The Definitive Hydraulic Pump Resistor Thread (with videos)

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Jan 14, 2013 | 04:20 PM

#41

Gus

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Joined: Jul 2008

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From: Berlin Md.

See if this provides you the information you are looking for.

Link JagRepair.com - Jaguar Repair Information Resource
Link JagRepair.com - Jaguar Repair Information Resource

As for temperatures and the relationship of the hose failures that topic has been brought up many times with no real solution.

Quote:

Originally Posted by baxkr

Interesting. I haven't seen mention of the low end of the operating temperature range for the stock hoses. If you look at the various pressure traces posted you will see that there is, indeed, a pressure spike at the start of the cycle. It is shorter and slightly less extreme. It suggests that the main rams may be being pressurized before the catch is fully open (most significantly before the two retaining pins have withdrawn from the alignment lugs on either side of the main catch). Again this could suggest a timing issue with the design - not sure yet.

Thanks for the update

I have a question for the various folks who have posted pressure plots:

- Was anyone able to run parallel plots for the main rams and front catch hydraulic circuits? It would be very interesting to see how long both circuits remain pressurized together.

Nick

Jan 14, 2013 | 05:40 PM

#42

Dennis07

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Joined: Sep 2010

Posts: 1,713

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From: New Jersey

Nick,

And please also see here.

Jan 15, 2013 | 11:19 AM

#43

baxkr

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Joined: Dec 2012

Posts: 66

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From: Southern California

Ouch

If I have inadvertently trodden on hallowed ground I apologize to any and all I may have offended. I'm merely coming in (apparently late) to a discussion about a problem I share with many others and trying to get to the root cause.

I will continue to dig since it is likely that I run the risk of a green shower at some point in the future and will share any pertinent (and new) information I am able to produce. I plan to focus on the control system since that's where I believe the fundamental issue to lie; however I may yet be wrong.

If anyone in the SoCal area has access to a pair of pressure transducers I'd be happy to meet with them and continue the investigation at our mutual convenience.

I ran across a quote last night that struck me as pertinent. Again please don't berate me if this create some perceived affront - none is intended.

Nick

"Sit down before facts as a little child, be prepared to give up every preconceived notion, follow humbly wherever and whatever abysses nature leads or you will learn nothing" - Thomas H. Huxley

Jan 15, 2013 | 11:28 AM

#44

Dennis07

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Joined: Sep 2010

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From: New Jersey

Quote:

Originally Posted by baxkr

...
"Sit down before facts as a little child, be prepared to give up every preconceived notion, follow humbly wherever and whatever abysses nature leads or you will learn nothing" - Thomas H. Huxley

I like it. A lot like something Richard Feynman might have said.

Jan 15, 2013 | 11:32 AM

#45

Norri

Joined: Oct 2007

Posts: 121,065

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From: PHX some of the time

This is a much discussed and debated topic, however any new information is always welcome.
A fresh mind is usually a good thing when looking at a problem.