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1. Lack of oil: If the oil film in the compressor is thin or there is no oil film, the lubrication effect disappears, dry friction occurs between mechanical parts, and the wear is serious. The ground debris becomes abrasive sand, causing more serious wear. This vicious cycle leads to the final shaft holding. 2. The refrigeration system is dirty: The dirt itself causes wear between compressor components. One particle is equivalent to a sharp knife, which causes more and more particles to be scratched, causing shaft locking. 3. The oil filter is clogged: Causes oil return problems, resulting in poor lubrication, accelerated wear, resulting in shaft holding 4 and bearing wear: The wear of the bearing causes the support of the screw to deviate from the original center and the axis is deflected, making the gap between the screw and the bearing seat smaller on one side, destroying the lubrication effect of the oil film; in addition, the wear of the bearing makes the positioning effect of the screw in the axial and radial directions worse, and the screw moves, causing wear and tear on the compression chamber and high-pressure end face of the compressor, which can also lead to shaft holding or cleaning. 5. Oil aging: The oil cannot lubricate and take away heat, and temperature has a great influence on the performance of the oil, which degrades the performance of the oil, leads to increased friction, and ultimately leads to shaft holding. 6. System lack of fluorine: After the lack of fluorine, heat is accumulated in the compressor, and the temperature rises, which reduces the viscosity of the oil and does not provide good lubrication, leading to wear. 7. Condensation temperature is too high: Affects lubricating oil viscosity, causing wear. 8. The heat load is too large: Affects lubricating oil viscosity, causing wear. York compressor bearing replacement, shaft lock repair