I believe the left side gearbox if your standing behind the cutter has bit the dust on me. I was using it and suddenly started making a bunch of noise. I shut it down and checked it and it was very hot. Sure enough the seal went and it ran out of oil. Let it cool and I put grease in it and a some oil just to mix it well. When I started it back up it was nice and quiet just as it should be. Well after 10 minutes or so it started making noise again. I checked it while it was running and could see the input shaft from the center gearbox has a good bit of play in it. Any of you guys ever rebuilt on of these on this model? Any advice?