How to install rubber seals correctly?

The function of the rubber seal is to close the gap between the oil spill of the tank and prevent dust, sand and other dirt from intruding into the interior of the tank, but if installed or used improperly, it will easily cause oil leakage and affect the normal operation of the machine, 75- A causes burnout of bearings, damage to gears, twisting of transmission shafts or other serious failures.
1. Precautions for installation of skeleton self-tightening rubber oil seal
(1) Before installing the oil seal, check whether the surface of the journal is too rough and whether there are any scratches, especially if there are long scratches along the axial direction. If the surface of the journal is too rough, it is easy to damage the oil seal or accelerate the wear of the lip 1:3 and destroy its sealing performance. If the surface of the journal is severely blunt due to improper disassembly, it will make the lip of the oil seal and the surface of the journal not fit tightly, resulting in oil leakage. In the above two cases, the welded part can be re-welded to the lathe turning circle according to the specified journal size after welding, or a new shaft can be replaced. If the journal has only metal burrs or shaft burrs, etc., it can be smoothed with a file to prevent damage to the lips of the oil seal when installing the oil seal.
(2) Check the lip of the oil seal for breaks, cracks or oily corrosion. If there are any undesirable phenomena, a new oil seal should be replaced.

(3) When installing the skeleton oil seal, in order to prevent the oil seal lip 121 from being stretched or damaged by scratching, a special installation tool must be used. If you do not have this tool, you can use the following method to install: first roll a layer of transparent hard plastic film (commonly known as cellophane) on the journal and even the shaft head, smear a little engine oil on the surface, and wrap the oil seal into the wrapped plastic The shaft end of the membrane, evenly push the oil seal to the journal, and then pull out the plastic membrane. Note: The direction of the lips should not be installed in the wrong direction. They should face the inside of the stored oil, and the side with the trademark and specifications should face the outside. Because the lip 1:3 can only be sealed in one direction, if the oil seal is reversed, it will inevitably cause oil leakage, and the sealing effect will be weakened or invalid. To avoid the oil seal crooked or hammering on the surface of the oil seal with hammers or other tools, otherwise it is easy to cause damage to the oil seal.