Concrete pump truck malfunction:
The variable displacement oil pump of Rexroth is damaged, causing the boom to be unable to move.
Phenomenon and reasons:
When operating the boom, only rotation can work, and other booms cannot move. The pressure of the boom system is only about 6Mpa.
The constant power valve of the Rexroth oil pump malfunctioned, causing the oil pump to operate at its lowest displacement, resulting in the aforementioned malfunction.
Emergency elimination methods:
Turn off the engine, manually push the inclined plate of the oil pump to its maximum position under the chassis, and then operate the boom.
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