While you wait for answers, we may have found some information which could help you.
Click here for Belt Mower John Deere FigureMower won't stay running?
john deere js30 won't start?
i snapped off a head bolt how do i remove it?
John Deere L130 clutch problem?
john deere 120 shuts down when engage mower deck?
What would cause belt to flip on a pully ?