PISTON A. 6B2263 - Caterpillar

Repair Procedure to Improve the Side Clearance
Select the desired shims from 272-2033 Idler Kit .
Adjust eight places of clearance of the Idler bearing within 3 mm (0.12 inch) maximum clearance by using shims.
Weld the Shims with a 3 mm (0.12 inch) weld length. Refer to Illustration 1.
Table 5
Adjusted Side Clearance of Idler Bearing    
Model     Effectivity     Adaptability    
307C     S/N:BNE798-UP     S/N:BNE1-797    
S/N:BCM1099-UP S/N:BCM1-1098    
308C CR     S/N:KCX715-UP     S/N:KCX1-714    
Illustration 1 g01276877
Repair Procedure to Increase the Strength of the Track Guard
Install 272-2032 Plate (1), 272-2031 Plate (2) and 272-2030 Plate on the idler support. Refer to Illustration 2.
Weld plate (1), plate (2) and plate (3) with an 8 mm (0.32 inch) weld length.
Table 6
Increased Strength of Track Guard    
Model     Effectivity     Adaptability    
307C     S/N:BNE829-UP     S/N:BNE1-828    
S/N:BCM1170-UP S/N:BCM1-1169    
308C CR     S/N:KCX829-UP     S/N:KCX1-828    
Illustration 2 g01276003
Repair Procedure to Improve the engagement of the Idler with Track Links
Install two 292-3911 Rings per wheel to the existing idler wheel in order to increase the engagement with the track. Refer to Illustration 3.
Table 7
Improved Engagement of the Idler with Track Links    
Model     Effectivity     Adaptability    
307C     S/N:BNE1467-UP     S/N:BNE1-1466    
S/N:BCM1613-UP S/N:BCM1-1612    
308C CR     S/N:KCX1584-UP     S/N:KCX1-1583    
Illustration 3 g01276960
Repair Procedure to Increase the coverage of 276-0978 Track Guide Guard Gp as an Optional Attachment for Steel Tracks.
Add tapped holes to the undercarriage in order to enable the center guiding guard to be installed. Refer to the following Illustrations for the position of the holes for the track guiding guard.
Table 8
276-0978 Track Guide Guard Gp    
Model     Effectivity     Adaptability    
307C     S/N:BNE1191-UP     S/N:BNE1-1190    
S/N:BCM1407-UP S/N:BCM1-1406    
308C CR     S/N:KCX1241-UP     S/N:KCX1-1240    
Illustration 4 g01276989
(1) 276-0979 Track Guide Guard As (2) 8T-4192 Bolt (3) 8T-4223 Hard Washer