Hello everyone, I have a P305 line pump. The question I have is I'm coming close to finishing up the rebuild and I noticed today the the S tube is slower to slew to the left at the end of the slew it moves slowly were as not on the right side its a solid change to the right, have you any idea where to start to see what is causing this, I loosened the shaft nut to just below hand tight to see if it stopped the issue but sadly not, any tips would be much appreciated, I have attached a video to show you. Thanks in advance for any help

Anybody any ideas??