Oil pump leakage main reasons: injection pump gasket manufacturers for you to introduce it: 1, hydraulic pump spindle oil seal damage or shaft defects, scratches; 2. Excessive internal leakage will increase the pressure at the oil seal and damage or flush out the oil seal; 3. The drain pipe is too thin and too long, causing oil leakage at the seal; 4. The external oil pipe of the hydraulic pump is loose, the pipe joint is damaged, and the sealing pad is aging or cracked; 5. The bolt of variable adjustment mechanism is loose and the seal is damaged; 6, cast iron hydraulic pump shell has sand holes or poor welding.