When the hydraulic system fails, we usually have two starting points when looking for:
(1) From the host fault. Failure of the hydraulic system causes failure of the host itself, ie the actuator cannot work properly;
(2) Start with a system failure. The failure of the hydraulic system does not affect the host in a short period of time, such as excessive leakage, temperature changes, etc.
Of course, these two types of faults sometimes occur at the same time. If the failure of the pump causes the host to fail, the host's actuator will not work properly and cause an increase in noise.
Practice has proved that: for a hydraulic system composed of a component to be inspected, a basic inspection is performed. Usually, when the component under fault is analyzed, heat, noise, leakage, etc. are used as a clue. This is extremely effective for the diagnosis of hydraulic systems. Therefore, faulty hydraulic components can be logically inferred, judged, and identified according to different failure phenomena of different hydraulic systems. General diagnostic host failures can follow the following sequence:
1. When the implementing agency starts, it clearly identifies the fault that has occurred. If the movement speed does not meet the requirements, the output force is inappropriate, there is no movement, the movement is unstable, the movement direction is wrong, the movement sequence is wrong, and the crawling is performed. Regardless of what kind of failure occurs, the basic direction of the failure can be pointed out. Such as flow, pressure, direction, bearing and so on.
2, check the hydraulic system diagram. From each component of the system, the role of each component in the system can be identified.
3. List the component catalogs that may affect the fault. If the speed of a cylinder is slow, it can be considered as a result of insufficient flow. Although such failure may be due to insufficient pressure, the basic fault should be flow, and a list of components that may affect the flow of the cylinder should be listed. Such as leakage of the cylinder itself, excessive leakage of pressure control valve, etc.
4. From the component catalog, list the inspection points and parts, conduct preliminary tests, and conduct analysis.
5. Based on the completion of preliminary tests, adjustments and corrections are made, and abnormal signals such as excessively high temperatures, excessive noise, and vibrations are judged.
6. Repair and replace according to the faulty components listed in the preliminary inspection. If the preliminary inspection fails to identify the faulty component, a more thorough inspection of each component should be performed using various additional instruments.
