COVER 4N0071 - Caterpillar

The original 6N1078 Bearing used at the front end of the housing is available for parts service because it is used in other applications, but is not to be used for replacement in this application. The 5P4810 Bearing, used for replacement of the 6N1078 Bearing, is not completely machined; the bore must be machined to size after the bearing is installed. Complete details for bearing installation and machine work are given in Special Instruction Form SMHS6735, which is sent with each 5P4810 Bearing.
A correction must be made to Special Instruction Form SMHS6735. On Page 3 of the form, Step 5 gives a bearing bore dimension of 25.4127 .013 mm (1.005" .005"). Change this dimension to read: 25.413 .013 mm (1.0005" .0005").The 8N628 Bearing, used for replacement of the original 4N3711 Bearing at the governor end of the housing, does not need to be machined, but must be installed with the groove in the correct radial position. Specific information about installation of this bearing is given in Special Instruction Form SMHS7343, which is sent with each 8N628 Bearing.