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
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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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