Atlas Copco IMD 400 Rotor Inspection Kit Replacement – 2906081800

Atlas Copco 2906081800 – IMD 400 Rotor Inspection Kit

The Atlas Copco 2906081800 (2906-0818-00) is an IMD 400 Rotor Inspection Kit designed for inspection and servicing of the rotor assembly in compatible Atlas Copco compressor systems.

The kit is associated with the IMD 400 system and is intended to support rotor inspection or rotor-exchange work. The kit contains replacement sealing components required when the rotor assembly is opened and serviced.

Atlas Copco’s official catalog lists the complete kit weight as 400 g.

Working Process:

During normal operation, the compressor’s rotor assembly operates continuously to perform its designed mechanical function. Correct rotor condition and sealing are essential for maintaining reliable compressor performance.

During scheduled maintenance or when rotor condition needs to be checked, the compressor is stopped, isolated and depressurized.

The IMD 400 rotor assembly is then accessed according to the applicable Atlas Copco service procedure.

The rotor and associated sealing surfaces are inspected for signs of:

• Wear
• Damage
• Contamination
• Seal deterioration
• Abnormal surface condition
• Leakage
• Mechanical irregularities

When the rotor is inspected or exchanged, the sealing components supplied in the 2906081800 Rotor Inspection Kit are used to restore the required sealing condition during reassembly.

The new seals, O-rings, sealing ring, seal lip and gasket prevent unwanted leakage after the serviced rotor assembly is returned to operation.

Official Kit Components:

Atlas Copco’s official catalog lists the following components for 2906081800:

• O-ring 92 × 3 – 2 pcs
• Gasket Type 1, 80 × 128 × 2 – 1 pc
• Seal – 1 pc
• O-ring – 1 pc
• Sealing Ring MD50/100 – 1 pc
• Seal Lip – 1 pc

The complete kit has an official listed weight of 400 g.

Component Functions:

The O-rings provide sealing between mating components and help prevent leakage around the serviced rotor assembly.

The gasket provides sealing between mating surfaces when the relevant assembly is reinstalled.

The seal provides a dedicated sealing interface around the rotor or associated rotating assembly.

The sealing ring MD50/100 provides additional sealing around the applicable rotor assembly interface.

The seal lip is designed to maintain sealing around a moving/rotating interface and helps prevent leakage during operation.

Rotor Inspection Process:

1. Shutdown: Stop the compressor according to the applicable operating procedure.
2. Isolation: Isolate the electrical and pneumatic/pressure sources.
3. Depressurization: Ensure the system is completely depressurized before maintenance.
4. Access: Remove the required covers and components to access the IMD 400 rotor assembly.
5. Inspection: Examine the rotor and associated components for wear, damage and abnormal conditions.
6. Seal Inspection: Check O-rings, gaskets, seals and sealing surfaces.
7. Rotor Service/Exchange: Inspect, service or exchange the rotor as required.
8. Seal Replacement: Replace the applicable sealing components using the 2906081800 kit.
9. Reassembly: Reassemble the rotor assembly according to Atlas Copco service instructions.
10. Leak Check: Verify that the serviced assembly is properly sealed.
11. Restart: Return the compressor to operation after completing all required checks.
12. Performance Verification: Monitor the compressor for abnormal leakage, noise or operating behavior.

Importance of the Kit:

A rotor inspection requires the serviced assembly to be opened and subsequently reassembled.

Reusing old sealing components after disassembly can result in leakage because seals and gaskets may lose their original elasticity, shape or sealing characteristics.

The 2906081800 kit provides the replacement sealing components required for the IMD 400 rotor inspection/rotor-exchange procedure.

Using new sealing components during reassembly helps maintain the intended sealing performance of the rotor assembly.

Possible Problems Requiring Rotor Inspection:

Rotor inspection may be required when maintenance personnel identify:

• Abnormal operating noise
• Excessive vibration
• Seal leakage
• Reduced equipment performance
• Unusual temperature behavior
• Visible contamination
• Worn sealing components
• Suspected rotor damage
• Abnormal mechanical condition

The exact diagnostic criteria depend on the specific IMD 400 installation and applicable Atlas Copco maintenance instructions.

Maintenance Procedure:

Before beginning work, stop and isolate the compressor and ensure that all relevant pressure and energy sources have been safely isolated.

Open the assembly according to the applicable Atlas Copco service documentation.

Inspect the rotor, sealing surfaces and associated components.

Remove old O-rings, gaskets and seals carefully.

Clean the relevant mating and sealing surfaces without damaging precision surfaces.

Install the replacement components supplied in the 2906081800 IMD 400 Rotor Inspection Kit.

Ensure that:

• O-rings are correctly seated.
• O-rings are not twisted or damaged.
• The gasket is correctly positioned.
• The sealing ring is correctly installed.
• The seal lip is correctly oriented.
• Sealing surfaces are clean.
• The rotor assembly is correctly positioned.
• All retaining components are correctly secured.

After reassembly, perform the applicable leak and operational checks.

Restart the equipment according to the manufacturer’s procedure and monitor the serviced assembly for:

• Leakage
• Abnormal noise
• Abnormal vibration
• Unusual temperature
• Correct operating performance

A properly completed rotor inspection and reassembly helps maintain the mechanical integrity and sealing performance of the IMD 400 system.

Part Number: 2906081800
Alternative Number: 2906-0818-00 / 2906 0818 00
Brand: Atlas Copco
Official Description: IMD 400 Rotor Inspection Kit
Application: IMD 400 compressor system
Kit Type: Rotor inspection / rotor-exchange service kit
Official Listed Weight: 400 g
Primary Function: Provides replacement sealing components for IMD 400 rotor inspection/service
Main Components: O-rings, gasket, seal, sealing ring and seal lip
Service Function: Supports rotor inspection, servicing and reassembly
Main Benefits: Restored sealing performance, reduced leakage risk, reliable rotor reassembly and dependable compressor operation.

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