WASHER 8W4557 - Caterpillar

The ball bearings that are used in the generators contain grease. This grease is subject to deterioration. If the generator is stored more than one year, without rotating the rotor, new ball bearings may be required. These bearings are greased at the factory. These bearings do not require any additional greasing in the field. Remove any necessary covers in order to inspect the rear bearings of the generators. Front bearings may be inspected through the fan screen. Perform a visual inspection for obvious damage, for corrosion, or for an excessive amount of purged grease around the bearing sleeves. Small amounts of purged grease are expected. Grease that covers the brackets or the windings is excessive.Bearing inspection should include the collection of vibration data. Refer to this Operation and Maintenance Manual, "Generator Set Vibration - Test/Record" for further information concerning checking the vibration levels.Bearing temperature should also be measured and recorded as a part of this inspection. Refer to this Operation and Maintenance Manual, "Generator Bearing Temperature - Test/Record" for further information concerning checking the vibration levels.If inspection indicates that bearings are free of rust or corrosion, and no noise or excessive vibration occur on start-up, replacement is not necessary.