PRODUCT SUPPORT PROGRAM FOR REPLACING THE TANDEM DRIVE CHAINS ON CERTAIN 12H, 140H, 143H, 160H, AND 163H MOTOR GRADERS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE TANDEM DRIVE CHAINS ON CERTAIN 12H, 140H, 143H, 160H, AND 163H MOTOR GRADERS

Usage:

SEBE9072-01

February 21, 2005
(Revised May 2006)
U-51
A-38
D-44
O-44

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*After failure* *Parts stock action needed*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE TANDEM DRIVE CHAINS ON CERTAIN 12H, 140H, 143H, 160H, AND 163H MOTOR GRADERS
3261 4063		PS50951

NOTE: 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 " PS50951" as the Part number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

NOTE: Although this Program is to be administered as described above on the Affected Product, parts should be removed from parts stock as soon as possible.

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.

NOTE: This Revised Service Letter replaces the February 21, 2005 Service Letter. Changes have been made to the Termination Date and Affected Product.

TERMINATION DATE

February 28, 2008

PROBLEM

The 6G1633 and 8X2926 Chain Groups used on certain 12H, 140H, 143H, 160H, and 163H Motor Graders may contain pins that did not receive the proper heat treat. Without the proper heat treatment the pins could shear off at low hours. The suspect chain groups have a date code of "F8". Chain groups that do not have a date code of "F8" are not covered under this program.

AFFECTED PRODUCT

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Model	Identification Number
*** Group 1 ***
12H	CBK427-520
12H	4ER950-970
12H	AMZ505-520
12H	12500114-134
140H	CCA697-872
140H	APM1349-1456
140H	5HM2448-2478
140H	12600176-192
143H	APN394-429

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Model	Identification Number
*** Group 2 ***
160H	ASD367-400
163H	ARL307-317

PARTS NEEDED

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Quantity	Part Number	Description
*** Group 1 ***
1	6G1633	CHAIN GP

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Quantity	Part Number	Description
*** Group 2 ***
1	8X2926	CHAIN GP

ACTION REQUIRED

***** Parts Stock *****

Inspect all 6G1633 and 8X2926 Chain Groups in dealer parts stock for an "F8" Date Code. Chain groups with an "F8" Date Code need to be removed from dealer parts stock. Refer to the following Illustration for the location of the date code.

Illustration - Location of date code stamp on the chain links

***** Affected Product *****

***** Group 1 and Group 2 *****

See the attached procedure.

SERVICE CLAIM ALLOWANCES

***** Parts Stock *****

Submit one claim for all 6G1633 and 8X2926 Chain Groups removed from dealer parts stock.

***** Affected Product *****

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
	Parts	Labor Hrs	Parts	Labor Hrs	Parts	Labor Hrs
*** Group 1 and Group 2 ***
0-1000 Hours 1-Up Months	100%	4	0	0	0	0
NOTE: This is a 4-hour job to inspect both tandems and replace one or two chains in the first tandem. An additional 3 hours will be allowed if one or two chains require replacement in the second tandem.

PARTS DISPOSITION

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Attach. (1-Rework Procedure)

REWORK PROCEDURE

Refer to the Disassembly & Assembly Manual for the proper drive chain replacement procedure.

If a failure of one chain is experience, the other three chains on the machine should be inspected and replaced if they have the "F8" date code.

The date code is stamped on one side of the chain links with a letter to the left of the trademark and a number to the right of the trademark. See the following Illustration.

Illustration - Location of date code stamp on the chain links

Typically, every fifth or sixth link in each chain will have the date code stamp. The date codes should be visible through the access openings in the top and/or sides of the tandem housings. The wheels may need to be rotated to move the links containing the date codes to a visible location.