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4 post lift repair, anyone?

Discussion in 'Technical Q&A' started by yelcab, Apr 18, 2020.

  1. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,521
    San Carlos, CA
    Full Name:
    Mitchell Le
    My 10 years old 4 post lift acted up. There are 10 pulleys, 6 of them are under one of the runner. These pulleys have a 1-inch hole in the middle for the mounting pins. One set of pulley and mounting pin have worn against each other for some time and need to be replaced. The pin is pushed into its mounting holes and then wedged in place with a small tab. There is access only from the bottom hole, the top hole is blind. I understand that the pin should be tight, but not press fit tight.

    Supposedly, the pin should come out with some persuasion. I am having some trouble with providing enough persuasion. I have already drilled, tapped, and inserted an M10 bolt for a slide hammer to persuade it out but it has not agreed to come out. It was past 6PM last night and I was paying respect to my neighbors by not banging on it too much. All bets are off at noon today (Saturday).

    Has anyone done any repairs like this with a 4 post lift? I can use some ideas.

    I have Oxy torch, MAP gas torch which I have not tried.
    I also have an air hammer (cheapy version) which I can try after I drill an access hole from the top (so that the top hole is no longer blind).
     
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  3. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,521
    San Carlos, CA
    Full Name:
    Mitchell Le
    Got it done but it was not fun.
     
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  4. taz355

    taz355 F1 Veteran
    Silver Subscribed Owner

    Feb 18, 2008
    5,394
    Indio Ca/ Alberta
    Full Name:
    Grant
    That a boy
     
  5. detailbrian

    detailbrian Rookie

    Nov 20, 2006
    23
    Charlotte NC
    Full Name:
    Brian C Brown
    Glad you got it done. I am in a similar situation currently with one of our four-post lift and have been waiting for two months on a local lift specialist to source a pulley and pin.
     
  6. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,521
    San Carlos, CA
    Full Name:
    Mitchell Le
    I buy the parts from a place in Florida. Takes about a week. They have everything.

    The long pins and pulleys at the foot of the columns are very easy to change.
    The short pins and pulleys hidden inside the ends of the runners (front to back) are exceedingly difficult because they are pressed into a blind hole. I ended up using the long bolt and socket as a puller and it came out half way and got stuck, but enough for one pulley to come out. Then I used a cut off wheel on a grinder to cut the pin in halves and it all came out. Putting the new pin in was an exercise in banging.
     
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  8. detailbrian

    detailbrian Rookie

    Nov 20, 2006
    23
    Charlotte NC
    Full Name:
    Brian C Brown
    Great, thank you.
     

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