What is the cause of oil leakage in excavator cylinder? What should we pay attention to in daily operation?

What is the cause of oil leakage in excavator cylinder? What should we pay attention to in daily operation?

Oil cylinder is a very important object in hydraulic system. Once oil leakage occurs in hydraulic cylinder, it will lead to the phenomenon of slow lifting and weak excavation, which seriously affects the efficiency of work. What should we pay attention to when using excavator to avoid oil leakage in hydraulic cylinder?

First, external leakage

1. The seal damage of the piston rod extension end and the piston rod is mostly caused by the piston cylinder being brushed, and also by aging.

2. Seal damage of piston rod extension end and cylinder liner is mostly caused by aging of seal, but also by excessive extrusion of seal when upper cover is used, and also by unreasonable design of many domestic manufacturers of hydraulic cylinders. In most cases, manufacturers are caused by cost savings.

3. The cracking of the joint of the intake and outlet tubing of the cylinder will also lead to the leakage of the hydraulic cylinder.

4. Oil leakage caused by defects on cylinder block or cylinder end cap.

5. Piston rod is pulled and grooved, pitted, etc.

6. Lubricant deterioration causes abnormal increase of cylinder temperature and aging of sealing ring.

7. Oil leakage often occurs when the pressure range of the cylinder is exceeded.

Second, internal leakage

1. The wear ring on the piston is seriously worn, which results in friction between the piston and the cylinder liner, and finally damages the cylinder liner, piston and seal.

2. Seals are invalid for a long time and piston seals (mostly U, V, Y rings, etc.) are aging.

3. Hydraulic oil is dirty, a large number of impurities enter the cylinder and wear the piston seal to a bad state, usually iron scraps or other foreign bodies.

Cautions in the Use of Hydraulic Cylinders

1. In ordinary use, we should pay attention to protecting the outer surface of the piston rod to prevent the damage of the sealing parts caused by bumping and scratching.

It is necessary to clean the sediment on the dustproof ring and bare piston rod of the dynamic seal of the cylinder regularly, so as to prevent the dirt which is not easy to clean from the surface of the piston rod from entering the inner of the cylinder, thus causing damage to the piston, cylinder or seal.

2. In normal use, pay attention to check the connecting parts of threads, bolts and so on frequently, and find loosening and fasten immediately. Because loosening of these places can also cause oil leakage of hydraulic cylinders.

3. Frequently lubricate the joints to prevent rust or abnormal wear in oil-free condition. Especially for some parts with rust phenomenon, it should be treated in time to avoid oil leakage of hydraulic cylinder caused by rust.

4. In normal maintenance, the hydraulic oil should be replaced regularly, and the filter screen of the system should be cleaned in time to ensure the cleanliness of the hydraulic oil, which is also very important for prolonging the service life of the hydraulic cylinder.

5. In normal work, attention should be paid to the control of system temperature, because high oil temperature will reduce the service life of the seals, and long-term high oil temperature will cause permanent deformation of the seals, and seriously will make the seals invalid.

6. Usually when we use it, we have to make a full-scale and full-scale trial run for 3-5 journeys before we work. The purpose of doing this is to exhaust the air in the system and preheat each system, so as to effectively avoid the existence of air or water in the system, which will cause gas explosion in the cylinder block, which will damage the seals and cause leakage and other faults in the cylinder.