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
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NICALMANUAL
PartsCatalog
ARCH1943
tPrintingOffice
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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.
ECAUSEPROBABLEREMEDY
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.
ECAUSEPROBABLEREMEDY
elingatmaximumspeed.
(1)Rebush.
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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.
ECAUSEPROBABLEREMEDY
.(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
ECAUSEPROBABLEREMEDY
(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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-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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