Double-Row Ball Slewing Bearings

Key Parameters

Product Type: Double-Row Ball Slewing Bearings

Structure: Three seat rings with two rows of balls

Gear Options: 020 without gear; 021/022 external gear; 023/024 internal gear

Dimension Range D: 616–4778 mm; d: 384–4222 mm; H: 106–226 mm

Reference Weight: 100–4700 kg

Main Loads: High axial load and tilting moment; radial loading requires application-specific verification

Typical Applications: Medium-diameter tower cranes, truck-mounted cranes, and loading/unloading machinery

Double-row ball slewing bearings consist of three seat rings. Balls and spacers can be inserted directly into the upper and lower raceways, with different ball diameters selected according to the load distribution. The open assembly simplifies installation and service, while the 90° load angle of the upper and lower circular-arc raceways enables high axial-load and overturning-moment capacity.

When the radial load exceeds 0.1 times the axial load, the raceway requires a special design. With a robust structure and relatively large axial and radial section, this series is especially suitable for medium- and large-diameter tower cranes, truck-mounted cranes, and loading/unloading machinery.

Product Features

High Load Capacity:

Two ball rows share the load and provide high axial-load and overturning-moment capacity.

Robust Construction:

Three seat rings and separate upper/lower raceways form a rigid load-carrying structure.

Convenient Assembly:

Balls and spacers can be inserted directly into the raceways for easier assembly, inspection, and service.

Multiple Gear Options:

Available in non-geared, external-geared, and internal-geared configurations for different drive layouts.

Models are grouped by Series 02 and by non-geared, external-geared, or internal-geared construction. Selection should verify overall, mounting and structural dimensions, gear data, reference weight, and actual operating loads. Gear data applies only to the corresponding geared variants; non-geared models do not use gear parameters.

Installation and Service Notes

Mounting Surfaces:

Mounting surfaces should provide adequate rigidity and flatness to prevent ring deformation.

Bolted Joint:

Tighten mounting bolts in a cross pattern to the specified torque and recheck them during initial operation.

Lubrication:

Lubrication-hole quantity and position can be adapted to the application; select grease and relubrication intervals according to operating conditions.

Gear Mesh:

For geared versions, verify backlash, contact pattern, and pinion alignment.