Sitting on tractor, the rear tire behind you on left side. Look behind the tire down low and you will see this bolt. Above the bolt is a small bolt that takes a 12MM socket to remove. This small bolt is holding a small rectanguler flat plate that comes down and fits in a slot that holds the big bolt in place. Remove the small bolt and plate. Then grasp the big bolt and pull it out. I had to work mine out with the tip of a screw driver and then work it back and forth till it comes out. Could use big pliers. When it comes out it has the screen that looks like a cigar attached, all one piece.
Your fluid will start coming out when this is most of the way out so have a tapered plug that's from 1/2" at smallest end up to at least 1" if your not replacing the hydraulic fluid and stick it in the hole. If your replacing hydraulic fluid, forget plug and let it flow into your catch pan unless you've already drained all of the hydraulic fluid. Wipe screen off and make sure nothing on it. If it's gunked up then clean it with gas or some other solvent. Pull stopper plug out of hole, if it's in, and stick the cigar back in the hole. Start keeper bolt with flat plate coming down and make sure the flat plate is in the slot, turn cigar bolt head if the flat plate isn't in the slot, tighten..... then tap cigar head with a hammer to make sure fully seated then finish tightening keeper bolt. Took some pictures of screen bolt and hope they help. I didn't take pictures the other day of screen because I was having to hold my to small plug in with one hand.