High-Quality Slewing Bearings | Precision and Durable Solutions-LYNBC

Slewing Bearings Overview

Configure

The slewing bearing, also called a turntable bearing, can be provided with various types and sizes of holes. Also, it is available in different configurations, such as internal gear, external gear, and gearless types. Special double row and triple row configurations are also provided so as to meet individual demands.

Structures

The slewing bearing is a basic part for transmitting mechanical force between two parts on equipment that need relative rotation under the axial force,radial force and tilting moment at the same time. lt is often fastened on the upper and lower supports of the mechanical equipment by bolt. Designed with mounting holes, internal or external gear, lubricating holes and sealing device, this type of rolling element bearing owns compact structure with high rigidity. It features light weight, steady operation, high precision, safety and other characteristics.

Application

Involved in a large range of applications, the slewing bearing is a commonly seen bearing for construction machinery. To illustrate, it is often applied on cranes, cement pump track, road roller. wind turbine, solar power generating equipment. tidal power equipment, ship unloading machine, ladle turret, stacker-reclaimer, radar tank, satellite launcher, ferris wheel, CT machine, and more. In addition, our slewing bearing has a wide customer base in China and other countries, like America,Germany, India,South Korea, Japan,Singapore, Peru,ltaly, etc.

Type

We can provide many kinds of slewing bearings, such as :

1. Four point contact ball slewing bearings;

2. Double-row ball slewing bearings;

3.Three-row cylindrical roller slewing bearings;

4. Crossed roller slewing bearings;

5.INA Crossed roller slewing bearings;

6.INA Light Series Four point contact ball slewing bearings;

7.INA Four point contact ball slewing bearings.

Customizable

As a professional slewing bearing manufacturer in China, we can produce slewing bearings of different sizes, from small size (D=300mm) to large size (D=120000mm), including internal gear, external gear, no gear and other types.

Technical Support

We can also provide consultation for customers as well as design specific slewing bearing according to your requirements. Meanwhile, we also provide thrust bearings, roller bearings, angular contact ball bearings, deep groove ball bearings and other bearings. lf you are in need of slewing bearings or other bearings, please contact us.

Slewing Bearings Features

Load Handling Capability

Designed to support axial, radial, and tilting moment loads simultaneously.

Available in different load capacities depending on the application.

Compact & Space-Saving Design

Integrates both bearing and gear functionality, reducing the need for additional components.

Compact structure allows for easy installation in tight spaces.

High Precision & Smooth Rotation

Precision-engineered to ensure smooth and controlled rotation.

Some models include preloaded rolling elements for enhanced stability.

Multiple Configurations

Single-row ball bearings: Light-duty applications.

Double-row ball bearings: Increased load capacity.

Three-row roller bearings: Heavy-load applications.

Cross-roller bearings: High precision and rigidity.

Wire-race bearings: Lightweight and flexible applications.

Integrated Gear Options

Available with internal, external, or no gearing for drive systems.

Facilitates easy integration with motors and gear mechanisms.

Sealing & Protection

Equipped with seals to prevent contamination from dust, water, and other particles.

Ensures longer service life with minimal maintenance.

Durable Materials & Coatings

Made from high-strength alloy steels for enhanced durability.

Optional corrosion-resistant coatings for harsh environments.

Lubrication & Maintenance

Designed for grease or oil lubrication to reduce friction and wear.

Some models come with self-lubricating features or lubrication ports for easy servicing.

Wide Application Range

Used in construction equipment, wind turbines, medical devices, industrial robots, and more.

Installation Guide

Safety First

Personal Protective Equipment (PPE): Wear appropriate PPE, including safety glasses, gloves, steel-toed boots, and hearing protection (if necessary).

Qualified Personnel: Slewing bearing installation should be performed by qualified and experienced technicians.

Lifting Equipment: Use properly rated and inspected lifting equipment. Ensure the equipment is suitable for the weight and size of the bearing. Inspect lifting slings and chains for wear and damage before each use.

Lockout/Tagout: If the machine where the slewing bearing is being installed requires it, follow proper lockout/tagout procedures to prevent accidental startup during installation.

Work Area Safety: Keep the work area clean, organized, and free from obstructions.

Receiving and Inspection

Unpack Carefully: Carefully unpack the slewing bearing, avoiding any impacts or shocks.

Inspect for Damage: Thoroughly inspect the bearing for any signs of damage during shipping (e.g., dents, scratches, rust, missing parts). Report any damage to the carrier immediately.

Verify Components: Check that all components listed on the packing list are present and in good condition. This may include mounting bolts, grease fittings, seals, and any special tools.

Identification: Verify the bearing model number and serial number match the order.

Storage: If the bearing is not to be installed immediately, store it in a clean, dry environment, protected from the elements. Keep the bearing horizontal and supported evenly to prevent distortion. Reapply protective grease if the factory coating is compromised.

Preparation

Cleanliness is Key: Thoroughly clean the mounting surfaces on both the support structure and the rotating structure. Remove any dirt, rust, burrs, weld spatter, or paint. Use appropriate solvents and cleaning tools.

Surface Flatness and Finish: Ensure the mounting surfaces meet the flatness and finish requirements specified by the bearing manufacturer. This is critical for even load distribution and preventing premature wear. Use a straight edge and feeler gauges to check flatness. Grind or machine surfaces as needed.

Bolt Hole Alignment: Verify that the bolt holes in the mounting structures align properly with the bolt holes in the slewing bearing. Use a template or alignment pins to check. Correct any misalignments.

Lubrication: If specified by the manufacturer, apply a thin layer of lubricating grease to the mounting surfaces to prevent fretting corrosion.

Installation Procedure

Positioning the Bearing: Carefully position the slewing bearing on the mounting structure. Use lifting equipment to avoid dropping or damaging the bearing. Align the bolt holes.

Bolt Installation:

Bolt Type: Use the correct type, grade, and size of mounting bolts as specified by the manufacturer. High-strength bolts are typically required.

Bolt Length: Ensure the bolt length is correct. The bolt should extend through the mounting structure and engage at least one diameter of thread in the nut. Use washers as needed to achieve the correct length.

Washer Usage: Use hardened washers under both the bolt head and the nut. The washer should be the correct size and material for the bolt.

Bolt Lubrication: Lubricate the bolt threads and under the bolt head/nut with a suitable anti-seize compound or lubricant. This ensures accurate torque values.

Tightening Sequence: Tighten the bolts in a star pattern or cross pattern to evenly distribute the load. Follow the manufacturer's recommended tightening sequence and number of passes.

Torque Values: Use a calibrated torque wrench and tighten the bolts to the specified torque values. Do not over-torque! Over-torquing can damage the bolts and the bearing.

Re-Torque: After the initial installation and a period of operation (e.g., 4-8 hours), re-torque the bolts to the specified value. This allows for seating and settling of the components.

Preload (If Required): Some slewing bearings require a specific preload. Follow the manufacturer's instructions for applying preload.

Sealing: Apply sealant (if required) to the mounting surfaces or bolt holes to prevent water or contaminants from entering the bearing. Use a sealant that is compatible with the bearing materials.

Lubrication

Grease Type: Use the grease type recommended by the bearing manufacturer. Using the wrong grease can damage the bearing.

Greasing Procedure:

Initial Greasing: Fill the bearing with grease through the grease fittings until grease is observed coming out of the seals. Slowly rotate the bearing while greasing to ensure even distribution of the grease.

Regular Greasing: Follow the manufacturer's recommended greasing intervals and amounts. Too much grease can be as harmful as too little.

Grease Fittings: Inspect grease fittings regularly for damage and replace as needed.

Testing and Operation

Smooth Rotation: After installation, check that the bearing rotates smoothly and without excessive noise or vibration.

Load Testing: If possible, perform load testing to verify the bearing's performance under load.

Monitoring: Monitor the bearing's temperature, noise, and vibration during operation. Report any unusual conditions to qualified personnel.

Documentation

Record Keeping: Maintain detailed records of the installation process, including:

Bearing model and serial number

Date of installation

Installer's name

Bolt torque values

Grease type and amount

Any issues encountered during installation

Slewing bearing maintenance

Slewing bearings are crucial components in various heavy machinery, enabling rotational movement under substantial loads. Proper maintenance is essential for their longevity and reliable performance.

Regular Inspection

Visual Checks

Look for cracks, corrosion, or damage on the bearing surface.

Inspect the seals for wear, tearing, or missing sections.

Ensure that bolts are tight and not loose or broken.

Lubrication Check

Verify the presence and condition of lubricant.

Check for contamination (dirt, metal particles, or water in the grease).

Rotation & Noise Monitoring

Slowly rotate the bearing and listen for abnormal noises (grinding, knocking).

Feel for irregular resistance or stiffness.

Lubrication

Grease Type & Interval

Use the manufacturer-recommended grease (typically lithium-based for general applications).

Apply fresh grease every 100-200 hours of operation or as recommended.

Lubrication Process

Inject grease evenly into all grease points while rotating the bearing slowly.

Wipe off excess grease and check for leakage.

Ensure new grease pushes out old grease and contaminants.

Bolt Tightening & Torque Checks

Regularly check bolt torque using a torque wrench.

Retighten bolts per the manufacturer’s torque specifications.

Replace any damaged or loose bolts immediately.

Seal Maintenance

Keep seals clean and free from debris.

Replace damaged seals promptly to prevent contamination.

Apply a protective coating if exposed to harsh environments.

Load Monitoring

Avoid exceeding the maximum load capacity.

Ensure proper load distribution to prevent premature wear.

Avoid shock loads or excessive vibrations.

Cleaning & Protection

Keep the area around the bearing free from dirt and debris.

If not in use for a long time, apply a protective coating or cover.

Bearing Wear Measurement

Use a dial indicator to check axial and radial movement.

Compare results to manufacturer’s allowable limits.

Replace the bearing if wear exceeds safe limits.

Record Keeping

Maintain a log of inspections, lubrication, and repairs.

Track any performance irregularities for early issue detection.

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