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Discussion Starter · #1 ·
I just purchased a 1988 bolens st120 hydro and am having trouble installing the new belt. I have been able to get the new belt on the machine, but can not seem to figure out how the rear idler and spring are suppose to go. Can anyone please help! I am at my wits end with this!
 

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Welcome to the forum ,Beachfan269 !
By drive belt,are you talking for the deck,or the transmission ?
Also, could you post the model,and serial number of the tractor,as MTD made many units,under Bolens name,until 1990.
 

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Transmission the belt that goes from the motor to the hydro pum
Will still need the actual model,and serial #'s .
Should be on a sticker ,under the seat,or on the frame.
 

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Found this,...might help.
Product Font Engineering Vehicle Auto part
 

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Discussion Starter · #9 ·
Thank you everyone for chiming in! My mower has a pulley near the rear hydro pump that is vertical that is suppose to push down on the belt to keep it from rubbing the belly of the tractor. Problem is, is there is no where to mount the spring to keep the tension on the Pulley. The rear hydro pulley is vertical on my tractor.
 

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From all I can see, it attaches to the pulley bolt,and then to the plate that holds the forward / reverse selector,on the trans.
 
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