After starting the hydraulic pump, adjust the system pressure to about 1.0 MPa, respectively control the reversal of each solenoid valve, so that the oil is circulated to each branch separately, and the exhaust valve provided on the pipeline is screwed to discharge the gas in the pipeline; When the oil overflows continuously, close the exhaust valve. When the hydraulic cylinder is exhausted, the exhaust valve of the hydraulic cylinder piston rod extension side can be opened, the electromagnetic valve acts, the piston rod moves, the air is squeezed out, and when it reaches the top dead center, the exhaust valve is closed. Open the other side of the exhaust valve, make the hydraulic cylinder down, discharge the air in the rodless chamber, and repeat the above exhaust method until the air in the hydraulic cylinder is drained.
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