floor jack question

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  #1  
Old 11-27-07, 09:01 AM
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floor jack question

I have a 20 y old sears floor jack. It raises a load but gradually drops w/or w/o a load. I have never added oil and it looks a bit low. Is oil the problem or is the pump likely bad?
Also, jack oil is pricey, and the manual says no motor oil, just jack oil. I have heard that brake fluid is bad, but I might be able to use ATF. Any recommendation on a substitute oil?
 
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  #2  
Old 11-27-07, 09:23 AM
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Jack oil is not expensive. Sounds like the seals could be going out with a jack that old. I would ask Santa for a new jack (I actually did last year). The life you save may be your own.
 
  #3  
Old 11-27-07, 11:24 AM
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I took an old floor jack with the same symptoms and the lifting cylinder seals were definitely bad (the pump should be isolated from the cylinder by a check valve). My jack was not an expensive unit and I was appalled at the low quality seals used in it. I tried replacing the seals but it never worked right; itwasn't built for good seals and always leaked. Ended up trashing it for safety and convenience.
 
  #4  
Old 11-27-07, 06:58 PM
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Use jack oil
I'd change it out, and see if that helps (it surely is compromised at this age and needs to be changed)
If not, then you'll need new seals also

A jack oil change is cheaper than a new jack
 
  #5  
Old 11-27-07, 08:32 PM
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Originally Posted by rleescott View Post
I have a 20 y old sears floor jack. It raises a load but gradually drops w/or w/o a load. I have never added oil and it looks a bit low. Is oil the problem or is the pump likely bad?
Also, jack oil is pricey, and the manual says no motor oil, just jack oil. I have heard that brake fluid is bad, but I might be able to use ATF. Any recommendation on a substitute oil?
You can open the hydraulic cylinder and pull out the piston. Since they assembled it, it must be disassemblable. On mine, the o-ring between the piston and cylinder became shredded. I found the right size o-ring from Lowes.

If oil is short, it will not go up max height.

If oil is dirty, sealing surfaces/seals may degrade.

Replacement oil: I don't know enough to comment.
 
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