Excavator Accessories Cylinder Failure, Check These Places!

（1）Check Whether There is Air in the Cylinder

1. If air is mixed into the oil and air is sucked in from the hydraulic pump, the air intake fault of the hydraulic pump can be eliminated first.

2. For new hydraulic cylinders, repaired hydraulic cylinders, or hydraulic cylinders whose equipment has been shut down for too long, there will be air in the cylinders and pipes.

It can be exhausted through the air release plug of the hydraulic cylinder. For the hydraulic cylinder without a special exhaust device, the inlet and outlet pipe joints at both ends of the hydraulic cylinder can be slightly loosened, and the hydraulic cylinder can be exhausted by reciprocating operation several times.
If the oil leaking from the joint turns from cloudy to clear, it means that the air has been swept clean, and the pipe joint can be re-tightened at this time.
For hydraulic cylinders that are difficult to exhaust by this method, the air can be exhausted by loading exhaust and filling oil into the cylinder to exhaust.

3. For the situation where negative pressure will be formed in the cylinder and it is easy to inhale air from the piston rod, pay attention to the rationality of the sealing design of the piston rod.

4. After starting the machine, let the hydraulic cylinder run for 10 minutes at the maximum stroke and maximum speed to force the gas out.

（2）Check Whether the Hydraulic Cylinder is Due to Poor Installation Accuracy

1. The installation quality of the hydraulic cylinder should be improved.

2. If the piston rod and the piston are not concentric, check the coaxiality of the two;
when the piston rod is bent, straighten the piston rod. The cooperation between the piston rod and the guide sleeve should be the cooperation of H8/f8, which should be strictly in accordance with the standard and quality standards. The manufacturer's qualified sealing ring and V-shaped sealing ring should be used to adjust the sealing friction to a moderate level.

3. Check whether the hydraulic cylinder end cover seal is pressed too tightly or too loosely
Adjust the sealing ring of the excavator accessories so that it is not tight or loose, and the guide sleeve is concentric to ensure that the piston rod can move back and forth by hand (or just tap with a hammer), and a layer of oil film is slightly hung on the piston rod.

4. Check whether the installation accuracy of the hydraulic cylinder is poor
For example, the connection point between the load and the piston rod should be as close as possible to the sliding surface of the guide rail; the axis line of the piston rod and the center line of the load should be the same; the contact length with the guide rail should be as long as possible; The load should be skewed; the guidance is better, the machining accuracy and installation accuracy are better, and pay attention to smoothness.

5. Check whether the production and installation quality of the guide rail is poor, the smoothness is poor, etc.
Methods such as cleaning and dredging the guide rail lubricating device, readjusting the lubricating pressure and smooth flow rate, coating a layer of anti-climbing oil (such as molybdenum disulfide lubricating oil) between the relative moving surfaces of the guide rail, etc., and scraping the guide rail moving pair from the beginning if necessary.