Concrete pump truck malfunction:
The main overflow valve has malfunctioned, causing the main system to have no pressure and unable to pump.
Phenomenon and reasons:
The pressure of the main system is 0Mpa during pressure holding, which causes the main oil cylinder to not operate, making it impossible to pump concrete.
1. The damping hole of the main overflow valve pilot valve is blocked;
2. The main overflow valve core is stuck.
Emergency elimination methods:
Open the main overflow valve and check if the damping hole is blocked. If there is any foreign object blocking it, immediately clear it and reinstall it. If the overflow valve core is stuck, block it with seven one yuan coins and install the overflow valve plate with the spring.
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