C5 - High Pressure In Steering Pipes

[Guest Peke]

What could cause high pressure to power steering returning pipe? Pipe set is new ( old was broken for same reason after hydraulicpump change ) and when engine starts, pressure pulls pipes off.

 

BR, Peke

[GreenBlood]

What could cause high pressure to power steering returning pipe? Pipe set is new ( old was broken for same reason after hydraulicpump change ) and when engine starts, pressure pulls pipes off.

 

BR, Peke

 

I'm just guessing here but, have you overfilled the LDS tank? Level is read with suspension set on LOW and fluid should just appear at the bottom of the filler filter. These tanks are under presure so overfilling can crack the tank or in your case may be blowing the return hose off? Just thinking out loud...

 

Cheers

Chris

[Guest Peke]

Thanx for answer Chris. I't possible that there was too mutch fluid in tank, i'll check on that. But if left tank cap open, so 'over' pressure goes that way out, right ? That tank pressure comes from steering pump, not hydepump, i'm i right ? And steering pump can not make a lot of pressure ? If some pipe is blocked, can that be the reason ?

 

Br, Peke

[GreenBlood]

Thanx for answer Chris. I't possible that there was too mutch fluid in tank, i'll check on that. But if left tank cap open, so 'over' pressure goes that way out, right ? That tank pressure comes from steering pump, not hydepump, i'm i right ? And steering pump can not make a lot of pressure ? If some pipe is blocked, can that be the reason ?

 

Br, Peke

 

Hi again,

I'm sure there are members here with more knowledge than I have, I'm just thinking things through with you...

 

Did you depressuerise the system when you changed the hydraulic pump?

See here for a PDF on correct procedure >>> http://www.aussiefrogs.com/forum/showpost.php?p=804232&postcount=14

 

Is it possible you still have air in the system? Try moving suspension up/down up/down and turning steering full left/right a few times.

 

Cheers

Chris

[paul.h]

If there is a blockage causing a pressure build up it would have to be on the tank side return of where the pipe blows off so will limit checks needed.

 

Is the replacement pump identical to the old pump and not giving a higher flow (which would increase the pressure drop across the piping) or higher pressure ? Why did you replace it, had something broken off it internally which could now be in the piping ?

 

The French RTA manual says the pump gives 100 bar (145 psi) but most of this will be lost over the steering rack but if you do have a blockage on the return side of the rack then up to the blockage point you could see this pressure. Maybe you could try poking a wire down the piping and the tank inlet. When I last unscrewed the cap on the fluid reservoir there was slight pressure inside (similar to opening a radiator cap) so I would also make sure any hose clips are tight.

[coastline taxis]

Have you had the steering rack checked as the return valve could be at fault. Why was the pump changed. Also is the steering ok

[Guest Peke]

Hi, VERY good points raised up, i have a lot of checking to do :rolleyes:

Hydraulic pump is changed, because it starts to blow up that Maxifuse ( 40 A ) in engine room and eventually pump brokes up ( electric parts, that where the connectors are, i think ).

Block in hose ( tank side ) seem to be reasonable, but i wonder what cause that block. If there are same dust or dirt in hose, very high pressure would make that go to tank, i assume ?? Is it possible that air ( bubbles ) in system make pressure go up ??

I'll keep this post updated after checking mentioned things.

 

Br, Peke

[Randombloke]

I think there is some confusion here.

 

Unlike older Citroëns, the C5 hydraulic pump and the power steering are completely separate.

 

The hydraulic pump is electric. The power steering pump runs off the engine via an auxiliary belt.

 

Yes, I've checked in the manuals.

[paul.h]

So Peke has replaced the suspension pump and not the power steering pump.

 

To clarify, we need to know is it a suspension fluid return pipe that is blowing off or is it a power steering pipe.