PAN GP-OIL 2744691 - Caterpillar

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.
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 "PS8457" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
This Revised Service Letter replaces the September 24, 1995 Service Letter. Changes have been made to the TERMINATION DATE.
Termination Date
July 31, 1997Problem
The R-Boom must be reworked to provide increased durability and service life of booms used on certain 350 Excavators. The welds in the boom nose area must be reworked to ensure adequate weld penetration. It has also been determined that thicker side plates are required in the boom foot area.
Affected Product
Model & Identification Number
350 (9FL95, 9FL96, 9FL99-104, 9FL106, 9FL109, 9FL112, 9FL120-122, 9FL125, 9FL128, 9FL131, 9FL132, 9FL135 , 9FL138-141, 9FL144, 9FL146, 9FL148-150, 9FL154, 9FL159, 9FL160, 9FL163, 9FL166, 9FL168, 9FL172 , 9FL176-180, 9FL184, 9FL186-188, 9FL191-193, 9FL195-197, 9FL199, 9FL206, 9FL210, 9FL213-215 , 9FL219, 9FL222-225, 9FL235, 9FL236, 9FL238, 9FL240, 9FL244, 9FL245, 9FL250, 9FL257, 9FL259 , 9FL261-264, 9FL272-274, 9FL277, 9FL279-282, 9FL284, 9FL286, 9FL289, 9FL294, 9FL300, 9FL304 , 9FL310, 9FL243, 9FL252)
Parts Needed
2 - 1297105 Plate - ReinforcementAction Required
See the attached rework procedure.
Service Claim Allowances
This is a 32-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach. (1-Rework Procedure)Rework Procedure
BOOM NOSE
1. Grind or gouge to remove all the weld in "Y" area, four location. See Illustration 1.2. Grind both areas carefully to make a vee groove to allow better access of the welding gun to the weld root.3. Carefully clean all of the affected areas to avoid spatters, paint, grease, etc.4. If there was a crack, make a spot check to be sure the crack has disappeared.5. Weld, as shown in Illustration 1, using small passes. Use basic cored weld wire:15.00 OK TUBROD ESADE70T5 AWS A5.201.2 mm diameter
6. After welding, heat the affected areas to 200 degrees C. Cool at a very slow rate by covering the welded area with an insulation blanket.7. Grind all areas carefully to avoid overlap and undercuts.8. Grind the transverse area flush and smooth to avoid stress risers (from top plate to bottom plate) and to get a smooth radius with the weld in "X" areas on both sides. See Illustration 1.9. Paint the repaired areas.BOOM FOOT
1. Remove the boom from the machine.2. Grind the transverse area flush and smooth to avoid stress risers (from top plate to bottom plate) and to get a smooth radius with the weld in "X" areas on both sides. See Illustration 2.3. Remove paint, grease, etc. on both