SPRING AS-GAS 2256870 - Caterpillar

Necessary parts
Table 1
Idler Guards    
Item     Part Number     Description     Qty    
1     155-2742     Guard As     4    
2     163-2415     Guard As     2    
3     155-2754     Plate     2
(1)    
4     7X-0345     Bolt     12    
5     8T-4122     Hard Washer     18
(2)    
6     8T-6871     Bolt     6
(3)    
7
(4)     163-2415     Guard As     2    
8
(5)     155-2757     Bar     4    
9
(5)     155-2756     Bar     2    
( 1 ) If you are installing the front idler guards on the D8R (S/N: AKA1213-UP; 6YZ325-329 and 331-UP; 7XM5094-UP; 9EM1213-UP), order four plates.
( 2 ) If you are installing front idler guards on the D8R (S/N: AKA1213-UP; 6YZ325-329 and 331-UP; 7XM5094-UP; 9EM1213-UP), order twenty-four hard washers.
( 3 ) If you are installing the front idler guards on the D8R (S/N: AKA1213-UP; 6YZ325-329 and 331-UP; 7XM5094-UP; 9EM1213-UP), order twelve bolts.
( 4 ) Only use the item for installing front idler guards on the D8R (S/N: AKA1213-UP; 6YZ325-329 and 331-UP; 7XM5094-UP; 9EM1213-UP).
( 5 ) Only use the item for retrofitting the rear guards on the D8N (S/N: 5TJ1-UP; 1XJ1-UP; 9TC1-UP; 7TK1-UP) .Installation procedure for Rear Idler Guard
Illustration 1 g01018161
Note: If you are installing the rear idler guards on the D8N (S/N: 5TJ1-UP; 1XJ1-UP; 9TC1-UP; 7TK1-UP), complete Step 1.
If your machine does not have bars (8) and (9), weld bars (8) and (9) to roller frame (D). Refer to Illustration 1 and Table 2 for additional information.
Table 2
Rear Idler Guard    
Item     D8N (S/N: 5TJ1-UP; 1XJ1-UP; 9TC1-UP; 7TK1-UP)    
A    
178 1.5 mm (7.008 0.06 inch)    
B    
91 mm (3.583 inch)    
C    
35 mm (1.38 inch)    
Illustration 2 g01018159
Note: If your machine is ready for idler guards, complete the remaining steps.
Install two guards (1) on rear roller frame (D).
Install six bolts (4) and washers (5) in order to attach guards (1) to rear roller frame (D) .
Approximate torque for bolts (4) is 215 40 N m (160 30 lb ft).
Install rear guard assembly (2) on rear roller frame (D) .
Install plate (3) to guard assembly (2) .
Install three bolt (6) and three washers (5) in order to attach guard assembly (2) and plate (3) to rear roller frame (D) .
Torque bolts (6) to 115 20 N m (85 15 lb ft).
Repeat Steps 2 through Steps 8 on the opposite track roller frame.Installation Procedure for Front Idler guard
Note: If you are installing idler guards on the D8N (S/N: 5TJ1-UP; 1XJ1-UP; 9TC1-UP; 7TK1-UP), a retrofit kit is not available for the front idler guards. Idler guards may not be installed on the front Idlers.
Illustration 3 g01018160
Install front guard assembly (7) on front roller frame (E) .
Install plate (3) to guard assembly (7) .
Install three bolt (6) and three washers (5) in order to attach guard assembly (7) and plate