The hydraulic cylinder can not drive the load when working, mainly manifested as the piston rod stop is not allowed, insufficient thrust, speed decline, unstable work, etc., the reasons are:

Engineering hydraulic cylinder traditional repair method is to disassemble the damaged parts after outsourcing repair, or brush plating or the surface of the overall scraping and research, the repair cycle of the hydraulic cylinder block scratched repair long, high cost.

After checking, if you find that the hydraulic cylinder parts are normal and there is no oil leakage problem, then you need to empty the air in the cylinder.