Atlas Copco HP Compressor Element Exchange Kit Replacement – 2906048500

The 2906048500 HP Compressor Element Exchange Kit is used during replacement or major servicing of the high-pressure (HP) compressor element in Atlas Copco ZR450–750 oil-free compressors. The HP element performs the second stage of compression, receiving air from the LP stage and increasing it to the required final pressure.

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 element further increases the air pressure.
5. Element Exchange – During major maintenance, the worn HP element is removed and replaced.
6. Sealing – Replacement seals and related components help prevent compressed-air leakage.
7. Alignment – Correct installation maintains proper shaft and element alignment.
8. Final Delivery – Compressed air proceeds to the aftercooling and outlet system.

Main Functions

• Supports HP compressor-element replacement.
• Restores HP-stage compression performance.
• Maintains proper element alignment.
• Helps prevent compressed-air leakage.
• Supports reliable two-stage oil-free compression.
• Reduces downtime during major compressor maintenance.

Possible Failure Symptoms

A worn HP element may contribute to:

• Reduced discharge pressure.
• Reduced air capacity.
• Increased energy consumption.
• Abnormal vibration or noise.
• Increased operating temperature.
• Reduced compression efficiency.
• Compressor performance alarms.

Maintenance / Exchange Procedure

1. Shut down and isolate the compressor.
2. Fully depressurize the system.
3. Allow the equipment to cool.
4. Remove the required HP-stage covers and connections.
5. Remove the existing HP compressor element.
6. Inspect the housing, shaft and mounting surfaces.
7. Clean all mating surfaces.
8. Install the replacement HP element and applicable components from 2906048500.
9. Replace required seals/gaskets.
10. Check shaft alignment and free rotation.
11. Tighten mounting hardware according to Atlas Copco specifications.
12. Reconnect all air and service connections.
13. Restart the compressor.
14. Check for leakage, vibration and abnormal noise.
15. Verify discharge pressure, temperature and overall performance.

Technical Summary

Recommended catalog title:
Atlas Copco 2906048500 – ZR450–750 HP Compressor Element Exchange Kit, 2906-0485-00.

The part-number sequence confirms 2906048400 = ZR450–750 LP Element Exchange Kit and 2906048500 = ZR450–750 HP Element Exchange Kit.

Important: For exact compatibility, verify the machine’s model and serial number. Atlas Copco recommends using the serial number in Power Connect to access the machine-specific Spare Parts Book.