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Analysis on the Causes of Oil Leakage in Oil Seals

2023-09-08

Oil seals are used to seal shaft parts and achieve liquid lubrication. They ensure that the liquid lubricating oil does not leak through the extremely narrow sealing contact surface of their lips and the rotating shaft at a certain pressure.
Oil seals, as mechanical components for sealing, are widely used in agricultural machinery. Agricultural machinery such as combine harvesters and tractors are equipped with various oil seals, which can effectively prevent the leakage of lubricating oil and hydraulic oil, and prevent dust and dirt from entering the interior of the machine.
The most common failure of oil seals is oil leakage, which leads to a decrease in the amount of lubricating oil and directly affects the reliability of various agricultural machinery and equipment.
Other causes of oil leakage:
(1) Improper installation of oil seals.
(2) The shaft itself has defects.
(3) At the contact between the surface of the journal and the oil seal blade, there are defects such as circular grooves, ripples, and oxide skin on the surface, which cause the two to fit and even create gaps.
(4) Improper installation of the oil deflector (taking the rear axle oil deflector as an example).
(5) Not following the tractor technical maintenance procedures.
(6) The gear oil is not clean.
(7) Poor oil seal quality.

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