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There is air in the standard hydraulic cylinder of Changzhou Xuanda hydraulic Electromechanical Equipment Co., Ltd., and the working medium forms elastomer. The solution is to fully discharge the gas in the cylinder, check whether the diameter of the oil suction pipe of the hydraulic pump is too small, and the joint of the oil suction pipe is well sealed to prevent the pump from sucking air; The mismatch between the piston rod and the guide sleeve leads to excessive friction. At this time, the width of the seal ring groove needs to be made strictly according to the dimensional tolerance; If V-shaped sealing ring is used, adjust the sealing friction to a moderate degree; This can also happen if the sliding part of the hydraulic cylinder is seriously worn.