[6pack] Hydraulic Jack Question

[Vsnively at aol.com]

In a message dated 3/7/2008 1:28:01 PM Eastern Standard Time,  
75TR6 at 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 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 
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_ 
(http://money.aol.com/tax?NCID=aolprf00030000000001)   







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



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