I will send you to another thread to help you out
I have an l235dt that I picked up in the summer. It didn't have many hours on, but was outside most of it's life. I have changed all fluids and filters, and the dual stage clutch as well. It has started to become a frankentractor...as I was searching for a loader, I came across a John Deere...
www.orangetractortalks.com
Read through it and it should show how to hook into the hydraulics on your tractor.
The red plug on top of the transmission case is a return port to use to dump the tank return from the cylinders into. I think the threads may be damaged though. The original threads on my similar L185 for that similar port were BSPP straight threads that used a sealing washer. That red plug appears to be standard NPT that fit into the hole. There might be undamaged threads left to use a correct fitting. It probably won’t matter much either way since it will probably seal well enough since there is very little pressure on that tank return line.
The pressure take off seems to NOT be where you are circling at the blue plug. But the cover on top of that can be replaced with a machined block that will give you the access to the hydraulic fluid pressure and continue it on its way to the three point hitch.
Read the first post of this thread that describes the way a block is added to tap into the hydraulics on many older Kubota models. You do NOT have that but it would be in the metal tube that runs across the top of the transmission in your picture. Some L245 did have that block.
CURRENTLY SOLD OUT. Making more is a winter project. I will remove this line when I have made more. These are obsolete and no longer available. I have recently been contacted by a member asking if I will make him one of these after reading how I made mine. I know this comes up from time to time...
www.orangetractortalks.com
I will also ask
@TheOldHokie to comment since he also sold that block for some time. He may have dimensions for your block also. For sure he can confirm where to tap into the hydraulic system on the tractor. It can be done by simply cutting into that metal line but I can understand the reluctance to do that.