How to troubleshoot the truck crane

There may be parts of the truck crane owner who is using the truck crane to operate. He will encounter a situation in which the winch motor will not turn suddenly and it cannot lift or fall. However, other hydraulic mechanisms can work normally. When the mechanism handle is raised, the pressure gauge shows zero. At this time, the driver does not know how it happened. Where did the problem occur? The first thing to be sure is that the vehicle is hanging out of trouble, but where does the fault occur? The following Xiaobian teaches us how to carry out troubleshooting when the fault occurs.

Because other institutions can work normally, the failure of the hydraulic pump can be ruled out first. If there is a problem with the hydraulic pump, when operating to the position where the two pumps merge, the hoist should work slowly rather than stop working. And because the pressure gauge shows zero when the operation is hoisted, then basically it can be judged that the problem must be on the overflow valve of the winch circuit.

At this point, we remove the main relief valve. If there is no abnormality after the inspection, if the fault persists after the cleaning and installation, then the main overflow of the vehicle should be noted as the remote pilot control, that is to say when the volume is over When the solenoid valve is powered on, it can also cause the valve to open, causing unloading. So, unplug the plug, the fault still exists. When a constant current is drawn from the power supply, the solenoid valve is directly pushed. At this time, when the indicator on the electromagnetic valve is light but the sound of the solenoid valve is not heard, the entire solenoid valve is disassembled and disassembled. It was found that the return spring of the solenoid valve was broken, and the iron core under the action of gravity pushed the reversing valve stem to reverse it and eventually resulted in no pressure in the winch circuit. After the replacement of the spring, the on-board crane malfunction was eliminated.

When the hoisting motor of the truck crane malfunctions, it can be checked one by one through the above methods, as long as the root cause of the fault is found, the cause of the fault occurs, and the analysis is always kept calm. The last fault can be solved easily.

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