Xia Sheng Gongchu flat wrecker winch air hole leakage is how.
Lead seal is missing a lot of plasticizer, softening agent, the hard problem of corrosion, first oil leakage, slowly dripping phenomenon, a long time sealing ring fracture
More than 90% of the oil spill problems are because of the rubber ring inside the gearbox for a long time by the temperature changes alternately
