Atlas Copco HP Compressor Element Exchange Kit Replacement – 2906043900

The Atlas Copco 2906043900 HP Compressor Element Exchange Kit is a service kit used during replacement of the high-pressure (HP) compressor element. The HP element performs the second stage of compression, receiving pre-compressed air from the LP stage and increasing it to the required final pressure. A government procurement record also identifies 2906043900 as the HP Element Exchange Kit for an Atlas Copco ZA-6 compressor system.

Working Process

1. Air Intake – Atmospheric air enters the compressor.
2. LP Compression – The low-pressure element performs the first compression stage.
3. Intercooling – The partially compressed air is cooled before entering the HP stage.
4. HP Compression – The HP compressor element further compresses the air.
5. Element Exchange – During major maintenance, the worn HP element is replaced using the exchange kit.
6. Sealing & Alignment – The kit’s service components help achieve proper sealing and alignment.
7. Final Compression – The HP stage delivers compressed air toward the aftercooler and outlet system.
8. Continuous Operation – The two-stage oil-free compression process repeats during operation.

Main Functions

• Supports HP compressor-element replacement.
• Helps restore compression performance.
• Provides required service/sealing components.
• Helps maintain proper element alignment.
• Reduces the possibility of compressed-air leakage.
• Supports reliable two-stage oil-free compression.
• Helps reduce maintenance downtime.

Possible Failure Symptoms

A worn HP element or deteriorated sealing components can contribute to:

• Reduced discharge pressure.
• Reduced air delivery.
• Increased energy consumption.
• Abnormal vibration.
• Excessive compressor noise.
• Increased operating temperature.
• Reduced compression efficiency.
• Compressor performance alarms.

Maintenance / Exchange 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. Remove the required HP-stage covers and connections.
6. Disconnect and remove the existing HP element.
7. Inspect the element housing, shaft and mounting surfaces.
8. Clean the mating surfaces.
9. Install the replacement HP element.
10. Replace the applicable sealing and mounting components supplied with 2906043900.
11. Check shaft alignment and free rotation.
12. Tighten mounting hardware according to the applicable Atlas Copco specifications.
13. Reconnect air and service connections.
14. Restart the compressor.
15. Check for leakage, abnormal noise and vibration.
16. Verify discharge pressure, temperature and overall compressor performance.

Technical Summary

Recommended catalog title:
Atlas Copco 2906043900 – HP Compressor Element Exchange Kit for Z-Series Oil-Free Compressors, 2906-0439-00.

Related part: 2906043800 is listed as the corresponding LP Compressor Element Exchange Kit, while 2906043900 is the HP version.

Compatibility note: Verify the exact compressor model and serial number before ordering, because the same kit family can appear across different Z-series configurations.

Disclaimer: All manufacturer names, trademarks, model numbers, and part numbers are used solely for identification and compatibility purposes. Our products are high-quality aftermarket replacement products and are not manufactured, sponsored, endorsed, or authorized by the original equipment manufacturer (OEM). All trademarks remain the property of their respective owners.