No power steering when stationary

[Clan]

Originally Posted by luggsey

My XC70 had filthy pas fluid when I got the car, I removed it by using this method.

Drain the resovior.
Remove the return pipe and route into a waste collector, I used a water bottle.
Block the return pipe hole in the resovior.
With the front wheels on plastic bags manually turn the steering wheel lock to lock and the fluid pumps out the return.
Keep topping up the resovior until it's clean.
It's a nice steady way to change the fluid.

My steering is slightly heavy on tickover, maybe these pas pumps are not speed sensitive?

the pump when good should produce 120 Bar at idle with the output blocked and the pressure relief valve opening ..

[S60D5185]

Hi
Is the pressure relief valve inside the pump, considered trying another pump next ?

[Clan]

Originally Posted by S60D5185

Hi
Is the pressure relief valve inside the pump, considered trying another pump next ?

-yes it is in the pump , Generally if the pump is weak you feel a bit more assistance if you rev the engine , A good pump puts out the full pressure at any rpm .

[S60D5185]

Thanks
I’ve tried turning the wheel whilst stationary then reving to 3000rpm but the steering effort doesn’t change. How do I determine if it’s the pump or rack/speed sensor?
Is anything likely to show on Vida/dice ?

[Clan]

Originally Posted by S60D5185

Thanks
I’ve tried turning the wheel whilst stationary then reving to 3000rpm but the steering effort doesn’t change. How do I determine if it’s the pump or rack/speed sensor?
Is anything likely to show on Vida/dice ?

you need to take it to the dealer who has the correct pressure gauges to test the pump .

[S60D5185]

Just to update this post, I exchanged pumps with another XC90 in the family which seems to have sorted the problem (need to get another pump now!) thanks for your help everyone.