GEAR AS 2941729 - Caterpillar

following maintenance procedure for generator bearings should be followed:
Remove the bearing bracket. Inspect the following items: bracket bore, bearing outer race and rolling elements. On standby power units, the bearing must be inspected and the grease must be replaced at 3 yr intervals. The sleeve in the bearing bracket should be inspected for out of roundness, excessive wear, and a bracket step that is less than 0.0762 mm (0.0030 inch). If there is no sleeve in the bearing bracket, inspect the bore of the bearing bracket. The bearing should be inspected for damage to the outer race, severe fretting, and smoothness of operation. When possible, the bearing elements should be inspected. Some double shielded ball bearings prevent visual inspection of the elements of the bearing. Other double shielded ball bearings have a retaining ring. This retaining ring can be removed in order to allow access for a visual inspection of the elements of the bearing.On two-bearing generators, the front bearing can only be removed after the hub is removed. In order to remove the hub, refer to Systems Operation Testing and Adjusting Disassembly and Assembly, KENR5284.Note: Bearings that are being removed for failure analysis should not be cut off with a torch.
All ball bearings should be cleaned. The cavity in the bracket should be repacked with 2S-3230 Grease. Pack the ball bearings (one-third to one-half of the volume of the cavity). To reinstall the ball bearings, use an induction heater to heat the ball bearings to 107 °C (224.6 °F) for 10 minutes. Mount the bearings on the shaft. To reinstall the hub, heat the hub to 400 °C (752.0 °F) for 3 hours. Mount the hub to the shaft.
Ensure that the tube of the grease gun is filled with grease.
Remove the bracket drain plug and operate the generator for 1 hour. Operating the generator will allow the grease to expand. The expanding grease will force the excess grease from the cavity. When the excess grease is forced from the cavity, the internal pressure will be reduced. The generator should continue to operate until the grease stops purging.
Stop the engine. Install the bracket drain plug. Wipe off the excess grease.
For greasing intervals, follow the recommendations on the lubrication plate (if equipped) or refer to Maintenance Schedule, "Generator Bearing - Lubricate". Whenever the bearings are greased, repeat Step 4. DO NOT MIX GREASES.For additional information, refer to Special Instructions, REHS 4892, "Generator Bearing Service".Refer to this Operation and Maintenance Manual, "Generator Bearing - Lubricate" for specific generator bearing information.