The tow valve on the C161 I picked up recently is stuck. I need to free it up so I can at least roll it around to work on it. Currently the tractor doesn't run so i'm not sure what shape the transmission is in. I drained the oil and it was a little dirty, but no water or sludge. I've only used a short 1/4" wrench as I didn't want to force it. the The tractor is quite weathered. i have the seat pan off so i have better access to the valve stem, and have been spraying some Kroil on it.
Should I grab the stem with something like a vice grip (to get a steadier grip) and cautiously use a more force to wiggle it back and forth?
Is there anything minor I can disassemble to get some diesel inside to soak it?
Could this be a sign of something going on in the transmission,