Atlas Copco AFTC Kit stationary oil-injected screw compressors Replacement – 2901009800

Atlas Copco 2901009800 – AFTC Kit GA45–75

The Atlas Copco 2901009800 (2901-0098-00) is an AFTC Kit designed for compatible GA45–75 stationary oil-injected screw compressors.

The kit is intended for scheduled compressor servicing and contains replacement sealing and assembly components required to maintain the integrity of the applicable compressor air-flow and control assembly.

Atlas Copco specifies an 8,000-hour service interval for this kit. The official catalog lists the kit weight as approximately 190.055 g.

Working Process:

During normal operation, the GA45–75 oil-injected screw compressor draws atmospheric air through its inlet system.

The air enters the compressor element where the screw rotors compress it. Compressor oil is injected during compression to provide lubrication, cooling and sealing between the rotating screw elements.

The compressed air/oil mixture then enters the separation system. Oil is separated from the compressed air and returned to the compressor oil circuit, while the compressed air continues toward the outlet system.

The compressor’s valves, seals and internal air-path components must remain correctly sealed for the system to operate efficiently.

During prolonged operation, O-rings, joints and other sealing components can deteriorate because of temperature cycling, pressure fluctuations, ageing and normal mechanical service.

The 2901009800 AFTC Kit provides replacement components used during scheduled maintenance to restore the required sealing and mechanical condition.

Once the worn components are removed and the replacement components are installed, the serviced assembly can maintain proper sealing and airflow.

This helps reduce leakage, maintain compressor efficiency and support reliable operation.

Main Functions:

• Supports scheduled 8,000-hour compressor maintenance.
• Replaces deteriorated O-rings and sealing components.
• Restores sealing at applicable compressor connections.
• Supports correct assembly of the serviced components.
• Helps prevent air leakage.
• Helps maintain correct compressor airflow.
• Supports reliable compressor operation.
• Helps reduce the risk of premature component deterioration.

Official Kit Components:

Atlas Copco’s official catalog lists the following components in the 2901009800 AFTC Kit:

• O-ring 74.5 × 3 – 2 pcs
• O-ring – 4 pcs
• O-ring 57.2 × 3 – 2 pcs
• O-ring 69.5 × 3 – 3 pcs
• O-ring 79.2 × 5.7 – 1 pc
• Division Rib – 1 pc
• Lock Washer – 8 pcs
• Ring – 1 pc
• Rib Joint – 1 pc
• O-ring 54.5 × 3 – 4 pcs

The official catalog lists the kit weight as approximately 190.055 g.

Compressor Operating Cycle:

1. Air Intake: Atmospheric air enters through the compressor inlet.
2. Inlet Regulation: The compressor controls the quantity of air entering the compression element.
3. Compression: Screw rotors compress the incoming air.
4. Oil Injection: Oil is introduced for lubrication, cooling and sealing.
5. Air/Oil Separation: The compressed air/oil mixture enters the separator system.
6. Oil Recovery: Separated oil is returned to the oil circuit.
7. Air Delivery: Compressed air moves toward the outlet system.
8. Continuous Operation: The compressor repeats the process according to air demand.

Role of the AFTC Kit:

The components supplied in the kit primarily support the sealing and mechanical integrity of the applicable compressor assembly.

The O-rings create seals between mating surfaces and prevent unwanted leakage.

The division rib and rib joint provide mechanical/interface support within the serviced assembly.

The ring maintains the specified position of the relevant component.

The lock washers help secure the applicable fasteners and prevent unwanted loosening during compressor operation.

Together, these components help maintain the correct mechanical and sealing condition of the serviced assembly.

Importance of O-Rings:

O-rings operate under pressure and temperature cycling.

Over time, they may experience:

• Hardening
• Compression set
• Loss of elasticity
• Cracking
• Surface damage
• Contamination
• Incorrect seating

A damaged O-ring can cause air or oil leakage.

Replacing the O-rings during scheduled maintenance helps restore the original sealing condition and reduces the possibility of leakage.

Possible Failure Conditions:

If sealing components become worn or damaged, possible conditions include:

• Air leakage
• Oil leakage
• Reduced compressor efficiency
• Pressure loss
• Unstable compressor operation
• Increased operating temperature
• Increased energy consumption
• Abnormal compressor performance

Possible visible symptoms may include oil residue around joints, leakage at sealing interfaces or abnormal pressure behavior.

However, similar symptoms can also be caused by other compressor components, so proper diagnosis is required.

8,000-Hour Maintenance Process:

1. Confirm the compressor has reached the applicable 8,000-hour service interval.
2. Stop the compressor using the normal shutdown procedure.
3. Isolate the electrical power supply.
4. Completely depressurize the compressor.
5. Allow hot components to cool before maintenance.
6. Open the applicable service area.
7. Inspect O-rings, joints, rings and fastening components.
8. Remove the old sealing components carefully.
9. Clean the mating and sealing surfaces.
10. Install the replacement O-rings from the 2901009800 kit.
11. Install the division rib, rib joint and ring where applicable.
12. Install the lock washers correctly.
13. Verify that all components are correctly positioned.
14. Ensure O-rings are not twisted, cut or damaged.
15. Secure all applicable fasteners according to the manufacturer’s service procedure.
16. Reassemble the serviced assembly.
17. Perform the applicable leak and functional checks.
18. Restart the compressor.
19. Monitor pressure, temperature, airflow and leakage.

Maintenance Inspection:

During service, inspect:

• O-ring condition
• Sealing surfaces
• Fasteners
• Lock washers
• Rib joint
• Division rib
• Ring
• Signs of oil leakage
• Signs of air leakage
• Contamination
• Mechanical damage

Any damaged mating surface should be addressed according to the applicable Atlas Copco service instructions before installing new seals.

Service Benefits:

Using the genuine Atlas Copco 2901009800 AFTC Kit during scheduled maintenance helps:

• Restore sealing performance.
• Reduce air and oil leakage.
• Maintain proper compressor airflow.
• Support compressor efficiency.
• Reduce the possibility of premature component failure.
• Maintain reliable GA45–75 compressor operation.
• Reduce unplanned maintenance and downtime.

Part Number: 2901009800
Alternative Number: 2901-0098-00 / 2901 0098 00
Brand: Atlas Copco
Official Description: AFTC Kit GA45–75
Application: GA45–75 stationary oil-injected screw compressors
Service Interval: 8,000 operating hours
Official Listed Weight: Approximately 190.055 g
Kit Type: Preventive maintenance/service kit
Primary Function: Replacement of sealing and associated assembly components
Main Components: O-rings, division rib, rib joint, ring and lock washers
Main Benefits: Restored sealing, reduced leakage, reliable airflow and dependable compressor operation.

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