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Floor Jack will not raise

Hey Chris, I have been reading your post and it sounds like you know what you are talking about. I too have a floor jack that will not pick up one wheel of my truck, but it will go up with no load. I filled it with hydraulic oil, but as far as bleeding, I am not familiar as to how to do this if that is the problem. This jack is only a couple years old at best. I just bought it from a guy hoping I could fix it. The model number is 480578. Is this something I could rebuild myself and where would I get the parts. I thank You very much in advance and hope you and your family have a safe and warm new year. My email is douglascsower@yahoo.com and I would appreciate any info you could offer,

Doug

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If the jack goes up without load, there are 1 or 2 problems.
The piston seal has become damaged
Relief valve has debris preventing it from closing.

Both items are serviceable by stripping it down.
Take notes on dis-assembly if you are not experienced in hydraulic repair.

More than likely, the piston has a cup type seal. Inspect the inner o-ring by running it through 2 pinched fingers to locate a tear, split or other damage. it should feel smooth.

Parts can be matched at a local hydraulic parts shop. ie Vickers Parker, Rexroth.

If the relief poppet is not seating, it can allow fluid to bypass the check, and you will not build up enough pressure too.

In any case, a total rebuild should be done, as it may be a combination of problems.

Strip it down as far as you can, and clean everything with a good electrical degreaser and air.

Use vaccuum grease to lubricate the seals and o-reings on re-assembly.
If you need additional help, please repost!

Thanks for using FixYa - a FixYa rating is appreciated.

Posted on Jan 29, 2009

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