Single hydraulic props are transported over long distances, loading and unloading, which easily leads to damage to the sealing eye, the piston is bent, the cylinder is sunken, and the spring is detached.
The test principle is that no pressure drop is allowed within 2 minutes, no leakage is allowed in the cylinder within 4 hours, the lifting column is not allowed to be jammed, and the limiting device must be frim and reliable. A working surface with a single hydraulic prop must have a certain number of spare support materials.
