The reason why the hydraulic cylinder is stretched out but cannot be retracted:
1. When the hydraulic pressure is designed, the area of the rod cavity is too small, so that the desired return force cannot be achieved during the return stroke.
Second, the problem of the seal, if there are two sealing rings on the piston, it means that the upper sealing ring is broken.
If you buy it, you need to have a foot check. You can first check whether the coupling is damaged; then check whether the overflow valve in the oil block is blocked. Another is that if a room has been used for too long, it needs to be cleaned. The hydraulic oil is very dirty and blocks the oil circuit block. Electromagnetic reversing valves can also be checked, but the probability of problems is relatively small, unless there is a product problem.
The above is about the reason why the hydraulic cylinder can not be retracted when it is stretched out. I hope it can help you!
