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oil seal Common failure reasons and troubleshooting methods

The oil seal belongs to the moving sealing element, and the existence of "critical oil film" is the sufficient and necessary condition of oil seal.Because the existence of lubricating oil film is necessary to ensure the lubrication friction lock of oil seal, and the existence of lubricating oil film makes a certain amount of leakage inevitable.For rotary seals, it is permissible to allow minor leakage during use during the first 50 to 100 hours of operation.With longer running time, the leakage will gradually stop, often such oil seal life is longer.Minor leaks are permissible during the useful life, otherwise they must be treated in accordance with the following common causes and troubleshooting of oil seals.

1. Poor oil seal of the framework causes early leakage

Sequence number fault cause analysis and troubleshooting methods

1. Poor lip of framework oil seal, poor manufacturing quality, burr or defect on cutting edge of framework oil seal, remove burr or replace framework oil seal

2 frame oil seal spring poor quality or failure frame oil seal spring manufacturing poor quality replace frame oil seal spring

3. The radial pressure is too small, the spring is too loose, and the holding force is too small

2. Poor assembly of framework oil seals and leakage occurs

Sequence number fault cause analysis and troubleshooting methods

1. When there is obvious scar on the lip of the skeleton oil seal, the skeleton oil seal passes through the keyway or thread and scratches the lip to replace the skeleton oil seal;When reinstalling, use a sheath to protect the lip of the framework oil seal

2. The installation tool of skeleton oil seal was butterfly shaped. The installation tool of skeleton oil seal was improperly redesigned and manufactured

3. Flip the assembly direction of the lip mouth of the framework oil seal or spring loosens the chamfer of the shaft end improperly, with too high roughness, or use too much force for assembly, which causes the lip of the framework oil seal to flip or spring falls off, use fine sandpaper to polish the chamfer of the shaft end and apply grease, and carefully install the framework oil seal

4 skeleton oil seal lip and shaft surface coating grease too much assembly, skeleton oil seal lip and shaft surface coating grease too much after the shaft operation for a period of time, grease can be reduced and returned to normal


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