When a dump truck (tilting mechanism, hydraulic system) is lifted in the trunk, the carriage rises unevenly (crawling), the lifting capacity is weak and the lift is not high enough. It is caused by a large amount of air in the hydraulic system. As long as you can exhaust all the air in the system, the trouble can be eliminated.
In the case of the hydraulic lifting system, check the hydraulic system and find no signs of leakage of hydraulic fluid. This shows that most of the air in the system is mixed with hydraulic oil; a small amount is in the late work, along the hydraulic system is not sealed (such as cylinder seals, Baotou North Benz fittings, pipe joints, etc.) infiltration.
The method is: the exclusion of air lifting carriage, and make it stay in the piston nears TDC position (approximately with TDC distance of total travel 8%), Baotou North Benz accessories PTO hang into the low, let Baotou Benz accessories idling the engine running, the pump rotates slowly (note pump speed can not be too high, otherwise it will return the air pump, the hydraulic oil emulsion into the foam, the air is more difficult to discharge). Slightly loosen the oil pump with the gas plug, let air foam hydraulic oil discharged from the gas plug at. To be discharged from the pure hydraulic oil, the oil drain plug screw, the end of the exhaust process. After such treatment, the fault is eliminated.