The boom is falling fast
Whether the excavator can work smoothly or not, the working device must be fast and accurate every time it rises and falls. For example, if the boom device is seriously falling, stuck, or cannot fall accurately during the work, it will not only delay the construction period, but also make the maintenance more troublesome.
The reason why the above situation is difficult to repair is because the fault phenomenon is quite close, but the cause of the fault is very different, so everyone delays the inspection for half a day, but finds that the fault phenomenon still exists.
Today, Xiaobian will give you a detailed introduction to the fault phenomenon and handling of the boom. I hope to help everyone.
Failure phenomenon and cause
▊First: Keeping the valve worn causes the cylinder to fall seriously. If the valve is worn or stuck in a certain position, it will cause the cylinder to fall. If the boom falls seriously, the boom will fall very fast whether it is in operation or in the stop. At this time, check the boom holding valve.
There is also a case where the boom cannot be dropped quickly, but the boom can be lifted, which is also a problem caused by keeping the valve stuck. (General excavators only have a retaining valve on the boom, some have a retaining valve on the arm, and the bucket is basically not. Keep valve)
▊Second: Oil port relief valve (overload valve) Severe wear can also cause the working device cylinder to fall. In this case, just look for the corresponding action relief valve, remove the cleaning check, in severe cases Direct replacement can be solved.
(The boom arm bucket cylinder has one relief valve for each action, and there are 6 action port relief valves on the general excavator distribution valve)
▊ Third: If the action valve stem wears, the corresponding action cylinder will appear to fall. In this case, the valve stem must be replaced to solve the problem. Remind everyone here that as long as the hydraulic oil filter is replaced frequently, it will be greatly avoided. This happens.
▊ Fourth: Cylinder piston oil seal wear, this is a common problem, usually caused by high temperature of hydraulic oil, hydraulic oil is not replaced in time, there are also some cases caused by excessive use of aging time.
At this time, as long as the cylinder cylinder is not worn, the oil seal can be directly replaced. If the cylinder is strained, the cylinder assembly must be replaced.
to sum up
Through the introduction of the above series, everyone has a basic concept in mind, which seems to be a simple failure of the big arm, but in fact there are subtle differences in the phenomenon of failure, then the cause of the failure is different.
Therefore, before we start to inspect, repair, and replace related parts, we must observe the fault phenomenon very carefully. As long as the fault phenomenon is judged accurately, the cause of the fault can be directly found, so that the speed of the fault is not fast. Can save money!
