Atlas Copco Gearbox Kit C146 Replacement – 2906096900

Atlas Copco 2906096900 – Gearbox Kit C146

The Atlas Copco 2906096900 (2906-0969-00) Gearbox Kit is a service and overhaul kit designed for compatible GA90–GA160 stationary oil-injected rotary screw compressors. The kit is associated with the C146 gearbox and is used to restore the mechanical condition of the compressor gearbox during maintenance or overhaul.

Working Process:

The gearbox transfers and manages rotational power between the compressor drive system and the compressor air-end. During operation, the gearbox components rotate continuously and are subjected to high rotational loads, torque, vibration, temperature and lubrication conditions.

The gearbox maintains the required rotational relationship between the drive and compressor element so that the air-end can operate at its designed speed.

The 2906096900 Gearbox Kit provides replacement components for worn gearbox components, including bearings, shaft-sealing components, parallel keys, circlip, mounting screws and sealing washer. Atlas Copco’s official catalog lists the kit for GA90–160 stationary oil-injected compressors and gives a weight of 8.06 kg.

Atlas Copco’s official component list includes:

• Bearing – 1 pc
• Parallel Key – 1 pc
• Kit Shaft Seal – 1 pc
• Circlip D=80 – 1 pc
• Hexagon Screw – 8 pcs
• Parallel Key – 1 pc
• Ball Bearing – 1 pc
• Dowty Seal Washer 1/2+ – 1 pc

These components work together to restore bearing support, shaft positioning, sealing and mechanical retention inside the gearbox.

The bearings support the rotating gearbox shafts and reduce friction while maintaining the correct shaft position.

The ball bearing and other bearing components allow smooth rotation and help control radial and axial movement of the rotating assembly.

The parallel keys transmit torque between the shaft and the associated rotating components. They prevent unwanted relative rotation between the shaft and mounted components.

The shaft seal kit prevents gearbox lubricant from escaping along the rotating shaft and helps prevent contaminants from entering the gearbox.

The circlip provides mechanical retention and prevents the relevant component from moving axially from its designated position.

The hexagon screws secure the gearbox components during assembly, while the Dowty seal washer provides a reliable seal around the applicable connection.

During normal compressor operation, the gearbox is exposed to continuous rotation, torque, vibration, temperature changes and lubricant pressure. Over long operating periods, bearings and shaft seals can wear.

A worn bearing can create excessive shaft clearance, abnormal vibration, increased noise and higher operating temperature.

A damaged shaft seal can allow gearbox oil to leak. Loss of lubricant can reduce bearing and gear lubrication and may eventually result in serious mechanical damage.

Worn parallel keys or keyways can create backlash or improper torque transmission between the rotating components.

If gearbox components are allowed to operate beyond their service condition, the resulting vibration and mechanical wear can affect the compressor air-end and drive system.

Maintenance / Overhaul Procedure:

Before gearbox maintenance, the compressor must be stopped, electrically isolated and made safe according to the applicable Atlas Copco service procedure. The compressor must be completely depressurized and allowed to cool.

The gearbox should be inspected for oil leakage, abnormal noise, excessive vibration, bearing wear, shaft movement, damaged seals and worn torque-transmission components.

The gearbox should be dismantled according to the applicable service instructions.

The existing bearings, shaft seal, keys, circlip, sealing washer and applicable mounting components should be inspected.

Worn components should be replaced using the 2906096900 Gearbox Kit.

Bearings must be installed using the correct installation method and without applying force to the incorrect bearing race.

The shaft seal must be installed carefully to avoid damaging the sealing lip. The sealing surface should be clean and free from scratches or contamination.

The parallel keys must fit correctly in their respective keyways and must not have excessive clearance.

The circlip must be fully seated in its retaining groove.

The supplied screws and sealing washer should be installed correctly and tightened according to the applicable Atlas Copco torque specifications.

After assembly, the gearbox shaft should rotate smoothly without abnormal resistance, binding or excessive play.

The gearbox should be filled or restored to the specified lubricant level according to the compressor service procedure.

After installation on the compressor, the machine should be started and monitored for abnormal vibration, noise, oil leakage, temperature and operating behavior.

During operation, the gearbox should transfer the required rotational power smoothly to the compressor air-end.

Correct gearbox condition is essential for maintaining stable compressor operation and preventing premature wear of the drive and air-end components.

Using the Atlas Copco 2906096900 Gearbox Kit during the appropriate overhaul interval helps restore bearing support, shaft sealing, torque transmission, mechanical retention and overall gearbox reliability.

Part Number: 2906096900
Alternative Number: 2906-0969-00 / 2906 0969 00
Brand: Atlas Copco
Part Description: Gearbox Kit
Gearbox Designation: C146
Application: GA90–GA160 stationary oil-injected screw compressors
Product Family: Stationary Oil-Injected Compressor
Official Listed Weight: 8.06 kg
Component Type: Gearbox service/overhaul kit
Primary Function: Restores worn gearbox components and maintains reliable power transmission
Main Components: Bearings, ball bearing, shaft seal kit, parallel keys, circlip, screws and sealing washer
Operating Function: Supports rotating shafts, transmits torque, maintains shaft alignment and prevents lubricant leakage
Main Benefits: Reduced vibration, reliable shaft support, improved sealing, proper torque transmission, reduced mechanical wear and improved gearbox service life.

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