After-sales maintenance personnel of hydraulic shears can use accumulated experience and solid theoretical knowledge, combined with the actual situation of hydraulic shears, and use the means of "asking, watching, listening, touching, and testing" to quickly diagnose the location of the fault and one of the reasons. Methods, namely:
1. "Ask": By asking the operator of the hydraulic shearing machine, what faults have occurred in the hydraulic machine, it is helpful for the repairer to diagnose the fault;
2. "Look": By observing the working conditions of the hydraulic shearing machine, such as pressure gauges, pressure relays, position sensors, etc., it can be diagnosed whether a certain hydraulic component is feasible;
3. "Listen": By listening to the sound of the hydraulic system and components when the hydraulic shearing machine is working, it helps to diagnose whether the components are working properly;
4. "Touch": It is to use sensitive finger touch to check whether the pipelines or components of the hydraulic system have vibrations, shocks, and abnormal oil temperature rise;

5. "Test": It means to operate the actuator of the machine's hydraulic system and determine the location and cause of the failure from its working conditions.

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