A high quality thrust boom slewing bearing is installed on the boom base structure, which is attached to the machine support frame.
Boom rotation is carried out by means of a hydraulic motor coupled with a planetary gear. This gear drives the rotation through the driving pinion to the slewing boom bearing. The boom base and slewing drive are designed to ensure rigidity of the entire base, torsional strength and excellent stability of the entire machine.
On Imer mixer pumps the boom rotation, as an optional accessory, can be continuous (multi-turn) when equipped with a hydraulic rotary clutch .