Most machines in industrial manufacturing utilize C3 fits. Factors that determine bearing clearances include: the fit, the type of bearing, and the diameter of the shaft. With a C3 fit and a 1" diameter shaft, the clearance is between .5 thou and 1 thou.With a C3 fit and a 4" diameter shaft, the clearance is much larger;between a thou and 2.5 thou. Because of bearing clearances, the shaft can be displaced both radially and axially.
First, we inspect the gearbox motor frame assembly for any damage that may have occurred during shipment. Clean the gearbox motor frame assembly if needed now and during maintenance. Do not allow chemicals on the seals as they can cause seals to deteriorate and leak.
To insure the proper amount of oil, mount the gearbox motor frame assembly , determine the vent plug, gauge and drain plug locations and fill or drain the oil to the proper amount recommended in the user manual. It is very important to use the proper lubricant when adding or changing the oil. Recommended oil types and brands are specified in the user manual.