Hydraulic bending machine maintenance method：
1. The slider cannot be turned down and the electromagnetic reversing valve cannot be reversed. Repair or replace the housing fixing screw loose. Check the circuit check and tighten; the valve of the reversing valve is stuck. Clean, grind or replace the slide valve.
2. The one-way throttle valve is stuck or shut down for inspection and cleaning.
3. The slider can only be repaired or replaced. The electromagnetic reversing valve cannot be reversed. The valve heart is stuck. Clean or replace the slide valve; do not operate or the housing fixing screws are loose. Check the circuit.
4. The hydraulic control check valve is stuck. Overhaul, the pilot operated check valve cannot be opened. Clean or replace.
5, it may be that the spring is loose. Tighten the pressure relay handwheel clockwise and the pressure relay is faulty. Press the spring.
6. Piston cylinder piston seals are seriously worn. Replace the seal.