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Much searching via the i-net?
Sometimes public libraries would collect repair manuals on microfiche.
The manufacturers would sell rebuild kits. New o-rings and such with instruction so long as the piston and bore are not heavily scored. And new hydraulic fluid.
On the craftsman 3-ton trolley jack I have, it was a leaker when in the stored position. Fluid came out the large bore hole the piston rams into for the lift.
On the jack assembly are adjustable valve I guess for fluid in and fluid out. I tightened these. No more leaks. Yet the o-rings are not forever.
I imagine with a search using Bing and Google maybe you could find rebuild kits with good instruction?
I've yet to rebuild a trolley or floor jack. Merely replaced the old fluid in prior jacks. Had to use Ford "Type F" in a pinch for fluid.
Else, jacks I guess are disposable also including quality-made jacks that have some service on them. Not seen a rebuild kit in some time and that was images of the kit.
Hope that helps you Old Duke!
Happy Friday!
My best to the shining sea fishies and the next bottle of ripple.
I've been quaffing the 32-ounce cans of Miller High Life light.
MacDuffy
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Woo.
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