When the main motor is started, the oil pressure can be established, but the intensifier does not change direction and there is no output of high-pressure water.

Electrohydraulic reversing valve failure---- When necessary, it should be disassembled and cleaned with diesel oil. In addition, the solenoid coil of the electrohydraulic reversing valve sometimes burns out and needs to be replaced immediately.

Reversing sensor fault---- Pull out the Hall switch and check whether it works with a magnet. If it is broken, it needs to be replaced immediately. At the same time, check whether the Hall switches on the left and right sides are connected reversely by mistake. If so, swap with each other.