PRECHAMBER KT 20R6628 - Caterpillar

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.
This Program must be administered as soon as possible. When reporting the repair, use "PI3588" 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 "PI3588" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
This Revised Service Letter replaces the June 4, 1992 Service Letter. A change was made to correct the Termination Date.
Completion Date
December 31, 1992Termination Date
June 30, 1993Problem
New rear mounts for the hood need to be installed on certain D5C Tractors. The new mounts and associated parts will better secure the hood, and other portions of the engine enclosure.
Affected Product
Model & Identification Number
D5C (6PJ1-180, 6PJ182-291; 3MK1-213)
Parts Needed
Dealers will need to order parts for this Program.
4 - 5G2878 Washer4 - 3H2137 Lug6 - 4L6454 Bolt8 - 6V2370 Rivet6 - 7X7729 Washer4 - 8Y5113 Spring1 - 8Y7876 Support Assembly (Right Hand)1 - 8Y7878 Support Assembly (Left Hand) Action Required
See the attached procedure.
Owner Notification
Not Applicable.
Service Claim Allowances
This is a 6-hour job.
U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.
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
Part 1. - Fabricate Parts
A. Make two gussets from standard low carbon steel. (See Illustration 1)B. Make four of "Plate A" from standard low carbon steel. (See Illustration 2)C. Make four of "Plate B" from standard low carbon steel. (See Illustration 3) Make sure the edges of all the fabricated parts are smooth and free from burrs.
Part 2. - Modification To Engine Side Panel
A. Remove both side engine side panels.B. Locate and drill 4 - 6.4 mm rivet holes in each panel. Clean all chips and burrs from the holes. (See Illustration 4)C. Plug the three existing slots in each panel with weld. Use a backup plate for plugging weld. Grind the weld smooth to blend into surrounding material. (See Illustration 4)D. Secure "Plate A" and the 8Y5113 Spring on each panel with two 6V2370 Rivets. (Two pieces on each panel.)E. Paint the welded and modified area on each panel.Part 3. - Modification To Hood
A. Remove the exhaust pipe and precleaner.B. Remove the four bolts and washers that hold air cleaner housing to hood.C. Remove the five bolts and washers that hold hood to radiator guard. Remove the three bolts and grommets that hold hood to firewall.D. Disconnect the electrical wire from horn.E. Using two people, remove the hood. (the hood weighs approx. 40kg)F. Cut off the rib plate welded on the rear of the hood using dimensions shown in Illustration 6. Weld both