I have been busy so didn't notice 330 hrs on my C machine since last PM. 330 hrs ago, Feb or 2015, I had to replace I had to replace the Y motor assy. because the encoder was failing. Today I replaced the cut motor brushes- and they needed it - and the Y bearings - and they did not need it. The old Y had elongated holes for the motor mounting so the gear clearance could be adjusted. the new one has hole just the right size to fit the screws. With the small gear tight up against the large one, the motor bearings seem to be taking some of the load off the cantilevered Y gear bearings. When I do maintenance like this, I write the hours and action on masking tape ( I use the tan stuff - it is sticker than the blue) and attach it to the other end of the machine.
Clint