Pump seal failure of the labyrinth seal and oil seal

In a properly designed, sophisticated processing, assembly intact, speed is high, with labyrinth seals with good results. However, in practical applications, the resulting leakage are many, of which the main reasons are:
1, sealing (such as shafts and bearing gland) with the gap is too large, and this gap is inversely proportional with the sealing effect. With the surface roughness,seal strap it is obvious marks spiral car in some cases also increased the leakage tendency.
2, the amount of grease into the bearing interior too, the overflow pressure exceeds seal resistance.
3, the oil window or the oil level gauge installation location is incorrect, misleading the people to the correct amount of lubricant oil chamber judgment.
4, the operation oil temperature reduces its viscosity, increasing the possibility of leakage.
5, the back tank or back to the hole size is too small, or by other obstacles, so that the liquid can not be blocked smooth return and cause leaks.

Oil seals
Self-tight seal is a lip seal, its simple structure, small size, low cost, easy maintenance, resistance torque is small, both to prevent media leaks, but also to prevent external intrusion of dust and other harmful substances, but also to wear have a certain ability to compensate, but the impatience high pressure, it is generally used in low pressure applications. Seal should be installed in the manufacturing precision of h8 ~ h9, the surface roughness of 1.6 ~ 0.8μm and after surface hardening treatment of the shaft. Sealing medium should not contain solid particles and impurities, which will cause rapid wear of the shaft seal and leaving the barrier seals failure.