What bearings are used in cranes?

Cranes are indispensable in construction, port, and heavy industrial lifting operations. Their ability to bear enormous loads and rotate smoothly largely depends on a key component—bearings. Bearings ensure stable movement, precise 360° rotation, and reliable operation of cranes under complex working conditions.

What types of bearings are used in cranes?

Different types of cranes and applications require different bearings to withstand specific loads and motion patterns. The most commonly used bearings in cranes include:

Slewing bearings (turntable bearings)—These large-diameter bearings are installed between the crane's superstructure and chassis. They can simultaneously withstand axial, radial, and moment loads, enabling smooth rotation of the crane during lifting operations.

Cylindrical roller bearings—Commonly used in hoisting mechanisms and motors, they can withstand high radial loads and ensure stable speed control.

Ball roller bearings—Suitable for components susceptible to misalignment or vibration, they offer self-aligning capability and excellent durability.

Thrust ball bearings—Used in hoisting and slewing gear systems where axial loads dominate, they contribute to smooth and controllable vertical movement.

The Importance of Crane Slewing Bearings

Crane slewing bearings, installed between the upper and lower frames, are the core component for achieving smooth rotation. They bear all the working loads of the crane structure, including lifting torque and lateral forces, and maintain stability during 360° rotation.

Different slewing bearing structures are used depending on the crane type:

Single-row ball bearings are suitable for compact cranes or light-load applications.

Double-row ball bearings are suitable for applications requiring higher stability and load capacity.

Crossed roller bearings are suitable for precision applications where rigidity and space utilization are critical.

High-quality crane slewing bearings ensure smooth rotation, high positioning accuracy, and safe operation under heavy-duty lifting conditions.

Key Features of Crane Slewing Bearings

High Load Capacity – Designed to withstand axial, radial, and overturning moment loads simultaneously.

Compact Design – Integrates rotation and support functions into a single component, saving space and reducing weight.

Smooth Rotation – Precision-ground raceways ensure minimal friction and noise.

Corrosion and Dust Protection – Seals effectively prevent the ingress of water, dust, and other contaminants.

Customizable Options – Models with internal gears, external gears, or without gears are available to meet design requirements.

These features make slewing bearings an indispensable component of cranes, ensuring safety, precision, and durability in harsh working environments.

How to Maintain Crane Slewing Bearings

Proper maintenance is key to extending bearing life and preventing costly downtime:

Regular Lubrication: Use the correct type of grease and replenish it regularly according to operating intensity.

Check Bolt Tightness: Regularly check mounting bolts to avoid uneven load distribution.

Check Seals: Damaged seals can lead to contamination or grease leakage.

Monitor Rotation: Pay attention to any unusual sounds or vibrations to detect signs of wear early.

Rust Prevention: In outdoor or marine environments, apply an anti-corrosion coating for enhanced protection.

LTZC's Advantages as a Slewing Bearing Manufacturer

As a professional slewing bearing manufacturer, LTZC focuses on providing high-performance crane bearings suitable for various working conditions. Our products are widely used in mobile cranes, tower cranes, port cranes, and offshore lifting equipment.

Reasons to Choose LTZC:

Over 20 years of experience in designing and manufacturing precision slewing bearings.

Advanced production equipment and 100% process control ensure consistent product quality.

Strict inspection standards ensure high precision, durability, and safety.

Customizable bearing structures and gear configurations.

Global after-sales support and expert selection guidance.

LTZC's crane slewing bearings combine reliability, precision, and performance, helping customers reduce maintenance costs and maximize equipment uptime.

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