983716 Volvo.Penta Hexagon nut

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PSP FOR INSTALLING A NEW GOVERNOR DRIVE GEAR ON CERTAIN E110B, E120B, E200B,EL200B,213B,214B,224B,E240B,EL240B EXCAVATORS; CB-434 COMPACTORS; 446 BACKHOE LOADERS; CP-563, CS-563 COMPACTORS; AP-1050 PAVERS; 3114, 3116 ENGINES (COMMERCIAL) - PS4449 - MAILED US AND, CANADA, CACO, COFA, 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-76 A-45 AU-48 E-49 O-62 1288 PS4449 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 "PS4449" as Part Number, "7755" as Group Number, and "96" as Description Code. Although this Program is to be administered as described above on the Affected Product, parts should be removed from parts stock as soon as possible. If possible, it is recommended that this Program be implemented on the Affected Product at the same time as the October 30, 1989 Service Letter - PS4359. Termination Date
April 30, 1992
Problem
Governor drive gear on certain E110B, E120B, E200B, EL200B, 213B, 214B, 224B, E240B, and EL240B Excavators; CB434 Compactors; 446 Backhoe Loaders; CP563 and CS563 Compactors; AP1050 Pavers; and 3114 and 3116 Engines (Commercial) may not have the proper profile. An improper profile can result in wear of the camshaft gear.
Affected Product
Model Identification Number E110B 8MF1-139 E120B 6JF1-1-151, 154 E200B 6KF1-348 6KG1-123 EL200B 7DF1-843 213B 1EJ1-228 214B 4CF1-268 9MF1-189 224B 7WF1-46, 49, 56 E240B 9PF1-130 EL240B 6MG1-70 CB434 3TF1-51 446 6XF1-252 CP563 1YJ1-59 CS563 8XF1-49 AP105