In the process of breaking a huge stone into a small stone, the first crusher is often referred to as the "master" crusher. The longest history and the most rugged crusher is the jaw crusher. For the jaw crusher feed, material is poured into the crushing chamber with jaw teeth from the top entrance containing. Jaw teeth force the material to chamber wall with great strength, crushing the materials to smaller stones. The movement of the jaw crusher is supported by an eccentric shaft which runs through the frame. Eccentric motion is usually generated by a flywheel fixed at both ends of the shaft. Flywheel and eccentric support bearings often use spherical roller bearings. The working environment of the bearings is very harsh. Bearing must be subjected to the huge impact load, abrasive sewage and high temperature. Even though the harsh working environment, the jaw crusher still needs to work very reliably because it’s the guarantee to ensure the production efficiency.