[6pack] Hydraulic Jack Question

[Vsnively at aol.com]

In a message dated 3/7/2008 9:09:09 AM Eastern Standard Time,  
75TR6 at 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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