I checked a little closer and the front end is actually engaged so I'll probably just leave it alone as I'd like to have it working to push snow. There is a box under the transmission that I think I can drop to fix it if need be.
I just acquired a Yanmar 226d, not sure what year. The 4x4 is not engaging, the lever feels like it's just free swinging. Could there be a pon sheared off inside? Also the pto works in 540 rpm but not 1000.