there is no reason why the pump should not turn smooth in both directions.
Usually it did. Thererfore i said i would take care.
At the Gileraclub meeting last weekend one has 2 pumps with him. Both turn the same in both directions.
Mine broke 2 years ago.
I could hear it squeaking at a red traffic light
I drove back very slow and removed the cover to turn the pump by hand. I could feel the play.
Next day i removed the pump. It turned somehow 'bumpy'
Next day it did not turn any more. Trying to do, there was a lot of rusty crumps coming out.
I suppose the bearings are running out of grease or something like that.
You may find some water in them.
If you are early enough, the sealing package is still alive and you have only to change the roller bearings.
There is a video from Luca at youtube and a guidance at the french rapidmouse site.