I have an L245DT and when I was pushing back some snow banks this morning I think that the 4wd might not be engaging. In my pickup if you're in 4wd and you get stuck, and you're giving it gas it will jump around a bit as all 4 wheels are trying to move you. But with the tractor, if I get up against the snow bank and it doesn't want to move it the tractor just stops. I can rev it till the cows come home, it just doesn't seem to even try to move. I haven't owned any tractors prior to this, so maybe this is normal? Im thinking not. Does anyone have any advice?