Hitachi ZX200 was overhauled. The fault was that the hydraulic cylinder of the excavator leaked, which caused the excavator to fail to operate normally. The leakage of the hydraulic cylinder of the excavator is actually a failure encountered by many owners. What are the reasons for the leakage of the cylinder? Next, the master will analyze the excavator Xiaobai. Under normal circumstances, the leakage of hydraulic cylinders is divided into internal leakage and external leakage. As long as we observe carefully, we can determine the cause of the leak.
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. There are also many damages caused by the pressure on the upper end cover. There are also many manufacturers that produce hydraulic cylinders. The design is unreasonable. Caused.
3. Cracking of the oil cylinder inlet and outlet pipe joints will also cause the leakage of the hydraulic oil cylinder.
4. Oil leakage caused by defects on the cylinder body or on the cylinder end cover.
5. The piston rod is strained and has grooves, pits, etc.
6. The deterioration of lubricating oil makes the temperature of the oil cylinder rise abnormally, which promotes the aging of the sealing ring.
7. Oil leakage caused by frequently exceeding the pressure range of the oil 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 for a long time and the piston seal is aging.
3. The hydraulic oil is dirty, and a large amount of impurities enter the oil cylinder to wear the piston seal to a bad value.
Leakage of hydraulic cylinder is bound to cause serious damage to the excavator. When the excavator driver is operating the excavator, once he finds that the excavator has a task failure, he should investigate it as soon as possible.
