I have a L3800 hydro stat and it is great. This fall I moved fire wood and the rear wheel was spinning I stopped pressed down the differential lock and it pulled out. I disengaged it before the drive way and used it a couple of times since then. Last snow I tried it and it did not want to go in. I was in low at a stop and tried to work it in slowly in reverse and forward, no luck. Today I tried it and it went in and popped out within 15 feet going forward no turns and it will do this in 2wd and 4wd. Anything I missed here? Like I said pressure pushing down on the rear differential lever slow forward movement and if it goes in it comes out.