If there is possibility of non-coaxiality between the main shaft and the holder it is recommended to use bearings which are best in situation of wrong alignment. The best bearings are transverse self-aligning ball bearings, transverse roller bearings and thrust self-aligning roller bearings.

The reasons of bearings non-coaxiality can be for example bend of the main shaft because of big load, when bearings are placed on supports which are on two different and distant bases or when it was impossible to synchronize at the same time proper bearing’s cover in mounting.

Bearings of “Y” type have spherical outer ring in order to prevent from non-coaxiality during assembly stage. Non-coaxiality of this kind sometimes comes to being in agricultural machines.