Hydraulic Pump seal kits

How to prevent oil leakage in sealing elements of a breaking hammer and the solution to it. Situation No. 2: there is something wrong with the sealing elements: 1. Surface of piston seals and rod seals hardens, surface of motion fractures Reason: abnormally too high speed working pressure 2. Surface of piston seals and rod seals hardens and the whole sealing elements fracture Reason: hydraulic oil goes bad; ozone generated by oil of too high temperature damages seals, and