TUBE-AIR 4W1073 - Caterpillar

Caterpillar: Confidential Yellow
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 must be administered as soon as possible. When reporting the repair, use "PI3005" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3005" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Refer to your Warranty Bulletin for detailed information in regards to Product Improvement Programs.
This Revised Service Letter replaces the June 23, 1997 Service Letter. Changes have been made to the Parts Needed and the Owner Notification.
Completion Date
December 31, 1997Termination Date
June 30, 1998Problem
Certain timing advance failures may cause subsequent damage to other components, including pistons. New software is now available that will prevent subsequent damage.
Affected Product
Model & Identification Number
3406C (4CK1-24722)
Parts Needed
1 - 6V1179 Seal-O-RingRefer to the following table for the appropriate software:
Action Required
Inspect the existing software to see if it falls within the horsepower ranges mentioned in the Parts Needed section of this letter and install the new software.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)Copy Of Owner Notification For U.S. And Canadian Owners