Insufficient pressure of automobile crane hydraulic system is mainly due to the overflow valve hydraulic pump,bearing manufacturer failure cause. Truck crane hydraulic system generally consists of two or three hydraulic pump to provide pressure oil system.
Fuel pump is two, small displacement pump as the outrigger retractable power supply circuit,mobile crane bearing the manual reversing valve outrigger retractable loop is in place, the pressure oil enters through the center of the revolving body connector on the train combined control valve.
Large displacement pump output pressure oil through the center of the revolving body connector also enters the pressure oil pump output bus combination valve and manipulation of small displacement confluence together for the slewing mechanism, lifting mechanism circuit loop, telescopic crane bearing boom luffing loop and loop injection.
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