Atlas Copco Gearbox Overhaul Kit 2906021800

The Atlas Copco 2906021800 Gearbox Overhaul Kit is used during major servicing of the compressor gearbox. The gearbox transfers rotational power from the drive system to the compressor element and maintains the required speed and torque relationship.

During an overhaul, worn sealing and mechanical components are replaced to restore proper gearbox operation, reduce oil leakage and maintain reliable power transmission.

Working Process

1. Power Input – The drive motor supplies rotational power to the gearbox.
2. Gear Rotation – The gearbox gears rotate and transmit the required torque.
3. Speed/Ratio Control – The gear arrangement provides the required rotational speed for the compressor element.
4. Power Transmission – Torque is transferred from the gearbox to the compressor element.
5. Lubrication – Gearbox oil lubricates the gears and bearings and removes operating heat.
6. Sealing – Seals prevent gearbox oil from escaping and contaminants from entering.
7. Continuous Operation – The gearbox continuously transfers power while the compressor is running.
8. Overhaul – During major service, worn gearbox components and seals are replaced using the appropriate overhaul kit.

Main Functions

• Supports complete gearbox overhaul.
• Restores gearbox mechanical condition.
• Helps maintain reliable power transmission.
• Supports proper gear and bearing operation.
• Reduces oil leakage.
• Helps maintain gearbox lubrication.
• Reduces vibration and abnormal noise caused by worn components.
• Extends gearbox service life.

Possible Failure Symptoms

A worn gearbox may cause:

• Abnormal gearbox noise.
• Excessive vibration.
• Oil leakage.
• Increased gearbox temperature.
• Gear wear or damage.
• Bearing wear.
• Reduced transmission efficiency.
• Unusual operating sounds.
• Compressor performance problems.

Overhaul 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 machine to cool.
5. Drain the gearbox oil according to the service procedure.
6. Remove the required gearbox components.
7. Inspect gears, shafts, bearings and housing.
8. Check for wear, scoring, pitting or abnormal damage.
9. Remove worn service components and seals.
10. Clean the gearbox housing and mating surfaces.
11. Install the applicable components supplied with 2906021800.
12. Replace seals and sealing components as required.
13. Reassemble the gearbox with the specified clearances and torque values.
14. Fill with the specified lubricant.
15. Rotate/check the assembly for free movement.
16. Restart the compressor.
17. Check gearbox temperature, vibration, noise and oil leakage.
18. Verify normal compressor operation.

Service Benefits

Using the 2906021800 Gearbox Overhaul Kit during the appropriate overhaul helps:

• Restore gearbox reliability.
• Reduce oil leakage.
• Improve power transmission.
• Reduce abnormal vibration and noise.
• Protect gears and bearings.
• Extend gearbox service life.
• Reduce the risk of unexpected compressor downtime.

Technical Summary

Recommended catalog title:
Atlas Copco 2906021800 – Gearbox Overhaul Kit for Compressor, 2906-0218-00.

Important: Some third-party catalogs differ in how they label this part, but the stronger cross-reference evidence identifies 2906021800 / 2906-0218-00 as a Gearbox Overhaul Kit. For exact compatibility, Atlas Copco recommends checking the machine serial number through its Spare Parts Book/Power Connect.