SUPPORT 2G4702 - Caterpillar

Caterpillar: Confidential Yellow
AFTER FAILURE ONLY - PSP FOR REPLACING THE TRACK ADJUSTER GROUP ON CERTAIN 320 EXCAVATORS - COSA LETTER NO. 2 - PS0815 - MAI LED COSA
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
HEBE1428 January 31, 1995 COSA LETTER No. 2 ***************** PRODUCT SUPPORT PROGRAM FOR REPLACING THE * after failure * TRACK ADJUSTER GROUP ON CERTAIN 320 * only * EXCAVATORS ***************** 4157 PS0815 This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0815" as the Part Number, "7755" as the Group Number, and "96" as the Warranty Claim Description Code. Termination Date
January 31, 1996
Problem
In some applications, the track adjuster of certain 320 Excavators may seize, resulting in the impossibility to adjust the track tension.
Affected Product
Model Identification Number 320 4ZJ1-620 320L 3XK1-2167 320N 9WG1-1191
Parts Needed
1 - 7Y1780 Cylinder 1 - 7Y1687 Piston 1 - 964276 Ring 1 - 951701 Seal 2 - 951612 Seal 2 - 931515 Ring 2 - 964275 Ring 1 - 931435 Seal
Action Required
Replace the seized piston and cylinder with new ones. Change the related seals. During the reassembly of the adjuster, thoroughly grease the piston outside diameter, the cylinder inside diameter, and the seal grooves (see Illustration attached). To avoid air in the bottom of the cylinder or in the piston fill-relief hole (see Illustration - Notes D and E), fill the cylinder with grease, so that the grease comes out through the fill-relief piston hole during assembly.
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. whichever (D/N) (Cost) (C/L) (Sell) comes first 0-3000 100 % 7 0 0 0 0 0-24