Atlas Copco Oil Pump Kit Replacement – 2906066100

The 2906066100 Oil Pump Kit is a service kit used for maintaining the oil pump in applicable Atlas Copco ZR/ZT 55–90 oil-free compressors. The oil pump circulates lubricating/cooling oil through the compressor’s oil circuit to maintain proper lubrication and temperature control of the relevant mechanical components. Atlas Copco’s official listing identifies the part as an Oil Pump Kit and lists components including an oil-pump element, O-rings, ring, eccentric ring, key and pin.

Working Process

1. Oil Collection – Oil is available in the compressor’s lubrication circuit.
2. Pump Operation – The oil pump is mechanically driven and draws oil into the pump.
3. Oil Pressurization – The pump element generates the required oil flow and pressure.
4. Oil Circulation – Pressurized oil is circulated through the lubrication/cooling circuit.
5. Component Protection – The circulating oil supports lubrication and heat removal from applicable components.
6. Temperature Control – Oil carries heat away from components toward the cooling system.
7. Return Flow – After passing through the relevant circuit, oil returns for continued circulation.
8. Continuous Operation – The pump operates continuously as required while the compressor is running.

Main Functions

• Services the compressor oil pump.
• Restores oil-pump performance.
• Maintains required oil flow.
• Supports stable oil pressure.
• Helps maintain proper lubrication.
• Assists heat removal from lubricated components.
• Helps prevent oil leakage through replacement sealing components.
• Supports reliable compressor operation.

Kit Components

Atlas Copco’s official product listing identifies components including:

• O-ring — 1 pc
• O-ring — 1 pc
• Ring — 1 pc
• Pump Element — 1 pc
• Eccentric Ring — 1 pc
• Key — 1 pc
• Pin — 1 pc

The official listing gives the kit weight as approximately 1.03 kg.

Possible Failure Symptoms

A worn or damaged oil pump may cause:

• Low oil pressure.
• Insufficient oil flow.
• Abnormal oil-pump noise.
• Increased operating temperature.
• Poor lubrication.
• Oil leakage.
• Increased component wear.
• Compressor alarms or shutdown.

Maintenance Procedure

1. Shut down the compressor according to the applicable Atlas Copco service procedure.
2. Isolate the electrical supply.
3. Allow the compressor to cool.
4. Follow the machine procedure for isolating and draining the oil circuit.
5. Remove the oil-pump assembly.
6. Inspect the pump housing and drive mechanism.
7. Remove worn pump components.
8. Clean the mating and sealing surfaces.
9. Install the replacement components supplied with 2906066100.
10. Ensure the pump element, eccentric ring, key and pin are correctly positioned.
11. Replace the applicable O-rings.
12. Reassemble the oil pump according to the manufacturer’s procedure.
13. Restore the oil circuit.
14. Restart the compressor.
15. Check oil pressure and oil circulation.
16. Inspect carefully for oil leakage.
17. Monitor compressor temperature and operating performance.

Service Benefits

Using the 2906066100 Oil Pump Kit helps:

• Restore oil-pump flow and pressure.
• Maintain proper lubrication.
• Support compressor temperature control.
• Reduce the risk of oil starvation.
• Reduce oil leakage.
• Improve compressor reliability.
• Extend service life of associated components.
• Reduce unexpected downtime.

Technical Summary

Recommended catalog title: Atlas Copco 2906066100 – ZR/ZT 55–90 Oil Pump Kit, 2906-0661-00.

Compatibility note: Verify the compressor model and serial number before ordering. The strongest Atlas Copco reference identifies this kit for the ZR/ZT oil-free compressor range, while parts catalogs specifically associate it with ZR/T 55–90.