Coupler maintenance maintenance parts haoye hydraumatic machinery parts Filter cleaning and oil change for hydraulic coupler maintenance During the operation of the hydraulic coupling, the oil level of the oil tank should be checked regularly, and the suction oil filter of the oil pump should be cleaned regularly. When the new machine runs for 500 hours, the working machine stops for maintenance or the outlet oil pressure of the hydraulic coupling drops obviously, the filter screen should be removed, cleaned and the oil quality should be checked regularly, and the working oil should be replaced in time. The oil change standard is (any one of the following 5 items): (1) the acid value is higher than 1.2~1.5mgKOH? g-1 ② the water content is higher than 2‰ ③ kinematic viscosity (at 50℃) is 7×10-6m2 higher than that of new oil? s-1 (4) the content of insoluble impurities exceeds 2‰ ⑤ The foam resistance is greatly reduced, and the actual braking torque is reduced by 10% (mostly used for experimental analysis)