1, bending machine oil tank cleaning, cleaning the pump inlet filter.
　　2, after using the machine for 1 to 2 months, cleaning the tank and filter hydraulic tank.
　　3, if found the advance and retreat switch failure, first check whether the solenoid valve action such as the action of the electromagnetic valve, check order valve 6X3, flood valve YF-L20H4 or one-way unloading valve 4HD3 whether impurities blocking phenomenon. ( this phenomenon occur usually in the began using of the equipment ). If the blocking phenomenon occur, take apart then clean with gasoline or diesel oil, reinstall it.
　　4,oil hydraulic pump joint are equipped with oil resistant rubber seal ring, if seal damage or leakage, should be promptly replaced.
　　5, check all parts of the fastener, so that in a fastening state.