hydrolic pump xantia

[taffy]

Hi guys....
This has been bugging me for a while now...I can hear and feel The hydrolic pump running cutting in and out every 2 seconds...strainin The engine...I get a click every 25-30 secs off The accumulater so that's ok...I'm thinking its either pump knackered or internal pressure loss in system...my sudpension is also lazy and I haven cleaned The lhm yet however its pretty much new as had a leak on front return rubber pipe on front hydro sphere and its had new oil....all sphere were new as off 7000 miles ago...4 months....any ideas would be grately apprraciated
Taff

[citronut]

sound like the pump is sucking air from somewhere

[taffy]

Its been doing it quite a while now...hmm so The feed to it is from The lhm tank..is this a known problem?

[xantia_v6]

Hi guys....
This has been bugging me for a while now...I can hear and feel The hydrolic pump running cutting in and out every 2 seconds...strainin The engine...I get a click every 25-30 secs off The accumulater so that's ok...
Taff

I am confused, the regulator tick is what controls the pump working, so is the regulator cutting in every 2 seconds or 20?

If the car is hydroactive, an electrovalve with internal leakage can have quite an effect (usually only in soft mode).

[taffy]

Yes I been thinking The rear electrovalve and The suspension can be lovely one min and solid The next....also everytime I stop engine The rear sits on its bump stops...does this sound like electrovalve?

[citronut]

i dont have much knowledge of the hyper active system,

taffy says "I get a click every 25-30 secs off The accumulater"

the regulator/accumulator is what switch's the pump pressure in and out,
so if the pump is ticking/chattering but the regulator is only ticking every 25-30 secs, i would say the pump is sucking air from somewhere

[CitroJim]

The pump should only 'chatter' when actively pressurising. generally you hear a regulator tick followed by a short burst of chatter as the pump works to rebuild pressure and then it goes silent again until the next tick.. That's the normal..

So, say 30s between ticks and say two or so seconds of chatter after the tick.

What it sounds like is yours has a massive internal leak or a flat accumulator and what you're hearing is a pump struggling to achieve pressure and eventually it does and then you hear a tick but then pressure is lost so quickly that it has to start working hard all over again so it's pumping almost constantly but the tick interval sounds normal.. I've known pumps to work continuously with no tick at all as full regulator cut-out pressure can never be achieved.

Even though there's an apparent long tock interval I'd still point the finger of suspicion at the accumulator sphere in the first instance...

If not that then electrovalve leaks are a possibility. Normally they only leak in soft mode and are OK in hard so as a test force hard mode by pulling the hydractive ECU fuse and see if it changes...

[Old-Guy]

i dont have much knowledge of the hyper active system,......

I love it.

The expert (Jim) has provided the definitive answer.

[taffy]

thats an excellant discription jim thank you...
i have a much better idea now so i will get hunting....also the tick from accumulater is sometimes quiet and sometimes loud...does this mean anything?

[CitroJim]

also the tick from accumulater is sometimes quiet and sometimes loud...does this mean anything?

Yes, it does as the regulator can produce two ticks. One on regulator cut-in and one on regulator cut-out. They are usually of very different volumes and often one is inaudible unless you listen very carefully. I think the cut-out tick is the loudest and is the one you normally hear.

[taffy]

Ok I'll had a quick look as I'm at work and its freezin!
Had it running and it sounds like this as u say it pump pump pump pump stop pump pump pump pump stop etc lol....looked at The main feed to pump..it looks ok exept on The bend on top of pump its like black man pinched in two places and there was jus a very very small seep on lhm bout inch long....I put my hands on pipes coming out of lhm tank and can feel movement surge like pressure building and releacing but nothing on The pump....jus tried hydro fuse and still The same....jus doin citrobics...stop lights stayed on bout 25 secs...now this is mad since iput it from low to high it didn't make a sound as soon as its on full height its doin it and its erstic now....putting it to low now and its doing it but as origionally...on floor now and set it too full again and its stopped again....odd this

[taffy]

In recap only time it doesn't do it is wen I move The height leaver from low to high and instantly it stops until it reachs full height

[taffy]

It sounds awefull wen u rev The engine....same timeing but different sound to The tappin noisehigher pitch with revs

[taffy]

So what regulates The pressure at The accumulater block...spring and ball bearing or electro valves?

[citronut]

In recap only time it doesn't do it is wen I move The height leaver from low to high and instantly it stops until it reachs full height

i'd say its your accumulator sphere then

what does it do if you press the brake pedal several times, does it start ticking more again