The slewing bearing on the 306E serves three essential mechanical functions:
Connection and Load Support:
It acts as the structural connection between the upper frame (house) and the undercarriage.
Its primary role is to support the entire weight of the upper structure, including the cab, engine, counterweight, and the attachment system (boom, arm, and bucket).
It withstands immense axial loads (vertical forces), radial loads (sideways forces), and moment loads (tilting forces) generated during digging, lifting, and swinging operations.
Enabled 360-Degree Rotation:
It provides the low-friction rotational axis that allows the upper structure to swing or slew a full 360 degrees continuously and smoothly.
This rotation is powered by the hydraulic swing motor, whose pinion gear engages with the internal gear teeth of the slewing bearing.
This 398-9799 slewing bearing is used for 306E2 306E 305.5E 305.5E2 excavator.
Related part number:
3B-8488
5P-4400
175-1586
398-9799
425-2867
095-1298
126-2565
5P-4423
7X-2555
205-6079
205-6079
