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  • CareyP6 commented on Phil B's instructable Rebuilding a Hydraulic Floor Jack1 year ago
    Rebuilding a Hydraulic Floor Jack

    Good indestructible. A real big help. I wasn't able to follow your instructions exactly since I don't weld, but I devised other techniques to get the job done. Except for opening the main bottle and ram. I could not get the ram and bottle off my jack for lack of your special tool. So, thinking about the failure mode - mine wouldn't raise without some pressure on the arm, but it would lift my car and stay up - I decided that part was working OK and I would just rebuild the rest. I suspected the plunger.I got the plunger off using some high-strength spectra (no stretch) dingy racing line. I could push the plunger down with a socket and then tied the line around the body of the bottle to hold it down while I got the C clip out. Stand out of the way in case it takes off unexpectedly. Once t...

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    Good indestructible. A real big help. I wasn't able to follow your instructions exactly since I don't weld, but I devised other techniques to get the job done. Except for opening the main bottle and ram. I could not get the ram and bottle off my jack for lack of your special tool. So, thinking about the failure mode - mine wouldn't raise without some pressure on the arm, but it would lift my car and stay up - I decided that part was working OK and I would just rebuild the rest. I suspected the plunger.I got the plunger off using some high-strength spectra (no stretch) dingy racing line. I could push the plunger down with a socket and then tied the line around the body of the bottle to hold it down while I got the C clip out. Stand out of the way in case it takes off unexpectedly. Once the clip was off I covered the plunger with a heavy towel and just let things loosen until it popped off into the towel. No blood, no foul. I then unscrewed the bottom half of the plunger, whacking my new 27 mm combo wrench with a good size hammer.To reassemble I chucked the bottom part of the plunger into my lathe and used the saddle to press in on the top part until I could reattach the C clip. Then I screwed the plunger assembly back in place. I center punched the metal caps and drilled them out with a 1/2 inch drill in a variable speed battery powered drill. I could turn the drill very slowly and once through I could just pick the remaining ring of metal out of the hole with a screwdriver or whatever. Once the caps were out I cleaned out the metal chips and used my hammer style impact driver to remove the right (shallow) screw cap. It was screwed down all the way. The deeper screw cap was very loose. I think it had screwed itself out over the years.

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