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 must be administered as soon as possible. When reporting the repair, use "PI3572" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3572" as the Part Number, "7751" as the Group Number, "" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Completion DateAugust 31, 1992
Termination DateFebruary 28, 1993
The main frame needs to be inspected for cracks and reworked if necessary on certain D6E Tractors.
Model & Identification Number
See the attached procedure.
U.S. and Canadian owners will receive the attached owner Notification.
Service Claim Allowances
NOTE: This is a 10-hour job.
NOTE: U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
- (1-Owner Notification)
- (2-Rework Procedure)
Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure for 8P4176 Case & Frame Assembly
1. Visually inspect the lower part of the frame rails, cl.ose to the equalizer bar support welded on the rails, in order to identify the presence of cracks as well as the existence or not of the weld pigtails beyond the supports (4 places of each one). See Illustration 1.
2. If no crack is detected, verify that the 8 pigtails are without sharp corners and grind according to Detail A on Illustration 2. If the pigtails are not without sharp corners, proceed the elimination of sharp corners as described in procedure 1.
NOTE: There can not be any weld on the supports ends except for the pigtails.
3. If a crack(s) are found, verify its condition and follow the Procedure 1 or Procedure 2.
Procedure 1 is for cases in which it is necessary to rework the pigtails and also if th.ey show cracks.
Procedure 2 is for cases in which there are cracks on sections and/or side plates and being the extension of the cracks on side plate, up to 50 mm. See Illustration 4 Part 1 of 4.
Procedure 1 - Follow this procedure when the pigtails are cracked or have sharp corners see Illustration 3
- Arc Welding process
- Electrode AWS E7018
- Size 3.2 mm - 140 Amp. (first pass)
- Size 4.0 mm - 220 Amp.
- Polarity DC+
- Electrode AWS E7018
...All foreign material such as paint, grease, and others must be removed.
...The cooling must be done in normal air condition.
...Remove pigtails and 25 mm of weld between support and rail.
...Remake the weld between support and rail plus the pigtail so it will be one single bead, without tie-in. Grind the pigtail to form the radii.
Procedure 2 - Follow this procedure when section and/or side plates show cracks and the cracks do not exceed 50 mm in length, at side plates. See Illustration 4.
NOTE: In a case where the crack length exceeds 50 mm, contact Caterpillar for specific actions.
...Same as Procedure 1
...Cleaning and cooling same as Procedure 1
...Provide material for back-up:
- Material - SAE 102
- Thickness: 4.0 mm
- Width: 30.0 mm
- Thickness: 4.0 mm
1. Using carbon electrode, remove cracks on section making a bevel groove and cracks on side plate, making a "V" groove.
2. Remove slags from the joint.
3. Cut away a back-up plate, 70 mm length and weld an electrode on it. See Illustration 4 - Part 2 of 4.
4. Put the back-up at the section and tack weld. See Illustration 4 - Part 3 of 4.
5. Follow procedure 3 and 4 above for the side plates.
6. Weld the section and side plate according welding conditions.
7. Grind weld flat.
NOTE: The weld on the section can never be concave or convex.
8. Remove pigtails (8) and 25mm of supports/rails weld. See Illustration 4 - Part 4 of 4.
9. Remake the weld, without tie-in. Grind it. See Illustration 4 - Part 4 of 4.
Illustration 1 - Part 1 of 2- Case & Frame Group Rail
Illustration 1 - Part 2 of 2 - Case & Frame Group Rail
Illustration 3 - Detail Of The Lower Support Weld
Illustration 4 - Part 1 of 4
Illustration 4 - Part 2 of 4
Illustration 4 - Part 3 of 4
Illustration 4 - Part 4 of 4 Detail Of Bead Weld On The Lower Part