Install belt cover & see if that cures problem,the charger/raider series belt clutch were designed to be operated with belt cover installed,the lip on bottom of cover & tab on idler pulley bracket or inside of belt cover(I don't remember which as it's been 3 yrs since I've had my cover off)dampen/limit the flapping of upper/lower loop of belt when belt engaged or belt being engaged/disengaged.
Before installing belt cover goto link below & look at spring connection,confirm that spring on your tractor not disconnected,broken or missing,this spring maintains tension on idler pulley assembly to keep belt tight when clutch engaged(hand operated belt drive clutch,not foot operated clutch).
IF you still have problem with cover on,remove cover,drive belt & spring,check all cross shafts associated with clutch for binding/stiffness,also check bushings on same,pivot pins/pivot pin holes for wear/slop.The clutching mech shown in pic was on a charger 12 I scraped several yrs ago,as you can see by wear on lower spring arm,the clutching mech was worn & needed a complete rebuild/replacement & hydro pump/motor were weak due to wear & needed rebuild/replacement,most/all parts needed for rebuild are nla from sundstrand or toro.
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