Subject: Re: [Shop-talk] Hydraulic Jack Diagnosis

From: David Scheidt <[email-masked]>
Date: Sun, 22 May 2022 13:11:54 -0500

> On May 22, 2022, at 13:04, Jeff Scarbrough <[email-masked]> wrote:
> 
> 
> 

> Any other thing I might check before I pull the trigger?

Bleed it.  Make sure you are checking the level with the ram in the right place (most want it down, a few up). 

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From: Pat Horne <[email-masked]>
Date: Sun, 22 May 2022 13:14:23 -0500

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Jeff, I=E2=80=99d try opening the valve & then pull the saddle up & let it g=
o down a green times. Sometimes that will move crud away from wherever it is=
 causing the problem. If that doesn=E2=80=99t work just take the pump apart t=
o see how the seals & bore look. Can=E2=80=99t hurt.=20

Peace,
Pat

Pat Horne=20
We support Habitat for Humanity

On May 22, 2022, at 1:04 PM, Jeff Scarbrough <[email-masked]> wrote:

=EF=BB=BF
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 t=
on floor jack (50145) and discovered it will not raise any weight.  It will p=
ump up with no load, and does not seem to creep down under the load of my im=
mense 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/se=
al-kits/product/8118 ) that contains all the seals to rebuild it, but that p=
lace doesn't carry oil.  I can get any number of different brands of jack oi=
l locally, so I don't think that's going to be a problem.

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archi=
ve

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Jeff, I=E2=80=99d try opening the valve &am=
p; then pull the saddle up &amp; let it go down a green times. Sometimes tha=
t will move crud away from wherever it is causing the problem. If that doesn=
=E2=80=99t work just take the pump apart to see how the seals &amp; bore loo=
k. Can=E2=80=99t hurt.&nbsp;<div><br></div><div>Peace,</div><div>Pat<br><br>=
<div dir=3D"ltr">Pat Horne&nbsp;<div>We support Habitat for Humanity</div><d=
iv><br></div></div><div dir=3D"ltr"><br>On May 22, 2022, at 1:04 PM, Jeff Sc=
arbrough &lt;[email-masked]&gt; wrote:<br><br></div><div dir=3D"ltr">=EF=
=BB=BF<div dir=3D"auto">Just trying to keep from going down the wrong rabbit=
 hole..&nbsp; &nbsp;On Thursday, I think I blew up the TR6 differential.&nbs=
p; I pulled out my handy Craftsman 3.5 ton floor jack (50145) and discovered=
 it will not raise any weight.&nbsp; It will pump up with no load, and does n=
ot seem to creep down under the load of my immense personal bulk.&nbsp; To m=
e, this indicates a pump problem - seals or valves.&nbsp; It is full of oil,=
 and has worked well for the last 25 years or so.<div dir=3D"auto"><br></div=
><div dir=3D"auto">I found a kit that seems reputable for $30 ( <a href=3D"h=
ttps://www.hcrcnow.com/shop/seal-kits/product/8118">https://www.hcrcnow.com/=
shop/seal-kits/product/8118</a> ) that contains all the seals to rebuild it,=
 but that place doesn't carry oil.&nbsp; I can get any number of different b=
rands of jack oil locally, so I don't think that's going to be a problem.</d=
iv><div dir=3D"auto"><br></div><div dir=3D"auto">Any other thing I might che=
ck before I pull the trigger?</div></div>
<span>_______________________________________________</span><br><span></span=
><br><span>[email-masked]</span><br><span>Donate: http://www.team.=
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m.net/archive</span><br><span></span><br><span>Unsubscribe/Manage: http://au=
tox.team.net/mailman/options/shop-talk/[email-masked]</span><br><span=
></span><br></div></div></body></html>=

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[email-masked]

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From: Donald H Locker <[email-masked]>
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

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.
>

[email-masked]

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From: Jeff Scarbrough <[email-masked]>
Date: Sun, 22 May 2022 16:03:32 -0400

> That's an odd set of symptoms

Indeed.

I went through the bleeding instructions...with each stroke of the
pump, I can see oil moving in the reservoir (with the release valve
open).  This tells me the air is out and the pump is moving
fluid....but...while testing this, I left the handle in the midway
position (with the release valve closed), and noticed that it falls to
horizontal pretty quickly.  This seems to be further evidence that
something is wrong with the pump.  The jack itself does not seem to
drift down.

On Sun, May 22, 2022 at 2:18 PM Donald H Locker <[email-masked]> wrote:
> Unsubscribe/Manage: http://autox.team.net/mailman/options/shop-talk/[email-masked]
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