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Old 03-15-2011, 04:48 PM
dethomson dethomson is offline
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Fixing a floor jack that won't stay up

I have a 3T floor jack that pumps up, but won't hold. It starts to settle back down as soon as I stop the pump stroke. No, I'm not overloading the jack.

What's wrong? Does it just need to be bled or what?

It did this a bunch of years ago but seemed to self correct after leaving it alone for a real long time. It was working great, but got left outside back in the fall and got wet. I pulled it into the garage when I realized it was outside, but didn't try to use it until recently. I had to break out a bottle jack.
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Old 03-15-2011, 06:37 PM
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If your fluid level is good, then the seals are shot. If you know the brand, you can usually find a rebuild kit. If you don't know the brand you will have to take it apart and take all the seals and gaskets to a bearing house to have them matched up. If the main piston is scored from rust (left outside) it sould probably be cheaper and easier to replace it with a new unit.
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Old 03-15-2011, 06:41 PM
dethomson dethomson is offline
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It's a Sears and is a really good jack except this that's happened twice now. I'll check the fluid level. I never leave the jack up or use it harshly, so the piston should look pretty good. I'll check that too though.
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Old 03-16-2011, 12:05 AM
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fixnair fixnair is offline
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A piece of dirt or debris can become lodged under a check ball and cause the same thing. Change oil and flush it out with some hydraulic oil, NOT BRAKE FLUID! ATF would work OK.
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Old 03-16-2011, 04:59 PM
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Sears should have rebuild kits for it, they will need serial number to locate the kit. You could try changing the oil, couldn't hurt.
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Old 03-23-2011, 04:25 PM
brownfoot brownfoot is offline
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don't count on Sears having the rebuild kit, they didn't for mine.........about a '79 model
was able to clean, replace o-rings by matching, replace oil (used hydralic jack oil from Tractor Supply)
works fine now
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Old 03-23-2011, 07:47 PM
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Outstanding job, and be careful when jacking......lol.
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Old 05-02-2011, 04:10 PM
Beechkid Beechkid is offline
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A little viagra will help the seals swell back up
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Old 05-02-2011, 04:10 PM
 
 
 
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