PRIORITY - THE CASE AND FRAME ASSEMBLY NEEDS TO BE INSPECTED FOR TOOL MARKS FROM MACHINING OPERATIONS ON CERTAIN D5B TRA CTORS - PI3520 - MAILED US AND CANADA, BRAZIL - PLEASE NOTE THAT A LIMITED MAILING WAS MADE TO COSA FOR A SUPPLEMENT TO THIS S L Caterpillar

PRIORITY - THE CASE AND FRAME ASSEMBLY NEEDS TO BE INSPECTED FOR TOOL MARKS FROM MACHINING OPERATIONS ON CERTAIN D5B TRA CTORS - PI3520 - MAILED US AND CANADA, BRAZIL - PLEASE NOTE THAT A LIMITED MAILING WAS MADE TO COSA FOR A SUPPLEMENT TO THIS S L

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PRIORITY - THE CASE AND FRAME ASSEMBLY NEEDS TO BE INSPECTED FOR TOOL MARKS FROM MACHINING OPERATIONS ON CERTAIN D5B TRA CTORS - PI3520 - MAILED US AND CANADA, BRAZIL - PLEASE NOTE THAT A LIMITED MAILING WAS MADE TO COSA FOR A SUPPLEMENT TO THIS S L

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.


A-39
B-11
PRIORITY
7050  PI3520
COMPLETION DATE

Termination Date

September 30, 1991  March 31, 1992

Problem

The case and frame assembly on certain D5B Tractors need to be inspected for
tool marks that could cause stress concentrations and lead to cracking. If
tool marks exist, rework is required.

Affected Product

Model Identification Number
D5B  5LD1-411
8HD1-588

Parts Needed

Fabricated - Use if required

Action Required

See the attached procedure.

Owner Notification

Not Applicable

Service Claim Allowances

Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(D/N) (Sell)   (C/L) (Sell)
100% 1 0 0  0 0
NOTE: This is a 1-hour job to inspect the case and frame for tool
marks. If tool marks from machining exist, up to a maximum of 31
additional hours will be allowed for fabricating parts to
complete the necessary repairs.

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-Rework Procedure)
Rework Procedure
1. Inspect the external side of the 5S3249 Frame Assembly (RH) and the
5S3250 Frame Assembly (LH) near the end of the 2Y9873 Radiator Guard
Group. See Illustration 1.
2. If machining marks that cause sharp corners on the upper or lower
sections and/or on the side plates exist, refer to the following:
A) Marks on the side plates up to 1.5 mm in depth should be ground off
to remove sharp corners.
B) Grind, scarf, or cut the upper and lower sections to remove the
corners so that they have a minimum radii of 50 mm.
C) Marks on the side plates of 1.5 mm or more in depth require both
Steps A) and B) above plus reinforcement plates need to be
fabricated and welded inside booth of the frame assemblies as shown
in Illustration 2. Refer to the following Installation and Welding
Instructions.
Installation and Welding Instructions
1. Remove oil, grease, paint, rust, etc. from the areas to be welded.
2. Use AWS E7018 Electrodes with the voltage and amperage indicated by the
supplier.
3. Make a reinforcement for each of the frame assemblies as shown in
Illustration 2.
4. Position and tack weld the reinforcement in place as shown in the
illustration.
5. Weld the reinforcement to the frame. Make 6 mm fillet welds from "A" to
"B" and from "C" to "D". Do not weld the ends from "A" to "D" or from
"B" to "C".
6. Remove all slag.
7. Paint the reinforcement and affected areas.
****** IMAGE: SEBE4542.00001.001
CAPTION: Illustration 1
****** IMAGE: SEBE4542.00001.002
CAPTION: Illustration 2