Instructions for use: Push the installed barrel onto the lower side of the oil pressure pan, open the manual button, pull the upper hand reversing valve stem outward, and the oil pressure pan runs downward. Press the barrel mouth slowly. When pressing down, switch the button to automatic, and pressurize automatically every 10-15 seconds. When pressing to the upper electric contact pressure gauge needle, stop automatically. Automatically pressurize to 2-3 times. When the oil has been completely pressed, the button will be switched to stop. The upper reversing valve stem will slowly push inward to relieve the pressure. After the pressure is relieved, the connecting vertical rods on both sides of the lifting barrel will be matched with the connecting port on the barrel, and the manual mode will be switched