For hydraulic cranes, why adjust the legs must be carried out without load
There is the system to provide pressure to the legs, the flow is relatively small
That is, reverse open, spool frequently open and close at this time to open the leg there is danger, Xuzhou Maske Machinery
This time will be on the hydraulic lock or balance valve spool force,
With the load will have the force in the leg on the cylinder, the pressure is relatively large, Xuzhou Maske machinery
