Case 621G - Every 2000 Hours; Cold Weather Hydraulic Oil - Change

7-MAINTENANCE
Every2000hours
Coldweatherhydraulicoil-Change
WARNING
Pressurizedhydraulicuidcanpenetratetheskinandcausesevereinjuries.
Hydraulicuidisunderextremepressure.Restthebucketorattachmentontheground.Shutthe
engineoff,turnthekeyon,andmovethehydrauliccontrolleverthroughallmovementsseveraltimes
torelieveresidualpressureinthesystem.
Failuretocomplycouldresultindeathorseriousinjury.
W0161A
Changethehydraulicoilevery2000hoursofoperationormorefrequentlywhenoperatingconditionsaresevere.
Prioroperation:
Keepallnon-authorizedpersonnelclearofthearea.Parkthemachineonarm,levelsurface,lowerbucket/attach-
menttothegroundandapplytheparkingbrake.
Servicespecications
TypeofoilCASEAKCELAHY-TRAN®ULTRACTIONSSL
621GT otalsystemcapacity147.6L(39USgal)
721GT otalsystemcapacity177.8L(47USgal)
NOTE:itisrecommendedtoreplacethehydraulicoillterwhenyoureplacethehydraulicoil.
1.Stoptheengine.Puta“DONOTOPERATE”tagonthe
steeringwheelorkeyswitch.
2.Installthetransport/servicelinkintothelockedposition.
Referto“Supportstrutandservicelink”inthismanual.
3.Releasepressureinthehydraulicsystem.Referto
“Releasingpressureinthehydraulicsystem”inthis
chapter.
4.Slowlyloosenthellercaponthehydraulicreservoirto
releaseanyresidualpressureinthereservoir.Leave
thellercaplooseduringtheprocedure.
5.Removetheremotedraincovertoaccessthehydraulic
oildrain.
LEIL17WHL1597AB1
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