The diagnosis of hydraulic oil deterioration of oil resistance is caused by mechanical failure       

In the construction site often exist such a situation: oil deterioration and not know, know but can not change, or think oil metamorphism has nothing to do with. That's not the case. For example, the jacking hydraulic system of a F0/23B tower crane moves very slowly in the jacking operation, so it has to be repaired by lowering two towers a day.

Began to think that the pump, valve and other problems, the pump, valve and other parts of the whole check once again, no problems found, so only changed the oil seal, and then installed again, the result is still the same slow action. Let the operator to check the reason to tower crane. To the scene, saw the machine was really slow (later learned, the operator had opened and the tank and parts are serviced), pressure, pressure can also increase, reduce the pressure limiting valve and the pressure setting has more than 6.5MPa; the throttle valve oil cylinder above debugging when did not find what reaction. The author doubts that the cylinder is damaged and produces a serious internal discharge, but this is inconsistent with the next experiment (lifting the cylinder in a certain position, the result is no sinking phenomenon). Although the operator insisted (tank jacking system of pump and valve are all arranged on the inside of the tank) there is no problem (because they just overhauled, I decided to check the fuel tank); check result, oil tank full color, indicating a serious deterioration of the oil. Finally, all the oil is released, injected new oil and replaced with a new filter, installed after the test machine, the operation speed up. This is a typical case that the oil filter is stuck to the filter core and the oil flow rate is not up to the working requirement.