Atlas Copco Drive Shaft Seal Ring Kit Replacement – 2906042000

The Atlas Copco 2906042000 is a drive shaft seal ring kit used to service the sealing arrangement around the rotating drive shaft of applicable ZR-series oil-free compressors.

The seal ring forms a controlled sealing interface around the rotating shaft, helping prevent lubricant leakage from the drive/gear housing and maintaining proper internal sealing during continuous compressor operation.

Working Process

1. Drive Power – The drive system transfers rotational power to the compressor shaft.
2. Continuous Shaft Rotation – The drive shaft rotates continuously during compressor operation.
3. Seal Ring Contact – The seal ring maintains a controlled sealing interface around the rotating shaft.
4. Leak Prevention – The sealing arrangement prevents lubricant from escaping through the shaft opening.
5. Pressure Containment – Proper sealing helps maintain the required conditions inside the drive/gear housing.
6. Wear Over Time – Rotation, temperature and operating conditions gradually wear the seal ring.
7. Seal Replacement – During scheduled maintenance, the worn sealing components are replaced with the applicable 2906042000 kit.
8. Testing – After reassembly, the compressor is checked for leakage and abnormal vibration/noise.

Main Functions

• Replaces worn drive-shaft sealing components.
• Helps prevent lubricant leakage.
• Maintains proper drive-housing sealing.
• Supports reliable rotating-shaft operation.
• Protects nearby components from oil contamination.
• Restores sealing performance during compressor maintenance.

Typical Failure Symptoms

A worn drive-shaft seal ring may result in:

• Oil/lubricant leakage around the drive shaft.
• Oil contamination around the housing.
• Loss of proper housing sealing.
• Increased maintenance requirements.
• Possible abnormal noise or vibration if associated components are damaged.

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 seal assembly.
6. Remove the existing seal-ring components.
7. Inspect the shaft and sealing surfaces for wear or damage.
8. Clean the mating surfaces.
9. Install the replacement components supplied with 2906042000.
10. Ensure the seal ring is correctly positioned and seated.
11. Reassemble the drive-shaft assembly.
12. Restore all connections.
13. Restart the compressor.
14. Check the drive-shaft area for lubricant leakage.
15. Monitor vibration and abnormal noise.
16. Verify normal compressor operation.

Technical Summary

Recommended catalog title:
Atlas Copco 2906042000 – ZR300–750 Drive Shaft Seal Ring Kit, 2906-0420-00.

A parts catalog lists 2906041800, 2906041900 and 2906042000 as successive drive-shaft seal ring kits, while another parts reference specifically identifies 2906 0420 00 as the ZR300–750 Drive Shaft Seal Kit.

Compatibility note: Confirm the compressor model and serial number before ordering, because the closely related 2906041800/2906041900/2906042000 seal kits are used for different equipment configurations.