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Thread: Hydraulic Jack help
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3rd Jun 2019, 12:20 PM #1Senior Member
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Hydraulic Jack help
Hi Guys
I have an old hydraulic Jack Id like to use in a simple press.
It pumps up ok but when I stand on the top of the piston it slowly contracts back to the start position.
I didnt turn the little jacking ring through 90 degrees either.
Any suggestions how to fix it, if possible
Its marked A5 and I have not used it in 40 years
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3rd Jun 2019, 02:28 PM #2Member: Blue and white apron brigade
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A couple of possibilities but the most likely one I have seen is the hydraulic oil release screw or seat is dirty or damaged.
When this happened to be I removed the screw and cleaned it up and it then worked.
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3rd Jun 2019, 03:06 PM #3Senior Member
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Brian, your jack is a old Lightburn or a copy, I would drain the oil out of it a try flushing with ATF.
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3rd Jun 2019, 04:54 PM #4Senior Member
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thanks Whitey and Bob.
What'a ATF?
regards
Brian
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3rd Jun 2019, 04:55 PM #5Senior Member
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Bob--How do I get into the 'screw or seat" to clean it up please/
regards
Brian
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3rd Jun 2019, 05:07 PM #6Most Valued Member
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3rd Jun 2019, 06:37 PM #7Member: Blue and white apron brigade
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It's the screw you turn to let the jack down. I assume your jack has one of these otherwise how does do you let it go down.
Oh I see its one of those where the lever ring is rotated thru 90º - in that case scrap my idea. I'd go with whitey's idea of changing the oil.
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4th Jun 2019, 12:49 AM #8Senior Member
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Unless otherwise specified by the manufacture NEVER, NEVER ever use ATF in any hydraulic systems. The additives in ATF can result in a softening of the seal and premature failure.
Any hydraulic system that has not been used for 40 years should be stripped and have the seals replaced. The seals will either be rock hard or soft and gooee. Not good when applying a load.
Tony
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4th Jun 2019, 08:07 AM #9Senior Member
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So it appears this might be a much more complicated job than I realise/
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4th Jun 2019, 10:01 PM #10Senior Member
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It should not be to hard to pull apart and service.
By the looks of it there should only be a circlip and a retainer ring holding the rod/piston in.
The pump piston might just pull straight out. If not there might be a circlip holding that in as well.
Behind the plug on the lower right hand side there should be some springs and balls. Just be carefull to note the order in which it all comes out.
Seals and O rings should be off the shelf arrangement.
Tony
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6th Jun 2019, 02:42 PM #11Banned
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I'm guessing by now there's a few thousand youtube videos on how to fix hydraulic jacks..
.
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