TM 5-9208 SEMI-TRAILER JAHN LKD 620

7/30/2019 TM 5-9208 SEMI-TRAILER JAHN LKD 620

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RAILER,

..IU.Utr.tionNot.

SA0277259

SA

SA

SA

PublicDomain,Google-digitized

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athitrust.org/access_

use#pd-google


3/157

ebruary1944

ManualandPartsCatalog,20-TonLowBed

hnModelLKD-620,ispublishedforthe informa-

ncerned.

TARYOFWAR:

luseFM21-6)


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Adjustment32

4

4

s35

5

end39

3

ear50


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ning

5

6

m56

7

dConnectors62

myCouplings65

66

hts73

s82


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7/157PublicDomain,Google-digitized

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8/157

ator'smanual,maintenancemanualand

ow-bedsemi-trailer,withdolly,built

by C.B.JahnCompany,Chicago,111.Bi

heavyunitsofmachinery.

AILER

Plate


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w-bedtrailerdesignedfor trans-

sofmachinery.Itcontainsinformation

g armschargedwithoperation,mainten-

uipment.Descriptionsofthemajorunits

planationoftheirfunctionin-relation

fthetrailer. Successivesectionscover

ristics;OperatingInstructionsandCon-

onandAdjustments;ToolsandAcces-

Storage.


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ACTERISTICS

apacity,maybeusedasafull

awnbyaheavy-dutytruck,orasa

bedrawnby atruck-tractor.Twovehi-

hemainunit ortrailerproperanda

hichthetrailerfrontendmaybe mount-

woloadingramps aresuppliedtto

adingofequipmenttobehauled.

hways,abilityof thistrailerto

ndsuponthetractiveabilityofthe tow-

er,LKD-620,aswellas theaerial

ate locatedatthefrontofthe leftmain

alloysteelbar, withspindles

ppedwithheavyduty taperedrol-

mentsofthebearingsare madethrough

ounted,oftheoscillatingtype.

dutytaperedrollerbearings,whichcanb*

tingnut,ahardenedtonguewasherand a

620asaSemi-Trailer


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Dolly

esareofadouble-anchor,two-

expandingtype.Theyhavea16^-iocfa

th.Brakeliningis ataperedblock,

ximumwear.

structionoftheDolly


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ithHubandDrumRemovedfromOneEnd.

haslackadjusteron thecamshaft

kadjusterprovidesfor360-degreead-

Actuationofthefrontaxlebrakesla

ontheaxle(figure 5),whiletherearaxle

chambers(figure7) mountedinthe

itsoperatingwheel(figure 8)at

frame,actuatescrossshaftsand

otherear axlebrakeslackadjusters.

rovidedateach sideofthegoose

amewithoutits dolly.

therearofthetrailer frame.

gidlymountedtothedolly.


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CE

itha pinwhich,wheninsertedina

ngbracket,providesameansof locking

tebackingthedolly.(See figure4.)

tprovidesa meansofoperatingthe

mofcompressedair,andin conjunction

n thevehicletowingthetrailer.Fun-

brakesystemconsistsofthe airde-

ndcontroltheflowof compressedair,

nsformtheenergyofthe compressedair

motiontoapplythebrakes.

temincludesairconnectionsat

ectedtotheairbrakesystemof the

nFullBedofTrailer,withPlatformRemoved.


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eneckoftheMainUnitFrame

verelaysthebrakingactionfromthe

esanautomaticbrakeapplicationonthe

lerbreaksawayfromthetowingve-

s5and7} transformtheenergyof

echanicalforceandmotionnecessaryto

hwheel.

5and 6),mountedonthebrake

symeansofadjustingthebrakestocompen-

essed

datthebottomofthereservoirto

ndensationwhichnormallycollects

dbedrainedat leastonceaweek.

ismountedinthe exhaustportof

vetoprotecttherelay-emergencyvalve

tor water.


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connectedintheserviceline

eadingfromthe airbrakesystemonthe

)are mountedattheserviceline

satthefront ofthetrailerto provide

ghoseconnectionsfromthetowingve-

re9),locatednearthehosecoup-

intrailerframe,are designedforat-

plingstoprevententranceofdirt whenthe

ngused.

sedwhereit isnecessarytoconnect

nts ofthetrailerwhichchangetheir

other.All hoseassembliesinclude

nectors.

gsare usedtoconnecttheair

ke systemwheretheuseofhoseis not

ease

E


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8),locatedunderthe mainunit

hehoselineconnectingthedolly air

ilerair brakesystemsothattheline

ollyis notbeingused.

offabricatedsteelconstruction,

dedtoit. Itisattachedatthe front

ngthroughbracketsonthedollyframe

drawbarhinges.Alockingdeviceis pro-

n backingthedollytothemainframe.

4)weldedtothe dollyframe,passthrough

nnectiontothe primemover.

e6-8-volttype.Thelightingsys-

ndtworedclearancelamps,twored andtwo

ombinationblackoutstopandtaillight

one combinationservicestopandtail

plocatedon theleft-handrearofthe

ure9)is locatedatthefrontof

0) suppliescurrenttothetrail-

9) onthefrontof themainunitframe.

edwithtwomainspringsandtwo

ndtype.All leavesareboltedinthe

enterbolt.Springleavesareheld in

ytwoclips rivetedtotheleaves.The

olly axlebyheat-treatedU-bolts.

efrontaxleand thedolly

y(top)andJumperCord.


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aintainfrontazlealignment.

ES

el disctype.Tiresare12.00x20,

l disctype.Tiresare9.00x20,

softhecabletype. Thetire

whereitisfixed intopositionby

ts.

raretabulatedbelow:

bar30*1-3/4"

7'

4"

oaded)...39-1/2"

)23-1/4"

0x8

0x9-10

16-1/2x6

16-1/2x6

8sq.ln.

-

uding

.

-8volt

dix-


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SANDCONTROLS

cordingtotheusualtrailer-truck

edrivermustbecomethoroughlyfamiliar

f allcontroldevicesbeforeattempting

heelislocatedontheright sideof

eframe.Turningthe wheelapplies

ecanbeused asaparkingbrake,or as

brakeswhendescendingextremelysteep

Seefigure 8.)

acouplingsocket(figure9)in

ssmemberoftheframe.AJumpercable

othetowingvehicleis atrailerac-

ure9) Islocatedonthefront

frame.It hasno"OTF"position.Itis

nor ata,standardlightposition.

y meansofacoinora screwdriver,

controlledatthetowingvehicle.

islocatedbehindthefrontcross

,whilethecarrieroperatingshaftpro-

member.(figure8).Byremovingthestud

dreleasingthecatchontheoperating

ll totheground.Thetireis raised

cablesoperatedbyturningtheoperating

renchonthe shaftnut.


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temiskeptchargedtothe same

systemofthetowingvehiclebecauseair

romthereservoironthe towingvehicle

e,throughtherelay-emergencyvalve,to

he brakes,airpressure,control-

thetowingvehicle,flowsthroughthe

mergencyvalve.Thiscausestherelay-

andpermitthesameair pressuretoflow

rtothetrailerbrakechambersapplying

ergencyvalvealwaysreactsinthisman-

air pressuretobedeliveredtothe

hebrakevalveon thetowingvehiclede-

ncyvalve.Itis,therefore,possible

eairpressurein thetrailerbrake

controlthetrailer brakes.Thefar-

towingvehicleismovedtowardfully

ertheair pressuredeliveredtothe

dthemoreseverethebrake application.

breaksawayfromthetowing

encyvalvereactstopreventairpressure

escapingoutthebrokenhoseline,

openscommon!cationbetweenthetrailer

kechambers.Undertheseconditions,

reappliedautomatically.

TOITSDOLLY

wheelsofthe trailertoprevent

othat thetrailer'sfifthwheel

slowerthanthedollyfifth wheel.

itslockedpositionandconnect

mover.

underthetrailer gooseneckuntil

ositioninthe dollyfifthwheel.

rlock.

ectedtotheprimemover,back

ngpinis firmlyengagedinthefifth


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steningtheminposition with

rpose.

econnectionfromits hangerat

eandconnectittothe airhosecoupling

emainunitframe(figure 8);openthe

OTOWINGVEHICLE

thedrawbarinapintle hookon

kitin positionbymeansofthepin pro-

he drawbarsafetychainstoeyes

nthe rearofthetowingvehicle.

ebetweenthetrailerand towing

thesocketat thefrontofthetrailer

n thesocketprovidedattherearof the

uplingsfromthehosecouplingsonthe

nesbetweenthetowingvehicleandthe

that theservicelineonthe towing

eservicelineon thetrailer,andthat

towingvehicleis connectedtotheemer-

entificationtagsare mountedonall

nscanbeeasilyidentified.

ntheoutlets onthetowing

eopenwhenthehandleisat aright

outcockspermitthe airbrakesystem

d,makingthetrailerbrakesreadyto

hebrakes,beforethe vehiclesare

eapplicationandobservingthatthetrailer

roperly.

kebyreleasingits ratchetcatch

omthetrailerrear wheels.

TOTRUCK-TRACiOR

wheelsofthe trailertoprevent


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othat thetrailer'sfifthwheel

eslowerthanthetruck-tractor'sfifth

arefullyunderthetrailergoose-

n isengagedinthetractor's fifth

steningtheminidle position

orthatpurpose.

leandtheair systemhoselinesand

ureoutlinedinparagraphsthreethrough

TrailertoTowingVehicle,"page20-

EANDTRAILER

mbinationis driveninmuchthe

httruck.Whenturningcorners,it should

earwheelsturn "inside"theturningradius

trailerbrakesbeforetraveling

nthedashgaugeshouldnot beless

brakeapplication.

trailerlights.

LEANDTRAILER

hiclebrakesshould beappliedin

rakesshouldnotbeexpectedtocarry

erandtowingvehicle,orrapidlining

e trailerbrakeswilloccur.

appliedeasily andreleasedwhen

eis notoperatingwithmaximumeffi-

ciency,keepthetiresjust shortofthe

edforaconsiderableperiod,set

ERFROMITSDOLLY

arkingbrake.

the trailer.

positionto supportthemainunit

sufficientlytotakesomeof theweight


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elowthegooseneckofthemain

thedollyair hoseconnectionfromit;

gonthe hangerprovidedattherearof

ablefromthetowingvehicle.

ks- ServiceandEmergency-at

s atthefrontof thetrailer.

couplingsfromdraggingin thedirt.

ecouplerstothe emergencyandser-

hesedummycouplersshouldbeinplace

tin usetoprevententranceoffor-

gsystem.

trailershouldautoma-

the trailer,but

parkedwhenthere

uldtheairpressure

ase.Theparking

wheelsblockedto

oving.

kholdingthe mainunitkingpin.

carefullypullthe dollyfromunder

MTOWINGVEHICLE

tdoesnotmoveoverthe ground

otonits axle.

etych&insfromthetowingvehicle.

reyefromthepintlehookon the

headuntil thetwounitsaresep-

ERFROMTRUCK-TRACTOR

arkingbrake.

eels.

nositionto supportthemainunit


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sufficientlytotakesomeof theweight

ableandtheair linesasinstruc-

ugheight under"UncouplingFullTrailer

heellockholdingthe trailer

til thetwounitsareseparated.

ERAUTOMATICOPERATION

beenautomaticallyappliedbydis-

mthetowingvehicle,andit isnecessary

outagainconnectingthetrailerto the

airpressurefromthe trailerairbrake

oirdraincock.

ONDITIONS

st

kroughmud,water,sand,anddust,

ewheelbearings,brakes,andair brake

Refertosection4,page24,for routine

eather

nextremeheat orcoldweathertrail-

utlined insection4,page24.


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NANDADJUSTMENT

ticallyinspectedatregularinter-

efficiency.

akeis released,andthattheser-

sesareproperlyconnected.

es,and examineforcasingin-

bleis connectedtothesocketson

wingvehicle;checkoperationoflights

outpositions.

dequipmentareingoodorder.

e onthedrawbarisproperlyhook-

etowingvehicle.

hainsare hookedtothetowing

pinisproperlyengagedin thf

fth wheel.

ed,be suretheairbrake

rthegooseneckofthemainframeisopen.

lert todetectunusualsounds,

risticsthatindicateabnormalfunction-

circxanstancesshouldatrailerbe

oftroublehavebeenobserved.Whenin

bestoppedandthe troubleremedied.

lertodetermineits general


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pectionshouldbefollowedbypreventive

ghangersto makesurenofailure

U-bolts.

ightenanyloosestud nuts.

y cracks;weldifnecessary.

hesparewheeland tire;securea

.

the reserveairtank,openingthe

e tank.

ures 11-11A-11B)givesinformation

n,theperiod,andthetypeoflubricant.

etherwiththemethodoflubrication,is

26- 31.

n

e removedforlubrication01vsftieel

orwheeldisassemblyisdiscussedonpage

ed,cleanthehubs,axlespindlesand

cleaningoroil,fuel,Diesel. Packgrease

withapaddleor thehands,andcoatspin-

Wheelbearingsshouldberepackedev-

naryconditions,andmoreoftenunder ex-

andordust.

blingthewheel,donot

ssgreasewill work

rsandenterthe

ctingbrakeaction

gs.Takecarenot

ingnuttoo tight,or

out. Tightenthe

elbinds, thenre-

nsfreely.Ordi-

nbackwardwillbe

ingnutis locked


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,

DEQF

D

T

TER

agram


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,

ARING

Diagram,


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,

WB5000

-..

~

LEBEARING

RBEARING

BEARINGS

R

BEARING

EBEARING

AXLES

ram,


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eapplyingthe

drycleaning,

usedto

ofgasoline

ted.Allparts

rerelubrica-

sisparts500

elbearings

onths,which-

sindicated

extreme

water,mud,

t,lubricate

Locatedonleft

00miles

wash.

edundermain

beforeop-

ockanddrain

y500miles

withOE.

LUBRICA-

adiusRod


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EARING,FRONT

y

eGunFitting


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BEARING,FRONT

y

TERBEARING

GAXLEBEARING

EARING,REAR

y

ERBEARING


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th wheelplateandthedolly

edandlubricatedevery5,000milesor

nnectingthedollyfromthe main

e onthemainunitand thetop

eelwithapprovedsolvent,andthencover

wingtheprocedureoutlinedon

ANDADJUSTMENT

esloosedrawbarbushings.Checkthe

drebushif necessary.Seepage81.

erlights.Replaceanybulbsthat

repairanywiring thatmayhavebecome

sefromconnections.Seepage74.

tomakesure excessivewearisnot

ngspringshavenot broken.

hefrontaxle.See page38.

ingclips.Replacespringsin which

Seepage 78.

ationofbrakesonthe frontand

orequalizationatslackadjusters,if

ddrumseveryfour months,orevery


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econnectionsandtightenanythat

the airfilterand.removethefil-

eaandwashin solvent,drycleaning,or

r wornbushings.Rebushifneces-

ghtenif necessary.

dcheckbearingadjustment;adjustif

andadjustthewheelbearingsevery

0miles.Seepage25.


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S

ththetrailerare showninfigure

toolcompartmentinthegooseneckof

pliedwiththe trailer.Thereisan

ear ofthetrailer(figure18) into

dwhenloadingor unloading.

dingchains(figure14) aresup-


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psinPosition.

dinthetoolcompartmentwhennotin

on bothends(figure10)is supplied

ircuitto thetowingvehicle.It

sonthefront ofthetrailerandthe

s

re10)aresuppliedto connectthe

vehicle.

elismountedin thetirecarrier

Chain.


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E

tiveTechnicalManualTM5-9711,

onofCorpsofEngineersEquipmentfor

neerFieldMaintenanceOffice,P.0.

o,shouldbefollowedinpreparingtrailers

TentativeTechnicalManualTM5-

psofEngineersEquipmentforStorage,"

FieldMaintenanceOffice,P.0.Box1679,

efollowedinpreparingtrailersforstor-

entativeSupplementTM5-9004,"In-

ofCorpsofEngineersEquipmentforEx-

erFieldMaintenanceOffice,P.0.Box

ouldbefollowedinpreparingtrailersfor


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7

hasbeenpreparedtoinstructrepair

sofdisassembly,repairandreassembly

er.Sectionsdealwithvariouscompon-

irsare mostlikelytobeneeded,and

sandHubs;BrakeAdjustmentandHelining;

alSystemandLights,andTrailerFrame.


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mustbeata rightangletothe

mes.Axlemisalignmentisindica-

djustableradiusrods havebeenprovided

ment,removetheinnerand outer

lies.(Seepage 46.)

ewsattachinghubcapsateachendof

aps.

rkin thecenterofthedrawbar,

e.

rriageofDolly.


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surethedistancefromthecenter

rtothe outerendoftheaxle spindleon

mentisidentical,the axleisinalign-

wbarmustbetight to

ofaxlealignment.

cedureisgivenonpage81

ealignmentisnecessary,remove

asherfromthefrontendofthe radiusrod.

astellatednutandbolt holding

e15) tothespringhanger;slip out

gs,releasingthe swivelfromthehanger.

rmandremovetheswivelbracket.

washers,asrequired,betweenthe

acket.

,reversingremovalprocedure.

rytoadjust more

ainaxlealignment.

efixedandrequirenoalignment

ORBEND

wheelsofthe trailertoorevent

neachsideof themainunitframe

frontendofthe traileruntilthedolly

und.

nderthemainunit

intheeventthe

hubassemblies.(Seepage49.)

positiononthefrontside ofthe


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tAxleforBend

endofthe gaugefirmlyagainst

tone endoftheaxle,andadjust the

end ofthegaugeuntilthey contactthe

face.(Seefigure16.)

havebeen adjustedatthefrontof

overto therearofthe axle.Ifeither

ontactitsbearingsurface,a"oentaxle

eterminetheamountofbend,and

inexcessof.002".

onesnindlerevealsnobendin

d forendandchecktheotherspindle

ttingoftheorongs.

anceateitherbearingsurface,

andreplacetheaxle iftheclearanceis

ntactatboth-ooints,

wheelsofthe trailertoorevent

neachsideof themainunitframe,

frontendofthe traileruntilthedolly

underthemainunit

in theeventthe

othefrontaxle braKechambers.


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kabovethetirecarrier shaftoperating

e.(Seefigure3.)

nesfrom thefrontDrakecham-

nerwheelswith theirtires.(See

umsas assemblies.(Seepage49.)

d(figure15) atitsaxleend by

erpin,castellatednutandboltthat

weldedtotheaxle.

ckingor awoodhorseandremove

fourU-bolts,releasingthelowertie

omunderthedolly, usingawood

eadboltsattachingthedustshields

movethedustshields.

refromtheanchorpinretainer

erscrews.

movea lockwirefromeachbrake

;driveout theanchorpins,takingcare

nglinkingthe twobrakeshoesat

heshoes.

hBrakeShoesinPosition


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hBrakeShoesRemoved

hamberpushrodfromtheslackad-

soin.

mbersfromtheiraxlemountingbrack-

sandcastellatednuts.

mbermountingbracketsbyremoving

to theaxle.

meachslackadjusterretainerwasher

eretainerwashers;taptheslackad-

camshaft.

right-handcamshaftassembliesso

eassembly.

tsfromboltsattachingeachspider

hBrakeChambersandSlackAdjustersRemoved


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thespidersandcamshaftsfromthe

sandreplaceifdam-

llthefrontaxle,reversethe dis-

ART

n diagnosingtroublecausedbya

mainunitframewith ajack.

wheels,ortherear

ethe onebeingser-

omshifting,and

metoprotectagainst


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nerwheelswith theirtires.(See

umsas assemblies.(Seepage49.)

ds(figure20}at slackadjusters

onbracketsbyremovingcotterpinsand

evispins.

xletosupportitafter thebrack-

ourbolts attachingeachofthe

ailerframe,transferringtheweightof

rombeneaththe trailerframeand

ts.

-handcamshaftassembliessothey

embly.

ngfrombetweenthe slackadjuster

ecamand shaft.Pullthecamand

easingtheslackadjuster.

eadboltsattachingthedustshields

movethedustshields.

refromtheanchorpinretainer

erscrews.

movea lockwirefromeachbrake

he anchorpine,takingcarenottodam-

nglinkingthe twobrakeshoesat

heshoes.

hOuterHubandDrumRemoved


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tsfromboltsattachingeach spider

thespidersfromthe axle.

sandreplaceif damaged.

OA

ethetrunnionaxle,reversethe dis-

cedure.

ountingbracketsover

axle bearingsuf-

ease.

mgl).I

arAxleandBrakeParts


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S

thefrontordollyaxle andon.

areremovedinthesamemanner.

elsareto beremoved

isadvisableto

framefirst. Os-

removalofwheels

xledifficultifun-

thewheelsfromthe

ssufficienttocleartheground,

s ofthemainunitframe andjackup

withitsdolly.Blockthedolly to

kingpin.

wheelsofthetrailer

eunit.Placeblock-

OuterWheelinPlace


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hOuterWheelRemoved

mainunitframeto

eventofJackfail-

ssufficienttocleartheground,

rnishedwiththetrailerunder thetrun-

tobeservicedandraisethe rearendof

siterearwheelsofthe

s attachedto

e trailerfrom

dertherearendof

againstinjuryin

dertires ofthewheeltobe re-

ndtire canbeslidfromthe axle.A

ytobeeasilyremovedwithoutuseof a

t holdtheouterwheeltohub studs

eelwiththetire.

used forwheelmount-

"to denoteright-

s.Thosemarked"L"

deofthetrailer,

ustbeusedon the


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ud nuts,releasingtheinnerwheel;

re.(Seefigure22.)

eversethedisassemblyprocedure.

d nutsaretight-

rwheelin position

erwheelin place.

ntheinner wheelcap

eelas anassemblyfromthehub.

hevalvestemto permittheairto

okingring, nexttothesplit

ewheel.

singandinflateslightly.Place

ositiontoprotectthetubefromeon-

floororgroundwiththe valveslot

wheelwiththevalveup.

nthewheelina clockwisedirec-

ewheel.

kingringto makesureth*yare

hetire.

gthetire,wraptwo

ndtwodifferent

eltosafeguarda-

kingring letgo


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andwheel,as anassembly,onthe

S

ws,withtheirlockwashers,that

b;slipoff thecap,talcingcarenotto

itfallintothe dirt.

ckingthecastellatednut.

nchfurnishedwiththetrailerto

stellatednut.

ssemblyoutwardsharplytostart

ndle. Pushthehubanddrumbackon

ovethebearingbyhand.

massembly.

ingermaybeseparatedreadilyby

mtheten hubanddrumstudswithinthe

e removedbyremovingsixcapscrews

inthe drum.Removalofthedustcol-

ng.

ws,withtheirlockwashers,that

b;slipoff thecap,takingcarenotto

itfallintothe dirt.

bandDrumAssembly


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AL

nchfurnishedwiththetrailerto

erspindlenut.(See figure23.)

herbetweentheouternutandthe

innernut.

nchtoremovetheinnernutfrom

ssemblyoutwardsharplytostart

ndle. Pushthehubanddrumbackon

ovethebearingbyhand.

massembly.

g,takingcaretoprotectit from

nger maybeseparatedreadilyby

mtheten hubanddrumstudswithinthe

sandreplaceifdam-

ear

yin asuitablecleaningsolvent.

placeanythatarewornor dam-

wheelbearing grease,WB-1,ina

xleinthe spacebetweentheinnerand

mandhubon theaxle,reversing

ng.

ntilthedrumcannotbe rotated

aduallyuntilthedrumrotatesfreely.

acotterpin.

theinneror bearingadjusting

nuntilthedrumcannotberotated by

allyuntil thedrumrotatesfreely.Slip

e spindleoverthenut,andlockin place


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DRELINING

NT

andrear brakesisidentical.

urn theadjustingnutofthe

elclockwiseuntilthewheelcannotbe

fftwo notchesormoresothatno

um.

drumpermitvisual inspectionof

houtremovingthewheelsfromthe axle.

adilytodetermineextentoflining wear,

airingbrakeefficiency.

ry,thefour brakeblocksofa

eplaced.

eelassemblies.(Seepage46.)

nddrumassembly.(Seepage49.)

keShoes


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wingBrakeShoeRemoval

withlockwashersthatattachthe

derand takeofftheshield.(Seefigure

s:

efromtheanchorpinretainer

erscrews.

ovethe lockwirefromeach.

brakeshoeretractingspring

s, takingcarenottodamage

sfromthespider.(See figure

omthe shoesandinstallnewlin-

.openvise andusealong

odriveoutthebrakelining rivets,re-

lineorotherapprovedsolvent,

buffingwheel.

enewlining totheshoe,mak-

dsothatholes initand intheshoe

ngmachinetoinstallfiverivets.He-


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55/157

lltheremainingrivets,

achineis notavail-

tfirmlyin avise,

useitasa bucking

tswith asmallball

hoes,r eversethedisassembly

nddrumas anassembly.(Seepage

heelsas units.(Seepage48.)

BrakeShoeRemoved.


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57/157

CE

000miles.

amberpushrodsand adjust

odtravelshouldtoekept atthemini-

ging.

rningtheadjusting

slackadjusterwormshaft.Allslackad-

ctiontypelockarrangementsothead-

ocked.

dmakethe adjustmentas

hebrakes,dragging.

tandwiththe brakesap-

mandthe brakechamberpushrodshould

than90degrees,andallslackadjus-

eatthis sameangle.

drainair linefilters.

iesforabrasions,swelling

ifnecessary.

gasketsforabrasions,

Beplaceifnecessary.

serviceability.

er 6,000miles.

linefiltersand inspectcon-

replaceif necessary.

ndlubricateallslackadjusters

ngagreasegun.Oneor twoshots

greaseguntoolong,

hegreasemaydis-

enbreaktherivets

offthe slackad-


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AL

ngs fordamage.Itis

ecollapsedor dentedatanypointas

randaffectstheoperationofthe air

ealldamagedtubingortubingfittings.

esintheair brakesystem

LITY

tem.(Seefigure27.)

akesystemto theairbrake

le.(Seepage20-)Start theengine,if

airbrakesystemsto100 pounds,asreg-

on thetowingvehicle.

dand thebrakesre-

dropin airpressureregisteredbythe

vehicle.Therate ofdropinair pres-

eepoundsper minute.

edand brakesfullyap-

rop inairpressureregisteredby the

op inairpressureshouldnot exceed

abovetestsisthe

rbrakesystemonthe towingvehicleand

trailer.Leakageinthetrailerair

edbycomparingtheleakageinthe above

din similartestswiththecut-out

nectingthetowingvehicleto thetrail-

heabovetestsis ex-

andconnectionsforleakage,andrepair

ceorconnection.

ng,applythebrakesand

.Checkforquickbrakingresponseonall

andreleaseofthebrakes.

ed,closethecut-out

eatthe rearofthetowingvehicle.Dis-

linefromthetrailer.Checktobesure all

aticallywithoutanynoticeableleakage

ecouplingatthe frontofthetrailer,or

alve.


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encyhoselineandopenthe

ockattherearofthe towingvehicle.The

seautomatically.

stopassanyof the

eckallunitsforserviceability.

e.(Seefigure28.)

emcharged,applythe

eall brakesapplyproperly.

ecktobesure airpres-

yfromtheexhaustport oftherelay-emer-

exhaustcheckvalve.

ofRelayEmergencyValve.


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ed,coattheexhaustport

ewithsoapsudsto determineleakage.

pplied,coattheexhaust

ermineleakage.

ncyvalveinitsemergency

portofthe relay-emergencyvalvewith

kage.

aboveteatsshouldnot

bubbleinthreeseconds.Ifexcessive

-emergencyvalveshouldbereplaced.

gure29.)

bservethat thebrake

outpromptlywithoutbinding.

observethatthe brake

totheir releasepositionpromptlywithout

ofBrakeChamber.


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ofSlackAdjuster.

d,andwhile,holding the

heboltingflangeswithsoap sudsto

kageispermissible.Ifleakageis

olts.Allflang* boltsmustbetighten-

ntlytopreventleakage;otherwisethe

dandprematurefailurewill result.

pplied,checkforleak-

mbycoatingtheclearanceholearoundthe

esinthenon-pressureplatewith soap

sible.Ifleakageis found,thedia-

velwillcausepremature

erdiaphragm.Whendiaphragmsarere-

easespringsshouldalsobecheckedandre-

portantwhenreplacingbrakechamber

esametypeofspring astheonere-

nbrakingwillresult.

re30.)

e51) andnotebrake

henbrakesareap-olied.Makeseveral


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aincheck:pushrodtravel.Pushrodtrav-

as itwasafteradjustment.Ifthe push

fficultyis experiencedinkeeping

ice,theslackadjustermust bere-

pecttheconditionofthe

inersshould bewashedincleaning

eingreplaced.Cottontypestrainers

llybrushingdustor dirtofftheoutside.

coveredwithanoilyor gummyde-

be installed.Whenassemblingfilters,

.Cottonstrainers maybeusedtoreplace

ngthefilter,or re-

ndsentirelyupontheoperatingcondi-

t passingintothefilter.

,coatthe outsideof

ocheckforleakage.Noleakageisper-

oundthroughthe wallsofthefilter,

d.Ifleakageisfoundpastthegasket

ebodyofthe filter,thecovershouldbe

nstalled.

ofAirFilter.


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ofExhaustCheckValve.

Seefigure32.)

heckvalveandimmersethe

ainingthediaphragmin water.Check

ediaphragminto thecheckvalve.No

akageisfound,removethediaphragm

ndtheconditionof thediaphragmseat.

presenceofdirt,cleaningthedia-

Cock.


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ctthetrouble.Ifleakageis causedbya

diaphragmmustbereplaced.IfleakageIs

phragmseat,thecompleteexhaustcheck

33.)

emfullycharged,test

singsoap suds.Alsocheckforleakage

gtheoutsideof thedraincockwithsoap

hree-inchsoapbubble

rmissible.

bya dirtyordamaged

todirt canbecorrectedbycleaningand

upgrease tothekeybeforeassembling.

dkeyorbodycannotbe repaired,andthe

ed.

4.)

harged,coattheoutside

uds tocheckforleakage.Noleakage

geis found,thereservoirmustbere-

outsidesurfaces,for

allflashlightishelpful wheninspecting

or corrosionisfoundthatwouldweak-

voirmustbe replaced.

andHoseConnectors.(Seefigures

emReservoir.


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ofTypicalHoseAssemblies

dindicatingthatahose

removedandairmustbeblownthrough

urethepassagethrough thehoseis

anyway.

besurethehoseline

ressure,coattheoutsideofthehose

soapsudstocheckfor leakage.Noleak-

eattheconnectorsissometimescor-

onnectornut..If thisfailstocorrect

ors,hose,orboth,mustbereplaced.

silyrepairedby removing

rsandinstallinganewpieceofhose,as

ofHoseConnector.


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ofHoseCoupling.

tandpullhoseout ofthe

tempttoremoveusedsleevefromhose.

etorequiredlength,

eatrightanglesto theoutsidewallof

ofthehoseis smooth.

anairhoseto remove

nutandsleeveon the

on theinsideofthesleevepoint toward

connected.

ing.


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toverthe endofthe

ysothe sidewithremovalprotectorcov-

emovetheprotectorcoveringfromthe

in theconnectorbody,

hoseandthegasketareagainstthe bot-

onnectorbody.

isagainsttheedgeof

entheconnectornut.Itisonly neces-

ficientlytoinsureanair-tightjoint.

assembly,whereboth

nected,thehoseconnectorateitherendis

ningthenutonone oftheconnectors.The

ooseconnectorbeforetheconnectornut

mitsthe installationofthehoseas-

eingkinkedortwisted.

mmyCouplings.(Seefigures37and

sconnected,cut-out

sapplied,coatthehosecouplingsallover

ldbe noleakage.

sedbyworn,damagedor

ets.Tocorrectleakage,installanew

emovedbyprying them

stalla newgasket,be

plinginwhichthegasketfitsis thor-

eitisimpossibletoproperlyinstall a

ofTypicalTubingConnector.


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ofTypicalTubingElbow.

t,partiallycollapseit

ne sideofthegasketflangein the

enusea bluntnosescrewdriverorsome

thegasketinto place.Whenproperly

eofthegasketis flatandnottwisted

ngs.(Seefigures39 and40.)

dindicatingthatatub-

d,itmustberemovedandair blown

nstobesurethe passagethroughthe

structedinanyway.

nspectedforpartialre-

ausedbydents orkinks.Tubinghaving

placed.

emfullychargedand

binglinesand fittingswithsoapsuds

akageispermissible.leakageatthe

correctedbytighteningthetubing fit-

ecttheleakage,thetubingfitting,

If anyleakageisfoundinthe tubing,

beinstalled.

nes,alwaysbesure to


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einside andoutsidediameterasthepiece

engthwithahacksaw

ismade,makesuretheend ofthe

itiscutsquarelywith theoutsidewall.

hetubingarenot crimpedorpartially

dsof thetubing,ifnecessary.

airhosetoremoveall

veryimportant.

veonthetubingandput

erecessin thetubingfittingbody.

bottomoftherecessand

Jointagainstleakage.Itis only

utuntil sufficientpressureisplacedon

age.Alwaysuseanewsleevewhen repla-

tingnuts andtodiesmaybeusedagain

eablecondition.

Seefigure41.)

vethatiftien thebrakes

s quicklyexhaustedthroughtheexhaust

theexhaustportisnot restrictedin

ofQuickReleaseValve.


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,coatthe exhaustport

akage.Leakageinexcessofa three-

econdsis notpermissible.Ifexcessive

kreleasevalvemustbe replaced.

ure42.)

whenthehandleis ata

bodyofthecock,andclosedwhenthe han-

yofthecock.Stopsareprovidedso

edbeyondits normalopenorclosedposi-

waysbeopenedand

eshouldneverbe struckwithahammeror

nt,otherwisethecockwillbedamagedand

vingcut-outcocks,or

estothem,besureto usethewrenchon

kbeingtightened.Anyseverestrainput

duetousing thewrenchonthewrongend

ebodyandcauseleakage.

and cut-outcockclosed

ofCut-OutCock


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testforleakagepastthekey,usingsoap

gethroughthetodybycoatingthe out-

hsoapsuds.

dcut-outcockopen(hose

kforleakagethroughthebodybycoating

ockwithsoap suds.

hree-inchsoapbubble

ofthesetestsis notpermissible.

dirty orscoredkeyor

canbecorrectedbycleaningand apply-

reaseonthekeybeforeassembly.Leak-

rbodycannotberepairedand thecut-out

ystemon atraileris dependentup-

thetowingvehicleforitsair supply

ystemof thetowingvehiclemustbein

oodbrakeperformanceonthetrailer.

rbrakesystemonatrailer,alwayscheck

stemonthetowing vehicleiafunction-

twillbehelpfulia tracingdefic-

stem:


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akevalve

edposi-

Builduppressure

ngvehicle

pencut-out

onbrake

kesneedad-


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y-eiaergency

ing,

nscoveringthedis-

air,assembly,andtest

theyhavebeenre-

ivenin TM9-1827A.

referencelibraries

ompaniesandEngineer


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3

LIGHTS

donthistreiler areillustrated

cuitdiagram,figure43.This diagram

evariouscircuitsforwiringreplacement

eshownon thediagramintheirrel-

reinthe systemisofdistinctivecolor

diagram.

ludestwoamberandtwored clear-

woblue blackoutlamps,onecombination

and onecombinationservicestopand

amp.

ail

estopandtaillight andblackout

eft-bandrearofthetrailer, while

stopandblackouttaillightis atthe

outtaillampisdesignedtoproduce

atwhenonevehicleis following.another

distancethetwobeamsmergeinto a

ecessarytoinsurethis effect,the

sretainer,andthelens andfilterare

orm acompleteunit.Whenthebulb

toreplacethecompletebulbunit.(See

nstandardclearancelamosand

sisidentical.

hetwoscrews(figure44)that

elampaboutthree-quartersoftheway


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77/157

.Pusheitherofthetwo clipsfrom

tof thehousing.PlaceanewIsnsin

"'bottom"atthelowerend,and reverse

esurethefeltgasketis inpositionbe-

ndthehousing.

thetwoscrewsholdingthelens

tersofthewayoutand liftoffthehous-

oclipsfromthelensand liftthelens

etheold balbandinsertanew one.Re-

position,withthesidemarked"bot-

reassemblebyreversingthedisassembly

gasketis inpositionbetweenthe

sing.

bly,removethelens housing,the

ts holdingthelampbackingplateto

e lampandcutthesplicedwireso

ssible.Wheninstalling anewlamp,

nections.Ifsolder isnotavailable,

em securely.

ure9)is protectedagainsten-

er isnotinuse byaspringcover.

ofBlackoutStopandTailLamps.


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ofClearanceLamps.

ailerframebya flangeboltedtothe

onnections,removethesocketcap

textendingintothetoolcompartment.Tfie

ketcase"byasinglehexnut.

.

theterminalcup washer;slipoff

hewire connectionsforinspection.Be-

thedisassemblyprocedure.

e9)islocatedon thefrontcross

e.Itis operatedwithacoinora screw-

at aserviceorblackoutposition;

Theflowof currentiscontrolledon


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n diagnosinglimitingtroubles;

hecksocket,

Checkwiresand

on;re-


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AL

ame ofthistrailermakesrepairs

ormajoraccidentwhichmayresultin

bers.

ndchainsmaybeused tostraighten

vidingthedistortionis nottoosevere.

aybeheatedto adullredto facilitate

etakento preventexcessiveheatingthat

ralcharacteristicsoftheframemember.

edframemembersshouldbecut out

tionof aframemember,cut

magedsectionat a30-degreeangle,in-

edin,andweld.The30-degreeangle

greaterareaandresultin astronger

swith plateorchannelre-

boutsixinchesoneachsideofthe joint

annel.

erholeineveryfour square

channel,andplugweldatthese

oleshouldbewelded

,and coatedrod

mainderofthewelding.

dwiththe dollyconnectedordiscon-

rame.


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cted,lowerthescrewjacks

nitframeandraise thetraileruntil

sidetobe servicedjustclearthe

he othersideisalmostentirely offthe

voidaccidentinthe eventofjack

dolly fromswingingonthekingpin .

ted,jackitupsothat the

sidetobe servicedjustclearthe

edolly.

eelsas assemblies.(Seepage46.)

eaxleat theendbeingservicedto

pingwhenspringU-boltsare removed.

tsandregular nutsfromtheU-bolta

emoved,releasingthesuringtieolate

onFullBedofTrailer,withPlatformRemoved.


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AL

dandremovethemfrom thedolly.

thehelperspring.

mthespringhangers.

elocatedbetweenthehelperandthe

adboltattachingthepipespacerIn

omthedolly.

o thedollyframeafterinstalling

sassemblyprocedurebutdo notrein-

ent,followingtheprocedureout-

sas assemblies.(Seepage48-)

eplacedwiththe dollyconnectedor

inunitframe.

owingtheprocedureoutlinedunder

ge78.

ngreplaced,disconnectthertt-

efigure15.)Disconnectthedrawbar,

ethesafetychain.

r,frontor rear,fromthedolly

l weldfromtheframe.

laceandweldintoposition.

ndthe axletothedolly,reverse

utdonotreinstallthewheelsandtires.

ent,followingthe-orocedureout-


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1

sas assemblies.(Seepage48.)

dsseldomneed replacementexcept

ghtherubberbushingsattheswivelin

bronzebushingattheaxleend mayneed

, removethecotterpinandcas-

holdingtheswiveltothesoring hanger;

tand removetherubberbushingstore-

e15.)

dfromthe springseatbyremoving

tellatednutfromitsattachingbolt;

shingfrom theaxleendofthe ra-

anarborpressor driveitoutwith a

ouldbepressed intopositiononanar-

gbolt inthebushing;reamthebushing

thedisassemblyprocedure.

smustbereplacedwheneverplayin

positionthe frontaxleatvariance

railer'slineofdraft.

removethecotterpin fromthe

ndturnoffthecastellatednuts.Pull

easingthedrawbar.

veit outwitha1-1/2"or 1-7/16"

sit outonanarbor press.

tthenew bushinginposition,

mushroomitsend.

thebushing.Itshouldbe a

willnot goin,reamthebushingto

seacuttingtorchto removethe

f theIcingpin,andthe kingpinitself.


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odamagethefifth

t whencuttingout

lsmoothandplac9anewking pin

n.

ngrod toweldthekingpin in

stpass,anda 1/4"coatedrodforthe

tthe endofthehookshaftunder

rnoffthecastellatednut.(Seefigure

earof thetrailer,releasinga

esandaspring.

senthesere?/ lockingthelatch

theuintlehooklockmember.Driveout

earView.PlatformRemoved


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hFifthwheel

the hook,removethecotterpin

achingthelocktothe hook;turnoffthe

ut thebolttofreethe lock.

edisassemblyprocedure.

romthedolly framebyloosening

fromthe 14mountingbolts;liftthe

ame.(Seefigure 48.)

oltattachingthelevertothe fifth

gtheslidinglockand itsspring.

omthepin attachingthehinged

asingthehingedlockandtheplunger

thefifthwheel,reversedisassembly


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thPlatformRemoved.

isboltedtothe trailerframe

trudingthroughthe firstmainframe

hecarrier,leavingthecablehang

andtile.inwasherfronthe endofthe

romtheshaft,andslipthe shaftfrom

ndthroughthetrailer frame.

ashersfromthefour boltsholding

me,releasingthe mainmember.

eversethndisrsssT/bl;/nrccedarn.


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errear wheelbrakesareactuated

tedonthetrailerframe.Thechanbersac-

theslackadjusters areconnectedby

lso actuatedbyturningthemarking

cable,chainandrodlinkage.Anequalizer

enbral:eapolicr-tionthroughtheleft-

s.(Seefigures7,50 and51.)

ectingpartsofthebrakecontrolsys-

pinsorwireclips.Parts maybere-

adilyintheeventofaccidentor excessive

assembly,disconnecttheclevis

eequalizerbar,the slackadjuster

ers.

oldingthe crossshaftinnerand

withPlatformRemoved.


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ermittingthecrossshafttodrcnfromthe

sembly,reversedisassemblypro-

withPlatformRemoved


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dinto threesections:aPictorial

ableitemswiththegovernmentpartnumber,

quiredforeachassemblyshownon theil-

rtsListgivingtheitemsinclinedi neach

andaNumericalPartsListgivingforeach

vernmentpartnumber,name,themanufacturer

umber,thequantityusedonthetrailer,

ispictured,theunitweightand theunit

ctorialAssemblyListisinformation

onsfortrailerparts.

lied

onlyifposi-

partnum-

all

machine,

odelorsize,

mberofeach

esattached

entsandac-

partsare

nemakeor

quisition.

lespaced

otations


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SITIONS

PreparationofRequisitions

supersedingPartIII,Corpsof

}.Thetotalnumberonnand

er"OnHand".Incolumn

otal quantitypreviously

ered.Columnheaded

dto read"Quantity

ed"Approved"istoread

d"Replenishment"requisi-

Desired","DueIn",and iOn

mumorAuthorizedLevel."

ubject arecoveredin

SupplyCatalogwhich

ormerlycontainedinSection

ply Catalog.)

mplesparepartsrequisi-

whichconformstothelatest

tesgiveinstructionsforpre-

re partsforEngineerequip-

0hasnew columnhead-

vailableuse thepresent

orrectionsincolumnhead-

omenclature"and"Unit"

(eafor each;Ibforpound;

imumorAuthorizedLevel"

ationalallowancesordepot

7andENG8 oftheASF

byuseofone ofthefollowingterms:

isitionofauthorizedallowances.

sequentrequisitionstomaintainauthorizedallowances.

fornecessaryrepairsnotcoveredbyallowances.

gi-

um-

ar-

-

.Y.

s).

c-

,

en

e

odel,"

d

r.

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.


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TIONS

correctformfor submissionbythe

sshownontheoppositepage.

DINMAKING

ationofwork,PropertyOfficersmay

preparerequisitionsinfinalform,leaving

blankforcompletionbyPropertyOfficer.

WILLBEOBSERVED

REQUISITIONS

sitionforeachdifferentmachine.

upperrighthandcornerof requisition

onbyuseofoneof thefollowingterms:

tionofauthorizedallowances.

bsequentrequisitionstomaintain

nsfornecessaryrepairsnotcoveredby

nstructions.

ureofmachine,andmake,model,serial

umber.

nddate deliveryisrequired,immediately

ine.

dergroup headingsasshowninmanufac-

artsnumbersandnomenclaturedescriptions

y.Donotuseabbreviations.

ems.

sentbytelephone,telegraph,orradiomust

ediatelywithrequisitionmarked:"Con-

ata)."

mustbeaccountedfor.


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gencyVaive.16T-1649


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1B,Wasnef.2

keChamber,TypeB20T-4940

y,1

amberTypeF20T-4941


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uster20T-4900

uster20T-4901


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96/157

y16T-1549

-?16T-1564,Hose,1-

y20T-5066

kValve16T-1700


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97/157

563,Body,1

or16T-1557

Bod).1

or16T-1579

16T-1550


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543,Sleeve,1

ctor16T-1541

47,Sleeve,1

ctor16T-1545

ctor16T-1586


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99/157

47,Sleeve,2

T-1726

66,Body,1

6T-1565

6T-1588


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-15H,Jrt.1

Valve16T-1590

6T-1583

1570

0T-5067


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on

os.

yTypeE16T-1600

n

os.

yTypeE20T-5138


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sAirBrakeSystemParts


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AssemblySOT-4610

etAssembly16T-1811


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ssembly,2

73,Unil,

andBlackoutTailLampAssembly16T-1856

ssemblyI

ssembly,1

7B.Unil,1-

ServiceStopandTail'BlackoutTailLamp-Assembly16T-1857


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0

BlackoutLampAssemblies

6T-1855

1858

-1859

mpBlueBlackout16T-1860

1871and16T-1872andBlackoutSwitch16T-1888

p16T-1291


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.H.,ll^WMng,1j16T.2995,Nul,2

.H.,\r^^mjj20T-4185,RearHan(er,2

2

nstructionParts

ngRingandClamp


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mUly,1

elParts


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ControlParts


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4315,Screw,1

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TM 5-9208 SEMI-TRAILER JAHN LKD 620

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