Atlas Copco Shaft Seal Kit Replacement – 2906096800

Atlas Copco 2906096800 – Shaft Seal Kit

The Atlas Copco 2906096800 (2906-0968-00) is a Shaft Seal Kit used for servicing the shaft-sealing arrangement of compatible Atlas Copco rotary screw compressors.

The shaft seal is an important component that prevents lubricating oil from escaping along the rotating shaft while helping maintain the required separation between the lubricated compressor section and the external environment.

The kit is referenced for Atlas Copco GA-series compressors, including GA90 and GA160 configurations. Exact compatibility should be verified against the compressor model and serial number before installation.

Working Process:

During normal compressor operation, the compressor shaft rotates continuously to drive the compression element.

Because the shaft passes through a housing boundary, a sealing arrangement is required around the rotating shaft.

The shaft seal maintains contact with the appropriate rotating or stationary sealing surface and prevents compressor oil from escaping through the shaft opening.

The sealing arrangement also helps prevent contaminants from entering the compressor housing through the shaft interface.

As the compressor operates, the shaft seal is exposed to rotation, temperature, pressure differences and lubricating oil.

Over time, the sealing surface and associated components can wear or deteriorate.

When the seal reaches the end of its service life, the sealing performance decreases and oil leakage may occur.

During maintenance, the old shaft-seal components are removed and the sealing surfaces are inspected.

The 2906096800 Shaft Seal Kit is then installed according to the applicable Atlas Copco service procedure.

After correct installation, the new sealing components restore the required shaft-sealing performance.

When the compressor is restarted, the shaft rotates through the renewed sealing arrangement while the seal prevents excessive oil migration along the shaft.

Main Functions:

• Seals the rotating compressor shaft.
• Prevents lubricating-oil leakage.
• Helps maintain separation between internal lubricated areas and the external environment.
• Supports reliable compressor operation.
• Restores shaft-sealing performance during scheduled maintenance.
• Helps reduce oil contamination around the compressor drive/shaft area.
• Supports longer service life of the shaft-sealing assembly.

Operating Process:

1. Compressor Start: The compressor motor starts and drives the compressor element.
2. Shaft Rotation: The compressor shaft rotates continuously during operation.
3. Lubrication: Oil circulates through the lubricated compressor components.
4. Pressure Difference: Internal compressor pressure acts around the shaft-sealing area.
5. Sealing Action: The shaft-seal assembly maintains the required sealing interface around the rotating shaft.
6. Leakage Prevention: The seal restricts oil from passing through the shaft opening.
7. Continuous Operation: The sealing arrangement operates continuously while the shaft rotates.
8. Wear Over Time: Friction, temperature, pressure and operating hours can gradually deteriorate the sealing components.
9. Maintenance: When leakage or scheduled service indicates replacement, the shaft seal is removed.
10. Kit Installation: New sealing components from the 2906096800 kit are installed.
11. Inspection: Shaft and sealing surfaces are checked before final assembly.
12. Restart: The compressor is returned to operation and the shaft-seal area is monitored for leakage.

Importance of the Shaft Seal:

The shaft seal must maintain effective sealing while the shaft is rotating.

This makes the component particularly important because it must provide sealing without preventing normal shaft rotation.

A worn or damaged shaft seal can allow oil to migrate through the shaft opening.

If leakage continues, it can result in oil contamination around the compressor assembly and may contribute to reduced lubrication-system performance if the leakage becomes significant.

Possible Failure Conditions:

Long-term operation can cause the shaft seal to experience:

• Normal wear
• Seal-lip deterioration
• Hardening of sealing material
• Thermal degradation
• Surface damage
• Improper sealing
• Contamination
• Shaft-surface wear
• Incorrect installation

Typical symptoms of a deteriorated shaft seal may include:

• Oil leakage around the shaft area.
• Oil accumulation near the drive/shaft housing.
• Increased oil consumption.
• Visible oil contamination.
• Repeated leakage after cleaning.
• Reduced sealing performance.

A small amount of contamination around a shaft area should be diagnosed carefully because oil leakage can also originate from adjacent seals, gaskets, fittings or connections.

Maintenance Procedure:

Before servicing the shaft seal, stop the compressor, isolate the electrical supply and depressurize the equipment according to the applicable Atlas Copco safety procedure.

Allow hot components and lubricating oil to cool sufficiently before starting maintenance.

Inspect the shaft-seal area for signs of oil leakage.

Check:

• Shaft condition
• Seal seating surface
• Shaft sleeve condition, where applicable
• Seal housing
• Adjacent O-rings and gaskets
• Oil contamination
• Mechanical damage

Remove the existing shaft-seal assembly carefully.

Clean the sealing surfaces and inspect them for scratches, grooves, corrosion or excessive wear.

Install the replacement components supplied with the 2906096800 Shaft Seal Kit according to the applicable Atlas Copco service instructions.

Ensure that the seal is correctly oriented and seated.

Avoid damaging the sealing lip during installation.

Verify that the shaft rotates freely and that the seal is not incorrectly positioned.

After assembly, restart the compressor and allow it to reach normal operating conditions.

Inspect the shaft-seal area for:

• Oil leakage
• Abnormal temperature
• Abnormal noise
• Seal movement
• Oil accumulation

Continue monitoring after the compressor has operated under normal load.

A properly installed shaft seal restores the sealing barrier around the rotating shaft and helps prevent lubricating-oil leakage.

Service Benefits:

Using the Atlas Copco 2906096800 Shaft Seal Kit during appropriate maintenance helps:

• Restore shaft-sealing performance.
• Reduce oil leakage.
• Maintain proper oil containment.
• Protect surrounding compressor components from oil contamination.
• Support reliable compressor operation.
• Reduce the risk of continued leakage from a worn shaft-seal assembly.

Part Number: 2906096800
Alternative Number: 2906-0968-00 / 2906 0968 00
Related Part Reference: 2901500500 / 2901-5005-00 is also associated with shaft-seal/shaft-sleeve applications in aftermarket references.
Brand: Atlas Copco
Description: Shaft Seal Kit
Component Type: Shaft sealing/service kit
Application: Atlas Copco rotary screw compressors
Referenced Applications: GA90, GA110 and GA160 configurations
Primary Function: Seals the compressor shaft and prevents oil leakage
Secondary Function: Maintains oil containment around the rotating shaft
Operating Function: Provides a sealing barrier around the rotating compressor shaft
Main Benefits: Reduced oil leakage, restored sealing performance, improved oil containment and reliable compressor operation.

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.