[TR] [6pack] Hydraulic Jack Question

[Bob Danielson]

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 at aol.com [mailto:Vsnively at aol.com] 
Sent: Friday, March 07, 2008 11:24 AM
To: 75TR6 at tr6.danielsonfamily.org; triumphs at autox.team.net;
6pack at autox.team.net
Subject: Re: [6pack] Hydraulic Jack Question


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 
	_______________________________________________
	
	Support Team.Net  http://www.team.net/donate.html
	
	6pack at autox.team.net
	http://autox.team.net/mailman/listinfo/6pack
	
	http://www.team.net/archive
	
	You are subscribed as vsnively at aol.com
	

 
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




________________________________

It's Tax Time! Get tips, forms and advice on AOL Money & Finance.
<http://money.aol.com/tax?NCID=aolprf00030000000001>