While you wait for answers, we may have found some information which could help you.
Click here for John Deere Tension
What would cause belt to flip on a pully ?
John deere z425 54c mower want start?
Mower won't stay running?
lawn mower ?
JD lawn mower LT133 wondering if clutch switch could be bad?
john deere 120 shuts down when engage mower deck?