Atlas Copco ZR/ZT 110–145 8000H Maintenance Kit Replacement – 2906074100

Atlas Copco 2906074100 – ZR/ZT 110–145 8000H Maintenance Kit

The Atlas Copco 2906074100 (2906-0741-00) is an 8000-hour maintenance kit designed for compatible ZR/ZT 110–145 oil-free compressors. It is used during major scheduled preventive maintenance to replace critical wear, sealing, filtration and valve-related components.

The kit helps restore the compressor’s operating reliability after extended service and reduces the risk of unexpected downtime.

Working Process:

During normal operation, the ZR/ZT oil-free compressor continuously produces compressed air without oil being injected into the compression chamber.

As operating hours accumulate, seals, O-rings, filters, valve components and other wear parts gradually experience normal deterioration caused by temperature, pressure fluctuations, mechanical movement and contamination.

At approximately the 8000-hour maintenance interval, the compressor is shut down, isolated and depressurized.

The technician inspects the compressor and replaces the applicable components supplied in the 2906074100 maintenance kit.

The replacement parts restore sealing, filtration and valve/control functions, helping the compressor return to reliable operating condition.

After reassembly, the compressor is restarted and checked for correct pressure, temperature, airflow, leakage and overall operating performance.

Application:

The kit is specified for ZR/ZT 110–145 compressor models. Atlas Copco’s official product page identifies the part specifically as “ZR/ZT 110-145 8000H MAINT KIT.”

A DEWA procurement specification also identifies 2906074100 as an 8000-hour maintenance kit for ZR145 and provides a detailed list of included components.

Main Functions:

• Supports the 8000-hour preventive maintenance service.
• Replaces worn sealing components.
• Replaces filtration components.
• Renews inlet-valve-related components.
• Replaces specified wear parts.
• Helps maintain proper airflow and compressor control.
• Helps reduce leakage.
• Supports reliable oil-free compressed-air production.
• Helps minimize unplanned downtime.

Documented Kit Components:

A DEWA specification for a ZR145 identifies the following items under the 2906074100 kit:

• O-ring – PN 663210715
• O-ring – PN 663210716
• O-ring – PN 663210792
• O-ring – PN 663210793
• O-ring – PN 663210794
• Spring – PN 1621301400
• Water Filter – PN 1623924900
• Set of Wearing Parts – PN 2901067300
• Inlet Valve Kit – PN 2906037500
• Inlet Valve Bearing Block – PN 2906049700
• Air/Oil Filter Kit – PN 2906073000
• Valve – PN 8204094034

These components are specified for an Atlas Copco ZR145 compressor in the referenced procurement document.

Component Functions:

The O-rings provide sealing between mating components and prevent leakage of air or other operating media.

The spring provides the required mechanical return or loading force in the applicable valve/control mechanism.

The water filter removes water or moisture contamination from the relevant service circuit.

The set of wearing parts replaces components subject to normal mechanical wear during extended operation.

The inlet valve kit restores the correct operation of the compressor’s inlet-air control mechanism.

The inlet valve bearing block provides mechanical support and alignment for the inlet-valve mechanism.

The air/oil filter kit provides filtration for the applicable compressor circuit and helps maintain cleanliness and reliable operation.

The valve performs its specified control function within the compressor system.

8000-Hour Maintenance Process:

1. Service Interval Check: Confirm the compressor has reached the applicable 8000-hour service interval.
2. Shutdown: Stop the compressor using the normal shutdown procedure.
3. Isolation: Isolate electrical and pneumatic energy sources.
4. Depressurization: Completely release stored pressure before opening the system.
5. Inspection: Inspect filters, valves, seals, inlet-valve components and wear parts.
6. Filter Replacement: Replace the applicable air/oil and water filtration components.
7. Seal Replacement: Replace the specified O-rings and sealing components.
8. Wear-Part Replacement: Install the new wearing parts.
9. Inlet-Valve Service: Replace the inlet-valve kit and associated bearing-block components where required.
10. Valve Service: Replace the specified valve component.
11. Cleaning: Clean relevant housings, mating surfaces and service areas.
12. Reassembly: Reassemble all serviced components according to the applicable Atlas Copco service instructions.
13. Inspection: Verify that all components are correctly positioned and secured.
14. Leak Check: Inspect the serviced areas for leakage.
15. Restart: Return the compressor to operation.
16. Performance Check: Verify pressure, temperature, airflow, valve operation and general compressor stability.

Importance of the 8000-Hour Service:

The 8000-hour service is important because several compressor components are exposed to long-term operating conditions.

Seals can harden or lose their original sealing properties.

Filters can become contaminated or restricted.

Valves can experience wear or contamination.

Inlet-valve components can develop mechanical clearance.

Wear components can gradually deteriorate.

Replacing these parts during scheduled maintenance helps restore the compressor to a reliable operating condition.

Possible Problems From Delayed Maintenance:

Failure to perform the scheduled maintenance may increase the likelihood of:

• Air leakage
• Reduced airflow
• Increased pressure drop
• Valve malfunction
• Inlet-valve sticking
• Excessive mechanical play
• Filter restriction
• Control instability
• Reduced compressor efficiency
• Increased operating temperature
• Unexpected compressor shutdown

These symptoms should be investigated carefully because they can also originate from components outside the maintenance kit.

Maintenance Procedure:

Before maintenance, ensure the compressor is fully stopped, electrically isolated and depressurized.

Open the applicable service areas and inspect the existing components.

Remove the used O-rings, filters, valve components and wear parts.

Clean the mating surfaces and remove contamination.

Install the replacement components supplied or specified under 2906074100.

During installation:

• Ensure O-rings are correctly seated.
• Do not twist or damage sealing rings.
• Install filters in the correct orientation.
• Check valve movement.
• Ensure the inlet valve is correctly aligned.
• Verify correct bearing-block positioning.
• Secure all fasteners correctly.
• Ensure no foreign material remains inside the serviced assembly.

After assembly, perform the applicable leak and functional checks.

Restart the compressor and allow it to reach normal operating conditions.

Monitor:

• Discharge pressure
• Discharge temperature
• Airflow
• Valve operation
• Leakage
• Vibration
• Abnormal noise
• Overall compressor stability

A correctly performed 8000-hour service helps maintain reliable oil-free compressed-air production and reduces the possibility of unexpected maintenance problems.

Service Benefits:

The Atlas Copco 2906074100 maintenance kit helps:

• Restore sealing performance.
• Maintain filtration efficiency.
• Renew inlet-valve components.
• Replace critical wear parts.
• Maintain reliable valve operation.
• Reduce leakage risk.
• Support stable compressor performance.
• Reduce unexpected downtime.
• Extend the useful service life of compressor components.

Part Number: 2906074100
Alternative Number: 2906-0741-00 / 2906 0741 00
Brand: Atlas Copco
Official Description: ZR/ZT 110–145 8000H Maintenance Kit
Application: Atlas Copco ZR/ZT 110–145 oil-free compressors
Service Interval: 8000 operating hours
Kit Type: Preventive maintenance / major service kit
Primary Function: Replacement of critical wear, sealing, filtration and valve components
Main Components: O-rings, spring, water filter, wearing parts, inlet valve kit, inlet valve bearing block, air/oil filter kit and valve
Main Benefits: Restored sealing and filtration performance, reliable inlet-valve operation, reduced leakage risk and improved compressor reliability.

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