A little mechanic help please! :)

Discussion in 'Mechanic and Repair' started by mtnflyguy, Sep 29, 2010.

  1. mtnflyguy

    mtnflyguy LawnSite Member
    Messages: 5

    I have an older bobcat zt100 mower. There is a gear box that has sheared off 3 of the 4 bolts. I need to be able to take this box out in order to fix it. However, for me to do that I have to remove the wheel that is attached to the shaft coming from the box. (The wheel drives one of the belts.) I have removed all the obvious points, such as allen screws and such. There is appears to be a square pin that may or may not need to be removed? (See the picture below.) Anyway, I just need to know how to remove this wheel. Thanks for you help!

  2. punt66

    punt66 LawnSite Fanatic
    Messages: 8,536

    sorry, i dont know any little mechanics
  3. clc19chase

    clc19chase LawnSite Member
    Messages: 102

    its most likely siezed on there because of rust. get something that penetrates such as wd 40 or an aerosol spray called "open and shut" and let it soak. your going to probably need a puller.
  4. lm406hp

    lm406hp LawnSite Member
    Messages: 1

    You need a gear puller, a little penetrating may help also. If that doesn't work some heat will. The keyway is there to keep the pulley from spinning on the shaft and it can stay on the shaft but it may fall out don't lose it.
  5. cgaengineer

    cgaengineer LawnSite Fanatic
    Messages: 15,778

    Use a bit of heat on the pulley and a dead blow hammer. If you hit it a few times it should break the rust free and come right off, due to the location you may actually have to pound it further on the shaft, hit the end of the exposed shaft with some emory cloth to allow the pulley to slide off.

    Do not hit the rim of the pulley, hit as close to the center as possible...you may have to use a block of wood. Once the pulley is lose you can "walk" it off the shaft.
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  6. pugs

    pugs LawnSite Gold Member
    Messages: 3,025

    Careful with a puller...that pulley will probably just bend.

    Careful with heat if you plan to reuse the gearbox. Dont want to mess up the seal or bearing behind the pulley.

    Make sure they didnt use double set screws. Sometimes they put one under the other to basically lock the first one in.
  7. puppypaws

    puppypaws LawnSite Fanatic
    Messages: 9,177

    Soak with this 48 hrs., keep it covered, use a gear puller, should come off without bending, if not no big deal, pulley is cheap.

  8. mtnflyguy

    mtnflyguy LawnSite Member
    Messages: 5

    Thanks everyone! I have been soaking in pb blaster and that hasnt done it yet, although I didnt cover it. I will try a little bit of heat and see what we can do. Thanks again!
  9. cgaengineer

    cgaengineer LawnSite Fanatic
    Messages: 15,778

    The heat will do it, you don't need much.
    Posted via Mobile Device
  10. puppypaws

    puppypaws LawnSite Fanatic
    Messages: 9,177

    I meant keep it soaked, not lay something over it. You can apply pressure with a gear puller and add a small amount of heat while someone tightens the puller, it want take much.

    Let us know how it goes?

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