Toro 74523 - Page 48

ReplacingtheHydraulicFluidand
Filters
ServiceInterval:Aftertherst50hours
Every500hours/Yearly(whichevercomes
rst)—Changethehydraulicltersandhydraulicuid.
Changethehydraulicuidmorefrequentlyinsevere
conditionsorinahotoperatingclimate.Contactyour
AuthorizedServiceDealerforahydraulickittoreplacethe
hydrauliclters.
WARNING
Hothydraulicuidcancausesevereburns.
Allowthehydraulicuidtocoolbeforeperforming
anymaintenanceonthehydraulicsystem.
1.DisengagethePTOandsettheparkingbrake.
2.Shutofftheengineandwaitforallmovingpartsto
stopbeforeleavingtheoperatingposition.
3.Removethefueltank;refertoRemovingtheFuelTank
(page36).
4.Removethehydraulic-reservoircap.
5.Locatethedrainpluginthebottomofeach
transmissionandplaceadrainpanundertheplugs
(Figure72).
Figure72
1.Drainplug
2.Hydrauliclter
6.Removethedrainplugs.
7.Allowthehydraulicuidtofullydrainfromthe
machine.
8.Removethehydraulicltercapandlterfromeach
transmission.
9.Installnewhydrauliclterswiththespringsidefacing
outandinstalltheltercaps.
10.Installthedrainplugs.
11.Loosentheventplugineachtransmissionsothatitis
looseandwobbles(Figure73).
Note:Thisallowsairtoescapethehydraulicsystem
asyouaddhydraulicuid.
Figure73
Lefttransmissionshown
1.Ventplug
12.Slowlyadduidtothehydraulictankuntilitstartsto
comeout1oftheventplugs.
Important:Usetheuidspeciedin(page)
orequivalent.Otheruidscouldcausesystem
damage.
Important:Monitorthelevelofuidinthe
hydraulictanksothatyoudonotoverllit.
13.Tightentheventplugs.
14.Installthehydraulic-tankcap.
15.Installthefueltank.
16.Starttheengineandletitrunforabout2minutesto
purgeairfromthesystem.
17.Shutofftheengineandcheckforleaks.
Note:If1orbothwheelsdonotdrive,referto
BleedingtheHydraulicSystem(page49).
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