Center joint seal kits are kits for sealing center joints in hydraulic systems. The seal consists of an O-ring and the like. It can effectively prevent the oil leakage of the center joint, Make sure it's up and running. This kit has the characteristics of wear resistance, corrosion resistance, high temperature resistance, etc., and can maintain a good seal in harsh working environments. The problem of driving direction deviation is that the sealing ring of the central rotary joint is broken. In view of the structural characteristics and working performance of the central rotary joint, the oil seal in the central rotary joint has been damaged all the time. When the hydraulic oil is dirty, the oil seal, the housing of the central rotary joint and the mandrel are damaged at the same time. When the machine equipment is running, the speed of the travel motors on both sides is different due to the pressure Oil spill on one side, The result shows that the machine equipment has deviated in the direction of travel.