Two kinds of hydraulic system fault frequent fill pressure shown by the analysis concluded that the cause of the first case mainly in the following aspects:
-The tubing of hydraulic system is afraid of breakage and oil leakage is serious
-The lock cylinder or cylinder release occurred leak.
-The hydraulic oil in the tank is missing
-The working time of hydraulic pump is too long, which leads to wear and increase of clearance
-Solenoid valve failure.
The main causes of the second cases are
-The tubing of the hydraulic system is broken, but not too serious
-The lock cylinder or release cylinder leaks locally
-The safety valve, manual valve, one-way valve fault on the hydraulic assembly
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