Tm 5-9034 Semi-trailer 20 Ton Cpt 20

7/30/2019 Tm 5-9034 Semi-trailer 20 Ton Cpt 20

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HNICALMANUAL

PartsCatalog

M5-9034,MaintenanceManualand

er,FlatBed,20-Ton,ModelCPT20Special

Nodistribution willbemadetopersonnel

blication.

Publ

icDomain,Google-digitized

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NICALMANUAL

PartsCatalog

ARCH1943

tPrintingOffice

PublicDomain,Google-digitized

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March1943.

latBed,20-Ton,Fruehauf,ModelCPT

yispublishedforthe informationand

.

TARYOFWAR:


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ANUALYX^^lw

os.

RACTERISTICS

rterGear)

r)>

ONSANDCONTROLS

rtoSemi-Trailer8

er9

earfromSemi-Trailer9

Semi-Trailer10

10

r11

ATION ADJUSTMENT

nOperation12

ndAdjustment13

T

ANUAL

xleCamberorBentAxle20

nReplacementAxles23

agnosisandRemedy23


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os.

29

1

34

nt35

36

acement36

rake36

agm40

lve44

osisandRemedy53

ayinHook 55

osisandRemedy57

SafetyChains59

eBrackets59

ngeBrackets59

gnosisandRemedy59

LIGHTS

sisandRemedy63

M

eMembers64

ers64

mber64

emblyofaPintleHook67

SleeveRemoval68

SleeveReplacement68


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os.

1

ng71

2

angers72

osisandRemedy73

TERGEAR

75

elandAxle75

75

rtsfromtheI-beam77

AILER

4

RINGS,ANDTIRES

xle86

RearAxlef88

RearAxle89

Worn91

TiresServiceDiagnosisand

IST

WheelParis93

struction)

erGear94

5

erGear101

0I5

sConverterGear105

sTrailer107

08-109

0


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EEL113

rterGear121

123-124

26

29-131

3

Mechanism137

ORIES139

141-143

struction141

143

UMS145-147

ubsandDrums145

rums147


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nverterGear FullView

FrontView

ew

r

yinOneUnit

y

e

o

ree


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tExploded74

Rod75

6

eBracket77

earHousing,76

r:79

ve:...81

crew82

hanism83

6

mbly,87

eAssembly88

dWheelParts93

verterGear94

r95

erterGear100

r102

kesConverterGear104

kesTrailer106

e108

110

. 112

verterGear120

er122

t128

32

34

ngMechanism136

es138

onstruction140

on142

,HubsandDrums144

ndDrums146


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WITHDC4CONVERTERGEARFULLVIEW.


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MANUAL

These

fortheinfor-

eusingarms

n,maintenance,

.Theycontain

nitsandtheir

ther compo-

lasinstructions

andmainte-


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scriptionandCharacteristics

ristics

N.This20-ton,lowbed,platform

tmaybepulledbehindany heavyduty

ovidedwithasuitablepintle hook.Con-

ectedfromtrailer,thusconvertingtrailer

nbepulled behindatractorequippedwith

tinguishingfeaturesofthisvehicleare

bedtypeplatform.Frameisanall-welded

tensile,andstructuralsteel.Traileris

eelsatrear andtwoatfront.

ndconvertergearserialandnameplate

e railonrightside towardthefront.

designedforhighwaytravel.Its abil-

dependsonthetractiveabilityof thetowing

asasemi-traileris30M.P.H.;asa full

leisof theone-pieceI-beamtype

heattreated,chromemolybdenumsteel.It

eelwitha 4"x5"I-beamsection.Thespindle

oaccuratelimits.Axlesandwheelsare

,taperedrollerbearings.Simpleadjust-

madethrough largecastellatednutsanda

ntype,2%"diameterspindles,cast

atingonsteelshaftsandrockerbeamsclamped

eframe.Axleshavebronzebushingsgrooved

rakesareofa doubleanchor,two-

expandingtype.Theyhavea.16"diameter

liningis%"thickwith abrakingareaof

keshoesareprovidedwith eccentricad-

kadjusteron thecamshaft.Thisslack

adjustmentonthecamshaft.Thecam

elf-aligningballbearingtype.Actuationof

bersmountedontheaxle.Aquickrelease

rapid release.Trailerhoseconnectionis

dummycouplingsfastenedtotheconverter

xleisequippedwith16" x6"Frue-

yduty,mechanicalinternalexpandiiig-type

ofthetwo-shoetype,operatingonthe cam

rakeliningareais 1680sq.in.The360

sytosecurea quickandcorrectminorad-


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risticsOPERATOR'SMANUAL

equippedwithballbearings(self-aligning

stopreventdraggingof brakes.Brakesare

,mountedininner sectionofrockerbeam,

ncyfeature.Filtersareprovidedintheemer-

.Relayemergencyexhaustcheckvalvesare

tionsandfittingsarereplaceablewithspring

ngsareofthequickdetachabletype,

uplings.Parkingbrakesareoperatedmanu-

providedatrightfrontside ofthetrailer.

arisconstructedofpressedsteel;has

oit.The drawbarishingedatthe frontof

f hingebracketssecuredwithbolts.

a.Thewiringsystemisthe 6-8volt

edat thedropinthe frameontheleftside.

pacity.Thelightingequipmentincludesfour

ts,fourclearanceblackoutlights,onecom-

taillightat therighthandrearand one

andtaillightandblackouttail light,located

trailer.The blackoutswitchislocatedon

he siderail.Ajumpercablesupplies cur-

asocketwhichislocatedinthe centerof

hecenterofrearcrossmembertopro-

percablecanbe coupledtoanyvehicle

dthe trailer.

Mainspringsarefull-shackledtype.

ringsarethe semielliptictypeandare

steel.Bothspringsareattachedtoaxle by

springs.

ONVERTERGEAR}.Supportsare

elegadjustable,singlewheel,straddle

AILER).Trailerisequippedwith

rts.Jacksareprovidedonsupportlegs.

ngorraisingthe frontendoftrailerwhen

upledoruncoupled.Jacksalsofacilitate

ctorwhentraileristo beusedasa semi.

ntilateddisctype,10-stud,ll'/i"bolt

WheelManufacturingCompany.

lateddisctype.Sixstud,Motorwheel.

/20toconformtoFederalspecilica-

4.

Q,8ply,mudandsnow griptread,

FederalspecificationsZZ-T-381.Quantity


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HREE-QUARTERFRONTVIEW.


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DEVIEW.

dControls

3and4).Thecontrolsareemployed

er-truckcombinationpractice.Thedriver

familiarwiththelocationanduseofall con-

ptingtooperatethevehicles.

Thehandbrakeis locatedonthe

hedrop intheframe.Turningthewheel

tion,appliesthebrakes.Thehandbrake

brakeorasa supplementtothetruckbrakes,

elysteepgradeswithaheavyload.

vehicleisequippedwiththree light


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neat rearofmainframe,andonein the

ear.Ajumpercableis alsoprovided.To

forthelightingsystem,plugoneend of

ntrailerand theotherendintosocketon

s3and4).Theblackoutswitchislo-

deofthe mainframeandontherear cross-

r.Thereisno"off"positionon theswitch.

sitionorat astandardlightposition.The

nsofa coinorscrewdriver.Theflowof

towingvehicle.

gure2).Supportcrankislocated

ennotinuse, itisfoldedto theframe

ngclip.Whenuncouplingtrailerfrom

supportmaybelet downbyturningsupport

ion.

Eachsupportlegisequippedwith

ejacks,closereleasescrewandplacejack

Toraisejackpumphandleup anddown.

olcompartment.

EARREARVIEW.


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SMANUAL

ergear}(Figure3).Supportcrankis

e ontherightside.Convertergearsup-

ertergearis beingcoupledtotraileror when

Drawbarisusedtohold drawbarin

risbeingtowedalone.

Figure3).Bypullingouton coupler

ookbecomesunlocked,permittingconverter

omsemi-trailer.

GEARTOSEMI-TRAILER.a.Be

reventit fromhinging.Coupledrawbarto

tor.

ftside ofconvertergeartorightside

de ofconvertergearshouldbeattached

ngsafetychainscrossthemattopof

neath.Ifthisis donetherewillbeno pos-

ngthe ground.

stopisreached.

ergearuptofront oftrailer.Seethat

udesbelowtheupper5th wheelplateon

yso withthejawsofthe lower5thwheel.

ntilit touchestrailer.

by turninghandwheelina clockwise

rtergear,andunlockthedrawbarlock.

ontheconvertergearisopen.This

pullingoutonhooklockhandle.

ertraileruntilhookin lowercoupler

d;ifcouplingis complete,movement

cksontrailersupportsand windsup-

ed.

ndlein springbracket.

ertergeartill stopisreached.

portcrankhandle.

ngearand semi-trailer.

esbetweentractorandtrailer.NOTE:

gged"service"andtheother"emergency."

correspondinglineontrailer.


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Controls

weentractorandtrailer.

convertergearandtrailer andalsoopen

oftractor.

aketofull "release"position.

eration.

practicetotesttheoperationofyour

ingupto fulloperatingspeed.Checkthe

ge.Itshouldbenot lessthan60Ib. for

TRAILER.a.Makesurelower

tor-truckisopen.This isaccomplishedby

ckhandle.

ke onsemi-trailer.

mi-trailersothatthe upperkingpin,

eupper5thwheelplateon thetrailer,iscen-

jawsofthelower5thwheel.Continue

cksfirmly inthelower5thwheel.

head.Ifcouplingiscomplete,move-

extremelydifficult.

ction.Ifthe5th wheelhooklock

onandthehookleveris practicallyatthe

eltheunit isproperlycoupled.

semi-trailer.Careshouldbetakento

airhoseconnectionishookedupwiththe

the "emergency"airhosewiththe"emer-

hosesand trailerconnectionsaretagged.

rd.

ortjacksandraisesupportsbyturning

ockwisedirectionuntilthestopisreached.

pringbracket.

nthesemi-trailer.

ERGEARFROMSEMI-TRAILER,

keson semi-trailer.

satrearoftractorand disconnectthe

fconvertergearanddisconnecttheair

onvertergearareequippedwith

otinuseall aircouplersshouldbecon-

ers.Dummycouplerspreventforeignmatter


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SMANUAL

m,andprolongthelifeof therelayemer-

tingairhoses,careshouldbeexer-

onairhoses fromdraggingontheground.

nnected,hangitupimmediately.

able.

-trailer.

wnuntilloadof traileratfrontis carried

tergear.

rtergearbypullingout onhooklock

titfromhinging.

omunder semi-trailer.

onvertergearuntilstopisreached.

FROMSEMI-TRAILER.a.'Set

ailer.

wnuntilloadatfront endoftrailerrests

eentractorandtrailer.

es.

mergencyairlineautomaticallysets

esurethatall dummyhosecouplingsare

thattractorhosesarecoupledtogether.

erof dirtorforeignmatterenteringthe

percord.

eelhookbypullingout onhooklock

onhook lockhandle,thehooklock

vetotheunlockedposition.Ifhookhandle

onsemi-trailerisbindingagainstthe hook

benecessarytopullthe hookhandleto

and.

thsemi-trailer.

AILER.a.Generalinstructions.

mbinationisdrivenin muchthesameman-

Thefollowinghints,however,shouldprove


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Controls

cetotesttheoperationof thetrailer

tofull operatingspeed.Checktheairsup-

houldnotbeless than60Ibs.forproper

ghtsshouldalsobetested.

careshouldbetaken toallowforthe

heelsturn"inside"theturningradiusof the

ckshouldbesteeredin theopposite

iredthatthetrailerbe turned.

RAILER.a.Generalinstructions.

beappliedin coordinationwiththetruck

shouldnotbe expectedtocarrytheentire

willresultin rapidliningwearandgreatly

erbrakes.Thefollowingbrakingprocedure

eapplied easilyandreleasedwhenthey

s notoperatingwithmaximumefficiency.

ciency,keeptiresjustshortoftheskidding

rfor anextendedperiod,setthehand


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SMANUAL

Adjustment

HENINOPERATION.a.Purpose.

fficiency,itisnecessarythatvehicles

edatintervalsinorderthatdefectsmaybe

beforetheyresultinseriousdamage.

astingsor othermetalpartsmayoften

pletionofarun, throughthemediumof

angesindesignpromptedbychronic

nit orgroupofunits,pertinentchanges

cemethods,andchangesinvolvingsafety,

omfortshouldbeforwardedthroughtechnical

evelop.Suchactionis encouragedinorder

ayprofitthereby.

(1)Checkbrakes.

n andcasinginjuries.

ment.

eyeontraileris properlyhookedand

Whentowedas asemi-trailer,checkthe

wingvehicle.

tion. (1)Duringoperation,thedriver

nusualsounds,noisesordrivingcharacter-

rmalfunctioningoftheunit.

lcircumstancesshouldatrailerbeop-

troublehavebeenobserved.Whenindoubt,

pedandassistanceobtained.Inspectiondur-

eentire vehicleandshouldbeemphasized

ructionperiod.

Ateachhalttheoperatorshouldmake

ehicletodetermineitsgeneralmechanical

etectedduringtheinarchtogetherwithde-

tshouldbe correctedduringthehalt,and

ehicleshouldbe madesothatunnecessary

majorfailureprevented.

on.Attheconclusionoftheday'sop-

ldbemadesimilarto thatmadeathalts,but

ed.Theinspectionshouldbefollowedby

defectscannotbecorrected,theyshouldbe


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djustment

hiefofsectionor otherdesignatedindi-

sshouldbecovered:

ghangers.

bolts.

htenloosestudnuts.

edwelds.

tire;securereplacementifnecessary.

etwo reserveairtanksbymeansof

ofeachtank.(Tanksare locatedtowards

e oneachside.)

5I.a.'Lubrication.Seelubrica-

bricant,whentolubricate,andmethodto

bliesandsub-assemblies.

gsupportriserscrews,removethe

stshieldto theassembly.

andbrakeshoerollers arelubricated

topackinnerandouter wheelbearings.

IONANDADJUSTMENT.a.Draw-

esideplay.Rebush.

ndblackoutswitchforoperation.Re-

nt. (1)Checkspringsforbrokenleaves.

forlooseness.Tighten.

orexcessivewear.Replacebushingand

erivets.Re-rivetor bolt.

ageandoperation.Givebrakesminor

lizationofapplication.Giveminorad-

filteraboutevery2,000miles.

ircleanerbodyaboutevery10,000

fluid.

amberdiaphragmonceeverytwoyears.

and10)of relayemergencyvalveonce

.)

femergencyrelayvalveeverysix

ngfluid.(SeeBrakesection.)

rsatrearofunit. Disassemble;clean;

ecessary.Lubricateonceayear.

r. (1)Checkallbolts;tighten.


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RYMONTH

RY2MONTHS

RY5MONTHS

VERY10MONTHS

CHART


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usethetrailerhasveryfewwearing

keptto aminimum.Moreover,thetrailer

ryingtoolssuitablefor generalcare,mainte-

Accessoriesshouldnotbeusedforpurposes

ndwhennot inuseshouldbe storedinthe

vided.

withthevehicleareillustratedin(Figure

kit assemblyarethefollowing:

nut

t

2sections


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Disconnectthedrawbarfrompintle

seunderdrawbarabout 24"fromendofeye.

mblies.(SeesectiononWheels,Hubsand

rkinthe centerofdrawbar,1"back

surethedistancefromcenterpunchmark

d ofaxlespindleonboth sides.Themeas-

al.

ired,usetheadjustableradiusrod.

onthe rodandturnthe hexadjustingnut

t sideforwardorbackwardasrequired.

menthasbeensecured,tightendown

ustableradiusrodtofix theaxleinposition.

CKAXLECAMBERORBENT

gearframe,raisefrontoftrailer,and re-

SeesectiononWheels,HubsandBearings.)

eraxle asasafetydevice.Donotuse a

twouldinterferewhencheckingforcamber.

rytoremoveaxletocheckforbendor

igure8).a.Placetheaxlegauge

eoftheaxle.

end ofthegaugeheldfirmlyagainstthe

ustthedoubleprongson theotherendofthe

einnerand outerbearingsurface.

ertothe rearsideofthe axle.Ifeither

makecontact,abentspindleis indicated.

EFORBEND.


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erminetheamountofthebend.If itisin

axle..

onespindlerevealsnobendin the

r endandchecktheotherspindlewithout

e prongs.

eitherbearingsurface,checkwitha

are incontactatbothpoints,the axleisnot

EFORCAMBER.

R(Figure9).a.Setthepointsof

hesame positionontheaxleandin thesame

tsa. and6.ofCheckingforBend.

underthe axle.

weentheinnerprongand thebearing

dnotexceed.080orbelessthan.060.I fcam-

rlimits,replacetheaxle.

gure10).a.Hoistup thetrailer

meandremovewheelandhub assemblies.

enterofaxleorawood horseasasafety

moveaxleout.

ltnuts.Removethespringspacerblock.


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EMENT.

sleadingfromemergencyrelayvalveto

smountedonaxle.

copperhammer.

easembliesatrearofeachspring.

ewinches.Slideorpull theaxleout,

odhorse.

eoperatingpartsbyremovingthebolts

rsandcambracketstotheaxle.

dingquickreleasevalvetoaxle.Remove

RAKEASSEMBLYINONEUNIT


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runbetweenchamberandquickrelease

andbrakeassemblyandan"R"on

oridentificationwhenreassembling.Remove

kingoutthe eightboltsholdingbrake

axleflangeonboth sides(Figure11).

yoffaxle.

le makesurethe1/2"dowelpinsare

s,andthenreversetheaboveprocedure.

DOWELPINSINBOTHTHE

AXLE.

OLESINREPLACEMENTAXLES.

dhorsesand followlayoutprocedurein

T

DiagnosisandRemedy.

ECAUSEPROBABLEREMEDY

ng.

naxlebymeansofadjust-

ace.

ace.

).

naxle.

nwheelsandadjustbear-


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RAKEASSEMBLY

oldstrunnionaxletospindleof rock-

awnuptootight.Atight nutwillretard

tofthetrunnionaxleandcauseunnecessary

tennutuntil bindingbeginsthenbacknut

(Figure17). (1)Placeahydraulic

berateachcorner.Jacktrailerupjust high

htofunderconstructionagainstmounting

AFTREMOVAL


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xles,Rear

boltswhichrun throughmounting

runnionshaft.

nes atbrakecylinders.

barand sledgehammerdrivethe

tingbracketsandrockerbeam.

ounteredwhentryingto drivetrun-

tingsjacksmaynotbeadjustedproperly.

ndingof trunnionshaftonmounting

nshaft. (1)Placealightfilm of

oundbushingsin rockerbeam.

kerbeamandmountingbracketswith

so thatgrooveswillalignwithbolt holesin

oltsandtighten.

dlubricate.

. (1)NOTE:Thistrailerisequipped

eontheright sideandoneonthe left.

throckerbeamsisidentical.

earcrossmemberandjacktrailerup.

n steelplateundertheouterwheel

wheels.

ubassemblies.

wheelandhub assembliesinoneunit.

drearparkingbrake rodsatbrake

pinsfromthe twoequalizers.

runnionaxlewith brakeassembly

rlineswhichrun tobrakecylinders

erbeam.

kerbeamat frontandrear.

tfrommountingbracket(Figure17).

mtrunnionshaft.

aheavybarandsledgehammer(Figure

ndlift rockerbeamout.

m. (1)NOTE:Beforeattemptingto

erationoftrunnionshaftby shovingit

rbeam.Makesurethebushingis notburred

n shaftfromslidingthrough.


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EMANUAL

%feetapart directlyundermounting

hetwo jacksandjackunitupinto

roundbushingofrockerbeamandover

kingbeamwithbolt groovesdown.

oltsandtighten.

nderwalkingbeamandlift brake

ptowalkingbeam.Fasten,usingtheeight

ers.

s tothebrakecylinders.

unnionaxleandbrakeassemblyon

ionaxleto walkingbeam,shouldnot

ghtnutwill causeunnecessarywearand

ementoftrunnionaxle.Toeliminatethe

t,tightenitup andthenbackoff1/3turn.

rakerodandthe brakerodatequalizer.

ndwheelassemblies.

ubs.

tiresandwheelassemblies.


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MENT.a.Theadjustmentoffront

.

ckadjusterwingwrenchor adjusting

se,untilthewheelcannotbeturned.

wrenchofftwonotchesormore sothat

edrum.

Visualinspectionofallbrakeshoes

thoutremovingwheelsfromthe axle.Sim-

elds,whichare boltedtobrakeadapter

hisexposestheassemblyto checkforlining

elining.

randlowerbrakeblocksbe replaced

necessityfornewlining proceedasfol-

AKES


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ddrumasan assemblywhenreliningthe

s.(Seeinstructionsforremovinghub assem-

aringssection.)

eson-innerwheelsitwillbe necessary

assembly,andthenthe hub.

rakeblocktoshoes(Figures18).

uts andlocknutsholdinganchorpins.

eckeaseof operation.

ortantthat anchorpinsmove

nwillinterferewhenmakingmajor brake

djustmentisnecessaryafterbrakeshoes

frombrakeshoes,usingaputtyknife

hoesandtighten,using boltsandlock-

reinterchangeablewithanybrake

eoverS-camandinstallwheelandhub

ustment.(Paragraph5,this section.)

REMOVAL


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rake,

oval(Figure19).Removalprocedure

ame.

holdingthe anchorpinbrackettothe

cketfreeoftheanchorpinsand pull

embly.

ereturnspring byremovingthebolt

procedureoutlinedaboveaftercleaning

;spreadingafilm ofgreaseoverboth.

EachshoehastwoOilitebushingsat

acewornbushings:

ng.

ushingswithcareas amushroomed

d freemovementofbrakeshoes,bothin

hesebushingscomereamedtoproperdimen-

llers.Thebrakeshoerolleroneach

haftfastenedbythree heavyprickpunch

shaftsmaybe drivenoutandrollersre-

heshoesfromtheassembly.

R.a.NOTE:Replacementproce-

rcamisthesame.EXCEPTION:Rear

mbracket.

AMSTEPONE


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NUAL

omeinrights andlefts.Whenreplac-

kento placethepropercamonthe proper

amshasanumberstampedon it;even

erleft.

bassembly.

asherattheslackadjusterend ofthe

mslackadjusterarmand tapslackad-

e20).

ndworkit backtowardcamend

AMSTEPTWO

ovefeltsnapringandfelt retainer

eedlebearingswitha mediumlight

reaseintobearingswithfinger.Holdthe

rtcamin position.Careshouldbetakennot

sin themountingplatebrakeadapter.

tlinedabove.

earings.Camneedlebearingswill

roperlylubricated.However,iftheyare

nt,orinremovingandreplacingcam,proceed

gsineachmountingplate adapter

tone timebydrivingthemoutwith a


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AMSTEPTHREE

CEBALLBEARING


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NUAL

earingsinto positionandtapgentlyto

dagainstboth brakeadapterandbear-

ginto positionwithaC-clamp.Bearings

uteredgesoftheadapter.

aringsdo notcoverlubricatinghole.

ingincambracket,frontonly. (1)

r.(SeeCamReplacementinstructions.)

ecambracketandtheball bearing

eAlemitefitting,insertasmall screw-

hole andpryoutwardagainstthebearing.

bracketwithasmallhammer.

STER.a.Thistraileris equipped

woatthe frontandeightatthe rear.These

oseatthe reararenotequippedwithwing

ecessarytousean adjustablewrenchto

ers.

kadjusterwingwrenchfailsto bring

the drum,thewormorwormgearis usually

etheseparts,proceedas follows:

ormgear(Figure24). (a)Remove

wrenchadjusterbyturningoutonthe hex

TEREXPLODED


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rake*

sstripped,replaceitas anassembly.

ondition,prythelockring (2)free

emovetheshield (3),felt(4)and worm

sstripped,replace.

er. (a)Driveoutthe oldbushing.

adjustersare interchangeableex-

ur slackadjustersatrearunderconstruction.

slackadjustersare groundononesideto

rakeadapter.

EMENT.a.Brakedrumsshouldbe

badlyscored.Heatchecking,unlesssevere

m replacement.

binan assembly.

efrontwheel,blockthewheelatboth

mby removingthetennutsholdingit tothe

Whenremovingreardrumsit willbe

elassemblyfromhubandthehubassembly

slot-headedboltsandlift thedrumoffhub

inthedrumpilot andinstallthenew

VAL


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NUAL

ppositenutstobringthe drumdown

ngonthepilot.

MENT.a.Theprocedurewhich

rear brakeswhennewliningsordrumshave

h anchorpinssothatthe anchorpins

drumassembly.Ifit failstomove

ackadjusters throughcounter-clockwise

usterwingwrenchandcentralizeanchorpin

e,turntheslackadjusterwingwrench

retightin thedrum.

horpinto rightandleftas youtighten

til thebrakeshoesarecentralizedinthe

t theclearanceat.010attheeccentric

ndofthebrakeshoes.

anchorpinswhileholdinganchor

awrench.

REPLACEMENT(Figure26).a.

ocatedon therightside,atthe dropin

na clockwisedirectionappliesthebrakes.

(1)Driveoutdrive pinandtapwheel

Loosensetscrewinstopcollarandturn

ise,directionuntilscrewisturnedoutof

ldbemadeto straightenbentscrews.

)Removetheclevispinfromratchet.

twasherfromratchetpin,anddrive pinout.

flatwasheranddrive outpawlpin.

replacepawl.

KINGBRAKE.a.Usuallythehand

eattention,theminorbrakeadjustment

keadjustments.However,whenanadjust-

two pointsofadjustmentwhichmaybeused.

elyorboth atthesametime.Oneadjust-

rteningthe brakerodathandbrakeratchet

stmentmaybemadeby shorteningthe

dtobrakecylinderlever.

andbrakeratchet(Figure26).

runnionaxle andjackuntilwheels


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BRAKE


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dereachouter wheel.Thiswillpre-

cillatingwhileadjustmentisbeingmade.

made,removetheblockfromunderouter

derinnerwheelsandthen checkadjustment

EXPLODED

27)a.Removel.-(l)Disconnect

sbetweentheleveron right-handsideof

(15).

kerods(30B)at crossshaftlever

erandrod(32C).

ingcrossshaftlevers (28)tocross

off theshaft.

ruffkeys(36).

fromjournal (33).

aft andpulltheshaftout.

acementofcrossshaftisin reverseof

hasbeeninstalled andbeforeat-


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shaftforeaseofoperation.Crossshaft

ngis felt,checkleversatendofshaftto

bindingagainstjournal.If leversarenot

dabind isstillfeltdrive thejournalsone

ftoperatesfreely.Beforeinstallingclevis

lightfilmofgreaseon them.

BER

gure28).a.Thistrailerisequipped

onfrontaxle.Theyareinterchangeable.

nofthebrakechamberistoconvert

airintothe mechanicalforcenecessaryto

ainstthebrakedrum andapplythebrakes.

ergencyvalveentersport(1) behindthe

eforcedevelopedmovestheflexible

shplate(3)andattachedpushrod (6),so

mandapplythebrakes.

rokeofthe brakechamberpushrod

akemustbe adjusted(seeBrakeMinor

ushrodstrokewithin thecorrectlimits.

epermittedto exceed1%"andwhenthe

rokeshouldbeas shortaspossiblewithout

minimumstrokeisusuallyabout 3/4".

amber,slackadjustershouldbeso ad-

(6)tolineup withbrakelever.Donot

hinonrod (6)toalignwith brakearm


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ningslack adjusteradjustingnut.

etubingfromchamber.

keysandnuts fromchamberstuds.

andclevis pinfrompushrod,and lift

brackets.

mentofchamberisin reverseofremoval.

eport inchamberisup,and drainportis

PHRAGM.a.Chamberdiaphragm

erytwoyears.

eaksinthebrakediaphragm. (1)

aphragmwithsoapywater.

soapywater,a 3-inchbubbleinthree

tightentheboltsuniformlyaroundthe

ears.Nevertightenthe boltstothepoint

hragmstarts tobulge,inasmuchasthis

ragm.

ective,airwillescapearoundtherub-

whenthebrakesareappliedand thedia-

asfollows:

movethebrakechamberfromthetrailer

bernutswhichhold ittothe mounting

bingassemblyandpullthe clevispinatthe

viseanddrawa nailorothersharp

edgeto markitforreassembly.

acethediaphragmandtighten bolts

BER

RAKE


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bersprings,pressureplate,rods,boots.

utlinedaboveforthedisassemblyofthe

hrodand installthenewspring.Make

roperlyonpushrodplate (Figure30).

ates shouldbereplaced.

hrods maybestraightened;ifseverely

ced.

replaced.

DER-SECTIONALVIEW

gure31).a.Function.Thefunc-

toconverttheenergyofcompressedair

necessarytoexpandthebrakeshoesagainst

he brakes.Airpressurefromtherelay-

ortbehindpiston(5),airheld incheckby

piston-cupassembly,andpushrod(10)

akeleverandapplythebrakes.

akesareoperatedbyfourbrakecylin-

ntwoplates.The platesareinstalledin

kingbrakerods.

swhichrunto cylinders(Figure

atfrontandr earendofwalking


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RAKELINESATWALKINGBEAM

ngmountingplateto walkingbeam

semblytotheground(Figure33).

atehasbeenremovedthe brake

edismounted.Justremovethetwoclevis

mountingbracket(Figure34).

placementofcylinderisin reverseof

clevispinsbe sureclevispinsare

greasebeforeinstallationandseethatslide

dis wellgreased.

RAKEMOUNTINGPLATE


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YLINDERFROMMOUNTINGPLATE

(1)Itwill benecessarytoremovebrake

r leakage.

ssuretocylinders.

sudspaintaroundbolting flange,at

iner,andaroundthepushrod guide.

uldbecorrectedbydisassemblingthe

ningallparts,andreplacingthepackingcup.

. (1)Removethesixcapscrews

nplaceand pullpushrodand pistonassem-

ISASSEMBLED


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NUAL

pistonfollower,spacer,packingcap

eremovedfromcylinderhead,ifnecessary.

(1)CAUTION:(a)Whenever

rtsshouldbethoroughlycleanedandlubri-

erwallsshould.belubricatedwitha

asegrease.

nderhead(12)should beremoved

ed withagoodgradeof lightcupgrease.

semblyofcylinderisinreverseof dis-

emblingcylinderextremecareshould

ainthepackingcupis notdamagedwhen

yinthecylinder.

). (1)Brakecylinderrequiresvery

ecttoextremetemperaturesanddifficultop-

ouldbekeptcleanby periodically

hingincleaningfluid.

ndershouldbe removedfromtrailer

bled.Allpartsshouldbecleanedandanew

fnecessary.(Seeparagraph/.,Lubri-

ALVE(Figure36).a.General.

dwithtworelayvalveswhicharelocated

rearunderconstruction.Theyareboltedto

yvalvesareidenticalinconstructionand

1)The relay-emergencyvalveserves

duptheapplicationorreleaseof thetrailer

meansof automaticallyapplyingthetrailer

eaks awayfromthetractor.

ctionistooperateso astodeliverand

surein thetrailerbrakechambersasthe

deliversto it.

(1)Theoperationoftherelay-emer-

upontheairpressure deliveredtoitbythe

reis deliveredtotherelay-emergency

neandentersthe cavityabovetherubber

).Becausethiscavityissmalland, there-


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GENCYVALVE.

gesinair pressure,theactionofthevalvein

ssureisalsovery rapid.

therelay-emergencyvalveassumesthree

eration.Thesethreepositionsarcthe:

enthevalveisactuallydeliveringair

mbers.

nthevalveismaintainingorholding

brake chambers.

Whenthevalveisreducingorreleasing

rakechambers.


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NUAL

valveisso arrangedthatitcanassume

eEmergencyPosition^Themechanismonly

nsomeabnormalcondition,suchasatrailer

pintheairpressure inthetraileremergency

ns,thevalvepermitsfulltrailer reservoir

railerbrakechambers,applyingthetrailer

me,preventsloss oftrailerreservoirpressure

emergencyline.

n eachofthesepositionsisas follows:

airpressurefromthebrakevalveon

theserviceline onthetrailerandenters

vediaphragm(2),thepressuredeveloped

Thediaphragmthussealstheexhaustport

geand itscenterisdeflected,forcingthe

againstthetop ofsupplyvalve(5).Con-

hissupplyvalveoffitsseat andpermitsair

servoir,enteringport(6), toflowthrough

valve(7)andoutport(81) tothetrailer

oonastheair pressurebeingdelivered

alsthepressurebeing deliveredtotherelay-

rakevalve,thepressureaboveandbelow

andthe centerofthediaphragmliftsand

n.Thispermitsthe supplyvalvespringto

ngtheair pressurebeingdeliveredtothe

hesamepressurebeing deliveredtothe

hetractorbrake valve.Inthisposition,ac-

diaphragm(2)makesthe outeredgeof

haustport(3). Thusthevalveisin itsHold-

esameairpressure inthetrailerbrakecham-

thetractorisdeliveringtoit. Ariseinbrake

sameactionuntilthehigher pressureinthe

milarlyestablished.

thebrakevalvepressureabovedia-

trailer brakechamberpressurebelowthe

epressureabovethediaphragmandthedia-

is opensexhaustport(3)permittingthe

kechamberstoexhaustuntilalowerbalanced

brakevalve pressureontopofthe dia-

y,therelay-emergencyvalvealsoreleasesall

akechambersthusfully releasingthebrakes.

Thetraileremergencyline,connectedto

gencyvalveisdirectlyconnectedthroughthe

etractorreservoir.Anysuddendrop in

ergencylinewillcausetherelay-emergency

positionandapplythe trailerbrakes.Nor-


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ureispresentaboveandbelowtheemergency

ndrop inpressureinthe traileremergency

appedabovediaphragm(10)forcesitsouter

ntingthefurtherlossof airthroughport(9)

ine.Thispressurealso depressesthecenter

gthesealat (12)andclosingtheemergency

fromthe trailerreservoirthroughcavities

the trailerbrakechambers,applyingthe

rakesarethus appliedautomatically,due

mergencylinepressure.

onditions,itsometimeshappensthatthe

reservoirwillfallbelowtheair pressurein

differenceinpressuredevelopstoasuffi-

n howanundesiredemergencyapplication

uardagainstthis,apressureregulatingcap

y.Thevalveinthiscapnormallyremains

ureisabove70to 80pounds.Thispermits

m(10)toequalizewithpressurebelowthe

ressure isabove70to80 pounds.However,

elowthis point,thevalveinthepressure

eventinganyfurtherequalizationofpres-

ualdropin pressurebelowdiaphragm(11)

encytrailerbrakeapplication.Thusifleakage

akesystemorthe traileremergencylinebe-

ompressorandsuchleakagecausestheair

kesystemto dropbelowasafelimit,the

aticallyappliedtostop bothvehicles.

OPCOVERPLATE


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E

gms(2)and(10)shouldbe replaced

hragm(2) (Figure36):

mlyinavise,removetopcover(A)

uide ring(Figure38),removecotter

gthediaphragmto theguide.Liftoutthe

gtheprocedureoutlined-above.

takevalve(5)(Figure36):

ESSUREREGULATINGCAP


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OCK

witha pairoflongnosepliers.

39).

aphragm(13)(Figure36):

atingcap,springanddiaphragm(Figure

Liftdiaphragmanddiaphragmfollower

ace.

gtheprocedureoutlinedabove.


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NUAL

diaphragm(10).Washingstrainer(12)

verbody(Figure41).

ner(Figure42).

ure36).Insert screwdriverinto

movediaphragmlocknut (Figure43).Pull

phragm(Figure44).

aphragmin cleaningfluid.Installa

ry.

gtheprocedureoutlinedabove.

6). (a)Thecompletevalveshould

r,dismantled,thoroughlycleaned,anddia-

dbe replacedatleastonceayear.

removedandcleanedincleaningfluid

6):(a)With brakesreleased,cover

s.Leakageiscausedby supplyvalve(5)

verexhaustportwithsoap suds.Leak-

m(2)not seatingproperly.

ts(Figure36):(a)With fullpressure

onnectemergencylinebetweentractorand

dapplyautomatically.Thisfeatureshould

hosecouplingatfrontof trailerwith

age.Leakageiscausedbydiaphragm(10)

.

rgencyposition,coverexhaustportwith

essofthatevidentin testoneiscausedby

rly.

akagetestswithsoapsuds,a 3-inch

permissible.Leakagemaybecausedby dirt

diaphragms,ordiaphragmseatsandmaybe

ayalsobecausedby worndiaphragms,

phragmsshouldbereplaced.Wornvalves

imedbygrinding withBendix-Westinghouse

mpoundunlessthewearis excessive.Ifsuch

heleakage,thevalvesandvalveseatsshould

teassemblyreplacedwitharepair exchange

Whenairlinetubing becomeskinked

gedsectionandspliceinanewone, using

usesleeve-type3/8"tubeunion.


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rakes

Replacementofpackingrings.(I)

edwithrubberpackingringswhichactas

ses.Intime,usuallyabout ayear,these

andshouldbereplaced.Simplypry outthe

n newones.

plerspreventsthe entranceofforeign

tem.Theyshouldbe usedwheneverthe

UPLING

on(Figure45).Airfiltersare

frameside rails,justaheadofdrop in

ine andoneinemergencyline.Filteris

ater,andoilfrom air,therebyincreasingthe

f theemergencyrelayvalve.

stmentsarenecessary.However,filter

000miles.Drainingof filterisaccomplished

bottomof filter.Thefiltershouldbe dis-

washedincleaningfluidevery5,000miles.

onnectthelinesl eadingintothefilters.

ingfilterto bracket.

rews(1)holdingcup (2)toupper

oncup,separatingcupfrom uppersection.

(3);removecleanerseat(4)and pull

blyisinreverseof disassembly.When

esuretoinsert itinthegrooveprovidedfor,


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DISASSEMBLED

SEVALVEDISASSEMBLED

VE.a.Operation(Figure47).(1)

ntedonconvertergearframebetweenthe

eis operatedbyairpressurefromthe

hecavityabovethediaphragm.Asthe air

itforcesthe exhaustscatofthediaphragm

xhaustport,sealingtheexhaustandpermitting

brakevalvetopasstothe brakechambers.

asedtheairpressureandthe forceofthe

emovingtheexhaustseatfrom theexhaust

pressureaccumulatedinthebrakechambers

ybrakes,coverexhaustport(openonly

ds todetectleakage.Athree-inchbubble


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missible.Leakageiscausedeitherbydirt on

lveseatorbya wornexhaustvalveseat.Dirt

bycleaningtheexhaustvalveseat.However,

wornexhaustvalveseat,replaceentirevalve

vecanbedisassembledwithoutremoving

cover,removespringandlift valveassem-

nosisandRemedy.

hould

proper

manual

eproce-

ment.

ECAUSE*

e.

rcylinder.

mberor

rakeap-

ingcyl-

kadjuster.

stvalveor

ealso re-

cation.

ctornot

slackad-

velisex-

hose.

vesandre-

or hose.

orreplace

ragm.

cemanual.

eetrac-

perly.

.

withre-

gtohold.

valve,dia-(1)Cleanor replaceemergencyvalve

alvediaphragmorvalvestem,


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ECAUSE

sorrods.

aking.

hub.

ever.

n levers.

vispins.

pleteoff

ods.

n.

se,not

thenthe

coup-


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er,orfifthwheel,ismountedonthecon-

sedtocoupletrailerandconvertergearto-

MOVAL

Removetheboltsholdingbaseand

plate.Liftthecouplerassemblyoffconverter

lacementofcouplerisinreverseof

placementcouplerinuse,spreada

heembossedportionof couplerandworka

ok.

TINGPLAYINHOOK(Figure49).

omesworn,thecouplerwilldevelopan

motion.Thefollowingrepairsmaybemade

onvertergear.

upleriseasilyremoved,werecommend

ndturnedupsidedown,whenperformingthe

moval:1.Removecotterpins

outtotheunlockedposition.

ews(14)andlift hookhandleguide

dremoveeyebolt (1).


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PLODED

6)offbolts(10) andliftthehook(7)

9):1.Placealightfilm ofgrease

ers(29),and onthesurfaceofhookplate.

hookpin(17).

kpin (17).

overbolts(10).

erhookpin (17)withtheembossed

etwonuts (11)onthebolts (10).

ohookhandle(7).

betweentheeyeboltinhookhandle

pscrew(23).

onofhook.Itshouldmovefreely

ay.If thehookmovestoofreelyandthere


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oupler

veashim(25and26). Ifhookbindsadda

10).Afterproperadjustmentcontinuethe

throughpin(17).

, placeguideplate(13)in position,

capscrews(14).

khandle(Figure49).1.Whenper-

onnectconvertergearfromtrailer.

andle(16)byremovingthe drivepin

hreadedlockstem(6).

7).

overplate(22).

edposition.

ock(6)andtapthe endofthehook

ndlockspring(28) willcomeout.

eslantedorbeveledpartof thelock

okhandle.

gnosisandRemedy.


couplerandtrailer.

n worn(1)Replace,

ace.

lerbase.

dgouged.(1)Checkuppercouplerfor burrsin

ouging.

e.

rnuts.(1) Checknuts(11and31),tighten

tenmountings.

ymaybeencounteredwhenuncoupling.Thisisno

sof thecoupler.Thetroubleliesin thefactthatthe

onthehook.Thisis causedbythetrailerandtractor

blewithoutactuallybeinguncoupled.Allthatisneces-

ultyisto applyalightpullby handonthehookhandle


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EXPLODED

R(Figure50).a.Newdrawbarbush-

yreamedtothe properdiameterand

eplacingthenew bushingnottoburror

tallation.

H)fromthegear attheframebrackets

rpins andcastlenuts(8)fromthe hinge

hingebolts(7)witha heavyhammerand

g(ID) byskimmingdownoneside

thanacetylenecuttingtorch,usingcare

Bushingcanthenbedrivenout with

pressedout onarborpress.

putthenewbushinginto position.

ng(ID). Iftheboltwill notgoin,

50).a.Thisoperationcanbe

arattachedtothegearframe.

ftheseven5/8"rivets(1A),using

sledgehammertofree theeye(1C)


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not attempttodrivetheoldrivets out

ntopositionwithtwobolu.

ethetwo boltsanddrivetheremainder.

ide ofdrawbar.

RINGSAFETYCHAINS(Figure

eheldto thefrontcrossmemberwitheye

weldfrominner sideofeyeboltwith an

completesafetychaincanbereplaced.

edand bentbacktotheirnaturalshape.

cuttingthelink nexttothehookandby

.Anypartofthechaincan bespliced,or

useofcold shutlinks.Whenevercold

penendsshouldbeclampedtogetherand

RFRAMEBRACKETS(Figure50).

tothe framecrossmemberusingthree

ceand inserthingebolts(7),leaving

hbracket(12).Removethedrawbar

.By followingtheseinstructionsallpos-

r(1H)not fittingthebrackets(12)is

INGHINGEBRACKETS. a.Cut

ebrackets(1E-1F).

bracket(1E-1FRightandLeft)to

7/16"bolts.

amebrackets(12 and13).

veboltsami finishdriving.

ramebrackets(12)andweld.Byfol-

onsyoueliminateallpossiblechanceofthe

mebrackets(12and 13).

agnosisandRemedy.


elingatmaximumspeed.

(1)Rebush.


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69/159


70/159

LIGHTS(1)BLACKOUT(2)STANDARD

ervicingprocedureonbothstandard

koutclearancelampsisidentical(Figure53).

rnthetwoscrewsholdingl enshous-

artersofthe wayoutandlifthousingoff.

clipsfromlensandlift lensoutot

ofblackoutlenscanbeverifiedby

dthearrowpointingdown.

rnthetwoscrewsholding lenshous-

artersofthe wayout.

movebulb.

ng,besurefelt gasketisputbackin

y.

bly. (1)Removelenshousing.


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ectricalSystem,Lights

oldinglamp toframe.

cedwireandcutwire leavingitas

soldered.If,whenreplacinglamp,

cethe twowiresbytwistingthemtogether

a.Electricalsystemoftowingvehicle

smanual.Sourceofcurrentwillthere-

gat thejumpercablesocketatrearof tow-

ocatingtroublestartatthis socket.The

entroubleshootingistheeliminationofone

afteranotheruntilthe troublehasbeen

lightswitchtothe"on"position.

"applied"position.Withtheuseofa

test light,testeachlightbladein socketat

umingthatthereis aflowofcurrentin each

rcableinto thesocket.Testtheflowof

of jumpercable.Ifcurrentflowsthrough

atejumpercableis ingoodcondition.

esocketandtest eachterminalonthe

toflowthruany oftheterminalsthiswill

nginthesocket,or thatparticularterminal

wsthru thesocketitindicatessocketisin

tomakesimilarteststhroughouttheunit

as beenlocated.

nosisandRemedy.

ECAUSEPROBABLEREMEDY.

er lampslight.

eplace.

cuit.(2)Checkconnectionsbacktoswitch.

ed.(3) Checkandreplaceifnecessary.

y(4) Makesurelampterminalsengage

sfirmly.

y(1) Pushbulbfullyintosocket,

ketor(3)Checksocket,circuitandinsula-

ace.

orinter-(1) Checkwiresandinsulation;re-

ace.


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TENANCEMANUAL

exceptionallyruggeddesignofthe

verylittleattentionisrequiredto maintain

er,trailerswhichhavebeeninacollision,

r naturemayhavebentortwistedcross-

eattention.

FRAMEMEMBERS.Framemem-

hroughtheuse ofaheavyI-beam,jacks

t isrecommendedprovidedthemetalisnot

tonlyto adullred.Extremeheatweakens

ticsoftheframemembers.

MBERS.Severelybentandtwisted

tandreplaced.

FAMEMBER.a.Cutacrossthe

ctionata 30degreeangle,insertthesplice

uttingata 30degreeangle,thecutand

greater area.Theresultisa stronger

withaplateorchannelreinforce-

neachsideof thejointontheinner side

diameterholeineveryfoursquareinches

orchannel.Theseholesaretobe usedfor

ectionsplicesandreinforcementsshould

disrecommendedforallframe repairs.

oleshouldbe weldedsolidwithbare

nderofthe weldinguseacoatedrod.

re54).a.NOTE:Whenreplac-

aryspring bracketsdisconnectconverter

nger.Removalprocedureforrear

o thatoffrontspringhangerexceptthat

eremoved.

Figure54). (1)Removeouterand

With wheelsremovedthehangerismuch

peciallywhenrivetsarebeingdriven.

titon threehorses,twoatrearlength-

swiseofframe.

tfront endonly(Figure54).

anddriveupperandlower shackle

igure55).

ameandaxleto holdweightofthe


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SHMORtTAINfR

>"BUSHING

RINGHANGER

inganacetylenetorch,witha No.

douterheadsoffrivets.

o driverivetsoutwitha punch;

ningportion,thuscleaningthe hole.

eholesusinga 3/8"longtapered

ramewithahammer.

einterchangeablefromrighttoleft.

tand lefthandandarenot interchange-

ecktomakecertainhangerismounted

(Figure1).

Bolt thereplacementhangerinto

olts.Placeonebolt inthecenterof

twoin thesecondholefromthetop at

thesebolts uptight,andchecktomake

tightagainstframe.

es witha17/32"taperedreamer.


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TAINER

SROD

ACKLEANDPINASSEMBLY

Whendrivingrivetsdrivethe

eris notavailablereamholesto

nd lockwashers.

sshouldbe usedastheycanbe prop-

rand buckingbars.Lengthofrivetto

ionoroversizeof theholetobe usedand

veted.Conditionofthe rivetingjackisalso

ock,projectingpastthesurfaceofthe

entonall1/2"rivets.Asstated before,the

entfora properhead.However,ifacollar

tis beingdriven,thisindicatesthatthe

iningrivetsshouldbeshortenedby1/8"

s notfullanddown,it istooshortand

e remaindertobedriven.

ngesinlengthof rivetsinspectthe

uckinghas beendoneproperly.Seethat

nd.

hangerhasbeenr eplacedcheckaxle

paragraph1.


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o.Thepintlehookisboltedtoa

ailer. Byremovingthenutandwasher

assemblycan-bepulledouto sleevesand

nthe boxsection.

7).a.Placeshaftendofhook(1)

fromlatchanddriveout latchpin(7).

andnut(12) fromthelockbolt(9)

ASSEMBLYOFPINTLEHOOK..

procedure.


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EW

EXPLODED

cealightfilmof greaseonlatchpin,

h.Thiswillpreventrust fromformingand

chandlock.

NDSLEEVE,REMOVAL(Figure

sholdingchanneltoboxsection.

sherfromshaft ofhook.

fspring andsleeves.

NDSLEEVE,REPLACEMENT.

edure.


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Thisunitisequippedwithtwo

eandtheother fixed.Servicingandremoval

ame.

rewsfromeachendofradiusrod.

,spindlebolt,andthetwo concavere-

isttherubberbushingsoffthe spindle.

usrodswithapunchand aheavyham-

spindleoutguardagainstbending

er rubberbushingretainers.

58).o.NOTE:Oneendofradius

holein theend.Theotherendhas lock

Placeradiusrod inpositionwith,theend

anger.Theotherend,whichfits into

down.Axleendof radiusrodismorediffi-

tshouldbecoupledfirst.

tion.

rethetwo innerflatretainerwashers

chsideof radiusrod.)

R

INDLELOCKSCREW


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nspindleuntil lockscrewholein

holeinradiusrod.

hten.

ber bushingsinposition.

eretainerwashersandspindle bolts.

untilafterbothendsof radiusrodhave

areinterchangeableasallfourare

ncounteredwheninstallingrubber

ubricanttoworkbushingsintoposition.

ueezebushingsinto place.


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G(Figure59).a.Uncouplecon-

erandplacetwojacksunderaxle onthe

toremovespring.

omU-bolts.

ershackleboltnuts,anddrive upper

tin oneunit.

outshackleboltassemblykeepclear

llto ground.

blyfromoppositeendandpullspring

NG.a.Replacementofmainspring

pringmakecertainspringchairis

ndthatdowelpin isplacedinspring

boltnutsusea wrenchwithatleast3ft.

PRING.a.Placeajackunder

thesidefromwhichyouintend toremove

VAL


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nutsand pullU-boltsoutofthe spring

aryspring offtheaxleassembly.

ng. Installationofauxiliaryspringis

ththespringon twowoodhorses

nearspring centerbolt.

centerboltand driveoutthebolt

and heavyhammer.

tsand clipspacers.

cksandbreaks.Replace.

oose,heatrivetswithaheatingtorch

enhammer.

NGS. a.Whenreplacingboth

hespringsprior toinstallation itcan

ndinstallthespring withthegreatestamount

lwayskeepthespringclipboltsto the

sidewhenspringsaremounted.Thiselim-

e.

tboardasalevel,placeit acrossthe

.Measurethedistanceatthecenterbolt

ring todeterminethearch.

NDHANGERS. a.Jackupunit

nis relieved.

sandlift innershackleoffshackle

only.

acklepinsout inoneunitusinga

wear.Ifworn,reverse themwhen

rds,placethesmoothsideof eachshackle

e.Donotchangethepositionof theshackle

rsideofthespring.

yremoved.Removethetwopinch

acklepins.

bushingdriver inbushingholeand

withaheavyhammer.

verthe smallendofthebushing driver

betweentheshoulderofthebushingdriver

t asastopwhendriving,preventthe bush-

ndpreventtheendof thebushingfrom

s beeninstalled,reamto1"diameter.


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prings

epeat therebushingoperationonthe

yremovingtheshackleboltsfromonly

ngisheld firmlyinplacewhilethebnshing

andstrainis removedfromthespringclips.

ngsshouldbegivenfrequentvisual

vice.Springsshouldbecheckedimmedi-

elevel.

bedrawnup tightenoughtotakeup

tnot sotightasto preventfreeactionof

s.

ghtcheckedfrequently.LooseU-

of springbreakage.

ould alsobekepttightat alltimes.

eavesin alignmentshouldbetight,

ctfreemovementofleaves.Frequentin-

madeand theyshouldbetightenedup

pspermitleavestoshift,whichmaycause

olt.

elostsomeof theirresilienceor

toreplacethemwithnewones.Anyattempt

orarchby heating,bending,andtempering

gnosisandRemedy.


.(1)Lubricatespringshackles.

ehicleonlytoratedcapac-

n.(3)Distributeload evenly.

ingleavesdonot requirelub-

.(2) Replace.

eaves.(3)Replace.

(4)Tighten.

eases.(1)Replace.

n.(2)Distributeload evenly.


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EARSUPPORTEXPLODED


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upport*,ConverterGear

r

operlylubricatedsupportsrarelyre-

eelshouldneverbeusedexceptwhenpark-

beforeconvertergeariscoupledtothesemi-

mentsareusuallybroughtaboutthrough

xampleofthisiswhen theunitisto be

erasemi-trailer.

orkonthesupports,placethe drawbarin

drawbareyeinthepintle hookontractor

uchamanneras tooffsetthenaturalten-

ckwardswhenthesupportnolongerholds

EGS(Figure60).Removethepinin

supportleg (36).Removepinsatthe

).Thiswillpermitremovalofthe sup-

portlegsshould bereplaced.Whenslightly

WHEELANDAXLE.a.Thesup-

lyremovedbyremovingthetwoboltshold-

rtleg(36).Damagedwheelsshouldbe

you removethewheel.

GBAR.Theadjustingbars(43)are

tsanda 1"pin(26)in framesupportbrac-

vetheadjustingbardown andout.Replace

BRACKET

ONNECTINGROD


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SING

L

BRACKET

PPORTSLIDEBRACKET

ybent.Heat andstraightenifonlyslightly

PARTSFROMTHEI-BEAM(Fig-

econnectingrodfromconnectingrod

Figure62).

andonecap screwholdingconnecting

housingtogether(Figure63).

oldingthe gearhousingtotheI-beam

oldingthe rearbearingcaptotheI -

gure60)holding bracket(46)andop-

45)to frame.

shaft(31).

bracket(46)andpullcompleteassem-

rews(16)frombearing cap(15)and

gearhousing(22).

re-assembling,reversetheabovepro-

t dowel(20)isin thedowelpinholein

brassriserscrewnut(24)i soverthedowel


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MAINTENANCEMANUAL

ightgradeofchassislubricantbefore

m.

nbestraightenedwitha sledgeham-

nseverelybentoperatingshafts.

ectingrodbracketsandbearingcaps

artsofsupportsare interchangeable

er.EXCEPTION:Operatingshaftand


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upports,Semi-Trailer

operlylubricatedsupportswillrarely

sourceofdamagecomeswhentraileris un-

pportsdown,andalsowhenthevehicleis

the downposition.

pttoworkonsupport unlesstrailer

ar,tractor,orelse properlyblockedupatits

EMBLY

SEMBLY

SEMI-TRAILER

aPutsupportsin the"up"position

ckspringsat lowersectionofsup-

sectionabout12 inches.

dboltsholding jacktosupportandlift

ailure,firstdeterminewhetheror not

whole(Figure66).To dothislowerram

rewslowlyso astopreventescapeof

oraisethe leveluptofiller hole.Itis

maintainedat thecorrectlevelatalltimes.

Hein-Wernerhydraulicoilorits


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ofeveryjackwill needreplacingde-

ofworkit isputto.

etectedbyleakageofoilwhenlifting

firstremovejack'fillerscrewtoexpel

K


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tandpistonpackingnut.

pickoutpacking.

horoughly.

dinsertit withcare.

up.

(1)NOTE:Ifyourjackfailsto lift

underal oadandthehandleslowlyraises,

ning.

rst openreleasevalvetoreleasepres-

ugfrombaseof jackandwithplug

ckon benchuntilspringsandballs fallout

forforeignparticles.

ghlybutbecarefulnotto marordam-

carefully.

are rustedorcorroded.

re-assemblepumpvalvesfirstdrop

wedbysmallspring.

rgespring.

terialonplugandscrewit inchamber.

withanewone.

semblyinformation(Figure68).

KPUMPVALVE

leasevalveis dirty,jackmayfailto

ve,firstremovereleasescrewbyturning

ngwasherfromchamber.

eseatand pointofreleasescrew.(A

otharmful.)


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KRELEASESCREW

bereplaced.

easescrewavoidloosethreadsoffpack-

9)willaid inassemblingreleasescrew

rlooseram cupwillcauseyourjack

akoilaroundtheram.

easevalve,thencleanoutsideofjack

vise,removerampackingnutandtop

ylinderandpouralloil fromthejack.

dinstall anewone.

curelyandcenterpunch.

:Beforereassemblingjack,inspect

gandreplaceif scored.Becertaininside

se.

omtopnutandcylinder.

andinsertit ininsidecylinder.

ellacontopof reservoironoutside

nut severely.

utandtightento mediumpressure.

ghfillerscrewholetolevelof hole.

OTE:Abentorbrokenextension

jackhasbeenmisused.

m.

awstoavoidmarring.

nscrewwithpipewrenchto forceit

aredpin.

screwwithits lockpinfollowingthread


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ERATINGMECHANISM


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AINTENANCEMANUAL

rjackfailstoraise,it maybeair-bound.

ullramup, openreleasevalveandpush

LY(Figure65).a.Removal. (1)

onbothsidesof crossshafttoremoveleg

mhingepinand movethetopofthe

.

acementisinreverseofremdvalpro-

supportlegassembly,placealight

n andreverseremovalprocedure.

a.Removal. (1)Placesupport

tion.

handleandbracket.

rightside ofhingepin(Figure61)

gkingpinout,therear endofcon-

eground.Keepcleartopreventinjuries.

oldingdust shieldtooperatingassem-

andone capscrewfromconnecting

oldinggear housingtoI-beam(Figure

yoffI-beam.

oldingrear bearingcaptoI-beam

placementprocedureisin reverseof

gassemblytoI-beamfillgearhousing

sislubricant.

. (1)Turnriserscrewnuthousing

crews(30)holdingfront bearingcap

r screwandpullriserscrewout of

peratingshaft(2).

oriserscrew(14) andoperatingshaft

.

ydriveout thedrivepinsusing along

mer.


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upports,Stmi-TraUer

. (1)Inserttheoperatingshaft(2)

earhousing(26).

end ofoperatingshaftnexttogear

deofbearingouttowardsshaftend.)

o bearingwiththelargersurfaceto-

haftend,usingdrivepin (25).

ndofriserscrew(17) usingdrivepin

screwingearhousing.

0)overend ofriserscrewwiththe

.

the concavesurfaceoverbearing

overbearing.

gearhousing (26)usingthethree3/8"

ers(30)and(31).

12) toI-beamusingthefour 1/2"

rearbearinghousingwithconcavesur-

10)in bearingwithlargesurfaceto

owel(15) inriserscrewnuthousing

preventit fromcomingoutofhousing.

17) overdowelandscrewtheriser

hehousing(16)and nut(17).

witha lightgradeofchassisgrease.

ytobe installedonI-bcaminaccord-

eplacement,thissection.

partsonsemi-trailerareinterchange-

nvertergear.EXCEPTIONS:Operating


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ndTires

earetwotypesofwheelsusedon this

are interchangeablefromrighttoleftand

erchangeablefromreartofront orfrom

TAXLE.a.Removal.(1).Hoist

gthechainto thefrontcrossmemberofthe

ate orwoodplankunderbothdual tires

emovalofhub andwheelassemblyinone

hwheelintactis tooheavyandcannot

se.

crewsinhubcap,pullthe cotterkey

ovetheaxlenutbyturningthe nutina

n.

erundertheouter bearing,prygently

mmer.TheD-washerandbearing mayalso

ssemblyis pulledoff.

thegreasedskidplatetofacilitateits

Beforeinstallingthehubon the

ewashedin cleaningfluid,astiffbrushem-

nmatter,andbearingsthoroughlyinspected

wear.Alldirtapt togetintohubs should

eedasfollows(Figure71).

AYVIEW


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ehub betweenthetwocupswithnew

erofgreaseon theinnerandouterbearing

randouter bearings.

innerbearing,felt,or feltretainer

wheel.

ring(5) inthehub.

ring(4) withitsflangedsidetoward

ethefeltgreaseretainer(3) nexttothe

ontheaxlespindleandl ockitinto

aldowel(1) whichfitsintoaslot onthe

ustcollar.

ate,slidethewheelonthe spindle.Place

ehubandinstallthe D-washer(7).

ptight,thenslackoff about1/3turn.

y.Usea bar.Restoneendonthe floorand

orkingthebarup anddownwhileholding

theouterbearing,excessiveplayisquickly

erlyadjusted,fit cotterkey(9)into

/3fullofgreaseand reinstallwithcapscrews.

WHEELASSEMBLY


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eelfailstoturnfreely,checkforbrakedrag

sters.If thisfailstocorrectthe trouble,the

blyslippedoutof placeduringassembly.To

ovehubassemblyandreinstall.

BLY,REARAXLE(Figure72).a.

xlehubassemblyfromtheaxle,proceedas

erof trunnionaxle,andjackupuntil

ate orwoodplankunderbothdual tires

emovalofhub andwheelassemblyinone

hwheelintactis tooheavyandcannot

se.

screwinhubcap,taphub capina

ntoloosen,andturnhub capoutofhubby-

mtheaxlenutandremovethe axlenut

nter-clockwisedirection.

erundertheouter bearing,prygently

mmer.TheD-washerandbearing mayalso

ssemblyis pulledoff.

ARINNERTIREASSEMBLY


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Bearing* andTire,

thegreasedskidplatetofacilitateits

esameprocedureoutlinedin"Installing

cepthubcapscrewsintohub andisheldin

w.

LY,REARAXLE(Figure73).a.

ovinginnerwheelassembly,itisnecessary

mbliesprior toremovalofhubassembly.

fromhubcap, taphubcapwith ham-

edirection,andturn hubcapoutofhub by

outerbearing.

xlespindle.

E:Beforeinstallingth.ehubon the

washedin cleaningfluidandscrubbedwith

ldbe thoroughlyinspectedforpits,chips,

nner andoutercupsfor cracks,chipsand

togetinto hubshouldberemoved.

llfelt,feltretainer,and bearingin

naxlespindle.

re71): (a)Repackthespacein

ups withnewgrease.Putabouta1/8"

erandouterbearingcupsand repackbotli

aring(5)inthe hub.

ing (4)withitsflangedside towaid

ethefeltgreaseretainer(3) nexttothe

)onthe axlespindleandlockit into

taldowel(1)whichfitsinto aslotonthe

stcollar.Thewheelis nowreadytoslip

onspindle,usingcarenotto permitfelt

sembly.Placetheouterbearing(6)in the

er(7).

tight,thenslack offabout1/3turn.

.Usea bar.Restoneendonthe floorand

orkingthebarup anddownwhileholding

heouterbearing,excessiveplayis quickly

rlyadjusted,fit cotterkey(9)into

/3fullof greaseandreinstallhubcapand


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Ifthe wheelfailstoturnfreely,checkfor

e slackadjusters.Ifthisfailsto correctthe

nerprobablyslippedout ofplaceduring

ifficulty,removehubassemblyandreinstall.

74).a.Removal.Placeasoftsteel

roredgeofthe cuptoberemoved.Using

n onesideofthecup andthentheother.

er,thecup willcomeoutstraightwiththe

ngofthe cupintheboreis minimized.

ewheelon itsside,startthe new

o thatitssmallestinsidediameterwillbe on

ce.

oodorsoftsteelover thecup,driveit

outeredgeofthehub.

overthenewonein thesamemanner

newcupin untilitis absolutelytightwith

ethat thecupisproperlyseatedbecause

stancebetweenthebearingcentersand

eassemblyofthewheel.

thebearingcupbecomesloosein the

osecupscanbe accomplishedbyusing

ducethediameterof thebore.Simplyuse

putabout12 punchmarkspersquareinch

L


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earingsandTire,

de wallofthecupbore wherethecup

ion. (1)Bearingsandcupsshouldbe

eneverwheelsareremoved.Pittedorchipped

replaced.

NORWORN.i.Removal.(1)

heels.

xleand placeonthefloorwiththe

ud (orstuds)whichyouwishto re-

e outthebrokenorwornstud.

overandplacethenew studinposi-

oulderon thestudisplacedso thatitwill

ubafterstudis drivenintoposition.

tionusingacopperhammer.

h drumup,installlockwashcrand

heelstuds arenotinterchangeable.

nremovingwheelsfortirerepairs,

sand nutsaremarkedwiththeletters "L"

andright.And,whilenuts arenotinter-

emselvesare.Theymaybeusedasinneror

reartofront.

carriedouttothewheelsthroughthe

ntodraw upwheelnutstightand withequal

fit,followthissimpleprocedure.

nkholesin wheelsareclean,freefrom

apednutswhichholdtheinnerwheel

venlyonall nutsbyprogressivelytightening

downverytight.

elanddrawupthe outerstudnutsin

edabove.

nmountingwheelstoplacethevalve

rforeasytire inflation.

el. (1)Permittheair toescapefrom

orefromthevalvestem.Theninserta tire

orthepurposeontherim andprydown

sideof therimwithahammer.

e,inflate beforeinstallingthetireand

tionmakesurethatthe lockrimisproperly


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ENANCEMANUAL

(1)Placewheelonfloorwithvalve

th valvestempointingup.

nto bead.Drivehalfoflockring

the remainderoflockringoverwheel,

ion.

tire,checkrimtomakesure splitis

ckringis properlycoupledintorim.

APTWOSAFETYCHAINS

FFERENTPOINTSOFTHETIRE

SSAFEGUARDSAGAINSTPOSSIBLE

THEOUTERLOCKRINGLETGO

cewhenmountingwheelstoplacethe

hotherforeasytire inflation.

res andtubes. (1)NOTE:Alltires

ustainweightof theloadedtrailer.How-

edpressureismaintained,tireswillnotfunction

sequencesafe,economicaloperationoftrailer

dbecheckeddaily.Correctairpres-

0 Ibs.atfront.

kecertaineachvalvestem hasavalve

edobjects,cuts,andsignsof uneven

NGS,TIRES.ServiceDiagnosisand


(1)Adjust.

nnate.

amber.(1)Replace.

(2)Replace.

teto80I bs.pressureatfront

ar.

(1)Adjust.

Tighten.


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GEARAXLEANDWHEELPARTS

CONVERTERGEAR

2)2

2

67-5/16"tread1


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BERCONVERTERGEAR

ERTERGEAR

y(535704)2

omotiveAirBrakeCompany,Elyria,Ohio.


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DERTRAILER

ER

antity

NDER,brake,assembly(535700)4

otter,1/8"x1"4

oke,1/2"x2-1/64"4

hex,1/2"204

CER4

OWER,piston4

piston4

ON4

,spring4

NG4

D,piston4

DY,cylinder4

D,cylinder,assembly4

SHING8

T,oiler4

KE,assembly,1/2"204

,hex,cad,thin,1/2"204

LT,hex-hd,5/16"18x3/4"24

SHER,lock,5/16"24

TE,screen4

VER,breather4

seAutomotiveAirBrakeCompany,Elyria,Ohio.


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GBRAKE


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antity

ruff,1/4"x1.3/8"2

x-hd.,1/2"20x2-1/2"2

1/2"20*

ock,regn1/2"2

support2

4

ke,rear,w/BUSHING,assembly2

G,lever(usingsameasItem31A)4

onrockerbeamlever4

,1/8"x1-1/2"8

g,brake,assembly4

brake,w/brakerodBARattached,assembly4

x.,1/2"204

adjustable,rodend,1/2"4

,assembly2

adjustable,rodend2

x.,1/2"202

ke,w/104044CLEVISattached2

rodend,1/2"2

alizing,brake,w/PIN,assembly2


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KESCONVERTERGEAR


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ESTRAILER


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LER

antity

assembly4

slack,assembly4

,1/8"x1"

usting

embly

ock,1-1/8"

emite,straight,1/8":

uster(notservicedseparately)

slackadjuster24

slackadjusterfelt,large16

m8

felt,slackadjuster,large8

P,feltretainer8

ake,w/bearing,assembly(535098)8

needle,(BH-2216-X)16

mite,straight,1/8"8

t,left8

t,right8

d.,1/4"20x1/2"49

ck,medium"A,"No.14or1/4 48

assembly,16"x6"(533973)16

2

ake32

6

ler16

ervicedseparately)16

/8"16x1-1/4"128

16,128

ock,3/8"128

20xM/2"40

2016

2056

ock,medium,"A,"1/2"56

eccentricanchorpin

um,left

um,right.:*

16

ocktype"A,"3/4"

plain,3/4"

maleandfemale)16

tricanchor16

,felt8

P8

rakeshoe8

24x2-1/2"16

2416

ock,3/8"1

singisgroundoff ononesideforclearanceof alemite


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113/159

-CONVERTERGEAR

ergeartotrailer

/4"1/4

4" 1/2'

-220165)

WAB-215604)

/4"1/2"thread

-220165)

mber2

12

1/2"8

02)SeeFigure762

1/2"2


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ARTSFORBRAKESTRAILER


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TRAILER

antity

akecylinder,assemblycomplete2

e,assembly(WAB-215766)4

ionrockerbeamparkingbrake(536250)4

eservoir8

50

-off(WAB-220745)1

OR,3/8"tubing,1/4"pipethread(WAB-

OR,1/2"tubing,3/8"pipethread(WAB-

airhose(WAB-220165)3

G,dummy(WAB-220636)3

G,tubing(WAB-205465)4

,brake(WAB-220929)SeeFigure774

/8"tubing,1/4"pipethread2

xhaustattachedtobottomof valve(WAS-

tubing,7/16"insidediameter140'

G,copper,3/8"140'

tubing,9/16"insidediameter2'-3"

G,copper,1/2"2'-3"

IR,7"x36"(WAB-215689)2

nnionrockerbeamlever4

,(WAB-221022)SeeFigure842

mping(WAB-205730)3

rgency(WAB-201499)1

ce(WAB-201500)1

g(WAB-205103)3

bing1

mergencyrelay(WAB-220353)SeeFigure

x-hd.,1/2"13x1-1/4"24

ock,medium,1/2"24

x-hd.,-3/8"24x1"8

3/8"2412

ock,medium,3/8"16

d-hd.,selftappg."A,"No.10x1"50

pe,3/8"pipethread1

G,reducingpipe,1/2"x3/8"1

reducing,3/8"to1/4"1

,1/2"8

,1/8"x1"- 8

,1/8"x1-1/2"8

hd.,3/8"16x1"4

reducing,3/8"to1/4"2

-hd^3/8"24x1-1/4"4

e,3/8"4

straight,1/8"4

bottomofreservoir(WAS-


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GENCYVALVE

E

rgency,relay,assembly complete

.............2

.........2

e................2

e................2


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E

antity

Y,complete2

Y2

ING,diaphragm2

diaphragmguide.....2

KET,cover2

DE,diaphragm2

PHRAGM2

T,spring2

VER2

cotter2

EW,diaphragm2

,diaphragm2

SHER,diaphragm2

ING2

KET2

,cap2

M,valve2

ERGENCY,assembly2

DY,emergencyvalve2

LT,hex-hd2

T,valve2

SHER,lock2

PORT,diaphragm2

ING2

KET,cover2

HRAGM2

SHER2

,lock2

ING2

AINER2

APHRAGM,cover,assembly2

APHRAGM,cover,complete2

PHRAGM,cover,body2

PHRAGM2

LOWER,lower,diaphragm2

,stemlock2

M2

NG2

2

2

LOWER,upper,diaphragm2

M2

L2

T,valve2

T,upperspring2

LVE,emergency2

motiveAirBrakeCompany,Elyria,Ohio.

7.

cedin thefield,

25.

9, inclusive,

and49.

0, inclusive.


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RBRAKELINES

mplete(536108)2

motiveAirBrakeCompany,Elyria,Ohio.


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el)

FIFTHWHEEL


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el)

eel)CONVERTERGEAR

antity

4"1

/4"281

k,medium"A,"1/4"1

1/2"13x2"1

ocktype,medium"A,"1/2"1

STEM,lock,assembly1

ANDLE,assembly1

owercoupler1

ar,couplerhookstop1

plerhookplate2

edhex,5/8"182

,1/8"x1-3/4"2

uplerhookhandle1

x-hd,3/8"16x5/8"5

ock,medium"A,"3/8"5

couplerhooklock1

erhook1

,3/16"x2"1

erhookstop1

erhooklockhandle1

uplerhook1

uplerlockcoverguide1

ouplerhookspring1

plerhookstopwearblockasreq'd

ouplerhookplateasreq'd

R,couplerhookplateasreq'd

ouplerhook1

ouplerlock1

couplerhookspacer1

x-hd,1/2"20x4-1/2"8

1/2"208

ock,medium,1/2"8

8"18x44/2"2

edium,5/8"2


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Tm 5-9034 Semi-trailer 20 Ton Cpt 20

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