Atlas Copco MD100–400 Gearbox Overhaul Kit Replacement – 2906073800

The Atlas Copco 2906073800 is a gearbox overhaul kit designed for servicing the gearbox of applicable MD100–400 oil-free compressor systems. The gearbox transfers rotational power and controls the required speed relationship between the drive and compressor components. During overhaul, the kit provides critical bearings, seals, O-rings, springs and retaining components required to restore gearbox performance and sealing.

Working Process

1. Power Input – The drive motor supplies rotational power to the gearbox.
2. Gear Transmission – The gearbox transfers torque through its gears to the compressor assembly.
3. Speed Control – Gear ratios provide the required rotational speed for the compressor.
4. Bearing Support – Bearings support rotating gearbox shafts and maintain correct alignment.
5. Sealing – Seal rings and O-rings prevent lubricant leakage and contamination.
6. Continuous Operation – Gears and bearings operate under continuous mechanical load.
7. Wear Development – Bearings, seals and other components gradually wear during service.
8. Overhaul – During scheduled maintenance, worn components are removed and inspected.
9. Component Replacement – The applicable components from 2906073800 are installed.
10. Testing – The gearbox is reassembled and checked for smooth rotation, leakage, noise and vibration.

Kit Components

Atlas Copco’s official product listing includes:

Kit weight: approximately 243 g according to Atlas Copco’s official listing.

Main Functions

• Supports MD100–400 gearbox overhaul.
• Replaces worn gearbox bearings.
• Replaces sealing and O-ring components.
• Helps prevent lubricant leakage.
• Maintains correct shaft support and alignment.
• Helps restore smooth gear transmission.
• Reduces the risk of secondary gearbox damage.
• Extends gearbox service life.

Typical Failure Symptoms

A gearbox requiring overhaul may show:

• Abnormal gearbox noise.
• Increased vibration.
• Lubricant leakage.
• Bearing overheating.
• Gear-meshing noise.
• Increased mechanical resistance.
• Deterioration of compressor performance.

Maintenance / Overhaul Procedure

1. Shut down the compressor following the applicable Atlas Copco service procedure.
2. Isolate and lock out the electrical supply.
3. Fully depressurize the compressor.
4. Allow the equipment to cool.
5. Drain/isolate the applicable gearbox lubricant.
6. Access and dismantle the gearbox.
7. Inspect gears, shafts, bearings and sealing surfaces.
8. Remove worn bearings, seals, O-rings and retaining components.
9. Thoroughly clean the gearbox components and mating surfaces.
10. Install the replacement components supplied with 2906073800.
11. Verify correct bearing seating and shaft alignment.
12. Check gear engagement and free rotation.
13. Reassemble the gearbox.
14. Restore the lubricant to the specified level.
15. Restart the compressor.
16. Monitor gearbox temperature, vibration and noise.
17. Check carefully for lubricant leakage.
18. Confirm normal compressor operation.

Technical Summary

Recommended catalog title:
Atlas Copco 2906073800 – MD100–400 Gearbox Overhaul Kit for Oil-Free Compressors, 2906-0738-00.

Atlas Copco’s official parts page confirms the MD100–400 Gearbox Overhaul Kit, and its component list provides the individual seals, bearing, spring, rings and washers included in the kit.

Compatibility note: Confirm the exact compressor model and serial number before ordering, as gearbox kits are configuration-specific.