tm 9-733 mine excavator
TRANSCRIPT
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CALMANUAL
Publ
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NICALMANUAL
S74JANUARY1945
TONOFRESTRICTEDMATTER-
dinrestricteddocumentsandtheessentialchar-
materielmaybegivento anypersonknowntobein
atesand topersonsofundoubtedloyaltyand
atinginGovernmentwork,butwillnotbe com-
to thepressexceptbyauthorizedmilitarypublic
soparagraph23b,AR380-5,15 March1944.)
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uary1945
T5E3ispublishedforthe informationand
.
TARYOFWAR:
0);Corps(10);SvC(10);Dept (10);D(2);
chSv(2);Arm& SvBoards
&Sp SvSchools(10);Ord
PE's"MarkforOrdO"(5);
ff(5); OrdRegOff(3);
bs(5).
.
*9-325.
7;9-57;9-67;9-127;
8;9-377.
ols,seeFM21-6.)
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N/^V^>
3-5
sories4-65-7
STRUCTIONS
equipment8-108-9
aryconditions..1213-14
enemyuse13-1414-15
CEINSTRUCTIONS
oolsand
ceservices18-2416-24
824-26
29-5226-44
UIPMENT
5
CTIONS
45
55-5645-46
ve57-5947-52
0-6253-57
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ublishedforthe informationandguidanceof
ininformationonoperationandmaintenanceof
escriptionsof majorunitsandtheirfunctionsin
ntsofthevehicletowhichthis deviceisattached.
cavatorT5E3andare arrangedinfiveparts;
rtTwo,OperatingInstructions;PartThree,Main-
Four,AuxiliaryEquipment;PartFive,Repair
ofthemanualcontainsinstructionsforship-
andalist ofreferencesincludingstandardnomen-
nuals,andotherpublicationsapplicabletothismine
berswhichappearthroughoutthemanualare
LG-228andC-l1 December1944.
E3isusedin conjunctitonwiththeMedium
oesnotcontaininformationontheoperationand
mTankM4A3sincesuchinformationisavailable
cableforusein performingprescribedoper-
a briefexplanationofeach:
RMNO.48,DRIVER'STRIPTICKET
ENANCESERVICERECORD.Thisform,
furnishedtothedriverwhen hisvehicleisdis-
ssions.Thedriverandtheofficialuserof the
tailappropriatepartsofthis form.Theseforms
hiclesinconvoyorontacticalmissions.Thereverse
e driver'sdailyandweeklypreventivemain-
schedule.
.478,MWOANDMAJORUNITAS-
ECORD.Thisform,carriedwiththevehicle,
elcompletingamodificationormajorunit
recordclearlythedescriptionofworkcompleted,
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mileage,andMWOnumberornomenclatureof
performingtheoperationwillinitialinthe column
arts,andaccessoryreplacementwillnotberecorded.
O.462,PREVENTIVEMAINTENANCE
LINSPECTIONWORKSHEETFORFULL-
HEELEDVEHICLES.Thisformwillbe
ile)or 100-hour(1000-mile)servicesandfor
esevehicles.
BRICATIONORDER.AWarDepartment
beslubricationmaintenanceforthisvehicle.A
witheachvehicleandis tobecarriedwithit
O.9-70,SPOT-CHECKINSPECTIONRE-
EHICLES.Thisformmaybeusedby allcom-
affrepresentativesinmakingspot-checkinspec-
O.468,UNSATISFACTORYEQUIPMENT
usedforreportingmanufacturing,design,or
erielwithaviewto improvingandcorrectingsuch
mmendingmodificationsonmateriel.Thisform
ngfailures,isolatedmaterieldefects,ormalfunc-
romfair wearandtearoraccidentaldamage;nor
r,ortheissueof partsandequipment.Itdoesnot
edoperationalorperformancerecords.
O.9-81,EXCHANGEPARTORUNITIDEN-
properlyexecuted,maybeusedwhenex-
emsforlikeserviceableassemblies,parts,vehicles,
A.
xcavatorT5E3consistsofaV-shapedrake-
ndminesaheadof thetankwhilethetankis in
nty-twoteethextendingforwardatanangle
oweredgeofthe blades(fig.2).Ateitherside
withthe mouldboard,foldingwingsareattached
minesfromfallingbackwardunderthetank
orabletorquecharacteristics,themineexcavator
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dontheMediumTankM4A3.Tanksto which
be attachedwillbemodifiedbyremovingthe
oorbehindthe driverandinstallingtwogenerators
nginecompartment(fig.3).Thesidearmsof
achedtothe outsideofthetanksuspensionbrackets
fig.9).Themineexcavatorbladeis raisedand
draulicjack.Thehydraulic jackissupportedon
d tothefrontofthe tankbyasupportassembly
nded168in.
d130in.
ank313in.
wgroundline14 in.
.
n.
-
30 min
th28%in.
h'231/2in.
enters6in.
.
%in.
2%2m-
/2in.
assembly9960Ib
es
refor informationonlyandmustnotbe
tion.
oftheMineExcavatorT5E3,thetools issued
hicleareadequateforthemine excavator'smain-
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ti
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ries
eassembly.6
mbly,pipeupper2
y,jettisoningframe...1
y,jettisoninghand....1
y,jettisoningjack1
l1
highpressure2
331
ebolt 6
in2
ng2
unting2
embly2
andbladeassembly..
hthemineexcavatorwasdesigned,noacces-
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S
mationforguidanceofpersonnelresponsible
ment.Itcontainsinformationonoperationof
onandlocationofthecontrols.
quipment
tionedvehicleisfirstreceivedbytheusing
ryforsecondechelonpersonneltodetermine
eenproperlypreparedforserviceby thesupplying
e,it isinconditionto performanymissionto
henplacedin service.Forthispurposeinspect
blies,andaccessoriestobesuretheyareproperly
,andcorrectlyadjustedand/orlubricated.Check
ainstsectionIII, tobesureeveryitem ispresent,
ndproperlymountedorstowed.
thefirstechelonpersonnel(operator,driver,
erformanceoftheseservices.
CIENCIES.
uringthecourseoftheseserviceswillbe
eswithinthescopeofthemaintenanceechelons
eforethevehicleis placedinservice.
ondthescopeofthemaintenanceechelonsofthe
herechelonfor correction.
eriousnatureto theattentionofthesupplying
erchannels.
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uipment
ES.
,Examinebladetoseethat allmounting
sentandsecure.,andthat wingandtoothpinsare
ackets,PivotBearings,andLatches.Inspect
ewstoseethattheyare secure.Seethatrustand
erialisremovedfrompivotbearingsandlatches.
mbly,andCables.Examinetripodmounting
rumandpulley nutstoseethat theyarepresent
s,cableclamps,cablethimbles,cableshackles,and
y arepresentandsecurelyattached.
SupportBracketAssembly.Besurethat
ntingcapscrewsandmountingpinsarepresentand
ndcprrosionpreventivematerialisremovedfrom
se,andGuard.Examinehydraulicpipe
theyaresecurelysupportedandconnected,and
guard capscrewsaresecure.
andHose.Inspectreservoirmountingcap
theyaresecure.Besurereservoirscreenis clean
theris notclogged.Checkoilsupplyinreservoir
er level.
,DriveBelts,andBeltGuard.Checkpump
apscrewsandnuts toseethattheyare secure.
ts areadjustedproperly(par.47)andbelt
olLevers.Besurethatrust andcorrosion-
ovedfromcontrolvalveandlinkage,andthatall
ure.
Mountings.Examinejettisoningcontrollever
are secure.Besurethatalltape andrust'and
rialisremovedfromjettisoningcablepassage
eckwithparagraph5tobe sureallitems
ion,clean,andproperlystowedormounted.
ehicleOperator'sManual,LubricationOrder,
.478(MWOandMajorUnitAssembly
ainingtothe mineexcavatorarelegibleand
.S.A.registrationnumberandvehiclenomen-
nFormNo.478fornew vehicles.
conditionofthemineexcavatortodesig-
ty.
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hydraulicsystemaremountedwithinthetank
gunits:
ircontainingthesupplyofoilforthe hydraulic
ketsabovethefrontof thetransmissioncase
vestheoilsupplied bythereservoir,and
rethroughpipe linesasrequired.It ismounted
rofthe transmissioncase(fig.5).
ontrolvalvedivertstheflow ofoiltoraise
n anyposition,atthediscretionofthe operator.
erearof thereservoir,returnstheoilto the
ktolower(fig.4).
Themineexcavatorbladeisoperatedthrough
ontrolleversmountedon therearofthe reservoir
rolvalvebyshaftingandlinkage.Onecontrol
htsideofthe operator,neartheoperator'sseat,
OIRPUMPTOCONTROLVALVEHOSEFILLERCAP
TROLVALVE
ontrolValveInstalled
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dPumpInstalled
ofoperation(fig.5).Theother controlleveris
attheleft oftheassistantoperator.Thecontrol
s:
r carrytheblade,placethecontrolleverin
ion.
the blade,pullthecontrolleverbackward.
ertheblade,pushthe controlleverforward.
trolleverwillreturnto theneutralorvertical
controlleverattachedtothejettisoning
achofthe assistantoperator.Bypullingthelever
totripodconnectingpin(fig.6) andthelatches
rings(fig.9)arereleased,at thesametimeallow-
bejettisonedwithoutemergingfrom thetank.
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podConnectingPin
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yConditions
yConditions
emineexcavatorattached,operatethetank
emannerasthetank isoperatedalone;however,
greatlyrestricted(refertoTM9-759).Before
s,theoperatorshouldraiseandlowerthe bladeof
altimestobecomefamiliarwiththe"feel"of the
unningandthe transmissioninlowgear,move
foreloweringtheblade(controlleverin forward
gposition.Lowerthebladegraduallyuntila depth
mineshasbeenreached.Withthetankmoving
raiseor lowerthebladetocompensateforuneven
tankstartstoraise("nose-up"),theoperator
das thefrontofthetank startstolower("nose-
eblade(controlleverin rearposition).Raiseor
stanceandin theoppositedirectioneachtime
esupordown.Theengineshouldbe operatedat
he operatortodrivethroughtheminefield with-
bor orstall.
tisoningthebladewill bemoreeasilyaccom-
ademaybeenteredinthe ground.However,the
plishedwiththetankheadedeitherup-gradeor
onexceptwhileactuallybackingthetank.To
eit inpositionwhereitmaybe quicklyattached
e groundonafairlylevel spot.Drivethetank
econtrolleverforwardin theloweringposition.
ound,theassistantoperatorwillpullthe jettisoning
thepinconnectingthejackpistonto thetripodis
tchesat theendofthe sidearmswillalsobe
tmountingstoopen(fig.9). Theassistantoper-
ngreleaseleverbackwhiletheoperatorbacksthe
upper endofthejackpiston clearsthetripod,
pushthe jettisoningreleaseleverforwardtoallow
engagefromthelever.The operatorwillcontinue
the assistantoperatorwillobservethejettisoning
tbecomeentangledwithanyofthe insideequip-
avesthetankthroughthebowmachinegunport.
ckeda sufficientdistancetoclearthesidearms,
redatwill.CAUTION:Neverrunthe pistonof
ecylinderwhile thebladeisnot attachedtothe
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erableweighttoforcethepistondownin position
ankAfterJettisoning.Drivethetankfor-
tokeepthetankcenteredbetweenthemine
nthepivotsonthetank mountingbracketsare
otherearof themineexcavatorsidearmrear
hehydraulicjack(controlleverin rearposition)
stonisat thesameheightasthe connectingpin
lethe jackpistonisbeingentered,it willbe
toperatoroutsideofthetank toholdtheconnecting
yintheopenpositionbypulling thejettisoning
econnectingpinin thetripodassemblyhas
draulicjackpiston,theassistantoperatorwill
earingsat therearendof eachsidearm(fig.9).
ecure,theend ofthejettisoningcablemustbe
gunopeningofthe tankandtheendof thecable
soningreleaselever.
myUse
excavatorwhensubjecttocaptureor abandon-
ill beundertakenbytheusingarmonly when,
tarycommanderconcerned,suchactionis
ollowareforinformationonly.Thecondi-
tionwillbeeffectedarecommand%decisionsin
etacticalsituation.
to, thevehiclemustbesobadlydamaged
o ausableconditioninthecombatzoneeither
n.Adequatedestructionrequiresthatallparts
ofthe vehiclebedestroyedordamagedbeyond
thesameessentialpartsmustbe destroyedonall
emycannotconstructonecompleteoperatingunit
agedones.
ONS.
tructionscontainamethodofdemolition
mineexcavatorhasbeenjettisonedfromthe
TNTchargetotheextremeendof eachsidearm
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myUse
2-poundTNTchargeinthetripodassembly
onnectingpin(fig.6).Inserttetryl nonelectric
safetyfuzein eachcharge.Ignitefuzesandtake
esarepreparedbeforehandandcarriedinthe
fuzesseparatedfromthechargesuntil theyare
ONS
rmationfortheguidanceofthe personnelof
sponsibleforthemaintenance(firstandsecond
t.Itcontainsinformationfortheperformanceof
andpreventivemaintenanceservices,aswellas
nceofthemajorsystemsandunitsandtheir functions
entsofthe equipment.
ols
ONALTOOLS.
noftheMineExcavatorT5E3,thetoolsissued
readequatefortheMine Excavator'smaintenance.
UCTIONS.
swerenotavailableattimeofpublication.They
mofachangetothis manualassoonastheyare
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Services
N.
val.Preventivemaintenanceservicesaspre-
functionofusingorganizationechelonsofmainte-
nceistheresponsibilityofthe commandersofsuch
cesconsistgenerallyofBefore-operation,During-
operation,andWeeklyservicesperformedbythe
ndthescheduledservicestobeperformedat
ganizationalmaintenancepersonnel.
generalinspectionofeachitem appliesalso
rorconnectionandisgenerallya checktosee
ngoodcondition,correctlyassembled,secure,or
dcondition"isusuallyan externalvisualinspec-
theunitis damagedbeyondsafeorserviceable
dition"isexplainedfurtherbythe following:Not
orburned,not brokenorcracked,notbareor
psed,nottornor cut,notdeteriorated.
toseethatit is"correctlyassembled"isusually
ontoseewhetherit isinits normalassembled
todetermineifitis "secure"isusuallyan
on;awrench,hand-feel,orapry-barcheckfor
tionmustincludeanybrackets,lockwashers,lock
erpinsusedin assembly.
beunderstoodtomeanwornbeyondserviceable
oresultin failureiftheunit isnotreplacedbefore
tion.
RCREWMAINTENANCE(FIRST
hanicalefficiency,itisnecessarythatthismine
allyinspectedatintervalseachdayit isoperatedso
scoveredandcorrectedbeforetheyresultin serious
vicessetforthin thissectionarethosetobe
dcrewBefore-operation,During-operation,At-halt,
linspectionofeachitemalsoappliesto any
nection,andgenerallyincludesachecktodeter-
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Services
condition,correctlyassembled,secure,orexces-
onpertainingtothevehicleonwhichthis mine
ertoTM9-759.
ERVICE.
nscheduleisdesignedprimarilyasa checkto
vatorhasbeendamageddueto tampering,sabotage,
he After-operationServicewasperformed.This
yomittedevenin extremetacticalsituations.
-operationServiceconsistsofinspectingthe
totheproceduredescribed,andcorrectingor
sfoundtothedesignatedindividualinauthority,
AGE.Inspecttheentireunitingeneral,its
ulicjack,controls,pump,reservoir,andlines,for
keitunfitto performanymissiontowhichitis
EETH.Inspecttheb.lade,bladeteeth,and
ingoodcondition,thatall assemblynutsaresecure,
ered.Seethatthe wingsmovefreely,
UNTINGBRACKETS,ANDLATCHES,
kenwelds.Seethatbracketsare mountedsecurely
roperly.
ASSEMBLY,ANDCABLES.Inspecttripod,
cablestoseethattheyare ingoodcondition,
securelymounted,
ACKSUPPORTBRACKETS.Examine
ndbesure jacksupportbracketsaresecurelymounted
SE,ANDGUARDS.Inspecthydraulicpipe
ttheyarein goodcondition,notleaking,securely
Besureguardsaresecureandthat hydraulichose
portbracket,
NES.Examinereservoirandlinestosee
nted,connected,andnotleaking.Besureoilin
perlevel,thatscreeninfiller neckisclean,and
d.
S.Inspectpumptoseethatit isnotleaking
secure.
EVER,DRIVEBELTSANDBELT
trolleverstoseethattheyoperatefreely.See that
sted(par.47), andthatthebelt guardissecurely
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sshouldhaveyg-inchdeflectionundernormal
etweendrivepulleys.
OLLEVERANDMOUNTING.Inspect
seethatit ismountedsecurelyandthatitoperates
ngcableissecurelyattachedtocontrollever.
ERVICE.
neexcavatorisinmotion,beonthe alertfor
ingcharacteristicssuchasdistortionof component
ndicateimproperactionofthehydraulicsystem.
erationServicesconsistofobservingthefollowing
ceduresandinvestigatinganyindicationsofserious
cienciestobecorrectedorreportedatthe earliest
nextscheduledhalt.
heoperationofthe mineexcavator,observe
yextended.
ASSEMBLY.Beonthe alertforanyindica-
tripod mountingpinsorconnections.
ACKSUPPORTS.Whilebladeisbeing
ticularattentiontoall visiblemountingsandcon-
ckforanyindicationofloosenessin jacksupport
DHOSE.Duringoperation,asthebladeis
etheinsidelines andhoseforleakingofdamage.
NDCONTROLVALVEMOUNTINGS.Ob-
dcontrolvalvemountingsforindicationsoflooseness.
TROLLEVERS,ANDDRIVEBELTS.See'
ytomovementofcontrolleversandthat control
senessorbinding.Observedrivebeltsto seeifthey
L.Whenjettisoningtheblade,seethatjetti-
tesproperlyandthatjettisoningcableend releases
oningcablepassesthroughbowgun opening,be
omeentangledwithequipmentor personnel.
vicewillberegardedasminimummaintenance
rformedunderalltacticalconditions.
efollowingprocedures,correctanydeficiencies
reportthemto designatedindividualinauthority.
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Services
EETH.Raisebladeandcleanallroots,stones,
handinspectblade,wings,and teethfordamage.
ade,bladeteeth,andsidearmswhile performing
emaybe lowered.
UNTINGBRACKETS,PIVOTBEARINGS,
heseitemstoseethattheyaresecurelymounted
tpivotbearingsare securelylatched.
ASSEMBLY,ANDCABLES.Inspecttripod
ettisoningassembly,andaccessiblepartsofcable
magedandthattheyaresecurelymountedand
ACKSUPPORTS.ExaminetheseHemsto
conditionandsecurelymounted,
SE,ANDGUARDS.Inspectaccessible
s,andparticularlypressurehosetohydraulicjack
magedandthattheyaresecurelymountedand
S.Examinetheseitemstoseethattheyarc
leaking,andthatpipelines andhosearesecurely
S.Inspectpump,pumpmountings,andcon-
and connectionsarenotleakingandmountingsare
EVER,DRIVEBELTSANDBELT
ltforcorrecttensionandbeltguardfor secure
LANDMOUNTING,Inspectjettisoning
tisoningcable issecurelyattached;
DWEEKLYSERVICES,
onServiceisparticularlyimportantbecauseatthis
orcrewinspectsthemine excavatortodetectany
edevelopedandtocorrectthosetheyarepermitted
inspectionshouldbereportedpromptlytothe
thority.
ormingtheAfter-operationServicetheoperator,
mberandconsideranyirregularitiesnoticedduring
eration,During-operation,andAt-haltServices.The
onsistsofinspectingandservicingthefollowing
dbyanasterisk(*) requireadditionalweekly
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EETH.Inspecttheseitemstoseethat there
eldsinthe blade,thatthewingsandteeth arenot
gsswingfreely.Besure winghingepinsandtooth
andsecure.
UNTINGBRACKETS,PIVOTBEARINGS,
idearmsandmountingbracketsforbroken
atbracketmountingcapscrewsaresecure.Besure
agedandthat thelatchesoperateproperly>
ASSEMBLY,ANDCABLES.Inspect'i&pod
sandsecuremountingpins.Seethatjettisoning
andoperatesproperly.Besurecablesare notworn\
connected.
ACKSUPPORT.Examinehydraulicjack
semblyweldsarenotbrokenandall mountingbolts
e hydraulicjackisnotleakingandthat thetrunnion
S,HOSEANDGUARD.Inspecthydraulic
thattheyarein goodcondition,securelyconnected,
pe guardissecurelymountedandthatthe pressure^
fing.\
NGS,LINES,ANDHOSE.Besurethatthe
perleveland reservoirmountingsaresecure.
seto seethattheyaresecurelymountedandcon-v
aminescreeninreservoirtosee thatitis cleanandI
caparenotclogged.
DMOUNTINGS.Examinepumpandpump
ecureandnotleaking,andmountingnuts andcap
EVER,DRIVEBELTSANDBELT
mstoseethatthey arcingoodconditionandthat
trolvalvewithoutbindingorlooseness.Besurethat
ger-pressuredeflectionhalfwaybetweenpulleys
urelymounted.
LANDMOUNTING,Besurejettisoning
perlyandthatjettisoningcableis securelyattached
dmountingnutsand capscrewswhereinspec-
essity.
ksupportnutsand capscrewsandtracksupport
dcapscrews.
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Services
vator.Besuretoremoveall stones,shells,and
keteeth.
mud,or dirtfromMineExcavatorwhen
e mineexcavatorlistedontheLubrication
rication.Besureto coatmouldboardwithused
ointslistedonthe LubricationOrderasrequir-
NTENANCE(SECONDECHELON).
ncyofthepreventivemaintenanceservicesout-
minimumrequirementfornormaloperationof
nusuallyextremeoperatingconditions,itmaybe
ainmaintenanceservicesmorefrequently.
on.Thecrewshouldaccompanytheirmine
mechanicswhileperiodicsecondechelonservicesare
ecrewshouldpresenttheunitfora scheduledpre-
viceinareasonablycleancondition;thatis,itshould
mudorcoveredwithsandtosuch anextentthat
willbeseriouslyhampered.However,theexcavator
ped thoroughlyclean,sincecertaintypesofdefects
ooseorshiftedparts orassemblies,aremoreevident
oiled ordusty.
ormation.Ifinstructionsotherthanthose
oceduresinsubparagraphd,or thespecificpro-
e,whichfollow,arerequiredforthe correctperform-
tenanceserviceorforthecorrectionofa deficiency,
vatoroperator'smanualpertainingtotheitem in-
vidualinauthorityshould beconsulted.
esegeneralproceduresarebasicinstructions
henperformingtheserviceson theitemslisted
NOTE:Thesecondechelonpersonnelmustbe
eproceduressothatthey willapplythemauto-
edsubassembliesareinstalledto correctadefi-
entoseethat theyareclean,correctlyinstalled,
djusted.
ofeachitemapplies alsotoanysupportingmem-
allyincludesachecktosee whetherornottheitem
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tlyassembled,secure,orexcessivelyworn(par.
itdifficulttoperformthe completepreventive
tonetime, theseservicescansometimesbehandled
mpletealloperationswithintheweekif possible.All
n bivouacareasmustbeutilized,ifnecessary,to
nceoperationsarecompleted.
eproceduresforperformingeachiteminthe
ntenanceproceduresaredescribedinthefollowing
arthas twocolumnsatitsleftedge corresponding
0-hourmaintenancerespectively.Veryoftenitwill
roceduredoesnot applytobothscheduledmain-
minewhichproceduretofollow,lookdownthe
hemaintenancedue,andwhereveranitemnumber
ationsindicatedoppositethenumber.
spectthebladeto seeifassembly
utsarepresent andsecure.Seethat
n goodcondition,andwinghinge
nsare presentandsecurely
gBrackets,PivotPins,Pivot
aminesidearmstoseeifblade to
kmountingbracketsarein good
gnutsandcapscrewsare secure.
otbearingsarenotexcessivelyworn,
operly,andjettisoningcablesare
bly,andCables.Inspecttripodto
reintact,andmountingpins are
ejettisoningdeviceisproperly
ndthatitoperatesproperly.Examine
notfrayedandthatall cablecon-
pportBracket.Examinehydrau-
seethat itisin goodconditionand
capscrewsarepresentandsecure.
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Services
perendof jackpistonandjack
essivelyworn.
es,Hose,andGuard.Inspect
licpipelinesandhosetosee that
dthatall connectionsaresecureand
e pressurehosetojackisnot
ets.Seethatpipelineguard is
ntings,PipeLines,andHose.
es,andhosetosee thattheyare
thereare noindicationsofleaks.
e,andmountingsaresecure.Remove
that thescreenisclean,thehydrau-
andbreathervents infillercap
pMountings.Inspecthydraulic
stoseethat theyareingood
yandmountingcapscrewsare
mpconnectionsarenotleaking.
ver,DriveBelts,andBeltGuard.
dcontrolleverstoseethat theyare
the leversoperatethevalvewith-
esuredrive beltsarenotfrayed
adjustedtohave%-inchfinger-
aybetweenpulleys.Seethatthebelt
.
hileraisingtheblade,examineall
or indicationsofleaks.Lowerthe
nneutral(hold)position,and stop
ndMountings.Examinejettison-
atitoperatesproperlyandthat the
surejettisoningcableissecurely
hethersupplyofthelistedspare
ystowed.Thissupplyshouldbe
eentiremineexcavatorunitaccord-
ationOrder.Besure lubrication
nand secure.
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mpleted).Checkunitthoroughly
nworkordershavebeencompleted
478.Enterany modificationsor
acementsmadeattimeofthis
ols forthemineexacavatorare
,andproperlystowed.
ubleshootinginformationandtestswhichcan
ethe causesofsomeofthetroublesthat maydevelop
r.Eachsymptomoftroublegivenunder theindi-
lowedbyalistof possiblecausesofthetrouble.
erminewhichoneofthe possiblecausesisrespon-
xplainedaftereachpossiblecause.
ESERVOIR.Fillreservoirtolevelmarkon
VALVEPRESSURE.Adjustreliefvalve(par.
placecontrolvalveassembly(par.50).
AGED.Inspectpumpandreplaceorrepair
PIPELINESORHOSE.Replacebrokenpipe
d45).
RAULICLINE(BETWEENRESERVOIR
servoirandremovepipelines,connections,and
structionsandreplaceconnections,pipelines,and
RAULICLINE(BETWEENCONTROL
CTION).Removehose,pipelines,andcon-
etojack.Removeobstructionandreplaceconnec-
par. 44).
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Up.
LINESBETWEENCONTROLVALVE
ctionsorreplaceasnecessary.
ROLORRELIEFVALVES.Inspectcontrol
ceifnecessary(par.50).Ifvalvecan berepaired,
Raise.
eplacepump-assembly(par.48).
PING.Adjustdrivebeltstocorrecttension
E.Replacecontrolvalveassembly.
EVERINRAISEORLOWERPOSITION
EACHEDENDOFTRAVEL.Usingcorrect
wcontrollevertoreturntoneutralposition when
poilsupplyinreservoirup tolevelmarkon
oirandrefill withnewoilasspecifiedin
LINEFROMRESERVOIRTOPUMP.'
pipelines.
GTHROUGHRELIEFVALVE.Usecorrect
L.Useoilasspecifiedin LubricationOrder.
andsonJack.
KING.Tightenhydraulicjackpackingnuts.
Pressure AfterBeingAdjusted.
INGNUTISNOTLOCKED.Removerelief
plug,andadjustrelief valvetorequiredpressure.
n.
stoRemaininEngagedPosition.
SPRINGBROKEN.Replacejackconnect-
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LY.
stoRelease.
OJACKCONNECTINGPINDISCON-
nnectorreplacejettisoningcablefromcabledrum
sFailto OpenWhenJettisoningLeverIs
ROMCABLEDRUMTOSIDEARMPIVOT
ISCONNECTED,ORBROKEN.Connect,
ngcablefromsidearmpivot mountinglatchesto
EMBLIES(RIGHTANDLEFT).
dbladeassemblies,rightandl eft,areidentical
boltedtogetherformablunt-pointedV.Eachblade
eandis ofweldedarmor-plateconstruction.Eleven
gtheloweredgeofeachbladeassembly,aremounted
Eachtoothisheldin positionbyanattachingpin
ein theupperendofthe toothaswellasthe holes
othedcompartment(fig.7).Adirtshieldis
eedge ofthemainbladebyattachingpins.The
overtheteethandpreventsdirt frompilingaround
tedtotheouteredgeof thebladebyapivot pin
wingoutwardwhenexcavating(fig.7).The rear
ahingedpivotmountingwhichisused toattachthe
k(fig.9). Thefrontend(nose)ofboth rightand
iesareflangedinside andoutsideandacrossthe
oltsequallyspacedalongtheseflangesconnectthe
emblies.Theright andleftarmandbladeassem-
ear oftheVbya flanged,box-typecrossbeam.
uallyspacedalongtheseflangesateachendof the
eamtothearmandbladeassemblies.
wenty-four%-inchnutsandlockwashersfrom
ghtandleft armandbladeassembliesatthefront
nty-eight%-inchnutsandlockwashersfromthe
eamtotheinsideof thearmandbladeassemblies.
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OOTH
gPin
%-inchboltsfromthefrontedge(nose)andthe
sfromthecrossbeam.
theboltholesin thefrontedge(nose)of the
deassemblies,installtwenty-four%-inchbolts.
htenthenuts finger-tight.Installfourteen%-inch
beamtotherightarmand bladeassemblyandtighten
nleftarm andbladeassemblywithboltholesin
allfourteen%-inchboltsin leftsideofcrossbeam
bly.Installlockwashersand nutsandtighten
four%-inchnutsconnectingrightandleft armand
dge(nose)securely.
NTING.
esidearm pivotmountings,rightandleft,are
calinconstructionandmounting.Themounting
utespringsuspensionassemblyofthe tanktothe
nsionassemblyandisattachedbytwocap screwsat
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OSED
EN
ClosedandOpen
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ndPivotBearing
f/Mounting
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olts attheupperrearof thebracket,andthree
ebrackethasapivotpin weldedtothelowerrear
hepivotbearingon therearendofthe armand
untingtheexcavator.
derthe wedge-shapedblockwhichiswelded
side ofbracket.Removetwo%-inchcapscrews
frontlower edgeofthebracket.Removefour
ersfromthe boltsattherearupper edgeofthe
nearsonlockingplate atrearofbracketand
thejackand removebracket.
MountingDevices
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tionofthebracketassemblyisaccomplishedby
edureasoutlinedinsubparagraphbabove,being
inchcapscrewsin frontloweredgeofbracket
EMBLIES(TRACKMOUNTING).
upportassemblies(trackmounting),rightand
uctionandmounting.Theanglesupport(track
ht-anglesteelbracketattachedtotheouter edge
suspensionassembly.
%-inchcapscrewsandlockwashersthatattach
utesuspensionassembly(fig.11).
tionoftheanglesupport (trackmounting)is
reversingtheprocedureforremovalasoutlinedin
BLY(TRACKMOUNTING).
ockassembly(trackmounting)consistsofa
bracketcapwithtwo%-inchholesdrilledand
hendsofthe cap(fig.11).
rsonplatebetweenvolutesuspensionbracket
ojacksbeneathcenterof springseatsandraise
espringshasbeentakenup. Removethenutsfrom
movelockingplate.Removethenut fromthe
evolutesuspension"bracketcap(fig.11).
tionisaccomplishedbyexactlyreversingthe
paragraphbabove.Besureto installthenutonthe
lnuts securelyandlockthenutswithlocking
SSEMBLY.
sof barconstructionshieldedbyarmorplate
bothsides. Itismountedon theexcavatorand
s.Therightside-barofthe tripodextendsdownward
therightarmandblade assemblydirectlyabove
.Theleftside-barofthetripodextendsdownward
geoftheleftarmand bladeassemblydirectlyabove
.Theforwardbarofthetripodextendsdownward
ntingpin totheupperendof alink.Thelowerend
untedtotheinsideflangesofthearmand blade
dbyamountingpin(fig.12).
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andSupport
erpinsfromtripodfrontlinkattachingpinand
hingpins.Removeattachingpinsfromfrontlink
movetripod.Seeparagraph37 bforremovalof
TTISONINGARM).
ningarmguardassemblyismountedonthe
darmorplate.Theguardconsistsofa triangular
edarmorplateandismountedbya hingepinat
nchcap screwsatitsupperedge.
otterpinfromoneendof hingepinanddrive
weredgeofthe guard.Removetwol/2-inchcap
eofthe guardandremoveguard.
tionisaccomplishedbytheexactreversalofthe
paragraphbabove.
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NASSEMBLY.
nnectingpinassemblyislocatedatthetop of
essiblewiththejettisoningarmguardopen.Acyl-
singis weldedtotheleftinside wallattheupper
sideendofthepin andspringhousingisthreaded
.Thepinis spring-loadedtokeepthejackconnect-
duntilthejettisoningof theexcavatorisdesired.
emblethejackconnectingpinassembly,remove
omtheupperedgeof thejettisoningarmguardand
otterpinandlink pinfromendofjackconnecting
sdownandunscrewthespringretainercap.
oncapasit leavesthelastthreadas itisspring-
gandjackconnectingpin.
yisaccomplishedbyexactlyreversingthepro-
graphbabove.
RMASSEMBLY.
ningpivotarmassemblyismountedonthe
ybeneaththe guard.Thelowerendofthe pivot
nshackleandshacklepin tothejettisoningcable.
tarmisconnectedbypinsand linkstotheoutside
pin.Whenthej ettisoningcableispulled,the
mmovesdownwardandthroughtheconnecting
nnectingpinintothereleasedposition(fig. 12).
soningpivotarmguard(par.34 b).Remove
pin fromthelowerendofthe pivotarm.Remove
fromupperendof pivotarm.Removethecotter
ngpin andslidethepivotarm offmountingpin.
tionofthejettisoningpivotarm assemblyis
reversingtheprocedureforremovaloutlinedinsub-
RUMASSEMBLY.
ningcabledrumismountedonthe centerofthe
sthetripodside-bars.Thejettisoningcablefromthe
ttisoningcableswhichareconnectedtotheside
pedtothecable drum.Anarmweldedtotheout-
connectedtothejettisoningoperatingcable.As
seto themovementofthejettisoningleverinthe
othepivotarm pullsthejackconnectingpininto
esametimethe cablesattachedtothepivotlatches
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selatchesallowingtheentiremineexcavatortobe
e%-inchcapscrewsandthree%-inchflat
blestothe drum.Removethecotterpinandshackle
eratinglever.Removethey8-inchnutfrom the
andremovethe%-inchcapscrew,the%-inchflat
cer.Removethejettisoningcabledrum(fig.12).
ejettisoningcabledrum,exactlyreversethe
linedinsubparagraphbabove.
Y.
ablepulleyismountedbetweentwoears which
rofthetripod (fig.12).Thejettisoningcablewhich
n thecabledrumpassesoverthetripod cablepulley
tripodandintothetank throughthebowgun
tedtothe jettisoningcontrollever.
%-inchnutandy8-inchlockwasheronthetripod
emovethe%-inchcapscrewandthetripod,cable
tionofthetripodcablepulley isaccomplished
e procedureforremovaloutlinedinsubparagraphb
licjackisathree-section,telescopic-typejack.
s mountedinatrunnionblockandis attachedto
upportbracket.Thehydrauliclineentersthe jack
hemain (lower)section.Thecenter(second)
emain(lower)section,andboththemain and
edwithpackingandpackingglandsattheir upper
hethirdor uppersectionhasahole(eye) through
oseofconnectingthejacktothe tripod(fig.13).
ontractionofthefrontsupportassembliespro-
hrough44b, mustbeperformedinsequence.Place
erendof thejacktocatchthehydraulicfluid,and
eflexiblehosebetweenthejackand thehydraulic
etoprotectthedisconnectedendofthe flexible
pelinewith cleanclothstopreventdirtfromenter-
apscrewsandlockwashersfromthejacktrunnion
pperpillowblock,andremovejack.
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Guard
ionofthejackis accomplishedbytheexact
orremovaloutlinedin subparagraphbabove.
ulicflexiblehose,besurenodirtor foreignsubstance
hose.
SSEMBLY.
licjacksupportboxassemblyconsistsofa
Theupperendoftheboxcontainsa pillowblock
cktrunnion.Ahole throughthelowerendofthe
pillowblock,providesthemeansofsupportingthe
oxsupport.NOTE:Theupper holeinthejack
quippedwith thetriple-stagetelescopicjack,and
hesingle-stagejack.
ngthejack(par.40A),removecotterpinfrom
movejackboxpin.Lowerthejackboxout ofjack
boxbyexactlyreversingtheprocedurefor
ragraphbabove.NOTE:Whenasingle-stagejack
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regulartriple-stagetelescopicjack,jackmounting
Placeaspacerbetweenthejackmountingboxand
einstallingthe jackboxpin.
SSEMBLY.
xsupportassemblyisconstructedofwelded
to providingthemeansofsupportingthejack,
dsthehydraulicflexiblehoseandconnections.The
assemblyisattachedtotheupperpipe guardbya
ackboxsupportisconnectedbypins ateither
orts(fig.13).
erpinsfrompinsthroughlowerrearof jack
ort,andremovepins.Removecotterpin fromend
pperendof jackboxsupportandguardassembly.
liftoffjackboxsupport assembly(fig.13).
tionofthejackboxsupport assemblyisaccom-
salofthe procedureforremovaloutlinedinsub-
ASSEMBLY.
elineguardassemblyconsistsofweldedarmor-
edtothelineguardbythree %-inchnuts.Theout-
doverthelineguardand shieldsthehydraulicpipe
e%-inchnutsandlockwashersfromoutside
andlift offoutsidelineguard(fig.14).
tionoftheoutsideline guardisaccomplished
ocedureforremovaloutlinedinsubparagraphb
SEMBLY.
neguardconsistsof weldedarmor-platecon-
ankalongtheupper boltlineofthe finaldrive.In
hydrauliclineoutsidethe tank,theguardprovides
achingthejackboxsupport.
%-inchnutsandlockwashersfromthestuds
ardto thefinaldriveofthe tank,andliftoffline
tionoftheupperline guardisaccomplishedby
ocedureoutlinedin subparagraphbabove.
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LINES.
ehydraulicpipelinesconsistofelbows,nipples,
lexiblehose.Thepipeline isinstalledthroughthe
ghtside ofthetank,andis supportedandpro-
bolt linebythepipeguard.
heunioninsidethetankanddisassemblethe
henipplethatpassesthroughthe headlightopen-
ydraulicpipeline.Capor protectallopeningsto
tionoftheoutsidehydraulicpipeline isaccom-
salofthe procedureforremovaloutlinedinsub-
allingthehydraulicpipe linesandconnections,be
achpipe connectionclean.
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NES.
ydraulicpipelinesconsistof nipples,elbows,
e,andpipe.Thehydrauliclinesconnectthereservoir
thecontrolvalve,andthecontrolvalvetothe out-
rnline connectsthecontrolvalvetothereservoir.
ylineconnectedtothereservoir,thereservoir
onnectatunionor removehoseonauxiliaryreturn
and fittings.
tionoftheinsidehydrauliclines isaccom-
salofthe procedureforremovaloutlinedinsub-
etokeepinterior ofallhydrauliclinesclean.
ARD.
licpumpbeltguardisof weldedsteelcon-
orear ofthetransmissionhousingby4 capscrews.
tguardattachingcapscrews,andremoveguard.
Y
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tionofthehydraulicpumpbelt guardisaccom-
salofthe procedureforremovaloutlinedinsub-
ehydraulicpumpdrivebelts areV-typeend-
fthehydraulicpumpguard,seeparagraph46 b
rontuniversaljoint,see TM9-759paragraph111
stingscrewdirectlybeneathpumpandnuton
mptoswingdownward.Removebeltsfrompump
tuniversaljoint.
umpbeltsmustbeinstalledin pairsofequal
vepulleysatuniversalj ointandoverhydraulic
ionofuniversaljoint,seeTM 9-739.Afterre-
,adjustbeltswithbeltadjustingscrewto have%-
ctionhalfwaybetweenpulleys.Afterbeltshavebeen
adjustingclampboltnutsecurely(fig.16),
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ehydraulicpumpis abelt-driven,gear-type
rtbracketandadjustingplate attherearof the
upportbracketisattachedtothetransmissionby
vercapscrews,andthepump isboltedtothe
bolts.
irandremovehydrauliclinesfromreservoir
controlvalve.Removehydraulicpumpbeltguard
beltadjustingclampboltandbackoffbelt
ytoallowbeltstobe removedfrompumppulley.
len)setscrewinhub ofpumppulley,andremove
nchnutsandlockwashersfromboltsthatattach
emoveboltsandpump(fig.17).
tionofthehydraulicpumpis accomplishedby
ocedureforremovaloutlinedin subparagraphb
ACKET.
mountingbracketassemblyconsistsofawelded
edbyapivotbolt andbushingtoamountingplate.
chedtothe reartransmissioncasecoverbyfour
mpandpumpbracketcanberaisedor lowered
rivebeltsby anadjustingscrewontheright side
tthroughthe lowerflangeofthepumpbracket
plateprovidethemeansofclampingthe pump
ountingplatewhenthe desiredbelttensionha,s
cpumpremoved(par.48b),removefour
kwashersfromloweredgeofpumpmounting1
gplatefromreartransmissioncasecover.To
mpumpmountingplate,removey8-inchnutand
oltbeneaththepumpbracket.Removeboltandflat
mountingplate.Removecotterpin,1-inchnut,
acketpivotstudand removepumpbracketfrom
tionofthepumpbracketonthe pumpmounting
fthe pumpmountingplateonthereartransmis-
ishedbytheexactreversalofthe procedurefor
ragraphbabove.
ehydrauliccontrolvalve,mountedonfour
earofthereservoir,consistsofa cast-ironvalve
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pool.In additiontothevalvespool,the valve
oaded,conical-shapedreliefvalve.Theadjustment
esthepressuremaintainedin thehydraulicsystem.
thereservoir,removethehydrauliclinesfrom
ontrolvalveand fromthecontrolvalvetothe
movetheauxiliaryreturnlinefrom thecontrol
movethecotterpinand connectingpinfromthe
omofthe controlvalvespool.Removefour%-inch
mthestuds whichattachthecontrolvalvetothe
trolvalveandgasketfromreservoir.
tionofthecontrolvalveis accomplishedbythe
edureforremovaloutlinedinsubparagraphb above.
eventdirtorforeignobjectsfromenteringthe
nesdaringinstallation,
reservoirconsistsof aweldedsteeltankpro-
eenin thefillerneck.Aventedcapandoil level
er neck.Thereservoirismountedonbrackets
nt endofthetransmissioncase.Thecontrolvalve
ountedonthelowerrearedgeof thereservoir.
rvoirhasbeendrainedandthe controlvalveand
nesareremoved,removethecapscrewsfromthe
ets.Removethereservoir,Toremovethereservoir
servoirin theturretandturn theturretuntilthe
eep thecontrolvalveoperatingleverstowardthe
voirfromthe tank.
ffvalveisatwo-wayvalvemountedinthe bottom
sition,thevalveallowsthehydraulicoilto flowfrom
position,thevalvedrainsthereservoirandcloses
ump.
rhasbeendrained,disconnecttheuniononthe
ervoirtothe pumpandremoveshut-offvalvefrom
tionoftheshut-offvalveis accomplishedby
ocedureforremovaloutlinedin subparagraphb
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tructionandtheuseforwhichthis excavator
fauxiliaryequipmentarenecessary.
ublishedforthe informationandguidanceof
hirdandhigherechelonsofmaintenanceonthis
nformationbeyondthescopeofthetools,equip-
yavailabletousingorganizations.
nnotbefurnishedforrepairingthe partslisted
w.Theyare ofarmor-plateorheavysteelconstruc-
ofnecessitybedeterminedbywhateverdamage
ustain.However,thefollowinginstructionsmay
amagedparts.
fheatis notrecommendedwhenstraightening
of itscomponentparts.Heatweakensstructural
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mbersandallstraighteningshouldbedonecold
rtsofframeassembly,tripod,mountingbrackets,
buckledsufficientlytoshowstrainorcracksafter
forcedorreplaced.
blishedrulescanbemadeonthenecessityor
nstallwhentheblade,side arms,teeth,tripod,or
eenbentorbroken.Reinforcementscanbemade
stock.Becauseofthedifficultiesencounteredwhen
ements,theuseofanglereinforcementsisrecom-
ble,thereinforcementshouldextendoverthelength
traightened.Thereinforcementstockusedshould
engthandthicknessasthepartthat isbeingre-
c-weldingmethodisrecommendedforallmain
ding.Heatgeneratedduringweldingislocalized,
minimizedwheneverthismethodisused.Addi-
finishedweldscanbeground,filed, anddrilledas
ustbesubstantiallyofthesamematerialas thatused
assembly.
mbly.
bly.
gblockassembly.
pmountingbracketassembly.
tingbracketassembly.
umassembly.
mesupportassembly.
assembly.
tguardassembly.
rdassembly.
eassembly.
servoirassembly.
beltsheaves.
nglesupportassembly.
y.
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cpumpremovedfromvehicle(par.48),clean
matterfrom theexteriorofthepumpbodywith
ubthesurfaceswithastiffbrushif necessary.Dry
hreel^-inchcapscrewsfromendplate atshaft
bly.
haftandendbearingfrompumpassembly.
hesix y2-inchpumpassemblybolts,andremove
mbly.
rbasefrompumpassemblycarefully,soasnot to
veoilsealassembly.
romfront endofpumpassembly.
singsandgear casetoseethatthey areproperly
heircorrectposition.
utofthehousings,usinga driftpunchthatwill
holes.NOTE:Thedowelsmaybe removedfrom
astheyareline-drilled.
housings,whicharea lightpushfitover the
ftthe assemblybyholdingtothebearinghousing
thepumpmorethanafew inchesabovethework
ngmayslip offthebearingsatany time,thus
ousing doesnotslipoffthe bearingsfromthe
e endoftheshaftsand bearingslightlywitha
ngthepumpbythebearing housing.Thehousing
hebearingsandremovedevenlyaroundthepump
te orwearplate,bearingsmustberemovedfrom
Donotattempttopress theshaftsoutofthe
gears aremadefromonepiece.Useapuller.
verbearingand clampthepullertogetherwith
lthe bearinghasbeenliftedabout1/4inch.This
slipping offthebearing.Turnpullerscrew
canbe placedoverendofshaftunderpuller
kwiseuntil'bearinghasbeen removedfromthe
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ingbearingsinthesamemanner.Afterbearings
wearplatesandgearhousingcanbe removed.
pumpassembly,andremoveallgasketmaterial
mayremainonthe housingsorwearplates.Examine
,wearplates,oilseal andhousingstoseeif any
replaced.NOTE://thegearcase,eitherofthe
ofthe wearplatesisdamagedorworn,replaceboth
arplates,andthegear case.Thesepartsareline-
bly.
bearinghousings aretobeused,the bearingmust
sothattheycanbe pushedinandoutOfthe housing
annotbepushedinandout ofthehousingbyhand,
aringhousingwithemerycloth.1
epump,placethevariouspartsof thepumpon
rinwhichtheyareto beassembled(fig.19).
idlergearontheworkbenchwith thedrivegear
iving endofthegearshaft pointingup.Theidler
therend upbutshouldbe behindthedrivegear.
sealingcompoundonbothsidesofthe wearplate.
rtheshaftsand gearswithsmoothsidetowardthe
nhole ontheright-handsideofthe assembly.Place
ear shaftandpressintoposition.NOTE:The
ntheshaftand notbindthewearplate.If theshaft
the assemblybytheplateandtap theendofthe
ockor softhammertofreetheplate.
e idlergearshaftandpress intoposition.
singoverthe bearings.Thishousingshouldfit
ghtpushfitwiththe hands.NOTE:Thesmallsuc-
ouldlinewiththesmall holeinthewearplate
t-handside oftheassembly.Thishousingalsohas
mpedon itneartheedge orfaceofthehousing.
or towardthegearssothatit willmatchasimilar
whichshould beassemblednext.
ump bodyoverthegearswiththe correctletter
hthe letteronthefrontbearing housing.NOTE:
etter markings,onetomatchthefrontbearing
he letterintherear bearinghousing.
lingcompoundonbothsidesof thewearplate.
theshafts withthesmoothsidetowardthegears.
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olesof thesamesize,oneforthe suctionand
eithermaybeusedforthe suctionport.
the shaftsandpressintoposition.Turnthe shafts
fterthebearingsare inposition.Iftheshafts are
with awoodenblock.
ingoverthe bearingswiththelettermatchinga
ase.Thishousingshouldalsobea lightpushfit
riveintoposition,whichisabout1/4 inchbelow
sings.
he twolargeholesinit overrearbearinghousing.
et.NOTE:Coverhasonelargeholewhichis the
ustbeplacedon right-handsideoftheassembly
oftherest ofthepump.
turn pumpovertocompletetheassembly.Place
wsandturnpumpover tocompletetheassembly.
pscrewsandbearinghousing.
verendofdrivegearshaft, steelwasherover
withbushingoverwasherand spring.Placecup
seal seatinadapterbaseassembly.
semblyoverthesealand thecapscrews,placenuts
wthe nutsdownevenlytoprevent.damagetothe
shaftandinsertdriveshaftthroughadapter
vershaftand bearing,andinstallcapscrews
oughholesin capscrewheadsandtwistendsof
rely.
MBLY.
ccontrolvalveassemblyremovedfromthe
eriorofvalveassemblyindry-cleaningsolventto
matter.Scrubsurfacesof valveassemblywitha
ddrywith compressedair.
etoverpressurevalveadjustingnut.Removelock
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semblybyturningpressurevalvecagecounterclock-
cagehasbeenremovedfromcontrolvalvehousing,
rominsideof pressurevalvecagebyturningadjust-
Removespringandvalvefrom pressurevalvecage.
t-headedplugabovecontrolvalve(spool).Remove
screwsfromsealretainerbelowcontrolvalve(spool).
sealretainerandcontrolvalvehousing.Remove
controlvalvehousing.NOTE:Thevalve(spool)
whileoutofthe housingsothatthesurfaceofthe
ed.
ring,andspacerfromvalve(spool).Examine
dinteriorof valvehousingforscoresorworn
)or valvehousinginteriorisscoredor worn
pass whenintheholdposition,it mustbereplaced.
oilsealretainer andreplacewithanewoil seal
eandpressurevalveseatin pressurevalvecage.
beenseatingperfectlyinvalvecage,grindthevalve
nduntilperfectseatsareobtainedin valvecage
isnotpossibleto grindvalveandcagetoperfect
revalveandpressurevalvecage.
hlyindry-cleaningsolventandbecarefulthat
ringassembly.
angedendfirst overcontrolvalve(spool)and
ool)andspacerwithspring endrestingagainst
springandinstallspringlockin grooveatlowerend
OTE:Besureallold gasketmaterialhasbeen
fcontrolhousingandfromfaceof sealretainer.
ontrolvalvehousingand placenewgasketover
rfaceofoil sealwithalight filmofoiland care-
over valve(spool).
t-headedcapscrewsthroughtheoilsealretainer
hatthegasketis correctlypositioned.Tightenthe
urely.
pressurevalvecage,beingcarefulthat valveand
espringoverendof pressurevalveandintovalve
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utwiththe slottedendupintothe pressurevalve
gnut clockwiseuntiltheslottedendofthe nutis
owtheupperendofthe pressurevalvecage.The
ustbein linewithoneofthe holesinthevalvecage.
ecageassemblyinto thecontrolvalvehousing
ecageassemblyclockwiseuntilit seatssecurely.
mentofthepressurevalvecanonlybe obtained
ountedin thevehicleandthehydraulicsystemis
gh theholeinthe pressurevalvecageandinto
lveadjustingnut.
verthethreadedendofthe pressurevalvecapand
the controlvalvehousing.
lingcompoundonthethreadsof thesquare
stalltheplugsecurelyinthe controlvalvehousing
lve(spool).
LVEPRESSUREVALVE.
sper squareinchmustbemaintainedforthe
draulicsystem.Therefore,afterthepressurevalve
rbed,thepressuremustbetested andadjustment
ner.
d,removethepipe plugfromtheteein thepres-
headlightopeningand installpressuregagein
ackcontrolin eitherraisedorloweredposition.
dtheextremeendof travelandthepressurevalve
hould indicate1000poundspressure.Ifthecorrect
topthe engineandremovethecapandgasket
valveadjustingnut.Removethepin thatlocksthe
urevalvecageandturntheadjustingnut inthe
mpleteturnclockwiseoftheadjustingnutwill
roximately50pounds,andonecompleteturncounter-
nutwilldecreasethepressureapproximately50
nstalllockpin inadjustingnutand securely
sstarted.
rehasbeen obtained,stoptheengine,removethe
pluginthepressureline tee.
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ES.
sindexesshouldbeconsultedfrequentlyfor
nsof thepublicationsgiveninthislist ofreferences
elatingtomaterielcoveredin thismanual:
eCatalog(explainsSNLsystem)ASFCat.
forsupplyindex(indextoSNL's)ASFCat.
cations(listsFM's,TM's,TC's
rsonnel,FSMWO's,OPSR's,
OFSB's.Includesalpha-
majoritemswithpublications
1-1
aining(lists MR's,MTP's,
M's,TR's,SB's,WDTB's,
edpamphletsandfiring
)FM21-6
strips,andfilmbulletins(lists
lnumberand subject)FM21-7
s graphictrainingaids,models,
21-8
LATURELISTS.
dbulldozer,tankmounting,
LG-222
mmgun,dry)SNLG-104
mmgun,wet)SNLG-204
mmgun,wet)SNLG-205
5-mmhowitzer)SNLG-104
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ack,light,andmediumfieldORD11
mifixed,includingsub-caliber,
field,aircraft,tank,andORD11
gcompleterounddataSNLR-l
aterialforpack,lightandORD11
k,andantitankartillerySNLR-6
ount,combinationgun,M34
2,andmount,combination
owningM1919A4,fixedand
andM1919A6,flexibleSNLA-6
owningM2,heavybarrel,
ndmount,combinationgun,
lubricatingmaterials,recoil
cellaneousrelateditemsSNLK-l
(forfieldartillery andcoast
tsORD6
epairofautomaticguns,auto-
l,automaticandsemiauto-
sindividualitemsandparts..SNLA-35
rvicecommand,automotiveshopsSNLN-30
cialistsandorganizationalSNLG-27
otiveandsemi-automotiveSNLG-27
dingmaterial,gasesandrelated
LF-197
rperiscopes,anddirectsighting
SNLF-235
s)(previouslyM1919)SNLF-140
-56
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ATIONS.
gtablesis main-
-mm,M2and
AD-5,andchanges
M89
2,firing:
T76-A-4
ndM2A1andM4,
'andchanes*
s.
10-580
9-1900
uments(fieldglasses,eyeglasses,
M9-575
al.TM38-250
0
ngTM21-300
M1-455
tarammunitionOFSB3-3
0-550
coilfluid,lightandmedium
msdataTM9-2200
850-15
ctionsrequiredwhenfiringtheMlhigh-explosiveroundsforthe, 105-mm
A1,or M4howitzers.
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andpreventivemaintenance
solineAR850-20
ammunitiontrainingallowancesAR775-10
1-455
gammunitionfortrainingand
FSB3-5
M9-1990
andriflerangeconstructionTM9-855
r.
icatingandweldingmaterials
the Ordnancedepartment..TM9-850
neumatictiresandrubbertreadsTM31-200
ccessoriesforFordtankengine,
C
uxiliarygenerator(Homelite
kM4andmodifications....TM 9-1731K
owningmachinegun,cal..50
arburetors(Stromberg)TM9-1826B
ordtankengine,modelGAA
ydraulictraversingmechanism
M4andmodificationsTM9-1731G
owertrain,one-piecedifferential
3andM4and relatedgun
0B
ompsonsubmachinegun,cal.
acksandsuspension,turretand
M 9-1750K
-mmtankgunmaterielM2and
eldFM9-5
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3
M3and MountsMl,M34
ombatvehicles)TM9-308
untedincombatvehicles)....TM9-324
al..30,HB,M1919A4(mounted
-50
al..50,HB,M2(mountedin
5
Operationandmaintenanceof.
re controlmaterielOFSB6-5
9-759
FM23-10
n,materialsandequipmentTM3-220
redforcevehiclesFM17-59
attackFM21-40
sFM5-25
pmentchart,groupG-Major
cles..AR850-10
gofmechanizedandmotorized
orcaliberguns,fortheUnited
opentopequipmentpub-
aintenanceDepartmentof
ailroads.
quipmentAR850-18
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vepressure
(track
(right
s(right
17
0
17
18
nce22
uipment.9
0
4
vebelts,
0
17
18
nce23
uipment.9
ve,
5E35
myuse...14
(track
ght
k
ngarm).33
y37
mbly....34
y36
embly..34
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ckmounting)
ngarm)
2
7
y32
y37
9
y
mbly
y
bleshooting26
embly
dmounting
0
18
18
nce23
uipment.9
mbly
pport
17
18
nce22
uipment9
andguards
0
17
18
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dhose
17
uipment.9
and
conditions
after
maintenance
nce(second
8
bly
7
2
rivebelts,
onreceipt
0
17
nce23
2
serviceand
sheetfor
eeled
services
yservice.19
17
'.18
ain-
ce
kafter
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bly,cables,
17
8
nce22
ipment9
y
treport....3
y
7
onOrder,
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