铲车维修（Forklift maintenance）.docVIP

铲车维修（Forklift maintenance） How to judge the leakage fault of loader hydraulic cylinder quickly Most of the construction machines, such as loaders, adopt symmetrical parallel hydraulic cylinders. It is important to judge the cylinder quickly and accurately. The method of quick judgement is: The loader arm up to the end, and then start the engine (the machine is in the neutral position), boom lever in the lowered position, the throttle to loosen the boom cylinder cavity at the interface of oil leakage can be judged the quality of seal cavity. If a large cavity interface leakage more, the cylinder oil seal oil seal is bad or damaged; if no leakage can loosen interface leakage rarely, the boom cylinder cavity seal sealing performance. The large cavity oil seal is damaged, it will cause the rising boom automatically fall, the judgment method and determination method of opposite seal cavity. This method can also be used to judge the sealing of a certain cylinder oil seal of a tipping bucket or steering cylinder of a loader, and a cavity of an unsymmetrical hydraulic cylinder (such as a bucket rod cylinder of a excavator or a bucket cylinder). 1. arm lifting weakness After the operation of a Liugong CLG888 loader for a period of time, the lifting of the boom was slow. The lifting of this machine adopts the technology of steering priority and double pump confluence, which is composed of pilot control oil circuit and main working oil circuit. The operation of the main working oil path is controlled by the pilot control circuit, so as to control small flow and low pressure to control large flow and high pressure. The high pressure oil produced by the work pump enters the bucket cylinder and the movable arm cylinder by the distributing valve, and the pilot operated valve is controlled by the pilot pressure in the middle to control the on-off of the high pressure oil. From simple to complex in order to check the oil, filter and other external factors, and then measuring the pil