0397373 JOHNSON BRUSH & SPRING SET

Introduction
This Special Instruction contains the procedures to replace the old engine alternator mounting groups with new engine alternator mounting groups. This change will help prevent vibration damage present in the old alternator mounting group design.Note: If the engine in question has a support assembly that is not cast iron, the following additional parts will have to be ordered, 6L-7283 Bolt , 7X-0339 Bolt and 9S-8752 Full Nut Safety Section
Do not operate or work on this engine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility.
Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
Change from the Old 118-3419 Alternator Mounting Gp to the New 449-4904 Alternator Mounting Gp
Disassembly of the 118-3419 Alternator Mounting Gp (Old)
Illustration 1 g03478246
Table 1
Items to Remove from the Engine    
Item Number     Part Name     Status    
1     Nut     Retain for reassembly    
2     Washers     Retain for reassembly    
3     Bolt     Retain for reassembly    
4     Washer     Retain for reassembly    
5     Bolt     Retain for reassembly    
6     Support bracket     Discard    
7     Nut     Retain for reassembly    
8     Washers     Retain for reassembly    
9     Bolt     Retain for reassembly    
10     Washer     Retain for reassembly    
11     Bolt     Discard    
12     Lock Nuts     Retain for reassembly    
13     Block     Retain for reassembly    
14     Adjusting Rod     Discard    
15     Nut     Retain for reassembly    
16     Washers     Retain for reassembly    
17     Washers     Retain for reassembly    
18     V-Belt     Retain for reassembly    
Remove the V-belt
Remove the alternator mounting hardware and adjusting rod indicated in Illustration 1.Note: Retain specified hardware for reassembly.Assembly of the 449-4904 Alternator Mounting Gp (New)
Illustration 2 g03479597
Illustration 3 g03485322
Alternator support group (Typical example for all new group mountings) (7) 1F-7958 Full Nut (1/2"-13) (8) 4Y-3046 Washer (Hard)
3 mm (0.12 inch) (9) 437-7746 Mount (Rubber Isolator) (10) 5P-8245 Hard Washer
3 mm (0.12 inch) thick
(11) 9H-8260 Bolt .
Table 2
Parts Needed to Assemble the 449-4904 Alternator Mounting Gp    
Item Number     Number of Parts Needed     Status     Part Number     Description    
1     1     Reuse from 118-3419 Alternator Mounting Gp     9S-8752     Full Nut    
2     2     Reuse from 118-3419 Alternator Mounting Gp     5M-2894     Hard Washers    
3     1     Reuse from 118-3419 Alternator Mounting Gp     6L-7283     Bolt    
4     1     Reuse from 118-3419 Alternator Mounting Gp     5M-2894     Hard Washer    
5     1     Reuse from 118-3419 Alternator Mounting Gp     1A-5964     Bolt    
6     1