Atlas Copco LP Compressor Element Exchange Kit Replacement – 2906048400

The Atlas Copco 2906048400 LP Compressor Element Exchange Kit is used for servicing or replacing the low-pressure (LP) compressor element in applicable ZR450–750 oil-free compressors. The LP element performs the first stage of compression before the air proceeds through the intercooling system and then to the high-pressure stage.

The exchange kit provides the necessary service components required to install the replacement LP element correctly, helping maintain proper sealing, alignment and reliable compressor performance.

Working Process

1. Air Intake – Atmospheric air enters the compressor.
2. LP Compression – The LP compressor element compresses the incoming air.
3. Intercooling – The partially compressed air is cooled before entering the next compression stage.
4. Element Exchange – During major maintenance, the worn LP element is removed and replaced.
5. Sealing – Replacement sealing components help prevent compressed-air leakage.
6. Alignment – Correct installation maintains proper shaft and element alignment.
7. HP Compression – The cooled air continues to the high-pressure element.
8. Final Air Delivery – The compressed air proceeds through the aftercooling and outlet system.

Main Functions

• Supports replacement of the LP compressor element.
• Restores first-stage compression performance.
• Provides required exchange/service components.
• Helps maintain correct element alignment.
• Helps prevent compressed-air leakage.
• Supports efficient two-stage oil-free compression.
• Reduces downtime during major compressor maintenance.

Possible Failure Symptoms

A worn LP element or damaged installation components may contribute to:

• Reduced air output.
• Reduced discharge pressure.
• Increased energy consumption.
• Abnormal vibration.
• Unusual 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 LP-stage covers and connections.
6. Disconnect and remove the existing LP element.
7. Inspect the housing, shaft and mounting surfaces.
8. Clean all mating surfaces.
9. Install the replacement LP element.
10. Install the applicable components supplied with 2906048400.
11. Check all seals and connections for correct seating.
12. Verify shaft alignment and free rotation.
13. Tighten mounting hardware according to the applicable Atlas Copco specifications.
14. Reconnect the air and service connections.
15. Restart the compressor.
16. Check for air leakage, abnormal vibration and noise.
17. Verify pressure, temperature and overall compressor performance.

Technical Summary

Recommended catalog title:
Atlas Copco 2906048400 – ZR450–750 LP Compressor Element Exchange Kit, 2906-0484-00.

Related Parts

• 2906048500 – HP Compressor Element Exchange Kit
• 2906048600 – Gear Casing Seal Kit
• 2906048800 – Intercooler Service Kit
• 2906048900 – Aftercooler Kit

These parts appear sequentially in Atlas Copco parts references for the same compressor family.

Compatibility: Verify the exact compressor model and serial number before ordering, as the LP element exchange kit is specifically associated with the ZR450–750 range.