GASKET-CYLINDER HEAD 4256413 - Caterpillar

Side Slope Wear Bushing Seal Exposure Inspection Procedure
Clean the inside of the link box near the bushing on 6 to 10 consecutive joints. Skip any link boxes with dry or extended joints. The link boxes with dry or extended joints cannot be used for this inspection.
Illustration 14 g02148731
(A) Outside left-side track (B) Inside left-side track (C) Inside right-side track (D) Outside right-side track
Illustration 15 g02148729
Correct bushing seal exposure measurement. 1U-7234 Feeler Gauge placed flat on the link surface and measurement taken at the point on the bushing nearest the rail.
Illustration 16 g02148726
Correct bushing seal exposure measurement. 4C-8733 Tapered Gauge placed flat on the link surface and measurement taken at the point on the bushing nearest the rail.
Use a 1U-7234 Feeler Gauge or 4C-8733 Tapered Gauge in order to measure the inboard bushing seal exposure at locations (A) & (C) and/or (B) & (D). Refer to Illustration 15 if using 1U-7234 Feeler Gauge . Refer to Illustration 16 if using 4C-8733 Tapered Gauge .
Inboard bushing seal exposure is defined as the gap between bushing endface and the link face.Note: Machines with normal or minimal side slope wear will not have any gaps between the bushing endface and the link face. The gap will be measurable only on machines with heavy SSW.
The gauge should lay flat on the link surface. The measurement should be taken at the point on the bushing that is closest to the link rail.
Illustration 17 g02148723
Incorrect bushing seal exposure measurement. Joint is dry and extended. Also, feeler gauge not placed flat on the link surface, and the measurement is not taken at the point on the bushing nearest the rail.
Measure six adjacent joints on each track and determine the average bushing seal exposure. Do not measure joints that are extended or dry, as these joints will have abnormal wear. Refer to Illustration 17 for an example of a dry or extruded joint.
Use the following table to determine the appropriate corrective action for Side Slope Wear, if any. Apply the Side Slope Wear corrective actions in Table 4 only if:
Table 3
UC Hours    Average Bushing Seal Exposure    
2000 - 3000     ≥
0.5 mm (0.020 inch)    
3000 - 4000     ≥
1.0 mm (0.039 inch)    
4000 - 6000     ≥
1.5 mm (0.059 inch)    If the combination of hours and bushing seal exposure do not match the criteria above, then the failure is not a result of Side Slope Wear and Side Slope Wear Corrective Actions do not apply. Review the other causes of dry joints listed with in this document.Corrective Actions (for Side Slope Wear)
Illustration 18 g02148721
(1) Former CTI (2) New Relieved Tread Idler (RTI)
Install four Relieved Tread Idlers (RTI). Modified idler thrust flange helps to prevent bushing seal exposure.
Table 4
Side Slope Wear Corrective Action    
   Relieved Tread Idler (RTI)    Reference Literature    
D5M and D5N     LGP     RTI not offered    
D6M and D6N     XL     323-1168     Special Instruction, REHS5304    
LGP
D6R, D6R Series II, D6R Series III, and D6T