(1) the filter of the engineering oil cylinder is blocked by dirt cannot be used for oil filtering: use clean cleaning oil to remove the dirt in the filter.
(2) the oil level is insufficient, the oil suction position is too high, the oil suction pipe oil level is exposed: the oil is added to the standard oil position, the oil suction position is low.
(3) there are no paper pads on both sides of the pump body pump cover; There is no vertical seal between pump body pump cover; Air inhalation during tampering; There is a paper pad between the pump body the pump cover; The pump body is ground on the plate with silicon carbide so that the veracity of the pump body the pump cover is more than 0.005. The combination of the pump body the pump cover can be tightened without leakage.
(4) deformation friction exist between the driving shaft of hydraulic cylinder the motor coupling. Adjust the integrity of the pump motor coupling so that its defects do exceed 0.2 mm.
(5) the meshing accuracy of the engineering cylindrical gear is enough: the reverse gear reaches the meshing accuracy of the gear.
(6) the oil seal frame of the engineering hydraulic cylinder shaft is scattered the pump body is sealed: the oil seal of the pump shaft is qualified for replacement.
