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    Scottowner's Avatar
    Scottowner Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Apr 25, 2010, 04:17 AM
    M.T.D. Help desk
    The rear drive belt on my MTD ride on lawn tractor kept coming off. I bought a new OEM belt,replaced it but still have the same problem. Any thoughts. Thank you
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
    Ultra Member
    		  
    #2

    Apr 25, 2010, 11:41 AM

    Sounds like your belt guides aren't on correct.
    Also check your idler pulleys make sure they are turning freely.
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #3

    Apr 25, 2010, 06:41 PM

    Hi,
    The bolt(s) that hold the front of the transaxle to the horizontal stay are missing. The transaxle will twist and derail the belt under load. Several styles have been used from a 1/4" bolt to a pair of thread-cutting bolts.
    Peace,
    Clarke
    Scottowner's Avatar
    Scottowner Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Apr 26, 2010, 07:04 AM

    Thanyou for the help. I have the old version of the 600 Series Transmatic. There do not appear to be any bolts missing but there is only one belt guide bolt,should there be more ? All pulleys rotate freely. How much spring tension should there be on the idler pulley ?
    Thank you
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #5

    Apr 26, 2010, 09:09 AM
    Hi,
    It was not easy to find a picture with the bolt in it. Most do not have the bolt shown. In the picture it is item# 52. It is 1/4" - 28 x 1.75" with a lockwasher and not above (items 14 and 39) that fasten it. I have generally used Nyloc nuts for extra security and holding ability.
    Peace,
    Clarke
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