The rotor speed is low or does not rotate at all
This fault is mostly caused by four situations:
1. The nozzle hole is blocked. Most of the blockages are debris such as cotton yarn threads, gum particles, or metal powders. Compressed air can be used to blow through the nozzle hole, or debris can be removed with a bamboo stick, and then the nozzle hole can be cleaned thoroughly
2. Excessive bearing resistance. The most common reason is that fibers or other foreign objects enter the bearing, causing the bearing surface to become stuck or pulling the bearing working surface, resulting in an increase in rotor rotation resistance. After cleaning the bearings, use fine sandpaper to smooth out the burrs on their surface, and the rotor can resume normal operation
3. The sealing performance of the inner chamber of the rotor deteriorates. If the rotor bearings are excessively worn, or the gasket between the rotor body and the cover is damaged, or the nozzle is loose, it will cause oil leakage and pressure relief in the inner chamber of the rotor, weaken the driving force of the rotor rotation, and cause the rotor speed to decrease or cannot rotate
4. The nozzle hole is deformed. After long-term use, the nozzle hole of the centrifugal oil filter will become coarse and irregular due to wear, causing a change in the direction of the sprayed oil column and reducing the rotor speed.
Therefore, when maintaining or repairing centrifugal oil filters, do not use sharp tools such as steel wires or cones to clear the nozzle holes, in order to prevent damage or deformation to the nozzle holes.

The rotor runs unevenly and is accompanied by vibration
1. The rotor cover is deformed. It is often caused by collision or excessive force during disassembly and assembly, and in severe deformation, it must be replaced together with the rotor body
2. The impurity and dirt layers that are separated and adhered to the inner wall of the rotor are uneven in thickness. Decomposable rotor, use bamboo to scrape off the adhesion on the inner wall of the rotor and clean it thoroughly to ensure balanced operation of the rotor
3. The bearing is worn and the fit clearance is too large. In general, when the clearance is greater than 0.15mm, it is necessary to replace the bearing with a new one
4. Installation misalignment. Some rotor bodies and rotor covers have markings, and the two markings must be aligned during assembly. Random installation can disrupt its balance and cause vibration when the rotor rotates

Low filter cleaning efficiency
The main reason is that the technical condition of the centrifugal oil filter has deteriorated due to the lack of timely maintenance and repair, resulting in excessive adhesion on the inner wall of the rotor, blockage of nozzle holes, filter screens, and oil inlet holes, which reduces the rotor speed and affects the filtration efficiency and effectiveness of the centrifugal oil filter. In addition, if the oil used in diesel engines is too dirty, even if the centrifugal oil filter works well, it will still slack off. In this regard, the oil should be replaced and the centrifugal oil filter should be maintained.