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J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7445
Experience:  Owner of outdoor power equipment business, repairing all makes and models.
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the PTO drive belt on 20hp Z-Force 44 keeps jumping off the

Customer Question

the PTO drive belt on 20hp Z-Force 44 keeps jumping off the the idler pulley resulting in the idler arm assembly (top) bending down so that the idler pulley wears on the flat pulley of the lower idler assembly. Any clues please?
Submitted: 6 years ago.
Category: Small Engine
Expert:  J.R. replied 6 years ago.
If the belt is continually jumping off of the pulley then the belt may be worn and need to be replaced. I would also inspect the alignment of the belt to the other pulleys as well. Check all of the pulleys for excessive movement on the shafts and bolts they are mounted to also.
Customer: replied 6 years ago.
have tried a new belt - pulleys and alignment ok - mower has only done 100hrs. could it be the spring from the spring tension rod assmbly to the idler arm assembly is too weak? Can you please advise what tension should be on the spring when the idler pulley is engaging with the PTO belt?
Expert:  J.R. replied 6 years ago.
They do not list a published tension spec. A weak spring is possible, but to confirm it you would just have to replace it.