Example 1: CB3463－1 SPC hexagonal turret semi-automatic lathe, during use, appears the turret head feed speed can't adjust the failure phenomenon. After turning off the machine, it still craw and can't normal use. Inspection and repairing: Check all hydraulic control components, especially the control elements are not found any problem.Replaced part of speed regulating valve, fault has not been eliminated. After the overhaul oil cylinder, find that "O" ring mechanical seals are serious wear and tear, which makes two cavity of the hydraulic oil cylinder and channeling. Finally, replace "O" ring mechanical seals, machine tool fault elimination and running back to normal.
Example 2: CE7120 Hydraulic copying lathe, in working process, appears profiling tool slide is lead knife downward turn to longitudinal feed cutting knife,metallic sound, machine can't work normally.
Inspection and repairing:Check the hydraulic control elements are trouble-free, repair work get into the blind area at one time. Overhauling longitudinal oil cylinder head, found that the piston seal "O" ring mechanical seals have been wear out extremely. At the same time, the size of the mechanical seals is not suitable with the machine, and there is a big gap between the mechanical seals and oil cylinder, which lead to oil fluxion in two oil cylinder.