2018-12-29
Buying an excavator will encounter various difficulties, such as how to judge the quality of the equipment and distinguish whether there are any performance hazards. Although a trace can be found through visual observation, it is also of little use to experts. For outsiders, it is basically useless. In terms of judging the quality of excavators. Not only for the power output of the entire engine, but also the normal use and coordination between the hydraulic system and the distribution valve are particularly important.
The quality of the engine is first identified by the naked eye to determine whether it has been disassembled and repaired. This can be done by checking whether the interface or plate nut has been disassembled, and whether the joints have been inspected. Even the most professional refurbishment cannot handle these details perfectly. It must be emphasized here that the disassembly of the top cover cannot be generalized, and major repairs can be understood by experts. The long-term operation of the engine, including the replacement of sealing rings due to joint wear, aging, and oil leakage, as well as the replacement of some supporting components, cannot determine the quality of the engine's working condition. Most people believe that it's definitely good to remain unchanged, but of course, devices from recent years will not have such problems. If encountered, there is no need to be afraid.
The second test mainly relies on listening. The best test results are achieved in winter due to weather conditions. As the temperature is low, the engine is in a state of combustion during the start-up phase, and the power is detected by both ears to see if there is any abnormal noise or short link compensation sound illusion during this phase.
Further differentiation requires hands-on experience, and during testing, it is important to be careful and preferably open the window. Especially during low throttle or combined action operations, if the engine speed drops, do not panic. Use the dashboard to call up the tachometer. If the drop does not exceed20%, of course, the drop in speed at the end of the month will prove the engine's excellent power. If conditions permit, wait for the temperature of the entire machine components to rise for a long time and repeat the load type combination operation of high and low throttle. If everything is normal, the power problem of the engine can be basically ruled out. The next issue will discuss the processing, inspection, and operation testing process of the hydraulic system.
Article from:www.shcteng.com Huacheng Second hand Excavator Network
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