Correct installation and use of joint bearings

- May 15, 2019-

In order to achieve maximum service life of spherical plain bearings and rod end joint bearings, there is no premature failure. Be careful when installing and keep clean.


Bearing and rod end joint bearings should be removed from the package just before installation to avoid contamination. Use a clean cloth to wipe the bearing parts that may get dirty due to improper handling or damaged packaging.


The sliding contact surfaces of spherical plain bearings must be matched to ensure good friction and wear characteristics. Therefore, any change in the sliding contact surface can shorten the bearing life. The above changes also include cleaning the sliding contact surface or contacting the solvent, detergent, oil or similar medium.


Spherical plain bearing


When installing a spherical plain bearing with a split outer ring or a split outer ring, pay attention to the position of the joint at 90° to the direction of the load, otherwise the service life will be shortened. Steel or plastic fastening straps used to secure the outer ring of spherical plain bearings must not be removed prior to installation. The fastening strip is located in the annular groove and does not protrude from the outer surface of the bearing. Spherical plain bearings with axially split and bolted outer rings must be installed in this manner and must not be loosened.


The following tools are suitable for mounting spherical plain bearings:


One installation of an impact ring or a length of pipe; usually, the impact ring should be installed first with interference fit


An impact ring with two shoulder surfaces for mounting the bearing to the shaft and housing simultaneously

If the number of bearings is large, a suitable tool can be used in combination with the press.


Rod end joint bearing:


The rod end joint shaft is equipped with a pin and a shaft like a spherical plain bearing. Slight heating can reduce the required mounting force and reduce the risk of damage to the relevant components.


When fixing the rod end joint bearing to the threaded rod or extension tube, the countersunk lock nut should be used on the external thread of the rod or rod end joint bearing. The countersunk lock nut should be fastened against the shoulder end of the rod end joint bearing or tube.