BOLT 2N6319 - Caterpillar

Procedure for Bearing Service
Perform periodic bearing lubrication at the required intervals. Use the following instructions as the suggested procedure in order to service the bearings of the generator.
Illustration 1 g03719708
(1) grease zerk for the front generator bearing
Illustration 2 g03719804
(2) grease zerk for the rear generator bearing
Stop the generator set. The grease zerk for the front bearing (1) is located on the front bearing bracket. The grease zerk for the rear bearing (2) is located on the rear of the terminal box.
Use a Cat® 8F-9866 Grease Gun or equivalent grease gun to grease the bearings. Use 68.0 g (2.4 oz.) of polyurea-thickened grease ( 454-0291) per bearing. Avoid the use of alternate types of grease. Usage of alternate types of grease could cause premature bearing failure. Note: Add only the amount of grease listed previously. Do not continue to add grease until purging is observed. Purging of grease will not always be observed.Note: Do not allow grease to drip on the stator windings of the generator. The stator windings that are exposed to grease could suffer degraded insulation. The degraded insulation would cause a reduction in the life of the windings.
Operate the generator set at rated speed for approximately 1 hour. When running the engine more than 30 minutes, the recommended engine load to apply is a minimum of 50%. The procedure will allow the grease to expand. The expanding grease will force the excess grease from the cavity. The internal pressure will be reduced as the excess grease is forced from the cavity.
Stop the generator set. Inspect the generator windings, grease tubes, and bearing housings. Wipe off any excess grease. Wipe off any excess grease. Note: Do not allow grease to drip on the stator windings of the generator. The stator windings that are exposed to grease could suffer degraded insulation. The degraded insulation would cause a reduction in the life of the windings.
Install all of the external cover plates, grills, and louvers of the generator that were removed in order to access the bearings. Bearing Replacement
Refer to the appropriate publication for each specific generator for bearing replacement procedures.Replace both bearings of a two-bearing generator.Replace any bearing wear sleeves and lip seals when the bearings are replaced.Except for the 341-7383 Ball Bearing, replacement bearings are pre-lubricated. The pre-lubricated bearings do not require additional grease at time of replacement. The 341-7383 Ball Bearing is shipped as a dry bearing. The 341-7383 Ball Bearing must be packed to 50% grease fill at time of installation.Old grease must be removed at the time of bearing replacement from the bearing bracket cavity. After the bearing bracket cavity is cleaned, the bearing bracket cavity must be packed with new grease from one-third to one-half full.Note: Generator set alignment is required after the bearings are replaced.Additional Information
Refer to Special Instruction, REHS4892, "Generator Bearing Service" for further information.