strange power steering problem

[vr6turbo 27]

I have changed a few power steering pumps on vrs in my time

this problem takes the biscuit

the story goes

been having a problem with the car pulling left all the time

so I decided to change the power steering rack and pump

engine out

new rack in

filled the reservoir with vw fluid and primed the new pump

started the engine all fine power steering working great

switched off and restarted no PS

 

now when I rev the engine to about 3500 rpm the PS works a little

but at idle it does not work

 

I have fitted 2 brand new pumps both have the same problem

change the fluid replaced the pressure pipe

blown out all the hoses and cleaned them

 

I then took the pump off removed and inspected the relief valve

took the spring out  refitted the relief valve and spring

refitted the pump hey presto all working again at tick over

restarted the car same again no PS at tick over

WTF

any thoughts appreciated

 

come to the conclusion that the pumps knackered as it is squealing like a goodun now

Edited June 1, 2014 by vr6turbo

[abvsean 32]

mines died and squeeling like a stuck pig,

 

how do you prime them before initial run??iv tryd pouring it down the lines to the pump but get fluid everywhere.Fail.

[Lukey. 381]

To prime you steer from lock to lock loads of times

[Reaperx 181]

To bleed the system take the lid off the reservoir and lock the car side to side with the wheels on the floor. Then switch the car off leave the cap off and let the fluid settle should be quite frothy as it lets the air escape then just repeat a few times until you are happy with it.

[abvsean 32]

Is that it??ah i had been doing that origionally i just thought i was missing a trick, cheers

Just my last pump has just died and i dont want to ruin the new one

[Reaperx 181]

Yeah just start it lock to lock leave cap off and then bugger off for a hour or so and let it settle. That's all I do at work I leave them for few hours occasionally going back and redoing it.