PRODUCT SUPPORT PROGRAM FOR REWORKING THE WELD AROUND THE DOZER BLADE BRACKET ON CERTAIN D6N XL AND LGP TRACK-TYPE TRACTORS EQUIPPED WITH A VPAT DOZER Caterpillar

PRODUCT SUPPORT PROGRAM FOR REWORKING THE WELD AROUND THE DOZER BLADE BRACKET ON CERTAIN D6N XL AND LGP TRACK-TYPE TRACTORS EQUIPPED WITH A VPAT DOZER

Usage:

REBE2902-00

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13Nov2007

U-580

A-471

D-473

O-506

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*After Failure Only*	PRODUCT SUPPORT PROGRAM FOR REWORKING THE WELD AROUND THE DOZER BLADE BRACKET ON CERTAIN D6N XL AND LGP TRACK-TYPE TRACTORS EQUIPPED WITH A VPAT DOZER
6052		PS51389

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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 "PS51389" 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.

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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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TERMINATION DATE

30Nov2009

PROBLEM

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The existing welds between the blade and the bracket can crack on certain D6N XL and LGP Track-Type Tractors. If the existing weld cracks, the blade can be reworked by arc-air gouging the weld and making a new one.

AFFECTED PRODUCT

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Model	Identification Number
*****Group 1*****
D6N LGP	ALR00001, 207-427, 635-800 ALY00256-01172, 1335-3251 CCG00207-00261, 400-447, 449-450 CCS00256-00266, 400-423
D6N XL	AKM00312-01049, 1235-2529 ALH00188-00551, 735-897 CBF00188-00226, 300-356 CBJ00188-00310, 400-520 CBL00312-00317, 400-434 CCK00312-00376, 500-955

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*****Group 2*****
D6N LGP	DJY00121-00678
D6N XL	DJA00231-00449

PARTS NEEDED

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No parts needed for this program

ACTION REQUIRED

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Refer to the attached Rework Procedure.

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Image1

SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
*****Group 1*****
0-1000 hrs, 0-12 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
1001-2000 hrs, 13-24 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

NOTE: This is a 5.0-hour job for Group 1

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
*****Group 2*****
0-1000 hrs, 0-12 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
1001-2000 hrs, 13-24 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

NOTE: This is a 5.0-hour job for Group 2

PARTS DISPOSITION

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

Rework Procedure

This repair can be performed without disassembling the blade from the tractor if the welder has the ability to weld in position and if the accessibity of the rework is okay.

1) After identifying all the cracks, remove all the cracked welds by air-arc gouging until the root of the welds (use carbon electrode diameter 8mm (0.315") or 10mm (0.394"). Grind the area of the welds up to the base metal in order to remove all of the carbon deposits and make the surface smooth. If it is difficult to remove the gap (1.5mm maxi) perform a 10 X 10 mm V groove between the bracket and the blade. Refer to Image 1.1.2.

Image1.1.1

Image1.1.2

2) Before performing the new welds, clamp the bracket against the blade by using clamping devices that could be tacked on the blade, or block rigidly the blade and activate the angle cylinder to tighten the bracket against the blade. The gap between the bracket and the blade must be as minimum as possible. Refer to Image 1.2.1.

Image1.2.1

3) Weld the bracket on the blade by first filling the V groove and then perform a fillet weld so the 3/4 of the bracket thickness is covered by the weld. Refer to Images 1.3.1, 1.3.2, and 1.3.3. Make several passes if needed. The following welding processes are prefered for this repair: Gas Metal Arc Welding (GMAW) with solid wire diameter 1.2mm (0.047") (EN440 G3Si or G4Si1) and Shielded Metal Arc Welding (SMAW) with electrode diameter 3.2mm (0.126") to 4mm (0.158") (E51 5/4 B120). If needed, perform the same operation on the opposite side.