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floor jack goes up ok but won't hold Answered

I have replaced the o-rings and replaced the hydro oil pumps up a lot better than before but will  not hold also how to adj the air the one you are not to mess with 

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user
seandogue (author)2017-02-03

Also, check the pressure release and fill port. My dad had a really old (circa 1930s or maybe 1940s..big thing, about 4 feet long) floor jack whose pressure release(located on the drag handle) wouldn't fully engage, and one time, after replacing the hydraulic fluid the fill port was a bit loose

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user
iceng (author)2017-02-02

I agree with cerberustugowar

that it is leaking past a return valve where the tiniest bit of dirt will disable the unit.

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user
cerberustugowar (author)2017-02-02

is it an air over hydraulic? or just a regular floor jack?

maybe it's leaking past the return valve or maybe there is some sort of damage to the barrel?

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