooleroutlet.
housedintheoilpump,and anoil
attachedtotherear ofthecylinder
ange.
(seepar. 60)foreachengineare
(fig. 30)ontheenginecompartment
filteris bledoffoneofthe oilpassages
dthroughthefilter element,andreturned
an.
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oprearofeachengine leadsfromthe
ylinderhead.Abreatheroutletat the
theair cleanerinlets.
OOLER.
r(par.104f) ismountedinthe crew
enteroftheenginebulkhead(seefig. 74).
irculatesthroughthecoolerandbackto
wotubes,whicharelocatedtothe right
ng,onthe hullfloor.
NKSANDLINES(figs.18and19).
telubricatingoil tankisprovidedfor
lledthroughits ownfillerholeonthe top
ret.Oillevelisshownby thecombination
e(par. 122e(10))on theinstrument
nes.
goiltankdrainplug coverplate,below
boxor open-endwrench).
s(squarei/2-inchAllenwrench).
eoilpan drainplugcoverplatesbe-
hopen-endwrench).
pandrain plugs,oneinthefront and
engine.
nes(fig.19). Engineoverheatingand
ubrication(asoutlinedinpar. 45,Trou-
etheneedforremovaland cleaningof
s,andpossiblereplacementoffaulty
emoveoil lines:
systems(par.25b).
utlethoses tolubricatingoilfilters,
filters(fig.30)and atthejunctionplates
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seefig. 19)betweeneachlubricating
eatherconnector.
goilinletand outlettubes,frombe-
pectionplatesremoved(seepar.71 b
onnectionsfromthelowerrear outer
nd disconnecttubesfromlubricatingoil
ttingsthathavebeenremoved,and
ngtheremovalprocedure.
UCTIONS.
oninstructionsforMediumTank
informationandguidanceofall con-
previousinstructions.
mustbelubricatedinaccordancewith
tainedinTechnicalManualsand/orOrd-
ns.ReferenceismadetotheGeneral
6-10)foradditionallubricationinforma-
de section(OFSB6-2)forlatest
16and17).Lubricationinstructions
dbytheusingarm areshowninLubrica-
pecifiesthetypesof lubricantsrequired
heyare tobeapplied.Thedetailedlubri-
owcontainthesameinformationasthe
dataarereproducedare10 x15inchlam-
partof theaccessoryequipmentofeach
ntainedinthelubricationguidesare taken
ndarebindingonusingtroops.
bersintheLubricationGuide(figs.16
ingnotesgivingadditionallubrication
nindividualunitsandparts.(Cold weath-
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d
Point!
ted
owi.
ERloe.t.donnameplatein.idefightingeompartmnt.
it
achl
OE
gCG
1
/i,'[
oss
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ERlocatedonnameplateinsidefightingcompartment.
ensionSs
of Tank
s
CGSuspensionsystemidler
rackCG%
efill
%
%
%
rpose
ide,MediumTankM4A2
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iceattemperaturesbelowzeroF (-18
IDENOTE
er(M4A2Only)3b
s4
,andfinaldrives7a,b
7c
nt 10
"."11
nly)12
2Only)13
enengineis removedfor
gs15b
tionservice16
DLUBRICANTSTOBEUSED
perature
tem
eunit)
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yinglubricant.Lubricateuniversal
ndtracksupportrollers,and tachometer
rs,untillubricantoverflowsatreliefvalve;
newlubricantis forcedfromthebear-
ified.CAUTION:Lubricatesuspension
edarefornormalservice.Forextreme
water,sand,mud,snow,dust,etc.,reduce
e-half,ormoreif conditionswarrant.
61).The powerunithassixoil bath
blowerinlethousing.Threetypes of
t type(AC)'cleanerhasasingleoval
(AC)cleanerhashorizontalslots.The
anerhasverticalovalslots.All sixair
runitmust beofthesametype.Always
eservicingotherpartsoftank,to permit
n dry.Thefrequencyofservicingair
ustandsand conditionsencountered.
ndconditions,serviceaircleanersevery
matureenginewear.Allsix cleanersmust
me.
voirevery25hoursoroftener,as re-
ions.
moutsideofaircleaners.
enwingbolt andremoveaircleaner
housingports.(Donotstuffloose rags
ofaircleanerwith elementandpour
imentandwipecleanwithragsoakedin
oncleaner,removesnapringand baffle
ninstallbaffle andsnapring.)
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eals,andgasketsforwear,and replace
onofairfilter elementforcloggingand
voirwithusedcrankcaseoilorOIL,
(CAUTION:Donotoverfilloil reservoir.)
ening)1 qt.
zontalslots)31/-!qt.
valslots)2J/2Qt-
emovecoverfromintakehousing,and
refulnotto spilloilinto housing.Tighten
ssecurely.
ementevery100 to500miles,or
wsaccumulationofdust,dirt,or foreign
mbled,brushoffor blowoffdirtand
lterelementor uppersectioninclean
pper section,andblowoffordrain
emblingthecleaner,fillingthereservoir,
elementis notdried,fueloil drawninto
ousdetonation.
ter.Cleantheair filtermonthly,as
ingairfilter(seefig.144) tocar-
washpartsin SOLVENT,drycleaning.
ssemblefilter.
erscreenin OIL,engine,SAE30.
uretor.
s(fig.18).Eachenginehas itsin-
kmountedonthefloor intheforward
artment.
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nk daily.
urntank gageselectorswitch(see
to eitherlubricatingoiltankposition.
engine,grade specifiedinTableof
dsfull.Donotoverfill.
thertank.
ubricatingsystemevery250milesor
Tank
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erplatesunderhull floorandremove
atingoiltank andtwodrainplugsfrom
GOILFILTERSFILLERTUBE
LHOUSING
LinesandTanks
dinstallafterunitshave draineddry.
.
iltankwith 32quartsofOIL,engine,
Capacities.
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ckoillevelin bothtanks.Addoilif
to fullmark.
ubricatingoilfilters(see fig.27)for
onfilterpanel.
tat eachoilchange(every250miles
terdrainplug,and filterelement.
withragsoakedinDieselfuel oil,
nplug.
t.
new covergasket.
orleaks.
oilifnecessary.
achenginehas alubricationoilstrainer
e engineoilcooler.
goilstraineron eachengineevery250
perationcanbestbeperformedwhile
isemptyduringoilchange.)
tionplateinfloorof enginecompart-
moil strainerhousingandloosen
r.
ethoseelbowfromengine oilpanby
rboltwithgasket,strainer,housing,
andoutersurfacesofelementby
oil.Donotscrape,oruse wirebrush.
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minsideof housingandfaceofoil
nwithragsoakedinDiesel fueloil.
nggasket,andreplaceifnecessary.
centerbolt.Insertcenter boltpart
fullyslideelementintohousing.
ngheld inplace,firmlyseattheele-
eradapter.Centerthehousingandtighten
tighten.
ingnewgasket.Makesure flatside
onplate.
differential,finaldrives,andengine
al,andfinaldrives,withone-piece
und,removetransmissionfillercap
ndicatorrod.
withcaprestingonfiller neck.(Do
illevel.Add OIL,engine,gradespeci-
fnecessary,tobring leveluptofull
ontight.
50 milesandevery3,000miles
atelyaftertankhasbeenoperated.)
drainholecoverunderhullfloor.
drainpluganddrainplug fromeach
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nplugsand installafterunitshave
illerneckstrainer.
nerinDieselfuel oilandre-install.
apacitywithOIL,engine,SAE10,
to fiveminutes.
dinstallplugsanddrain holecovers.
erentialandfinaldriveswith OIL,
TableofCapacities.
nfillerneckwith quantityspecified
.
utesandrecheckoillevelin trans-
bring leveluptofull mark.
al,andfinaldrives,withthree-piece
aldrivesinseparatehousings.
seea (1),preceding).
50 milesandevery3000milesthere-
ftertankhasbeenoperated.)
drainholecoverunderhullfloor.
drainpluganddifferentialhousing
meachfinaldrivehousing.
drainplugsandinstallafterunits have
e a(3),preceding).
erential,andfinaldrivehousing,with
edinTableofCapacities.
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ferentialthroughtransmissionfiller
edinTableofCapacities.
meachfinaldrive housing,filltowithin
plugs.
utesandrecheckoillevelin trans-
bringlevelupto fullmark.
e.
milesor 50hours.
fig.21) andaddOIL,engine,SAE30,
xmonths,oratclutchoverhaul.
nerunderdrainplugs,bothsides, and
dry,installdrainplugs.
ll withOIL,engine,SAE30,toover-
meofdisassemblyofclutchfor in-
roverhaul,cleanandrepackclutchpilot
androllerbearing.
clutchpilot bearingpullertoolJ-1914
of toolthroughbearing.Expandfingers
gcenterstud.
against flywheel.Turndownnut
romturning,to pullbearing.
lyincleanfuel oilandblowdry.In-
norroughspots onballsorraces.Replace
bt.
withGREASE,ballandroller bearing.
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ftapproximatelyhalffullofGREASE,
o boreofflywheelbyhand.
ngdriver,J-1910,or othersuitable
outerraceofthebearing,anddrive bear-
aceofflywheel.
tersat extremeendsoffilterpanel
tersonside ofengineatflywheelend).
daryfuelfilters(see fig.27)daily.
ersfor oneengineonly.
ddry,close draincocks.
untilevenfuelflowhas beenrestored.
toperations(1), (2)and(3)for
elementevery1000miles or100hours.
valve(fig. 83)tooffposition.
t topoffilterand removebowland
nDieselfuel. Donotscrape,oruse
withcleanDieselfuel.
welementgasketandbowlgasket.
to onposition,startengine,and
hrough(6)for otherprimaryfuel
filterelementevery5000milesor500
to offposition.
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of bowl.Dropbowl.
ndcleaninside ofbowl.
tand reassemble,usingnewgaskets
attopandbottonTof filterelement.
nection,turnfueltankselectorvalve
ch,andrun otherenginetofillfilter bowl
oseconnection.
artengine,andcheckforleaks.
othly,replacefilterelementonother
nt (figs.97and98).Every1000
haftuniversaljointsandslip joint.
thousingfrontcover.
yGREASE,generalpurpose,seasonal
ing(see fig.97)untilit overflowsthe
tslipjointplug (seefig.97)and
ting.
lpurpose,seasonalgrade,untilit
ingandinstallplug.
ousingcover.
rearpropellershafthousingcovercan
tplatformhatchdoor.
ovebolts,andremovecover.
lpurpose,seasonalgrade,topropeller
eefig. 97)untilgreaseoverflowsrelief
cationofclutchselectorlevershaft,
edatthis time.
ousingrear cover.
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(seefig.92).Every1000 miles,lubri-
shaft.(Thisoperationcanbestbeper-
e rearpropellershaftuniversaljointis
tchdoor.
tting throughholeinleftside of
rearof batterybox.
yGREASE,generalpurpose,seasonal
138).The hydraulicoiltankforthe
nismismountedatthesideof theturret
acityoffour quarts.
0miles.
ttwo-thirdsfull,asindicatedonglass
ofoilreservoir.
vis47,untiltwo-thirdsfull,and
m.
vel.
appingswitchon andoffuntilsystem
wlyturnoperatinghandle firstin
er.
singmechanismuntilmovementis
thesystem.
ecessary,tomaintainlevel.
43and144).Thetwo-cycleair-cooled
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vestheauxiliarygenerator,mountedon
erear,islubricatedbyOIL,engine,
eron outsideoftankupperdeckat
removefillercap.
IL,engine,SAE 30,witheach
ouringmixtureintofuel tank,which
e.
seefig.144)and strainer.
strainer.
trainer andbowl,thenopenfuel
mfollowerfeltevery200hours.
magnetoshield.
eortwodropsof OIL,engine,seasonal
wick.Donot over-lubricate.
iles,lubricatedoorand shieldhinges,
tolport covers,escapehatchleverand
ushings,controlrodpins,clevises,clutch
ntrolshaftbearingsgearshiftleverlinks
nd controls;steeringbrakelevers,
ports,controllevers,andpins;machine
eriscopeholderpivots,races,andcover
partsnotspecificallycoveredinthe
L,engine,SAE30.
enengineis removedforinspectionor
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flywheelhousingandfill hinged-cap
30.Replaceplug.
fstarter motorhousingatoilercap
mmutatororbrushes.
ngs.
earingsandcleaninDiesel fuel.
EASE,generalpurpose,No.1,and
packgreasechannelsfullbefore
pipeplug,whichwillforceadditional
tionservice.Waterpumps,clutch
bogiewheelsuspensionlinkageandslides
naldrivesprockethubbearings,hy-
ndturretelectricalmotorbearings.
RDS.
structionsarecloselyfollowed,proper
tisfactoryresultsarenotobtained,a
ordnanceofficerresponsibleforthemain-
cordoflubricationservicingwillbe
themateriel.
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30
ofeachmotorvehicleissuedbythe
ustbekeptintheOrdnanceMotorBook
erallycalledLogBook,whichisissuedwith,
any,thevehicle.TheMotorBook,keptup
ecordthatprovidesvaluableinformation
ancecosts,replacements,etc.,andorganiza-
quirethatentriesbemadecorrectlyand
istobe keptinacanvascovertoprevent
d.
ns.Beforeavehicleentersthecombat
ebearingarecordof assignmentmustbe
stedreferencestotheidentity oftheorgan-
removed.
hechiefsourcesofwearto amotorvehicle.
reallowedto accumulate,particleswill
rfaces,causingabnormalwearand,if the
emedied,resultinginseriousdamage.
are toberemovedinmakingrepairs or
everworkingjointsorbearingsurfacesareto
painstakingcaremustbeusedto protect
ddirtthatmight finditswaytothe exposed
oved.Toolsmustbeclean.The possibility
theopeningwith thesleeveorotherpart
minated.
dgrit, hardenedgrit,orroadoil,use
ppliedwithcloths(notwaste)orbrushes.
powerplantsand electricalinstallations,
ferewiththeiroperation.Cloggedoilholes
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e(neverwith wood,whichmightbreakor
clogthepassages).
cleaningisincludedin TM9-850.
URETOGAS.
xposedtogasrequirespecialcleaningand
ent,describedinSectionIX,Decontamination.
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FORUSINGARMS
epartslists31
32
NDSPAREPARTSLISTS.
carriesaset ofpioneertools,mostof
utsideof thehullbybracketsandstraps;
rtools,carriedinsidethetank;andspecial
sidethetank,forgasdecontaminationand
ghtingandfire controlequipmentforuse
aliberguns.
from dataavailableattimeofpublica-
n VehicleMaterielListissuedbyOfficeof
andfurnishedwitheachvehicle.Listsof
andequipment,withnumberper tank,are
arriedoutsidethetank.Quantity
aruse1
,5Ib.)1
8076orD48067isused)....26
uthandle)1
45ft 1
bleface,10-lb1
1
kset.Quantity
bayonettype1
hydraulictype,fitting1
^in.sq.drive,5in. long...1
e,10in.long 1
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et(continued)Quantity
g........................1
(pressure).................1
peen,2Ib.................1
drive,12 in.long(with
uty,15in.(buttonheadfit-
oint,8in.................1
..........................1
n.sq.drive,9in ...........1
s5in.blade ..............1
urpose,1%in.blade.......1
urpose,\yzin.blade.......1
ve,*/s in.sq............1
rive,% in.hex...........1
ive,yz in.hex...........1
ve,% in.hex...........1
ve,% in.hex...........1
ive,% in.hex...........1
ive,y8 in.hex...........2
ive,% in.hex..........2
ve,1 in.hex............1
ive,\.VK in.hex..........1
ve,iy8 in.hex..........1
ve,iy2 in.hex..........1
17in. long...............1
x3J O.D.,15yardslong____ 1
0 ft.roll.................1
drive,11in. long.........1
.drive,17in. long.........1
.drive ................1
gleend,8in.long...........1
gleend,12in.long..........1
blehead,alloysteel,
1
blehead,alloysteel,
blehead,alloysteel,
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FORUSINGARMS
et(continued)Quantity
blehead,alloysteel,
blehead,alloysteel,
blehead,alloysteel,
(fortransmissionandoil
(differentialfilleranddrain
%in.hex1
sin.hex1
%in.hex1
%in.hex1
%in.hex,.1
%in.hex1
%in.hex1
airtoolscarriedintank.Quantity
.30machinegun.
nts)1
on,Ml2
6;2
rrelbearingplug1
.50machinegun.
1
mm.gun. Quantity
oint,4 in.long1
point,6in. long1
moving1
1
lpeen,20oz1
nt,4 in.long1
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mm gun.(continued)Quantity
0in. long1
351)1
nts)1
pinretainer,1
ng1
ehandle,12in.long1
blehead,\Yin.x1^in.(for
t)1
tainer1
ories.Quantity
er,forspareuse1
ating,\y2qt.,Mil2
M19365
0212)1
w/spout,8qt 1
eandstabilizer,"inblack
pandcoverM19105
!
QMCStandardA-353)...2
,C02(fixed)2
C02(portable)2
C-273(red)
1FLAG,MC-275(green)
ModelC5
-chart)1
8,7ys,7%,7%5
orleftfrontonly)1
1
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FORUSINGARMS
es(continued)Quantity
,M.G.M1919A4FM23-50.1
,S.M.G.M1928A1FM23-401
,M.G.M2FM23-651
enadesFM23-301
mm.gun,M3TM9-3071
erator,TM9-7581
canB101420)1
ommandtanksonly1
8,SCR-528,orSCR-538...1
men,cans60
men,cans2
eM19411
ER
s8^in.high,4^f6in.diam.
pment.Quantity
M6,forspareuse15
SOPE,M38)1
SOPE,M38)forspareuse1
use4
n,M3 1
.
1
quadrant,Ml1
er's,complete1
ewels
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din tank.Quantity
urnishblockinaccordancewith
-end12
lepin)2
owshacklepin)2
onnection12
PMENT.
ystem.
andaroundtheengines,afixedtype fire
videdfortheenginecompartment.Thesys-
undcarbondioxidecylinderscompanion-
etsontheleftside ofthetankhullto therear
necteddirectlytodischargenozzlesin the
e enginecompartment.Whenturnedon,
dintothe enginecompartmentinclouds,
ION:Ifpossible,stopenginesincaseof fire.
lindersareoperatedby eitheroutsideor
eoutsidehandles(fig. 26)areunderneath
rret ontheleftsideof thetank,forwardof
ilfiller pipecovers.Theinsidehandlesare
chedtothehull roof,totheleftrear ofthe
ssibleforservicingthroughthehatchinthe
sall thewayoutandlet go.Afteruse,
erswithfullychargedextinguishers.
mustbeexercisedinhandlingcylinders
eunderhighpressure.Donotdrop,strike,
lindersawayfromexcessheat.
ftener,weigheachfire extinguisher
xedtype)weighslessthan9^2pounds,
gedcylinder.
inguishers.
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FORUSINGARMS
nguisherandControls
dsfromcylindervalvebybackingoff
arofcylindervalves,supportingtheheads
matelynormalpositionbywiringthem to
rt.
nnectingtubefromeachextinguishervalve
emovecylinderswithconnectingtube
tvalves.
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vecylinderclamps.
lly.
guishers.
vedfromcylinder,removecover,expos-
screwstomakecertainclampis tightand
amp.Totightensetscrews,usea slender
e)thatwillfollowscrewintohole.
andlebyinsertingpin incontrolhead
lockwiseuntilclutchpinandarroware
pinandseal wire,ifnecessary.
dischargenozzlesand otheropenings,
fforeignmatter.
ngcylinderson bracketandpartlytight-
mlooseenoughtopermitcylinderstobe
ectcontrolheadsandtubing. NOTE:When
utletsfaceinoppositedirections.
connecting)tubetovalveoutlet.
cylindervalves.Makecertainheadsare
dup witharrow)beforeinstallation.Tighten
s.
ers.
ndcarbondioxidefireextinguishersare
onsonbeside thedriver,oneinthe turret
on.
xtinguisherin thelefthand,graspcone
thebaseofthe coneatthehoseconnection,
of dischargeisdeterminedbytheposition
ischargeatbaseofflame,withtheconeas
me.Increasetherateofdischargefromthe
iminishes.Afteruse,replacecylinderwith
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FORUSINGARMS
ftener,weigheachcylinder.If theex-
weighslessthan3^pounds,replaceit with
er.
efireextinguishingsystemrequiresno
insureits properoperation.Asthesystem
st bekeptinoperatingconditionatall times;
ctionshouldbemadetoinsurethatapparatus
safetyoutlet ofvalve.Ifnotintact,cylinder
hargedandmustberechargedimmediately.
willbeperformed:
es.Inspectentiresystemfor anymechan-
nthatshieldednozzlesarefreeof foreign
ys.Weighcylinderstodeterminethe
onotattempttodeterminecontentbymeans
weightandcarbondioxidechargeare stamped
oceedasfollows:
btractfromthisweight theemptyweight
vebody.Emptyweightincludescylinder
esnotincludethe controlhead.Iftheresult-
ylinderislessthannine pounds,cylindermust
edcapacityoftenpounds.
saredisassembledfromcylinders,remove
m.Checkcableclampsetscrewstomake
pull outofclamp.Afterreplacingcover,
tomakecertainthatcabledoes notbind.
dshouldrotate,andthe pinshouldadvance.
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SUALCONDITIONS
NS.
.
equivalentsoftheFahrenheittempera-
,seetableparagraphf(2),following.
tenanceofautomotivevehiclesatlow
torswhichdonotexistatnormaltemperatures,
nancepersonnelmustspendmoretimein
ailuretogivethis extraservicewillresultin
saryandunwarrantedexpense,andfailureto
ebeendividedintotworanges,minus
elowminus30F.Enginesand lubricants
hysicalpropertiesbelowminus30F. In
quipmentforsupplyingheattobatteries,en-
ir willberequired.
derU. S.ArmySpecification2-102B
snecessarytoprocureacommercialfuel
verifythatthepourpoint is10degrees
peratureanticipated;otherwisethefuel
rature.
zero,iffuel doesnotflowfreely,dilute
ry.
rmicecrystals,whichwillinterferewith
utiontopreventwaterfromgettingintothe
ayskeepthefuel tankfull.Thiswill
aterfromthefreeairspaceabovethe fuel.
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SUALCONDITIONS
mperaturesaboveminus10F. iscovered
onInstructions.Thefollowinginstructions
ntthisinformationandapplyonly toinstances
lsbelowminus10F.for longperiods.
epingengineoilsufficientlyfluidfor proper
esbelowminus10F.arelisted below.Pref-
he differentmethodsintheorderlisted,
vailable.
,drain enginelubricatingoilfromtanks
ndstore inawarmplaceuntil vehicleisto
evehiclein aconspicuousplaceinthedriving
sonnelthatcrankcasesareempty.Ifwarm
attheoil beforerefillinglubricationsystem.
heatonlytothe pointwherethebarehand
rning.)
eptoutdoorsandif theoilcannotbe
swithatarpaulin.Aboutthreehours before
lacefire potsunderthetarpaulin.TheVan
typeblowtorchmaybeused.
atingoil.(Oil maybedilutedwithDiesel
wsthequantitiesof diluenttobeadded
bedintheLubricationGuide(seepar.26)for
uantitiesofdiluentwillformmixturesfor
temperaturesindicated.
rstdilutedturntheengine overseveral
and diluentthoroughly.Diluentshouldbe
r mixedwithoilbeforefilling.
percentageoflightdiluentwillincrease
isreason,theoil levelshouldbechecked
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al,andfinaldrives.
e lubricantsprescribedforuseatminus
eneor gasoline,or15percentDieselfuel.
edilutionofthelubricants,heatthegearcases
orchlightlyoverthe entiregearcase;
atinone spot.
cribedforuseat minus10F.willfurnish
temperaturesaslowasminus30F. for
elowminus30F.,greasescomparableto
perature,orGREASE,0.D.No.00,
cannotbeappliedat temperaturesbelow
ildings.In anemergency,whenheated
,useoil,and inspectandlubricatefrequently.
tems.
anentantifreezesolutionsshouldbe used,
pedwitha high-pointthermostatthatbegins
ndis fullyopenat185F. (85C.).Alcohol
lywiththisthermostat,becausealcoholboils
estone),isprescribedforuseasananti-
,ethylene,isnotobtainable,othermate-
wingtable liststhequantityofPrestoneor
obeaddedtopreventfreezingat theindi-
ciation
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SUALCONDITIONS
ntifreezesolutions.
onsshouldbetakenbeforeputtingin the
oroughly.Theradiatorsandcylinder
eparatelyinordernot totransferanyresidue
eaks;tightenthe hoseconnectionsand
tthatwaterand theantifreezesolu-
eforetheyarepouredinto thecoolingsys-
separately,thewatermayfreezebeforethe
solutionbecomesthoroughlymixed.
thermostatsarefunctioningproperly,
Checkthebrushes,commutators,and
mutatorsareclean.Thelargesurgesof
tingthecoldenginesrequire goodcontact
mutators.
nallconnections,especiallybattery
akenthatthereare noshortcircuits.
cyofbatteriesdecreasessharplywith
,andbecomespracticallyzeroatminus40 F.
withthebatterywhenit hasbeenexposed
nus30F.withoutfirst warmingupbattery
enerator.Keepauxiliarygeneratorinopera-
runningsmoothly.Seethatthebatteryis
hydrometerreadingbetween1.275and
terywillnotfreezeattemperatureslikelyto
cticclimates,butafully-dischargedbattery
start,removeanyicefromwiringor
t.
40F.i tisnecessarytopreheatthe ingoing
ginesintheM4A2tank(seepar. 8b,Cold
atestarting.
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easureforDieselengines istodirecta
takemanifold.Heatedairis oneofthe
esel engines.Airheaters(seepar.8b)
ngactioncontinuedfora shortperiodafter
all cylindersarefiring.
0F.to- 30F.
start,seethateverythingisin readiness
rtonthefirst cranking.Haveoneengine
ttemptingtostarttheotherengine.
ginemustbeturned overasrapidlyas
acriticalcrankingspeed;theymustbe turned
oreany firingispossible.ForGeneralMotors
chanicalcondition,thiscriticalspeedmay
utionsperminute.Belowthisspeedtoomuch
ylinderwallsandengineswillnotfire.
started,run at800-1000revolutionsper
medupto 160-180F.
30F.
paulin,tent,orportableshed. Placeoil
hecoveringaboutthreehourspriorto time
elteredareasshieldedfromwind.Cold
ficulties.
ollectin thefuellines.Ifthe enginedoes
noughfuel,heatthefuellinesand filters
offire.
estmechanicalcondition.
ervicedprior totheadventofcold
s,ifnecessary,soitwill pourfreely.
inespeedmomentarilybeforemovinghand
on.As theenginecoaststoastop, itwill
roductsofcombustion,includingwater
theengine.
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SUALCONDITIONS
es.
terielis atthediscretionofofficersin
lapsibleshedsareuseful ascovers.
or VanPragblowtorches,ordinaryblow-
beused forheatingvehicles.
itiesfor changingbatteriesquicklyare
emetal standsareusefulforheating
necompartmentdoorcoverscanbe
lptokeeptheenginerunning atnormal
s.
4A2isbuiltand equippedforoperation
emperature,andovervariedterrain.There
recautionswhichtheoperatingcrewand
houldobserve,withrespecttolubricationand
rain,andother componentsofthevehicle.
temperatures.
olingsystemisfunctioningefficiently.
ges.
gSystem.
erplantis adequatetomeetperformance
udes.However,thesameprecautionsasfor
tionshouldbeobserved.
andoperationunderotherextremely
ynecessitatecleaningtheaircleanersas
hours(par.64).
k(withrubber tracks)inmountainous
andsnow,wheresufficienttractionisnot
rsareprovided,whichshouldbeinstalledas
5.NOTE:Grousersarenotnecessarywith
ldbeperiodicallycleanedofmud,snow,
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nation34
CONTAMINATION.
nstantdangerofgasattack,unpainted
ttouchtheopticalpartsof instruments
mstobe protectedbyoilfromchemical
butammunitionisexcluded.Carewillbe
ttouchtheopticalpartsof instruments
s.Materielnot inusewillbe protected
ble.Ammunitionwillbekeptinsealed
racticallynoprotectionagainstmus-
rand oilcloth,forexample,willbepene-
The longerarticlesofclothingareex-
gerin wearingthem.Rubberbootsworn
ithmustardgasmayoffera gravedanger
evenseveraldayslater.Impermeablecloth-
or anhour,butshouldnotbe worn
teriel.
tsof materielthathavebeenexposed
andlewisitemust becleanedassoonas
rycleaning,orALCOHOL,denatured,
ould thenbecoatedwithengineoil.The
atetheexteriorsurfaces,thebore,the
dallporous attachmentssuchasstraps,
ecesexposedtogas.
beenexposedtogasmustbe thor-
anbeused.To cleanammunitionuse
noncorrosive;ifthisagentisnot obtain-
oolwater.Aftercleaning,wipeall ammu-
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CAUTION:drypoweredAGENT,decon-
e),usedfordecontaminatingcertain
ustnotbe usedonornear ammunition
sflamingwhenitis broughtintocontact
theremovalofliquidchemicals(mus-
ateriel,thefollowingstepsshouldbe
acompletesuitofimpermeablecloth-
kwillbeworn.Immediatelyafterremoval
hwithsoapandwater(preferablyhot)
omesin contactwithanyskinareas,if
stardgets intotheeye,orif thevaporof
perativethatcompletefirst-aidtreatment
hirty minutesafterexposure.(First-aid
M-91850andFM-21-40.)
stardwillbe decontaminated.Ifim-
eenexposedtovaporonly,itmay bede-
intheopenair,preferablyin sunlight,for
e cleanedbysteamingfortwohours.If
hasbeencontaminatedwithliquidmus-
ht hourswillberequired.Varioussteam-
sedfrommaterialsavailableinthe field.
aterielofdirtthroughthe useofsticks,
urnedorburied immediatelyafterthis
uldberemovedfrommaterielbefore
,bymeansofSOLVENT,drycleaning,or
roil,appliedwithrags attachedtosticks.
tedsurfacesofthematerielwithbleach-
gonepart AGENT,decontaminating
partwater.This solutionshouldbe
.Washoffthoroughlywithwater,then
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and instrumentsexposedtomustard
aminatedwithAGENT,decontaminating,
partsolidto15parts solvent(ACETY-
thismixtureis notobtainable,use
achingsolutionmustnotbeused,because
rumentlensesmaybecleanedonlywith
asmallquantityofALCOHOL,ethyl.
tlywithengineoil.
contaminating(chlorideoflime),is
ybetemporarilycleanedwithlargevol-
er,mustardlyinginjoints orinleather
movedbythis procedure,andwillremain
eruntilthe materielcanbeproperlyde-
dwashedfrommaterielinthismanner
nd,necessitatingthatthecontaminated
hwarningsignsbeforeabandonment.
minatingofmaterielcontaminatedwith
ompoundsintothesoil,poisoningany
tyfor bothmenandanimals.
ngthathasbeen contaminatedshould
thbleachingsolution.Intheeventthat
nt,itmaybe necessarytoburnorbury
econtaminationiscontainedinFM
8,1941,Decontamination.
automotivemateriel.
ensubjectedtogasattackwiththe
anersshouldbe servicedbyremovingthe
ndelementswithSOLVENT,dryclean-
propergradeofoil.
ldbecleanedin thesamemanneras
shionswillbediscarded.
mentsthoroughlywithbleachingsolu-
edonein thefield.Operatorsshouldcon-
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enrunningunderconditionsofhightem-
zationofthemustardorl ewisite.
icleswillbedecontaminatedwith
ntingmaybenecessaryafterthisoper-
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REL
henthe lossofatankto theenemy
rippledtankmust beabandonedduring
nkis disabledonthebattlefieldandits
ankwillbe destroyedbyitscrew.
tancespermit,machinegunsandtri-
,andtheantiaircraftgun,togetherwith
rtheseguns,shouldbe removedfromthe
distancebeforedemolitionofthetank.
teriel.Thetankcrew,besidesbeing
onofitsowntank,may becalleduponto
thervehiclesandmaterieleitherthat
s,orabandonedorcapturedenemymate-
ed.Ingeneral,enemymaterielshould
wnequipment.
arlyvehiclesthatarebeingsetafire,
royedona bridge,inadefile,or atleast
heenemy,unlesssuch actionwouldalso
riendlytroops.
vehicles.
ntitankweapons.
randrocket,or
enadelauncherandrifle,or
nkgun.
andonedvehicle.
nintothevehicle,aimingat thefuel
oad.Ifagoodfire isstarted,thevehicle
yed.Ifnot,theengine,suspension,and
agedbyantitankfire,inthe ordernamed.
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REL
LightTanks)using TNT.
fTNT.(CAUTION:Donotusenitro-
vethanTNT.)
twominutes'length).
.
ehicle.
eldedorboltedin placeinsidetheen-
tthebulkheadandnearthegastank.
oconnecttheenginecompartmentwith
,soastopermitinsertionof thecapand
sholeshouldbeas smallaspossible,and
earemovableplug.Thismodification
cepersonnelunderthesupervisionof an
ksofTNTin theimprovisedbracket
t.Carrythefuzeandcrimpedcapin the
destroytank,insertcapandfuzeinthe
last willsetthevehicleonfire and
redvehicles.
eforeachrubbertiredesirable,but
able,butnotmandatory.)
nadeundereachtire.
neaccessorieswithaxeor sledge.
plug.
eincendiarygrenades.Theensuing
ndmostofthevehicle.
rgencies,action(a)and(b)will
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eaponsof75mm caliberorlarger.
pter(forcalibersof155mm orlarger)
eapproximatelycenteredinthetube.
eacha slittrenchorotherprotection.
rtire).
.PlacethearmedM9A1grenade
ottouching)thenoseof theshellwhen
nademustpoint towardthebreech.In-
Takecover.Fire.(Thiswilldestroy
echanism,anddosomedamagetothe
ncendiarygrenadeagainsteachtireand
asbeenexperiencedinunfuzingthe
onshouldbe performedinadvance.)
N-M14per guntube,plusoneper tire.
PlacefiveAN-M14grenadesinthe
roundwheninserted.Ignite.(Thether-
.Iftheenemyattemptstofire thisgun
e,thegunwill bedestroyed.)Placean
eachtireandignite.
on.
rrubbertire.
rolequipmentandsmallparts.Fire
nintorecoilsystemandother critical
gainstricochets.Setfiretoeachtireby
enades.
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REL
ndaircraftcannonlessthan 75mm
rrubbertire.
thmudandstonesfor alengthofat
roundHEshell.Firefromslit trenchor
adeagainsteachrubbertireandignite.
paragraphf(3).
gmuzzlewithmudand rock.Take
ershelter.Fire.
shagainstrocks,trees,etc.
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NSTRUCTIONS
ANCE
ndLCengineparts".37
ceandrepairsbythe crewandotherunits
minedbytheeasewithwhichtheprojectcan
chtimeisavailable,thenatureofthe terrain,
onditions,concealment,shelter,proximityto
available,andtheskill ofthepersonnel.As
xactsystemof procedurecanbeprescribed
sareincludedinorder thattheoperation
erpretedbythosedoingthework.
aning,lubricating,tighteningboltsand
adjustmentsofsubassembliesorassemblies
kingrepairsto,or replacementof,apart,
y,thatcanbeaccomplishedwithoutcompletely
emblyorassembly,anddoesnotrequireheavy
ning,fitting,and/oralining.
movingthepart,subassembly,orassem-
eplacingit withaneworreconditionedor
orassembly.
mpletelyreconditioningandplacingin
unserviceablepart,subassembly,orassembly,
dingwelding,riveting,machining,fitting,
esting).
rsonnelisauthorizedto removeand
wertrainunitassembly;however,thereplace-
therengine,or thereplacementofapower
smissionassembly,mustnotbe doneby
rizationis receivedfromordnancepersonnel.
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ANCE
intenancedutieswhichmaybeper-
ersonnel.All otherreplacementsandrepairs
dnancemaintenancepersonnel.
,SERIES71,MODEL6046
sket46b
Replace46candd
Replace47
48c
handi
e72b
60b(1) (b)
(b)
61c
c
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andAir Heater
e
9handi
ssembly50b
ng
56c
eplace63b
ve66c
e65b
vice75 c
eplaceelement75d
76c
e78
b
eplace70b
82c
eplace83c
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ANCE
h
a
02bandc
c
05and106
9
cande
bearings.112d
2eandf
aseseals.114e
52b
ace54c
7f
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ce119b
e119b
faceplate122bandc
Service(M4A2only)132
place133j (3)
M4A2Only)
y)
140
Controls(M4A2Only)
ervice143
ENLAANDLCENGINEPARTS.
powerplantareidenticalexceptfora
semblies.Caremustbeexercisedininstalling
surethattheyarecorrectfor theenginefor
ssembliesaredifferenton theleft(LA)
and inprocuringreplacementpartsitis
hichenginetheyarerequired:
erBodyassembly,waterpump
vernorcontrol
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ANCE
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e
r
,
t
eel
norcon-
ve
tlet
ction
ction
operat-
throttle
e
t,upper
erjunc-
ary
y,injec-
ndgov-
uregage
to
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SANDEQUIPMENT
).
pairtoolsforthetwinDieselpowerunit are
nanceorganizationsasshownin thefollowing
ETOOLSMECH.
r;also
-
push
d(set
tor
ompression
epilot
ng
head
sure
assem-
ng,twin
ock
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SANDEQUIPMENT
ETOOLSMECH.CO.CREWPLAT
ntiming..XX X
bleflare
top
.X
row-
umpXX X
ationalspecialrepairtoolsforthe main-
M4A2isasfollows:
CH.CO.CREWPLAT
bayonettype..X..X
rtable,25lb.,
w/HOSEand
ngXXX
iner,assem-
r,assembling,
oilretainer,
or,removing...X..X
compartment
etfront
eld (M4A2
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ret(M4A2
,w/SIM-
djust-
onheadtype,
eon,assembling..XXX
eelgudgeon....XXX
gudgeon,
type....X
ete....X
y2sq.extra
udgeonclamp-
ngX
nstalling....X
aldrive,dif-
ugX XX
.hexXX
ansmission
X
driveXX X
sq.drive,
X
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SANDEQUIPMENT
CH.CO.CREWPLAT
et,%in....X
et,%in....X
et,%in....X
et,%in....X
et,%in....X
et,%in...X
et,%in....X
ecial,1in.sq.
onsistingof:
quare ...XXX
long,IK
aleX XX
eX XX
nspection
wheelgud-
acket
ubnut....XX X
X
X
retainer
supportroller
supportroller
ex.,bogie
ing,special....XXX
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OOLSMECH.CO.CREWPLAT
ex.,extra
essorXXX
tespring
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RTSANDACCESSORIES
ndaccessories40
EPARTSANDACCESSORIES.
parepartsissuppliedto theusingarmfor
partsmostlikelyto becomebroken,worn,
e.Thesetiskeptcompletebyrequisitioning
rganizationsparepartsare listedinpertinent
arepartsis coveredinSectionVI,Care
sincludetoolsandequipmentrequiredfor
ssemblingastheusingarmis authorizedto
ngandpreservationofthe armament,sight-
ent,ammunition,etc.Theyalsoinclude
ndotheritemsnecessarytoprotectthe
seor whenitistraveling.Accessoriesshould
otherthanasprescribed,andwhennotin use
s,armament.Aseparatesetofspareparts
mforeachsubcalibergun.Afterthe initial
completebyrequisitioningnewpartsto
ancesareprescribedintheSNL'sforthe
t.Theaccessoriesaretoolsandequipment
rcleaningandpreservingthesubcalibergun
gacompleterecordoftheir use.
cessoriespertank.Theissueper tankof
hearmamentcarriedbyMediumTankM4A2
al..30,BrowningM1919A4.
ank.(Forcompletelistofrepairparts,
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ivot1
s)1
ontents)2
l(w/ocontents)...2
mbly1
ushing1
y2
bly2
2
mbly1
/ocontents)1
y1
1
ank.(Forcompletelistofrepair part