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There are two potential leak paths on an oil seal, i.e. between the outside diameter of the Oil Seal and the housing (static), and between the sealing lip and the shaft (dynamic)

In the table below the causes are listed, with a few recommendations to prevent these problems.
Oil Seal rotates with the shaftOutside diameter is smaller than the housing diameterReplace the Oil Seal, choose the right size
Oil Seal is moving in an axial direction on the shaftOutside diameter is smaller than the housing diameter
Replace the Oil Seal, choose the right size
Due to excess pressure the Oil Seal is moving axially
The mounted Oil Seal is deformedInside diameter of the Oil Seal is too smallControl the size of the shaft
The case of the Oil Seal is deformedWrong installation tools has been usedUse the right tools
Damaged surface of the Oil SealThe finishing has not been executed properlyControl the roughness of the housing and the presence of a chamfer
Clean all parts before assembly
Dirt at the in- our outside of the housing
Damaged sealing lipInsufficient lubrication
Construction limits the transport of the lubrication to the sealing lip
Lubricate sufficiently
Change the construction so that sufficient lubrication reaches the sealing lip
Oil Seal not  placed concentric with regards to the housingCentre the seal, use the right tools
Sealing lip has hardened, is worn out and is tornTo high temperature, shaft speed, pressure or insufficient lubricationChoose the right rubber compound and type of Oil Seal
Swollen sealing lipIncorrect  rubber compoundChoose the correct material
Scraped sealing lipRoughness of the shaft is incorrect

Control roughness
Incorrect tools used during assemblyChoose correct assembly tool
Collapsed sealing lipIncorrect assemblyLubricate before the assembly
Too high pressureChoose an Oil Seal for high pressures
The flexible part is tornToo high pressureChoose an Oil Seal for high pressures
Pressure directed at the flexible part
Garter spring out the grooveChamfer does not have the correct angle
Use a mounting sleeve, or make a chamfer on the shaft

Take care during the assembly
Incorrect assembly
Grooves not deep enough
Choose another design, or use a spring with a smaller diameter
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