Atlas Copco Drive Shaft Bearing Kit Replacement – 2906045300

The Atlas Copco 2906045300 is a drive shaft bearing service kit designed to support and correctly align the rotating drive shaft in applicable ZR300–425 oil-free compressors. The bearing reduces friction between rotating and stationary components while maintaining accurate shaft positioning during continuous operation.

Working Process

1. Drive Power – The drive system transfers rotational power to the compressor shaft.
2. Shaft Rotation – The drive shaft rotates continuously during compressor operation.
3. Bearing Support – The bearing supports the shaft and maintains its correct position.
4. Friction Reduction – The bearing allows smooth shaft rotation while reducing friction.
5. Load Distribution – Operating loads are transferred through the bearing to the surrounding housing.
6. Sealing & Retention – The O-ring and circlips help retain and seal the bearing assembly.
7. Wear Over Time – Continuous rotation, load and temperature can eventually cause bearing wear.
8. Bearing Replacement – During maintenance, the worn bearing is replaced using 2906045300.
9. Testing – After reassembly, shaft rotation, vibration, temperature and noise are checked.

Kit Components

Atlas Copco’s official listing specifies:

Kit weight: approximately 9.95 kg according to Atlas Copco’s official listing.

Main Functions

• Supports the compressor drive shaft.
• Maintains shaft alignment.
• Reduces rotational friction.
• Helps distribute shaft loads.
• Replaces worn bearing components.
• Helps prevent excessive shaft vibration.
• Restores reliable drive-shaft operation.

Typical Failure Symptoms

A worn drive-shaft bearing may cause:

• Increased vibration.
• Abnormal bearing noise.
• Increased bearing temperature.
• Shaft misalignment.
• Increased mechanical friction.
• Premature wear of related components.
• Reduced compressor reliability.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate and lock out the electrical supply.
3. Fully depressurize the compressor.
4. Allow the equipment to cool.
5. Access the drive-shaft bearing assembly.
6. Remove the retaining circlip.
7. Remove the existing bearing.
8. Inspect the shaft, housing and sealing surfaces.
9. Clean the mating surfaces.
10. Install the new bearing from 2906045300.
11. Replace the O-ring.
12. Install the supplied circlip and external circlip correctly.
13. Verify correct bearing seating and shaft alignment.
14. Reassemble the drive-shaft assembly.
15. Rotate/check the shaft for smooth movement.
16. Restart the compressor.
17. Monitor vibration, bearing temperature and noise.
18. Confirm normal compressor operation.

Technical Summary

Recommended catalog title:
Atlas Copco 2906045300 – ZR300–425 Drive Shaft Bearing Kit, 2906-0453-00.

Atlas Copco’s official listing confirms the kit and its four components: bearing, circlip, O-ring and external circlip.

Compatibility note: Verify the compressor model and serial number before ordering. Parts references specifically associate 2906045300 with the ZR300, ZR315, ZR355, ZR400 and ZR425 range.