MT 372 Gear case spewing lube

[skylarkguy]

I've got an MT372. I had been using it all summer with no problems. It then sat for several months under cover. Recently I started it with no problems but as I started driving gear lube started flowing out of the rubber boot on the shift lever. I pulled the filler plug out (while running) and it came shooting out of that hole too. So clearly the gear case is building up pressure for some reason. Any thoughts? I was running a brush hog at the time, and had put on ag tires from turf, which is the only change I'd made recently. It seem this must have a vent in it somewhere that is plugged...but where?

 

[oliver28472]

Has it been rained on? Could have water in the case.

 

[skylarkguy]

Thank for the Idea. It hasn't been in the rain. It gets parked under a metal shed which stays dry (even in Oregon winter). The gear oil looks good...not cloudy or gray like it is contaminated with water.