In a message dated 3/7/2008 1:28:01 PM Eastern Standard Time,
75TR6@tr6.danielsonfamily.org writes:
The jack that drifts or leaks down is my old one that I'm using to put the
diff back in (http://tr6.danielsonfamily.org/DiffCarrier.htm) My main jack
is an Aluminum one by Arcan and it carries the statement: In accordance with
ASME PALD Standard section 10-4.1.2 Load Sustaining Test: A load not less
then the rated capacity shall not lower more then 1/8" in the first minute
nor a total of .1875" in 10 minutes.
Pretty tight tolerances as I have trouble even measuring 1/8" ;-)
Bob Danielson
1975 TR6 CF38503U
Running w/ Throttle Body Injection
http://tr6.danielsonfamily.org
________________________________
From: Vsnively@aol.com [mailto:Vsnively@aol.com]
Sent: Friday, March 07, 2008 11:24 AM
To: 75TR6@tr6.danielsonfamily.org; triumphs@autox.team.net;
6pack@autox.team.net
Subject: Re: [6pack] Hydraulic Jack Question
In a message dated 3/7/2008 9:09:09 AM Eastern Standard Time,
75TR6@tr6.danielsonfamily.org writes:
What causes a jack or even an engine crane to stop holding a
position and
settle back down after a while? Is it low fluid or a bad gasket or a
combination of things? I know that there's an industry standard for
how much
one can drop over an x period of time. But I'm talking about a
matter of
minutes with or without a load on it?
Bob Danielson
1975 TR6 CF38503U
Running w/ Throttle Body Injection
http://tr6.danielsonfamily.org
6pack@autox.team.net
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Bob,
You don't mention the age of the jack, but typically it's fluid leaking
past a piston seal, or more likely, a check ball / valve seat is worn and
allows fluid to flow when and where it shouldn't. There can also be an
internal crack in a body or housing that allows an unwanted fluid path as
well. The answer, generally speaking, is fluid is flowing where it shouldn't
be. It's lazy and takes the path of least resistance, like some of my
neighbors. You could also have an aeration issue caused by improper fluid
level in the reservoir.
I am in industrial fluid power and am not aware of allowable drift
standards. Drifts could be catastrophic, depends on the application. I would
be interested in hearing more, offline.
Thanks.
Regards,
Vic Snively
'75 TR6 w/AC
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Bob,
Thanks for the enlightenment. I suppose everything has a tolerance, it's a
little unsettling knowing that PALDs have allowable drop. At least there is an
industry standard.
Regards,
Vic Snively
'75 TR6 w/AC
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