What is the reason for the weak lifting and walking of the ShanGong 50F-2 boom?
3 Answers
The possible reasons include decreased volumetric efficiency of the tandem pump, blocked feedback oil pipe, or operating system failure. Decreased volumetric efficiency of the tandem pump: If there is a noticeable change in throttle size, it is generally due to decreased volumetric efficiency of the tandem pump, and the tandem pump needs to be replaced. Otherwise, check whether the priority valve spool is worn or stuck. If worn, it needs to be replaced; if stuck, it needs to be cleaned. If none of the above conditions are present, check whether the steering feedback oil pipe is blocked. If not blocked, turn the steering wheel after stopping. If it is difficult to turn, it indicates that the steering gear and steering cylinder are normal. Otherwise, the fault may lie in the steering gear or steering cylinder. Such faults must be analyzed and judged by professional maintenance personnel based on the on-site situation. Operating system failure: The ShanGong 50F first goes to the operating system, so first check whether the bucket operates normally. If everything is normal, it indicates that the pilot oil circuit is normal, and the working hydraulic system oil circuit is normal. Then, swap the pilot control oil pipes of the bucket and boom. If the boom returns to normal after swapping, it indicates that the working hydraulic system of the boom is normal, and the problem lies in the stuck or severely worn proportional distribution valve in the pilot valve. The pilot control valve needs to be replaced. Otherwise, the fault lies in the multi-way distribution valve and boom cylinder, and professional personnel are required to diagnose and repair on-site.
I often encounter similar issues, and it feels like this kind of equipment lacking power during movement is mostly caused by hydraulic system problems. If the hydraulic oil is too dirty or insufficient in quantity, poor flow can easily weaken the power; a clogged filter can lead to insufficient inlet pressure, directly affecting the boom's operation; if the hydraulic pump is worn or aged, the pressure output becomes weak, resulting in lack of power during movement; faults in the valve block or control valve, such as severe internal leakage or sticking, can also interrupt power transmission. Additionally, if the engine's power output is insufficient, it struggles more under heavy overall loads. I recommend checking the hydraulic oil condition and conducting a pump pressure test first, rather than waiting until the entire system has problems before taking action. Regular oil changes and filter cleaning are crucial to avoid the hassle and extra costs of major repairs.
I have also operated this type of machinery and found that lack of power often stems from poor oil flow or wear in transmission components. If hydraulic lines are aged and leaking, or if fittings are loose, internal pressure cannot build up; damage to bearings in the main reducer or drive shaft increases friction under load; improper safety valve settings, causing rapid pressure release, can also lead to power loss. I've encountered such situations before, and timely inspection and simple repairs can prevent further issues. Be alert if the equipment starts making more noise or overheating noticeably. It's best to have a professional technician use a multimeter to check the circuits or a hydraulic gauge to monitor pressure values, ensuring safe and stable operation to avoid accidents on the job site.
