Bad HYD fluid leak.

That is a single acting cylinder. It is only under pressure while it is extending. The piston gets pushed back in by the force from the opposite cylinder.

That weep hole is used to expel any trapped fluid that might leak past the piston seal. This is to protect the wiper seal on the rod from being blown out.

You most likely have a blown piston seal inside and the cylinder would have to be taken apart to replace it. If it is even possible to take it apart. From the picture I can’t tell if the there is a gland nut on the rod end.

Finding parts may be difficult, and most likely you would have to remove the cylinder and take it apart so the seals and rings can be measured.

A good hydraulic shop should be able to do all that, but be prepared to pay $$ for it. Some shops won’t even look at a cylinder like this.

More than likely unless you do the work yourself the repair will cost more than a new cylinder. I would check with any of the online Jinma dealers to see if they can help.

My favorites are Circle G Tractor and Affordable Tractors.

Is that a steering cylinder? I know this is apples and oranges but a factory seal kit for my log splitter was 200 bucks, I measured and guessed and got a generic repair kit off amazon 10 bucks perfect fit. so it might be well worth measuring and doing some searching around. oh what tractor is that on?