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Thread: Floor Jack Repair

  1. #1
    Supporting Member astroracer's Avatar
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    Floor Jack Repair

    A friend of mine broke the diecast universal joint in his Craftsman floor jack. He couldn't find a replacement universal so, in looking at the broke pieces, I figured it wouldn't be that hard to make a new one out of steel.

    The pieces aren't that big. Only 3/4" in diameter. All of the parts after dis-assembly.


    I found a piece of 3/4" diameter steel in the drop pile.

    I cleaned up the OD in the lathe, faced off the ends and drilled out the bore's for the mating parts. Test fitting the parts.


    Continued in next post.

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  2. The Following 3 Users Say Thank You to astroracer For This Useful Post:

    baja (Jul 18, 2019), kbalch (Dec 14, 2015), sossol (Jul 17, 2019)

  3. #2
    Supporting Member astroracer's Avatar
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    With that done I clamped the piece in the vise on the mill and machined off both sides.


    With that done I picked up the ends and center drilled for the pin holes.

    After drilling out the pin holes I flipped the part 90 degrees in the vise and hogged out the center portion with a 1/2" end mill.


    Continued in next post.

  4. #3
    Supporting Member astroracer's Avatar
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    After some deburring and cleanup.

    I split the piece into two.

    Rounding over the cut ends and a bit of assembly and I had a new U-Joint!



    This was fun project and it will save an old jack from the scrap pile.
    Mark
    Last edited by astroracer; Dec 13, 2015 at 04:45 PM.

  5. The Following 11 Users Say Thank You to astroracer For This Useful Post:

    baja (Jul 18, 2019), C-Bag (Dec 14, 2015), DIYer (Dec 15, 2015), hansgoudzwaard (Jul 17, 2019), Jon (Dec 13, 2015), kbalch (Dec 14, 2015), NickP (Nov 13, 2017), Paul Jones (Dec 14, 2015), PJs (Dec 15, 2015), rlm98253 (Nov 12, 2017), sossol (Jul 17, 2019)

  6. #4
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    Thanks astroracer! We've added your Jack Universal Joint to our Jacks and Lifts category, as well as to your builder page: astroracer's Homemade Tools. Your receipt:


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    Very nice job! I'm sure your friend was happy!

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    That's about the size of a Proto u-joint for a ratchet wrench.



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