I haven't had too much trouble, but I got in there early when the high low shift was acting up and found that the shaft that controls the shift fork didn't have a location hole drill in the right place so, I think it was, the low speed wasn't totally engaging. With the plastic gear that could have been an early failure. I made a new shaft to correct that. When I was in there I noticed that the light grease they were using had mostly been thrown off the gears. I found some grease from Petro-Can that had a high adhesive value and have been using that ever since. For anybody that is interested it is called G124 grease and it comes in cartridges. I use it on the change gears in the lathe also. In there it stays on the gears and doesn't get thrown onto the belt.