Purchased a Kubota L 3301 DT. Now has 111 hrs. Now my problem.....it has a tier 4 emissions system. Had I known about it I wouldn't have bought it. Tractor is fine otherwise. Is there a way to remove the tier 4 without ruining the tractor. The buttons on the dash don't seem to do anything. Tractor goes into emission mode every 12 or so hours and then 20 min. to shut down. I want to shut down and walk off when I finish with it instead of waiting 20 min.