Tm 9-733 MINE EXCAVATOR

7/27/2019 Tm 9-733 MINE EXCAVATOR

1/65

CALMANUAL

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icDomain,Google-digitized

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2/65

NICALMANUAL

S74JANUARY1945

TONOFRESTRICTEDMATTER-

dinrestricteddocumentsandtheessentialchar-

materielmaybegivento anypersonknowntobein

atesand topersonsofundoubtedloyaltyand

atinginGovernmentwork,butwillnotbe com-

to thepressexceptbyauthorizedmilitarypublic

soparagraph23b,AR380-5,15 March1944.)

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3/65

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


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


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-


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-


etokeepinterior ofallhydrauliclinesclean.

ARD.

licpumpbeltguardisof weldedsteelcon-

orear ofthetransmissionhousingby4 capscrews.

tguardattachingcapscrews,andremoveguard.

Y


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tionofthehydraulicpumpbelt guardisaccom-


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.


/http://www.h


use#pd-google


57/65

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


/http://www.h


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58/65

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


/http://www.h


use#pd-google


59/65

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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60/65

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


/http://www.h


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61/65

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


/http://www.h


use#pd-google


62/65

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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63/65

ckmounting)

ngarm)

2

7

y32

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bleshooting26

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nce23

uipment.9

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uipment9

andguards

0

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dhose

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uipment.9

and

conditions

after

maintenance

nce(second

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rivebelts,

onreceipt

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eeled

services

yservice.19

17

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ain-

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kafter


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65/65

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nce22

ipment9

y

treport....3

y

7

onOrder,

/www.h


use#pd-google

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