The boom of a crane is prone to malfunction, so what are the possible faults?

If the third and fourth sections of the crane cannot extend after the second section of the boom is extended in a heavy construction site, it is mostly caused by a malfunction of the electro-hydraulic directional valve. If the fourth section of the crane arm cannot retract after the second and third sections are retracted, it is mostly caused by a malfunction of the electro-hydraulic reversing valve. If the third and fourth sections of the crane arm cannot retract after the second section of the crane arm is retracted, it is mostly caused by a malfunction of the electro-hydraulic reversing valve. If the fourth section of the boom cannot retract after the second and third sections of the boom have retracted. Cranes are often caused by faults in electro-hydraulic directional valves. During inspection, only the pilot valve was energized, and the fourth section of the crane arm still could not retract. The reason for the Kaifeng crane is that two hydraulic cylinders have retracted, and the rod length detector on the lifting arm has sent an electrical signal, causing the pilot electromagnetic reversing valve to be de energized. The hydraulic directional valve returns to its original position under the action of the reset spring, blocking the return oil circuit of the third hydraulic cylinder. So in order to retract the fourth section of the crane arm, the pilot electromagnetic reversing valve must be energized simultaneously.

The above is the updated content about the boom failure of the crane. Shandong Qilide Heavy Industry Machinery Co., Ltd. is dedicated to serving you.