GEAR-RING 6P2473 - Caterpillar

Note: For detailed generator bearing information, refer to Special Instructions , REHS4892 , "Generator Bearing Service".The 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. Check the bearing bracket sleeve 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 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. To remove the hub, cut off the hub with a saw. Do not use a torch to remove the hub. Do not pull on the hub. Pulling the hub will damage the shaft.Note: Bearings that are being removed for failure analysis should not be cut off with a torch.
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.