Friends engaged in construction machinery must be often troubled by the problem of oil leakage in the hydraulic cylinder. For excavators, once the hydraulic cylinder leaks, there will be slow lifting and insufficient digging force. This greatly affects the normal work of the excavator and reduces the work efficiency. Today we will understand the reasons for the oil leakage of the hydraulic cylinder of the excavator?

External leakage

1. The sealing damage between the extension end of the piston rod and the piston rod is mostly caused by the roughening of the piston cylinder and also caused by aging.

2. The seal between the extension end of the piston rod and the cylinder liner is damaged. This is mostly caused by the aging of the seal after long-term use. There are also many damage to the seal when the upper end cover is used too hard. There are also many domestic production hydraulic cylinders. The manufacturer's design is unreasonable. In most cases, the manufacturer is to save costs.

3. Cracking of the oil cylinder inlet and outlet pipe joints will also cause leakage of the hydraulic oil cylinder.

4. Oil leakage caused by defects on the hydraulic cylinder block or cylinder end cover.

5. The piston rod is strained, grooves, pits, etc.

6. The deterioration of lubricating oil makes the temperature of the hydraulic cylinder rise abnormally, which promotes the aging of the sealing ring.

7. Oil leakage caused by frequently exceeding the pressure range of the hydraulic cylinder.

Internal leakage

1. The wear ring on the piston is severely worn, causing friction between the piston and the cylinder liner, and finally straining the cylinder liner, piston and seal.

2. The seal fails in long-term use, and the piston seal (mostly U, V, Y ring, etc.) is aging.

3. The hydraulic oil is dirty, and a large amount of impurities enter the oil cylinder to wear the piston seal to the point, which is generally iron filings or other foreign matter.