ROD AS-CONNECTING 2255454 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR FRONT GEAR TRAIN WEAR ON CERTAIN 3508 ENGINES (50 HZ PRIME POWER GENERATOR SET) - PS4279 - MAILED US AND CANADA, CAC O, COFA, CFEL, 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.
U-27 A-18 AU-19 E-15 O-19 1205, 1206, 1313 PS4279 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4279" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
February 28, 1990
Problem
Front gear train wear may be a problem on certain 3508 Engines (50 Hz Prime Power Generator Sets only). Installing a larger torsional vibration damper will reduce the torsional vibration and wear.
Affected Product
Model Identification Number 3508 23Z1 - 2128 This Program does not include 3508 Engines sold into standby generator set applications.
Parts Needed
Before Failure 6 - 8S4757 Bolt 1 - 7C9639 Damper Group 1 - 1N3482 Adapter 1 - 5H6734 Seal - O Ring 1 - 6V6809 Seal - O Ring 1 - 6V5066 Seal - O Ring 1 - 1S5772 Gasket After Failure Rework A - Replace Idler Gear & Oil Pump Gear All Parts Listed For "Before Failure" Plus The Following 1 - 7N5241 Gear Assembly - Idler 1 - 7N5250 Gear Assembly - Oil Pump Drive 1 - 7N5243 Bearing - Idler 2 - 8M5255 Seal - Idler Shaft & Water Pump Drive 2 - 7N5244 Bearing - Oil Pump / Water Pump Drive 1 - 1T0132 Seal - Oil Pump Drive Adapter