1. Check the internal leakage of the boom cylinder. The easiest way to do this is to raise the boom and see if it has a noticeable free descent. If the drop is obvious, disassemble the cylinder for inspection, and replace the sealing ring if it is worn;
2. Check the control valve. First of all, clean the safety valve and check whether the valve core is worn, if it is worn, it should be replaced. If there is still no change after the safety valve is installed, check the wear of the valve core of the control valve, and the gap use limit is generally 0.06mm, and it should be replaced if the wear is serious;
3. Measure the pressure of the hydraulic pump. If the pressure is low, it will be adjusted, and the pressure will not be adjusted, which means that the hydraulic pump is seriously worn.
Generally speaking, the main reasons for the failure of the boom to lift the load of the hydraulic oil pump are:
a. The hydraulic pump is severely worn. Serious leakage in the pump when running at low speeds; When running at high speed, the pump pressure increases slightly, but due to the wear and internal leakage of the pump, the volumetric efficiency decreases significantly, and it is difficult to reach the rated pressure. The long-term work of the hydraulic pump aggravates the wear and tear, and the oil temperature rises, which causes the wear of the hydraulic components and the aging of the seals, damages the sealing ability, and the deterioration of the hydraulic oil, which leads to failures;
b. The selection of hydraulic components is unreasonable.
c. The design of the hydraulic oil pump system is unreasonable. Hydraulic pumps often work under full load or long-term overload (high pressure), and the system has hydraulic shock, long-term oil change, hydraulic oil pollution, aggravate the wear of the hydraulic pump, so that the hydraulic pump casing bursts (such failures have been found later).
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