DavidPrivett

I went to tractor supply and got pioneer brand off the shelf. They got the different  colored dust caps too. But I do not have a loader on my tractor they were used on the remotes. I believe they are the same.

I am kinda leaning on the over pressure relief with the system disconnected from the loader and you are not activating any controls and you blow a seal what else could it be? The only thing else would be the valve body activating pressure when it should not be and not bypassing. I guess.

you might want to ask around to see if anyone you know has a diesel engine compression gauge that would give you some info. so you can figure this out. Harbor freight used to have them less than 100.00 if I remember right.

yeah you need to take care of this now think about it overheating it in august time wise. I know it has been wrote about before but in case you missed it take some 3/8  hard copper and bend a slow 90 degree bend in( it or use a premade elbow) and squish the end to make a fan spray attach what ever fittings to hook it to a garden hose and use it to spray from the fan  outward  thru the radiator reversing the flow of normal air with water you should get more junk to come out that is lodged in cooling fins. of course tractor OFF. This is a part of normal maint. to keep cooling system in good shape.