Xugong crane hangs the power take-off at high idle speed.

Does the subject want to ask "the reason for the high idle speed of cranes"? Idle speed control valve is faulty. The normal idle speed of EFI engine is determined by idle speed control valve. According to the signals of engine speed, temperature, throttle switch and air conditioner switch, the electronic control unit opens the air intake bypass channel leading to the idle speed control valve or directly increases the throttle opening to increase the air intake and improve the engine idle speed.