Concrete pump truck malfunction:
When the 混凝土泵车 is working, the first boom automatically falls down.
现象及原因：
During normal operation of the 混凝土泵车, if the boom cannot be supported, the first boom oil cylinder may automatically fall, which affects construction safety.
Emergency elimination methods:
Retract all the booms and place them on the main support of the 混凝土泵车. For the concrete pump truck equipped with a Wiggers balance valve, simply swap the rod chamber and rodless chamber of the oil cylinder balance valve core up and down; The balance valve produced in Italy requires the overall replacement of the balance valve block between the rod chamber and the rodless chamber of the oil cylinder.
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