Atlas Copco LP Element Exchange Kit Replacement – 2901186600

Atlas Copco 2901186600 – LP Element Exchange Kit

The Atlas Copco 2901186600 (2901-1866-00) LP Element Exchange Kit is a service and replacement kit designed for compatible ZR/ZT oil-free screw compressors. It is used during maintenance or exchange of the low-pressure (LP) compressor element, providing the required sealing and fastening components to restore the assembly to proper operating condition.

Atlas Copco officially identifies this part as “LP EXCHANGE KIT FOR ZR ZT OIL FREE COMPRESSORS” and lists the kit weight as 291 g.

Working Process:

In a multi-stage oil-free screw compressor, the low-pressure (LP) element is the first compression stage. Atmospheric or inlet air enters the LP element, where the screw rotors compress the air to an intermediate pressure.

The partially compressed air then moves toward the high-pressure (HP) stage for further compression to the required final pressure.

Because the compressor operates without oil being injected into the compression chamber, maintaining accurate clearances and effective sealing around the LP element is particularly important for maintaining compression efficiency.

The 2901186600 LP Element Exchange Kit provides replacement sealing and associated service components used when servicing or exchanging the LP element.

Atlas Copco’s official component list includes:

• Seal – 2 pcs
• O-ring 10.11 × 2.4 – 1 pc
• O-ring 315 × 4 – 1 pc
• O-ring 69.5 × 3 – 1 pc
• Seal – 1 pc
• O-ring 64.5 × 3 – 1 pc
• Washer – 1 pc
• O-ring 84.1 × 3.56 – 1 pc
• Ring Spring – 2 pcs
• Screw – 1 pc
• Washer M16 – 1 pc
• Instructions – 2 pcs

These components are used to restore sealing, mechanical retention and correct assembly of the LP element.

The O-rings and seals prevent compressed air from escaping through the interfaces between the LP element and the compressor housing. Maintaining these seals is essential for preserving the intended pressure ratio and preventing external or internal leakage.

The spring rings, washers and screw provide mechanical retention and help maintain the correct position of the associated components.

During normal operation, the LP element and its sealing components are exposed to pressure fluctuations, temperature changes, vibration and continuous operating cycles.

Over time, sealing materials can lose elasticity, become hardened, flattened or damaged. If an O-ring or seal fails, compressed air can leak around the LP element.

Air leakage at the LP stage reduces compression efficiency and can increase the load required from the compressor. It may also cause abnormal pressure behavior between the LP and HP stages.

A damaged seal can additionally allow leakage between internal passages or to the external environment.

If the LP element itself is worn, the compressor may experience reduced capacity, increased power consumption, abnormal temperature, vibration or reduced overall efficiency. The exchange kit is therefore used alongside the applicable element replacement or overhaul procedure to restore the sealing condition.

Maintenance Procedure:

Before servicing the LP element, the compressor must be stopped, electrically isolated, completely depressurized and allowed to cool according to the applicable Atlas Copco safety procedure.

The LP element and surrounding housing should be inspected for leakage, contamination, wear, corrosion, damaged sealing surfaces and abnormal deposits.

The old O-rings, seals and associated service components should be removed carefully without scratching or damaging the mating surfaces.

The 2901186600 LP Element Exchange Kit should be used to replace the applicable sealing and retaining components.

All sealing surfaces must be thoroughly clean and free from dirt, old seal material and foreign particles.

Each O-ring must be installed in its specified groove and must not be twisted, cut, overstretched or pinched.

Seals must be installed in the correct orientation according to the applicable Atlas Copco service documentation.

The supplied washers, spring rings and screw must be fitted in their correct positions and orientations.

After assembly, the LP element should be checked for correct seating and alignment.

The compressor should then be reassembled and all connections checked for correct sealing.

After start-up, the compressor should be monitored during unloaded and loaded operation. Inter-stage pressure, temperature, vibration, leakage and overall operating behavior should be checked.

A correctly serviced LP element should provide efficient first-stage compression and maintain the intended pressure relationship with the HP stage.

Using the Atlas Copco 2901186600 LP Element Exchange Kit during the appropriate element exchange or overhaul operation helps restore sealing performance, reduce compressed-air leakage, maintain compression efficiency and support reliable operation of ZR/ZT oil-free compressors.

Part Number: 2901186600
Alternative Number: 2901-1866-00 / 2901 1866 00
Brand: Atlas Copco
Part Description: LP Element Exchange Kit
Official Description: LP Exchange Kit for ZR/ZT Oil-Free Compressors
Application: Atlas Copco ZR/ZT oil-free screw compressors
Component Type: LP compressor element service/exchange kit
Official Listed Weight: 291 g
Main Components: O-rings, seals, washers, spring rings, screw and instructions
Primary Function: Restores sealing and service components associated with the LP compressor element
Secondary Function: Prevents compressed-air leakage around the LP element
Operating Function: Maintains airtight sealing during first-stage compression
Main Benefits: Improved sealing, reduced air leakage, maintained compression efficiency, stable inter-stage pressure and improved compressor reliability.

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