Case 821G - Hoses and Tubes; O-rings

INTRODUCTION
Hosesandtubes
Alwaysreplacehosesandtubesiftheconeendorthe
endconnectionsonthehosearedamaged.
Wheninstallinganewhose,looselyconnecteachend
andmakesurethehosetakesupthecorrectpositionbe-
foretighteningtheconnections.Clampsshouldbetight-
enedsufcientlytoholdthehosewithoutcrushingandto
preventchang.
Afterreplacingahoseonamovingcomponent,checkthat
thehosedoesnotfallbymovingthecomponentthrough
thecompleterangeoftravel.Besureanyhosewhichhas
beeninstalledisnotkinkedortwisted.
Hoseconnectionswhicharedamaged,dented,crushed
orleaking,restrictoilowandtheproductivityofthecom-
ponentsbeingserved.Connectorswhichshowsignsof
movementfromtheoriginalpositionhavefailedandwill
ultimatelyseparatecompletely.
Ahosewithafrayedoutersheathwillallowwaterpenetra-
tion.Concealedcorrosionofthewirereinforcementcould
subsequentlyoccuralongthehoselengthwithresultant
hosefailure.
Ballooningofthehoseindicatesaninternalleakagedueto
structuralfailure.Thisconditionrapidlydeterioratesand
totalhosefailuresoonoccurs.
Kinked,crushed,stretchedordeformedhosesgenerally
sufferinternalstructuraldamagewhichcanresultinoil
restriction,areductioninthespeedofoperationandulti-
matehosefailure.
Free-moving,unsupportedhosesmustneverbeallowed
totoucheachotherorrelatedworkingsurfaces.This
causeschangwhichreduceshoselife.
TULI12WEX2014AA10
O-rings
ReplaceO-rings,sealringsandgasketswheneverthey
aredisassembled.
NevermixnewandoldsealsorO-rings,regardlessof
condition.AlwayslubricatenewsealringsandO-rings
withhydraulicoilbeforeinstallationtorelevantseats.
ThiswillpreventtheO-ringsfromrollingoverandtwisting
duringmountingwhichwilljeopardizesealing.
51428216_EN14/12/2017
8