Does any one have a diagram of the steering pump?

 

bump

 

Any suggestions where I might find a diagram or expanded view?
I've search online.
The piston is moving smoothly but pressure will not build up. I mean no pressure.

 

I have not seen any manuals on that. On mine A6 C4 the pump is composed of two parts - you can easily disassmble it and replace sealings.

Check its belt as well - does it rotate at all? What do you mean by piston moves smooth?

 

There's a small piston on the pump that was stuck and scored, caused a lot of noise.