JCB slewing ring bearing Four point contact ball slewing ring
– without gear
– with external gear
– with internal gear
JCB slewing ring bearing Crossed roller slewing rings
– without gear
– with external gear
– with internal gear
JCB slewing ring bearing Special axial-radial roller slewing ring
– Triple row
（1） without gear （2）with external gear （3）with internal gear
– Double row
（1） without gear （2）with external gear （3）with internal gear