How to fix leakage in hydraulic cylinder?

[Emmanuel Henry]

Any hydraulic system experts here? There is a serious leakage in my tractor's hydraulic cylinder. It is the first time I am experiencing such a problem in my tractor. The previous owner used to weld the leaking area. The leakage was appeared on yesterday. Is it possible to apply a sealant in that area? Or do I need to visit any hydraulic system specialists like xxxxxxxxxxxxxxxxxxxxxxx. Looking for advice from industry experts.

[Kelly_Bramble]

How to fix leakage in hydraulic cylinder? - The previous owner used to weld the leaking area.

Remove and replace the hydraulic cylinder.... seriously.

[jboggs]

Ditto!

[Hosam]

What's the application?

[akashram]

we can perform a matter of disassembling, inspecting, repacking the seals, and reassembly. If you’ve pulled the leaky shaft from your equipment and disassembled it, you need to inspect it thoroughly to identify the problem. Common issues are leaking seals, scratches or pits on the cylinder bore, and bent rod. If your problem is a scratch, gouge, or pitting in the cylinder bore or you have a bent piston, you’ll need specialty equipment to perform the repair.
When re-packing the seals on your hydraulic cylinder, be sure to first clean all new parts in a petrolatum-based solvent and dry them using compressed air. Thoroughly inspect the new seals and be sure they are clean. Coat them with hydraulic fluid and seat them in the correct order. NEVER use a screwdriver or other metal object to seat a new seal. This can cause damage to the seal, and then you’ll be right back where you started with a leaking cylinder.
Once you’ve replaced the seals, loosen the input valves and size the piston seals back down before you gently slide the piston back into the cylinder. At that point, if you can’t move the cylinder back and forth easily, pull the piston back out and check to see if the seals are all in the right place.
Once the seals have been replaced, it’s time to test your work. We recommend that you pressure up the cylinder with air and spray soapy water around the rod next to the barrel. If there are no bubbles, there is no leak.