Atlas Copco Seal Kit GX2–5C Replacement – 2901109700

The Atlas Copco 2901109700 Seal Kit is a replacement sealing kit used on the GX2–5C (2003) oil-injected screw compressor. It contains O-rings and sealing washers used to maintain leak-tight connections around the compressor’s instrument block and associated oil/air connections. Atlas Copco’s official listing identifies it as a Seal Kit GX2-5C (2003) and gives a weight of 54 g.

Working Process

1. Air Compression – The screw element compresses incoming air.
2. Oil Injection – Oil provides cooling, lubrication and sealing during compression.
3. Pressure/Instrument Connections – The instrument block and connected components monitor and control compressor conditions.
4. Sealing – O-rings and sealing washers create tight connections between components.
5. Leak Prevention – Proper seals prevent compressed air or oil from escaping.
6. Stable Operation – Maintaining correct sealing helps the compressor maintain its designed pressure and oil circuit.
7. Continuous Operation – The seals remain compressed at the connection points throughout compressor operation.

Kit Components

Atlas Copco lists the following components for 2901109700:

Main Functions

• Seals instrument-block connections.
• Prevents oil leakage.
• Prevents compressed-air leakage.
• Maintains pressure integrity.
• Helps protect internal components from contamination.
• Restores sealing performance during maintenance.
• Supports reliable compressor operation.

Possible Failure Symptoms

Worn or damaged seals may result in:

• Oil leakage.
• Compressed-air leakage.
• Pressure loss.
• Oil contamination around fittings.
• Reduced compressor efficiency.
• Unstable pressure readings.
• Increased maintenance requirements.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate the electrical supply.
3. Fully depressurize the compressor.
4. Allow the compressor to cool.
5. Identify the instrument-block connections requiring service.
6. Remove the old sealing washers and O-rings.
7. Clean the sealing surfaces.
8. Inspect fittings for damage or wear.
9. Install the replacement seals from 2901109700.
10. Ensure O-rings are correctly seated and not twisted.
11. Install the sealing washers in their correct positions.
12. Tighten connections according to the applicable Atlas Copco torque specifications.
13. Restore the air/oil system.
14. Restart the compressor.
15. Inspect all serviced connections for leakage.
16. Verify normal pressure and compressor operation.

Technical Summary

Recommended catalog title:
Atlas Copco 2901109700 – GX2–5C (2003) Seal Kit for Oil-Injected Screw Compressor, 2901-1097-00.

Atlas Copco’s official catalog confirms the part as “KIT SEAL GX2-5C (2003) FOR OIL INJECTED SCREW COMPRESSOR” and lists the individual sealing components.

Note: Some Atlas Copco parts references describe 2901109700 more specifically as a “Seal Kit – Instrument Block” for GX2–GX5.