Case WX148 - Hoses and tubes; O-rings

INTRODUCTION
Hosesandtubes
Alwaysreplacehosesandtubesiftheconeendorthe
endconnectionsonthehosearedamaged.
Wheninstallinganewhose,looselyconnecteachend
andmakesurethehosetakesupthecorrectpositionbe-
foretighteningtheconnections.Clampsshouldbetight-
enedsufcientlytoholdthehosewithoutcrushingandto
preventchang.
Afterhosereplacementtoamovingcomponent,check
thatthehosedoesnotfoulbymovingthecomponent
throughthecompleterangeoftravel.Besureanyhose
whichhasbeeninstalledisnotkinkedortwisted.
Hoseconnectionswhicharedamaged,dented,crushed
orleaking,restrictoilowandtheproductivityofthecom-
ponentsbeingserved.Connectorswhichshowsignsof
movementfromtheoriginalpositionhavefailedandwill
ultimatelyseparatecompletely.
Ahosewithafrayedoutersheathwillallowthewaterpen-
etration.Concealedcorrosionofthewirereinforcement
willsubsequentlyoccuralongthehoselengthwithresul-
tanthosefailure.
Ballooningofthehoseindicatesaninternalleakagedueto
structuralfailure.Thisconditionrapidlydeterioratesand
totalhosefailuresoonoccurs.
Kinked,crushed,stretchedordeformedhosesgenerally
sufferinternalstructuraldamagewhichcanresultinoil
restriction,areductioninthespeedofoperationandulti-
matehosefailure.
Free-moving,unsupportedhosesmustneverbeallowed
totoucheachotherorrelatedworkingsurfaces.This
causeschangwhichreduceshoselife.
TULI12WEX2014AA11
O-rings
ReplaceO-rings,sealringsandgasketswheneverthey
aredisassembled.
NevermixnewandoldsealsorO-rings,regardlessof
condition.AlwayslubricatenewsealringsandO-rings
withhydraulicoilbeforeinstallationtorelevantseats.
ThiswillpreventtheO-ringsfromrollingoverandtwisting
duringmountingwhichwilljeopardizesealing.
47500167A31/01/2013
10