B2401 loader valve

[gbaker53]

I finally found a good picture of the control valve used on the B2401 tractor. The bolt I have a question about is the one that is in the lower right corner. I am wondering if it is a inlet port for the low pressure return? If someone can help me with that I would greatly appreciate it. If you can let me know what size and threads are on it and I will use it as my low pressure fluid return from the hydraulic control valve. Thanks

 

[Fedup]

If you have this valve, why not just remove the plug and see what it is? From here it looks like an allen head pipe plug. Possibly 1/4"? Then stick a small screwdriver through the hole and see if it goes into the next passage where the fitting is installed. How hard can it be?