When a hydraulic excavator is digging the trench, the digging bucket moves slowly until it cannot work normally. According to the analysis, it may be due to the failure of bucket digging cylinder. After troubleshooting, it was found that the bucket digging action was slow due to the damage of the bucket digging cylinder. It is believed that the steel ring on the piston of the bucket cylinder is broken due to metal fatigue and other factors. This causes the piston to contact the cylinder barrel directly. During the frequent expansion and contraction of the piston rod, the broken stubble of the steel ring continuously scrapes the inner wall of the bucket cylinder. Wear the cylinder wall and cause internal leakage. This will reduce the movement speed of the bucket cylinder. With the increase of working time, the damage of the seal ring and the strain of the cylinder wall continue to increase, resulting in more serious leakage in the bucket cylinder. So that the control valve cannot control the action of the bucket cylinder.
