PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND REWORKING CERTAIN TRANSMISSIONS (797F) AND TRANSMISSION COMPONENTS IN DEALER PARTS STOCK Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND REWORKING CERTAIN TRANSMISSIONS (797F) AND TRANSMISSION COMPONENTS IN DEALER PARTS STOCK

Usage:

TEBE8670-01

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28Jan2019

(Revised 15Feb2019)

U-32

A-27

D-29

O-27

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Parts stock action only	PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING AND REWORKING CERTAIN TRANSMISSIONS (797F) AND TRANSMISSION COMPONENTS IN DEALER PARTS STOCK
3030 7750		PI70736

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NOTE:	Caterpillar’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to Caterpillar.
NOTE:	When submitting claim for Parts Stock Action, Use the appropriate 99Z as the s/n, the appropriate Service Letter Program Number as the Part number in the Part Causing Failure field, "7751" as the Group Number, "56" as the Description Code.

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NOTE:

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.

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NOTE:	This Revised Service Letter replaces the 28Jan2019 Service Letter. Changes have been made to the Parts Disposition.

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TERMINATION DATE

30Apr2019

PROBLEM

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Certain 140-7091 Carriers (Train 4), 302-2638 Carriers (Train 5) and 140-7121 Output Shafts may have been improperly manufactured and not correctly balanced. Improperly balanced components may result in unsatisfactory service life. The carriers and output shafts have been installed in 450-3837, 446-9392 or 20R-3632 Transmission Arrangements, which are used in 797F Off-Highway Trucks.

ACTION REQUIRED

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Inspect all 140-7091 Carriers, 302-2638 Carriers, and 140-7121 Output Shafts in dealer parts stock inventory. Refer to the instructions in the rework procedure to inspect the carriers and output shafts. Remove all of these carriers and output shafts from parts stock inventory that do not meet the inspection criteria.

Inspect all 446-9392, 450-3837, and 20R-3632 Transmissions in dealer parts stock/dealer exchange inventory that have the serial numbers shown in the chart below. The carriers and output shafts in the transmissions need to be inspected as indicated with a "Yes" in the chart. Not all inspected parts will require replacement. Replace the parts only if they do not pass the inspection. Refer to the attached rework procedure to inspect the transmissions.

This parts stock service letter is for the inspection of suspect transmissions that have not been installed in a machine.

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Image1

SERVICE CLAIM ALLOWANCES

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Submit one claim for all 140-7091 Carriers, 302-2638 Carriers, and 140-7121 Output Shafts removed from dealer parts stock inventory. Submit one claim for each 446-9392, 450-3837, and/or 20R-3632 Transmission that is inspected/reworked in dealer parts stock/dealer exchange inventory. Include the serial number of the transmission in the claim. 50 hours of labor will be allowed for each transmission that is disassembled, reworked, and bench tested. The parts indicated with a "Yes" in the chart are allowed when necessary. (Use these parts only if/as required as not all transmission arrangements will have suspect parts.)

PARTS DISPOSITION

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NACD:

Hold all (140-7091 Carriers, 302-2638 Carriers and 140-7121 Output Shafts) for a Parts Return Request (PRR). A Parts Return Request (PRR) will be issued to you through the Send-It-Back process after the claim is submitted. Make sure to list the service letter program number on the packing slip and include the closed work order paperwork. Handle all other parts in accordance with your Warranty Bulletin on warranty parts handling.

EAME, LACD, and APD:

Hold all 140-7091 Carriers, 302-2638 Carriers and 140-7121 Output Shafts for 30 days for a possible Parts Return Request (PRR). Make sure to list the service letter program number on the packing slip and include the closed work order paperwork. Handle all other parts in accordance with your Warranty Bulletin on warranty parts handling.

If a Parts Return Request (PRR) is not issued to you after 30 days through the Send-It-Back process, handle the parts in accordance with your warranty bulletin on warranty parts handling.

Rework Procedure

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Refer to the Service Manual (Disassembly and Assembly) if/as required. The transmission output planetary needs to be disassembled to inspect the train 4 carrier (140-7091), the train 5 carrier (302-2638) and the transmission output shaft (140-7121). Refer to the inspection procedure that follows to identify a carrier or output shaft that is incorrectly balanced.

140-7091 Carrier, 302-2638 Carrier and 140-7121 Output Shaft Inspection Procedure

If the carriers or output shafts have balance drill holes they are not suspect and can be used as normal. If no balance drill holes are found, the part is to be replaced with the same part numbered components.

The suspect 140-7091 Carrier supplier will have a 6 digit lot code in the position shown in image 1.2.1. This lot code will be with the part number on the output end face of the 140-7091 Train 4 Carrier. If the carrier is suspect for balance issues, there will be no balance drill holes on the input or output face of the carrier (as shown in image 1.2.2). Image 1.2.3 shows a correctly balanced carrier.

Image1.2.1

Image1.2.2

Image1.2.3

The suspect 302-2638 Carrier supplier will have a 6 digit lot code in the position shown in image 1.3.1. This lot code will be with the part number on the input end face of the 302-2638 Train 5 Carrier. If the carrier is suspect for balance issues, there will be no balance drill holes on the input or output face of the carrier (as shown in image 1.3.2). A correctly balanced 302-2638 Carrier is shown in image 1.3.3.

Image1.3.1

Image1.3.2

Image1.3.3

The suspect 140-7121 Output Shaft supplier will have a 6 digit lot code in the position shown in image 1.4.1. If the output shaft is suspect for balance issues, there will be no balance drill holes on the output face of the output shaft (as shown in image 1.4.2).