What's the matter with the bottom seat of the hydraulic cylinder and the oil on the outside?

How does the bottom seat of the hydraulic cylinder always go out and take the oil out of the oil, so how do we fix the hydraulic cylinder?

Problem solving: the base and the cylinder body connection. Generally connection in the "type rubber sealing ring not been compacted or damaged, replace the latter, rotation will base and the cylinder body are separated, remove the sealing ring reloaded with new sealing ring after it is put on. Notice that the hydraulic oil is discharged into the container, and then the oil is injected into the tank.

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