Product Support Program For Repairing The Rear Track Roller Frame On Certain D9N And D9R Tractors Caterpillar

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 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 "PS5275" 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: This Revised Service Letter replaces the August 3, 1997 (Revised February 1998) Service Letter. Changes have been made to the Service Claim Allowances.

Termination Date

Problem

The rear track roller frame can fail at low hours on certain D9N and D9R Tractors. The failure mode is a crack and subsequent failure at the pivot shaft casting weld to the rear tube. It also cracks at the e-bar casting to tube weld.

Affected Product
Model & Identification Number

D9N (5FJ1-Up 6XJ1-Up )

D9R (7TL1-849 8BL1-1050 )

Parts Needed

1 - 1356136 Plate - RH

4 - 1356137 Plate

2 - 1356138 Plate - RH

2 - 1356139 Plate - LH

1 - 1397717 Plate - LH

4 - 1397718 Plate

Action Required

1. At first bushing turn check for visible cracks.

a. If crack is visible repair per Special Instruction SEHS 9998-01 and Video TEVN4113 (European Format TEVP4113) which both explain how to repair the cracks and reinforce with plates.

b. If no crack is seen, air arc 3" of weld on top of pivot shaft to tube weld. Pencil grind to smooth the weld surface and use dye penetrant to check for cracks. If dye penetrant shows a crack repair it using Special Instruction SEHS9998-01 and Video TEVN4113 (European Format TEVP4113) to repair and add plates.

c. If no crack is seen on the dye pentrant clean up the weld and weld it up per our Video tape.

2. If the crack goes underneath the skirt cut a window the full width of the skirt and 6" high. Then air arc the weld until the crack is gone(using dye penetrant). Then weld it up.This is a 3 hour operation per window.

3. If the crack does not stop but continues to the belly plate, the skirts and the belly plate have to be removed. Before you air arc underneath, weld up the top section to hold it together. This operation adds 16 hours to the repair work.

Service Claim Allowances

Parts Disposition

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