1. First of all, the upper mold and the hydraulic cylinder cylinder rod to disassemble, so that the upper mold and the hydraulic cylinder cylinder rod detached. (The upper mold needs to be well-padded)
2. It is best not to change the seal of the hydraulic cylinder online, (because it is too dirty, and quite not easy to operate), the hydraulic cylinder as a whole removed (the picture you sent is not very clear to see, it may be the flange connection), placed in a clean and dust-free site. (Be sure to unpressurize the cylinder before disassembly, and if the hydraulic cylinder rod is placed in the highest position, there should be appropriate measures to prevent the cylinder rod from falling after unpressurization).
3. Remove the rear cover of the hydraulic cylinder, pull out the piston and piston rod, remove the front cover, at this time, the hydraulic cylinder seals can basically be presented in front of you (some hydraulic cylinders only front cover, the reason is similar). Do you want to replace the piston rod seals? The seal on the piston? The seal on the end cap? The seal on the cushion? The seal on the exhaust valve?
4. There are many kinds of seals, the common ones are basically: Y-ring, Yx-ring, V-ring, Gerai seal, Stefan seal, there are some combination seals, (O-ring and combination cushion will not be mentioned), and there are some with the seal with the use of the guide ring and dust ring. Depends on which place you want to change the seal, if you are experienced enough, then you can choose your own seal according to the hydraulic cylinder seal groove size and the original seal with the same specifications of the seal (there are a lot of manufacturers on the market to do the seal, each manufacturer's model is not the same, but the reason is the same). If you are not too familiar with, it is best to find a professional seal manufacturers to do, and provide guidance (some seals need to be installed hot), and after installation, but also with the pressure equipment for pressure test, which is very important! This will test the success of the fruits of your labor!
5, in accordance with the order of removal of the hydraulic cylinder can be installed, there are many details, pay more attention.
Note: Inexperienced, must be guided to work, otherwise the economic loss is small, the loss of security is a big thing.