2018-12-30
In the previous issue, Huacheng briefly introduced how to identify the basic problems of engines when purchasing second-hand excavators and what precautions should be taken when purchasing. This issue mainly focuses on the identification and recognition of hydraulic pump components. Hydraulic pumps are used in various brands with complex models, and it is basically impossible to identify them one by one. However, in hydraulic pumps, as long as we know a few knowledge points, we can grasp the quality of the hydraulic system and distinguish the actual machine condition and performance of the second-hand excavator. Among professionals, the adjustable flow rate of the hydraulic system can blind many customers. Merchants improve the speed and force control of the entire machine by increasing the hydraulic flow rate. In the test, it showed great power output performance, but the hidden dangers were very terrifying.
The hydraulic pump of a second-hand excavator should first compare the old and new to see if there is any renovation. The hydraulic pump has many polygons and the renovation is meticulous, which inevitably exposes the flaws, especially whether there is old paint or unevenness in the interface of the mechanical components. If there are major problems with the defective parts, it may be due to renovating the hydraulic pump or using a cheap auxiliary hydraulic system. At this time, it is necessary to give up decisively. The second aspect of checking the nut needs to be carefully examined. If there is twisting, do not panic. If there is twisting and disassembly of a single-layer nut, it is not a big problem. For some hydraulic systems that are vulnerable to maintenance and upkeep, the main inspection is to check whether there is any loading or unloading of the connecting part of the engine. If there is obvious twisting, then the hydraulic pump system may have had a major problem.
The hydraulic system technology in China is already very mature, and the prices of some manufacturers' standard hydraulic pumps are often very high. This mainly focuses on high-end brands and imported equipment that need to be taken seriously, especially in the Huacheng second-hand excavator market where detailed matching and comparison with similar models can be carried out through large-scale equipment screening and comparison. Secondly, in excavator testing, hydraulic flow can be queried under conditions to avoid increased flow, which can also be clearly seen in hydraulic pumps. It takes some time for experienced professionals to learn before making a purchase.
The Huacheng second-hand excavator market has professional three major data monitoring conditions, which can conduct comprehensive performance testing and evaluation according to customers' actual needs, and provide comprehensive technical services for existing mechanical equipment. The next issue will provide a detailed introduction to the testing and evaluation process of distribution valve components.
Article from:www.shcteng.com Huacheng Second hand Excavator Network
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