Hydraulic jack repair

Not to hard to do. most any getting nut off is biggest challenge. time running around trying to find parts them esprecialy bottle jacks its cheaper to replace unless air powered ones. Imports are so cheap they arnt worth it.
 

Any good old one will be designed to be opened up and have its seals/ O rings renewed, most only have two or three . Most bearing shops will have a range of seals to suit almost anything . Important things are cleanliness and lubricating seals and surfaces to stop straining or tearing when replacing .
 
Usually depends on what's wrong with it.

If it's creeping down, or just won't jack up, it's usually a blown seal on the ram.

They're usually easy to get apart, just unscrew the top, pull out the ram. The seal is on the bottom of the ram. If it is bad, you will see where it is split or blown out. If you don't see a problem with the seal, it usually isn't productive to go any further, something else is wrong and most likely not feasible to repair.

When replacing the ram seal, be sure to go back with a polyurethane seal, exactly like the one that came out. Trying to substitute a hydraulic cylinder seal will not work, BTDT! The seal can be bought at a seal supply. Be sure to specify it is for a jack.
 
I have replaced the O-rings on the "pump" on my engine hoist when they leaked. So far so good, never tried the cylinder repair,yet. joe
 
If it only has air in the cylinder - 7 to 10 full strokes with an open needle (release) valve. If it's been neglected and abused for decades - could be a lifetime project.
 

I just picked-up an ancient bottle jack at the junk yard...took it home and it worked perfect!!...I jacked the steering cylinder pins out of an 8760 Deere with it..

Then too I've bought brand-new jacks at NAPA and they wouldn't work from brand-new out of box...took three jacks to get one that worked :(

A couple Chinese made 20 ton air/hyd bottle jacks I bought not too long back came with seal kits included
 
Depends.

many of them can be rebuilt with simple orings.

I have rescued big bottle jacks and small floor jacks from the junk yard and put orings out of multi kits in. sometimes not a exact perfect fit.. but they fit. I'm still using all those jacks.

i have a floor jack from the dump. new oring and I put 90wt gl1 gear oil in it. It's still working 20+ ys later.

All depends on how cheap the jack was, how easy it is to get apart as to how easy to fix.
 
John:

Try this.


Doc :>)
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Jack Repair
 

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