What should you pay attention to when extending the boom of a 32-meter pump truck?
In the hydraulic system of a concrete pump truck, the outrigger and arm system have certain particularities. For safety reasons, each vertical outrigger cylinder and each boom cylinder are equipped with a balance valve (commonly known as "hydraulic lock"). Only when the reversing valve is opened will the balance valve connect to the oil circuit. Otherwise, the balance valve remains closed, isolating the hydraulic oil inside and outside the cylinder.