The Great Wall of the hydraulic oil (HM hydraulic oil)From rust and oxidation on the basis of the hydraulic oil, which it has a high alkaline zinc, low alkaline zinc, neutral type high zinc and ash free, etc. Series of products, they all press & #; C kinematic viscosity is divided into four grades,,,,. ()To keep the hydraulic system clean, cleared of sludge and scrap metal within the tank. ()According to the oil change reference index for an oil change, oil change when equipment parts shall be clean, in order to prevent impurities such as mixed with oil, affect the use effect. ()Storage and use, containers and refueling tools must be clean and prevent oil contamination. ()The oil is mainly used in steel -Steel friction pair of hydraulic oil pump. For other material friction pair of hydraulic oil pump, oil pump must have factory or load limit of the oil pump oil supply unit is recommended.