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I had/have a similar problem with my mule drive.  The pulleys on mine are both tensioned with a threaded rod and nut, no spring.  I tried swapping out the one that's supposed to be spring tensioned, but that actually made the belt jump problem worse.  I also believe my current belt is too long (84") and that scaling back to an 82" belt when the 84" finally gives out will help the situation.  I think that time may be near, as the belt jumped on the mow before last, and when I popped it back on, I basically have no more slack to take out of the belt with my mule drive pulleys.  I have noticed also that the belt to pulley angle on the uptake side of the drive PTO pulley has to be pretty square, or the belt jumps off more frequently, meaning the mule drive departure pulley has to do more of the slack uptake work, making the belt departure angle from the PTO drive pulley more extreme, probably accelerating belt wear.

  I will say I think my mule drive pulleys are in better shape angle-wise than yours are, but my current belt situation is probably not helping anything. 


It may be way more problematic than my old plug-in electric push mower, not do quite as thorough of a job (I have a lot of obstacles that create areas my 104 just can't get to), but gawd I love mowing with my Cub... it's like having a little go-kart ride AND getting a chore done at the same time, in style!


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