Toro 39678 - Adjusting the Mower Belt Tension; Mower Belt Tension Adjustment

Note:Thedistancebetweenthebeltguideand
mowerbeltshouldbe32mm(1-1/4inches)
whenyouengagethemowerbelt.Adjustthe
mowerbeltasnecessary.Thedisengagedbelt
shouldnotdragorfalloffthepulleywhenthe
guidesareproperlyadjusted.
AdjustingtheMowerBelt
Tension
ServiceInterval:Aftertherst8hours—Checkthe
mowerbelttension.
Aftertherst25hours—Checkthemowerbelt
tension.
Every50hours—Checkthemowerbelttension.
Important:Adjustthebrakewheneveryouadjust
thebelttensionorbrakelinkage.
Important:Thebeltmustbetightenoughto
notslipduringheavyloads,whilecuttinggrass.
Over-tensioningthebeltreducesthelifeofthe
spindlebearing,belt,andidlerpulley.
Thebeltmustbetightenoughsothatitdoesnot
slipduringheavyloadswhilecuttinggrass,but
over-tensioningthebeltwillreducebeltandspindle
bearinglife.
1.Parkthemachineonalevelsurface,disengage
thePTO,andengagetheparkingbrake.
2.Shutofftheengine,removethekey,andwait
forallmovingpartstostopbeforeleavingthe
operatingposition.
3.Loosenthelocknutontheturnbuckle(Figure
41).
4.Adjustthetensionofthebelt.
•Rotatetheturnbuckletowardtherearofthe
machinetoincreasethetensiononthebelt.
•Rotatetheturnbuckletowardthefrontofthe
machinetodecreasethetensiononthebelt
(Figure40).
g001565
Figure40
1.Idlerpulley2.Mowerbeltwith13mm
(1/2inch)deection
Note:Theeyeboltthreadsonbothendsofthe
turnbuckleshouldbeengagedaminimumof8
mm(5/16inch).
g001566
Figure41
1.13mm(1/2inch)deection
here
4.Locknut
2.Assistarm5.Turnbuckle
3.Frontstop
5.EngagethePTOandcheckthebelttension.
Adjustthetensionuntilitiscorrect.
Note:Thepropermowerbelttensionis44to
67N∙m(10to15ft-lb)withthebeltdeected
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