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Re: [Shop-talk] Hydraulic Jack Diagnosis

Subject: Re: [Shop-talk] Hydraulic Jack Diagnosis
From: Donald H Locker <>
Date: Sun, 22 May 2022 18:17:43 +0000 s=protonmail3; t=1653243473; x=1653502673; bh=LoKK1/20bpUZbrvFSqW6tE3QjfTuf57W2K7hueHliBo=; h=Date:To:From:Reply-To:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID; b=hG/bF/x+v4KGx0IEtS1hB4yCiuXKAbecxm+syS3+mm2vl8UZe+vJy1phg3k5LeUV4 15pTMTblnSIUjPM2IKIj6rJyGSlQmV0H/GrXi61ByGtu0PHQmYQBnP2kyo/gMbABKB xMx5djEygwO4HhBQjc4x2Yq3kXBJrkCaZtOJI7IzIhmjCmlGxFUI6QBmKgB9BfXfFF 7TDD1hCwefAnG0OKzYkhPD0afnSOeRmoV5xTLWaDuN2Vo50N9ykoeuh4uyT4i9NTTx WRIJjCeFlWu/ENjokj7gS1VoinevWlDOt/6qvD2GB+qigrJ9pDOgCtXzAncodEIOvW p5B+vfxmT0olQ==
Feedback-id: 21814894:user:proton
References: <>
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.


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 (
> <> ) 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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