The following is a specific plan and strategy for the replacement of KYKY molecular pump bearings, compiled based on comprehensive technical specifications and maintenance requirements:

1、 Preparation before replacement

Fault diagnosis and shutdown

Determine replacement conditions: When there is abnormal vibration, increased noise, significantly prolonged start-up time (such as obvious resonance point noise), or lubricating oil turning black in the short term, bearing wear should be considered.

Safe shutdown: Immediately turn off the power supply of the molecular pump, stop the operation through the controller, and disconnect the front stage pump and cooling system after the rotor is completely stationary (speed displayed as 0).

Environment and tool preparation

The operation should be carried out in a clean and dust-free environment to avoid impurities entering the pump body.

Prepare specialized tools: motor extractor (for disassembling motor components), calibration ring (for adjusting clearances), anti-static gloves, neutral cleaning agent, and lubricating grease, etc.

2、 Core steps for bearing replacement (only for professional personnel from the manufacturer)

Dismantling process

Remove the screws from the external oil tank of the pump body, pour out the waste oil, and clean the oil tank.

Use tools to remove the fixing ring and sealing ring, and sequentially remove the motor fixing screws (note that the reverse threaded nut needs to be rotated in the opposite direction for disassembly)

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Separate the motor components using a motor extractor, remove the old bearings, shock-absorbing washers, and oil bags, and thoroughly clean the motor components with alcohol

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Installation and Calibration

When replacing a new bearing, it is necessary to replace the shock-absorbing washer, oil package and other supporting components synchronously to ensure that all parts have no residual pollution

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After installation, it is necessary to use calibration tools to adjust the bearing clearance to ensure the accuracy of rotor dynamic balance (KYKY molecular pump requires complete machine balance, and users cannot operate it by themselves)

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Re inject specialized low saturation vapor pressure lubricating oil within the oil mark range to avoid excessive oil infiltration into the pump chamber

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3、 Return to factory maintenance strategy

User operation restrictions

The replacement of KYKY molecular pump bearings needs to be returned to the original factory. As it involves magnetic levitation system calibration or oil lubricated whole machine balancing, users are strictly prohibited from disassembling the core components themselves

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Users can only complete preliminary fault records (such as abnormal phenomena, operating hours), seal the pump body (wrapped in clean plastic bags to prevent contamination), and contact technical support

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Precautions for returning to the factory

Provide complete fault description, controller parameters, and operation logs to assist manufacturers in quickly locating problems

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During transportation, it is necessary to fix the pump body and avoid inversion to prevent secondary damage caused by vibration and impact

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4、 Maintenance strategy for extending bearing life

Lubrication management

Oil lubricated pumps need to be changed strictly according to the cycle (first 1000 hours, then every 4000 hours or once a year), and the cycle should be shortened when removing corrosive gases.

Use the original factory specified lubricating oil, do not mix or replace it, and thoroughly dry the oil tank after cleaning.

Environmental control

Avoid strong magnetic fields (<30 Gauss) and radiation interference to prevent magnetic levitation bearings from losing control or abnormal oil lubrication systems.

Cooling water flow rate ≥ 1 liter/minute, water temperature controlled at 20-25 ℃ to prevent overheating and accelerated bearing wear.

5、 Special scenario handling

Corrosive gas working condition: After replacing the bearing, it is necessary to continuously introduce inert protective gas (such as nitrogen) and regularly check the integrity of the sealing ring.

High dust environment: Install a pre filter to reduce bearing scratches caused by particulate matter entering the pump chamber.

For specific operation manuals or customized maintenance plans, it is recommended to directly contact KYKY official technical support for professional guidance.