Atlas Copco MD1800–2500W Rotor Exchange Kit Replacement – 2906055400

The Atlas Copco 2906055400 is a Rotor Exchange Kit designed for servicing the rotor assembly in MD1800–2500W equipment. The rotor is a critical rotating component of the dryer/air-treatment system, and its condition directly affects the equipment’s drying and regeneration performance. Atlas Copco identifies this part specifically as an MD1800-2500W Rotor Exchange Kit.

During operation, the rotor rotates through the drying and regeneration sections of the equipment. It transfers moisture from the compressed-air stream during the adsorption phase and releases the accumulated moisture during regeneration. Replacing the rotor restores the required moisture-transfer performance.

Working Process

1. Compressed Air Entry – Wet compressed air enters the MD dryer.
2. Drying Phase – The rotor’s drying material removes moisture from the compressed air.
3. Rotor Rotation – The rotor continuously moves between the drying and regeneration zones.
4. Moisture Transfer – Moisture collected during the drying phase is carried toward the regeneration section.
5. Regeneration – Heated or appropriately conditioned air removes the accumulated moisture from the rotor.
6. Moisture Exhaust – The removed moisture is discharged from the system.
7. Rotor Returns – The regenerated portion of the rotor returns to the drying zone.
8. Continuous Cycle – This process repeats continuously to provide consistent dry compressed air.

Main Functions

• Provides a replacement rotor for MD1800–2500W equipment.
• Restores moisture-adsorption performance.
• Supports continuous drying operation.
• Helps maintain required compressed-air dew point.
• Reduces the risk of moisture carryover.
• Restores dryer efficiency after rotor wear or deterioration.
• Supports reliable long-term air-treatment operation.

When Rotor Exchange May Be Required

A rotor exchange may be required when there is:

• Reduced drying performance.
• Increased outlet dew point.
• Moisture carryover.
• Deterioration of the rotor material.
• Excessive pressure drop.
• Physical damage to the rotor.
• Reduced regeneration efficiency.
• Increased operating energy consumption.

Rotor Exchange Procedure

1. Shut down the MD dryer according to the applicable Atlas Copco service procedure.
2. Isolate the electrical and compressed-air supplies.
3. Fully depressurize the equipment.
4. Allow hot components to cool.
5. Open the required service/access sections.
6. Inspect the existing rotor and surrounding components.
7. Remove the old rotor assembly according to the service manual.
8. Inspect the shaft, bearings, seals and mounting surfaces.
9. Clean the relevant areas.
10. Install the replacement rotor from 2906055400.
11. Ensure the rotor is correctly aligned and positioned.
12. Check that the rotor rotates freely.
13. Reassemble the dryer.
14. Restore the air and electrical connections.
15. Restart the equipment.
16. Check for abnormal noise, vibration or leakage.
17. Verify drying performance and outlet dew point.

Technical Summary

A current Atlas Copco page confirms 2906055400 as the MD1800-2500W ROTOR EXCHGE KIT.

Recommended catalog title:
Atlas Copco 2906055400 – MD1800–2500W Rotor Exchange Kit, 2906-0554-00.

Compatibility note: Atlas Copco recommends verifying the exact machine configuration through the machine serial number and Spare Parts Book before ordering.