Fault phenomenon:
after a few hours PC300 digging arm could not lift, and hydraulic oil is dirty, as if being rusted
Komatsu PC300 excavator arm could not lift up reason analysis:
1, may be due to oil seal temperature rise and cause seal fail to work.
2, check the digging machine action? If the action is abnormal, it may be machine distribution valve is blocked.
3 leakage of oil seal or the plunger of the cylinder is broken, leading to the excavator arm could not lift up
4 hydraulic control valve wear, the hydraulic oil temperature can also be used when the hydraulic oil temperature, the density is reduced, so that valve block gap closure could not oil pressure relief caused Komatsu PC300 excavator stick lift up
