Hydropump pulley falling off shaft

Discussion in 'Mechanic and Repair' started by Ted D, Sep 4, 2018.

  1. Ted D

    Ted D LawnSite Member
    Messages: 7

    I have a Ferris IS 3100 Z that the drive pulley keeps falling off. Any tips on keeping it from happening.

    Installation tips?
    I think it may have something to do with how I put it back together.
    A friend of mine thinks I'm running out of threads to compress it on the shaft. There is room for 1/8" of thread space in the upper pulley when it falls off and bolts are snugged tight.

    Torque values on bolts? I have them pretty tight, by feel I'd guess close to 100 ft/lbs.


    If you haven't seen one of these, the pulley is two pieces. the inner one is pulled into the outer one by the bolts and one is tapered which compresses the inner one onto the shaft.

    Dealer didn't have any ideas.


    IMG_1615.JPG
     
  2. boats47

    boats47 LawnSite Senior Member
    Messages: 261

    wheres your key?
     
  3. Ted D

    Ted D LawnSite Member
    Messages: 7

    Key falls out when pulley does. Have spares. Learned my lesson the second time it fell off and ordered four this time.
     
  4. ricky86

    ricky86 LawnSite Silver Member
    Messages: 2,426

    There is a torque setting. Depend on bolt size. Google taper loc pulley.
    If there was no gap between the hub and the sheave, it's most likely junk now. That happens from overtightening. The key must be used.
    Tightening is a slow methodical process.
     
    Breezmeister likes this.
  5. hal

    hal LawnSite Senior Member
    from Georgia
    Messages: 654

    Shaft may have sheared smaller do to spinning pulley. The shaft may be smaller in diameter to grab pulley.
     
  6. Walker56

    Walker56 LawnSite Silver Member
    Messages: 2,019

    Last edited: Sep 4, 2018
    sjessen likes this.
  7. Ted D

    Ted D LawnSite Member
    Messages: 7

    Thanks,
    Have been using key.

    Helps to know what to google!

    Probably should said torque felt like foot/in, I way over torqued based on google. Says 55 lb/in.

    I will check for gap when attached. Hub is center piece?, correct?
    At one point I spread the gap with a screw driver to fit it back on shaft.
    But hub is very tight on sheave. I think it just doesn't pull tight enough on shaft.
    When putting together I assume hub should be flush with shaft. To do so requires light hammer pressure.

    If it is junk, do both need replacing?
     
  8. Ted D

    Ted D LawnSite Member
    Messages: 7

    Keyway sharp and unworn. Thanks for links. will review.
     
  9. Ted D

    Ted D LawnSite Member
    Messages: 7

    That would be ugly. (??????????)
    It doesn't look abused/crossed fingers.
     
  10. Walker56

    Walker56 LawnSite Silver Member
    Messages: 2,019

    Last edited: Sep 4, 2018
    sjessen likes this.

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