The cause of oil leakage of hydraulic components is very complicated. Some new ones leak oil, but some have not leaked oil for more than ten years. The problem of oil leakage can be completely solved, but the causes and ways of oil leakage must be found out. The typical examples of oil leakage are as follows
1. Oil leakage of hydraulic pump
The finished hydraulic components are not allowed to leak oil, but due to various reasons, the new factory hydraulic pump leaks oil from the journal when the oil temperature reaches 50 degrees in the process of carving the pump station.
From the analysis of the oil leakage, the oil leaks from the low-pressure cavity, that is, a large amount of oil from the pressure cavity to the low-pressure cavity. Because there is a certain back pressure in the system, some oil is exposed to the outside. The reasons are as follows.
1. Causes of oil leakage at the oil diameter. It is common for various hydraulic pumps to leak oil from the drive shaft, especially the self-tightening rotating rubber sealing ring in the journal end cover of the gear pump.
a. The axial clearance of the pump exceeds the specified value, and a large amount of pressure oil enters the low pressure area, which flushes the self-tightening rotating rubber seal ring to leak oil outward.
B. The hydraulic pump is worn in the system all the year round, which increases the axial gap, and a large amount of pressure oil enters the low pressure area, which will flush the rotating sealing ring and leak oil outward.
C the newly processed and assembled hydraulic pump, due to the geometric dimension deviation of a certain part in the processing and manufacturing exceeds the specified value; it is also possible that the cumulative dimensional deviation of several components exceeds the specified value. In order to prevent oil leakage at the shaft extension, two self-tightening rotating rubber seals are installed at the journal when designing the gear pump.
2. The method to solve the oil leakage at the journal The cause of the oil leakage at the journal is mainly caused by the excessive axial clearance.
a. The newly installed hydraulic pump leaks oil during the adjustment process, which is caused by the poor manufacturing quality of the hydraulic pump. The manufacturer can be found to replace it so that the unit does not disassemble and repair it, and the repair is not good.
B. Long-term use of the gear pump leakage, can be self-maintenance.
2. Oil leakage of hydraulic cylinder
The hydraulic cylinder usually does not leak oil, and only after long-term use and wear of the movement seal can there be signs of oil change. If the processing quality is not qualified, the hydraulic cylinder will also leak
When assembling the hydraulic cylinder, the front end of the inner hole of the cylinder barrel, the front end of the piston rod, the outer circle and the inner hole of the guide sleeve should be coated with clean lubricating oil, and the pressure should be pressed down carefully and slowly. This assembly method is to overcome the oil seal is not an important part of the loss.
The displacement method of the customer service hydraulic cylinder without oil leakage is that the movement in the guide sleeve seals the fixed oil seal of the outer ring from damage.