Seven Reasons for Boom Contraction Failure of Bridge Crane
1. The main boom is deformed;
2. Insufficient grease application;
3. The slider is improperly adjusted;
4. The piston rod of telescopic cylinder is bent or the piston is stuck in the cylinder;
5. The valve rod and piston of the balance valve are pinched with dust, and the oil impurities block the orifice;
6. The pressure of overflow valve is too low;
7. The elevation angle of the boom is not enough. If the main boom is found to be deformed, it shall be replaced or repaired in a timely manner. The sliding surface shall be fully smeared with grease, adjusted, repaired or replaced with oil cylinder, cleaned, overhauled, checked and adjusted, and the boom shall be erected.
