That's an odd set of symptoms. An inability to raise a load sounds like
air in the hydraulic system. Leaking seals or valves would cause a load
to drop with oil passing through the seal/valve.
With no load, the air pressure doesn't collapse the bubble so the jack
rises; but with a load, any pressure collapses the bubble instead of
raising the load. The fact that it holds after it was raised supports
this hypothesis.
I think just opening the oil filler screw (and maybe topping the oil)
will fix it.
HTH,
Donald.
On 2022-05-22 14:03, Jeff Scarbrough wrote:
> Just trying to keep from going down the wrong rabbit hole..  On
> Thursday, I think I blew up the TR6 differential. I pulled out my handy
> Craftsman 3.5 ton floor jack (50145) and discovered it will not raise
> any weight. It will pump up with no load, and does not seem to creep
> down under the load of my immense personal bulk. To me, this indicates
> a pump problem - seals or valves. It is full of oil, and has worked
> well for the last 25 years or so.
>
> I found a kit that seems reputable for $30 (
> https://www.hcrcnow.com/shop/seal-kits/product/8118
> <https://www.hcrcnow.com/shop/seal-kits/product/8118> ) that contains
> all the seals to rebuild it, but that place doesn't carry oil. I can
> get any number of different brands of jack oil locally, so I don't think
> that's going to be a problem.
>
> Any other thing I might check before I pull the trigger?
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