858939 Mercury SCREW, (M5 x 35)

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PSP FOR REPLACING THE STUB SHAFT & BEARING AS. IN THE 4N1092 REAR BALANCER GROUP ON CERTAIN 631E, 637E, 657E SCRAPERS; 768C TRA CTORS; 769C TRUCKS; 3408 INDUSTRIAL, MARINE, SPARK-IGNITED, & GENERATOR SET ENGINES - PS4572 - MAILED US, CANADA, CACO, BRAZIL , CFEL, COSA, MARINE TEPS, LIMITED COFA
  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-23 A-16 AU-12.1 B-3 E-19 O-22 TM-6 1220 PS4572 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 "PS4572" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
February 29, 1992
Problem
The surface finish of the stub shaft in the 4N1092 Rear Balancer Group of certain 631E, 637E, and 657E Scrapers; 768C Tractors; 769C Trucks; and 3408 Industrial, Marine, Spark-Ignited, and Generator Set Engines may not be as smooth as specifications require. A surface that is not smooth enough can reduce the service life of the bearing in the gear assembly.
Affected Product
Model Identification Number 631E 05A9833 1AB1385-1403, 1408 637E 1FB512-514 657E 91Z398, 403, 405-407, 420 768C 02X369, 370 769C 01X5436, 5438-5454, 5457-5548, 5553, 5557, 5559, 5562, 5563, 5566 3408 6NB804-818 67U13987-14078, 14080-14085, 14087, 14088, 14090-14093, 14097- 14104, 14107-14109, 14111, 14115, 14117 99U6873-6914, 6916, 6917 78Z3958-4020, 4022-4025, 4027, 4029, 4031-4033, 4035, 4037-4039
Parts Needed
1 - 4N1015 Bearing 1 - 4N1151 Gasket (Oil Pan) 1 - 7N9331 Gasket (Flywheel Housing) 1 - 1W4449 Shaft 1 - 2W1734 Seal (Crankshaft/Rear)
Action Required
Follow the procedures in the Service Manual. Where appropriate, the engine will need to be removed from the vehicle. Remove the flywheel housing and the 4N1092 Rear Balancer Group. Replace the 1W4449 Shaft and the 4N1015 Bearing (part of 4N1018 Gear Assembly).
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. whichever (D/N) (Cost) (C/L) (Sell) comes first **** 768C Tractors and 769C Trucks **** 0-4000