hydrolic pump xantia

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Re: hydrolic pump xantia

Post by Mandrake »

taffy wrote:So what regulates The pressure at The accumulater block...spring and ball bearing or electro valves?
Early pressure regulators in ID/DS were a very simple ball and spring arrangement much like the pressure regulator in a power steering system, but all the pressure regulators from the GS in 1970 up until the Xantia are a dual shuttle valve system that operates as a positive feedback bistable with hysteresis, (much like a 2 transistor bistable for those of you with an electronics bent!) hence the different cut in and cut out pressures and the very positive snapping open and shut action rather than the constant partial leakage you get with a simple ball and spring relief valve system.

For whatever reason it's the cut-out click that is loud and audible as the pressure reaches maximum. I usually can't hear the cut-in click over engine clatter unless the regulator is badly worn...

Here is the internal diagram: (click for full image)
regulator.jpg
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Re: hydrolic pump xantia

Post by taffy »

Really....might I have purchased a duff sphere not long ago then?
Yea I tried allsorts to see if it stopped holding steering and brakes an sudspension...brakes had no effect on it....
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Re: hydrolic pump xantia

Post by taffy »

Well saying that if The sphere was gone id be getting tick tick tick tick from it wouldn't I?
Could there be any internal injuries to The springs or seals perhaps? I'll giv The sphere a go thou
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Re: hydrolic pump xantia

Post by Hell Razor5543 »

The accumulator sphere serves several purposes (providing pressure if the pump fails), but it also smooths out the changes in pressure. If the sphere is flat, the spikes in pressure can cause expensive failures, such as the pipework or the regulator.
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Re: hydrolic pump xantia

Post by taffy »

Well wen I bought The car all The spheres were shot...I prob done bout 1000 miles before I got all new spheres...I remember it ticked like crazy then and after The change its like every 20-25 secs...I will defo order a new one this week as a start...hope it is
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Re: hydrolic pump xantia

Post by taffy »

ok I gota change this as been leavin car running and pottering about and from outside I can hear it properly...pump pump pump pump tick..pump pump pump pump tick..so The cut in is goin every 4 seconds...could it still be sphere?
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Re: hydrolic pump xantia

Post by CitroJim »

The accumulator needs to be swapped out to eliminate it from enquiries Taffy..

Now then, when you switch off the engine can you hear a sound like a flushing loo? This is often a noise leaky Hydractive valves make.. The noise is made by LHM rushing at great speed along the leakage return pipes...

Basically, Hydractive electrovalves should only leak a small spurt when changing between hard and soft and ath other times the leakage should be negligible.

So, if the accumulator proves to be good then a test of the electrovalves is to disconnect their leakage returns (small rubber pipe attached to their tops) and replace with a clear tube going into a large jamjar. You can then see if they are leaking excessively.

That's to be done after you find the accumulator to be good...
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Re: hydrolic pump xantia

Post by taffy »

thanks jim....
I will get new sphere and try that...mad if it is only put it on 4 month ago...
Tryed turnin car off and listening but hear nothing...
Thanks again will report back wen fitted
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