What is the reason for the jitter of the crane boom

Answer:

Once the air into the hydraulic circuit, it will increase the oil elasticity, reduce the hydraulic drive stiffness, the telescopic cylinder impact and crawling phenomenon, causing the boom when the telescopic jitter.

There is an air hydraulic tank in the hydraulic cylinder where the liquid level is too low or the hydraulic circuit leaks, allowing the air to enter the hydraulic circuit.

Exclusion method: the balance valve disintegration cleaning, dredge damping holes.

Damping holes, damping holes once blocked, the balance valve will lose its role, causing the boom when the telescopic jitter.

Balance valve damping hole plug in order to make the arm telescopic smooth to prevent the occurrence of load impact, in the telescopic circuit set up a balance valve, the valve consists of a one-way valve and a relief valve, which is equipped with overflow valve