134200-2920 ZEXEL 9 411 615 726 BOSCH TAPPET 9411615726 1342002920 1156121260

Caterpillar: Confidential Yellow
PSP FOR INSTALLING NEW FUEL INJECTION LINE BRACKETS AND CLAMPS ON CERTAIN D8L TRACTORS, D9N TRACTORS, 589 PIPELAYERS, 631E SCR APERS, 637E SCRAPERS, 657E SCRAPERS, 768C TRACTORS, 769C TRUCKS, 834B TRACTORS, AND 988B LOADERS - PS4428 - MAILED US AND CA NADA, CACO, COFA, BRAZIL, CFEL, COSA
  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.
U-63 A-35 AU-38 B-13 E-39 O-54 1252 PS4428 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4428" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
March 31, 1991
Problem
The fuel lines on certain D8L Tractors, D9N Tractors, 589 Pipelayers, 631E Scrapers, 637E Scrapers, 657E Scrapers, 768C Tractors, 769C Trucks, 834B Tractors, and 988B Loaders may fail. New brackets and clamps can be installed to increase the service life of the fuel injection lines.
Affected Product
Model Identification Number D8L 7YB962 7JC778 D9N 1JD1288, 1295, 1296, 1298-1356, 1358, 1361-2039, 2045, 2048, 2049, 2052 589 31Z423-452 631E 1AB965-1198, 1209 637E 1FB361-416, 418, 422 1JB612-724 657E