[slief]

Originally Posted by sensei

Thanks a lot Slief,

I cleaned the pump.
the manual I have says that the 75Watts RD3 has a additional axial floating bearing on the rear shaft but I did not find it.
I found a teflon white ring in the container after I pulled the rotor out.
I am not sure if it is installed instead of the bearing and if I installed it correctly.
here is the photo

Attachment 388967
can you confirm that this teflon white ring should be installed there on the rear shaft please

That is correct. There is no bushing on that pump. Just the teflon washer you have in your photo.