Atlas Copco Drive Shaft Seal Kit Replacement – 2906041800

The Atlas Copco 2906041800 is a drive shaft seal kit used to service the drive-shaft sealing arrangement in applicable ZR/ZT oil-free compressors. The seal assembly prevents compressed-air or lubricant leakage around the rotating drive shaft and maintains the integrity of the compressor drive system.

The official Atlas Copco listing gives the kit weight as approximately 1.66 kg.

Working Process

1. Drive Transmission – The drive system rotates the compressor shaft.
2. Shaft Rotation – The drive shaft operates continuously while the compressor is running.
3. Sealing – The shaft seal creates a controlled sealing interface around the rotating shaft.
4. Leak Prevention – The seal prevents unwanted leakage through the shaft housing.
5. Service Wear – Continuous rotation and operating conditions eventually cause seal components to wear.
6. Seal Replacement – During maintenance, the worn seal assembly and associated sealing components are replaced with 2906041800.
7. Reassembly – The drive shaft assembly is correctly reassembled.
8. Testing – The compressor is restarted and the serviced area is checked for leakage and abnormal operation.

Kit Components

Atlas Copco officially lists:

A ZT110–145 parts reference also identifies the kit as the drive shaft seal kit and associates it with the outer and inner seal rings of the drive-shaft assembly.

Main Functions

• Replaces worn drive-shaft sealing components.
• Prevents leakage around the rotating drive shaft.
• Maintains proper sealing of the drive assembly.
• Supports reliable ZR/ZT compressor operation.
• Helps protect surrounding components from leakage.
• Restores the sealing performance of the drive-shaft assembly.

Typical Failure Symptoms

A worn drive-shaft seal may cause:

• Oil or lubricant leakage around the shaft area.
• Air leakage.
• Increased contamination around the drive housing.
• Abnormal noise or vibration if the seal becomes damaged.
• Deterioration of nearby 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 assembly.
6. Remove the existing sealing components.
7. Inspect the shaft and sealing surfaces for wear or damage.
8. Clean the mating surfaces.
9. Install the new O-ring, seal assembly and washers supplied with 2906041800.
10. Ensure the seal is correctly positioned and seated.
11. Reassemble the drive-shaft components.
12. Restore the compressor connections.
13. Restart the compressor.
14. Inspect the serviced area for leakage.
15. Check vibration and abnormal noise.
16. Verify normal compressor operation.

Technical Summary

Recommended catalog title:
Atlas Copco 2906041800 – Drive Shaft Seal Kit for ZR/ZT Oil-Free Compressors, 2906-0418-00.

Atlas Copco’s official product page confirms the Drive Shaft Seal Kit for Oil-Free Compressors, while the ZT110–145 parts documentation specifically associates 2906 0418 00 with the drive-shaft seal arrangement.

Important: Verify the compressor model and serial number before ordering, because related drive-shaft kits such as 2906041300 (bearing kit) and other seal kits are used on different ZR/ZT configurations.