RING 7G4766 - Caterpillar

Engine: C15 (S/N: C5E1-UP; C5L1-UP)Generator Set: 3406C GEN SET (S/N: C2G1-UP; C5G1-UP; C8G1-UP) 3456 GEN SET (S/N: C1G1-UP; C3G1-UP; C4G1-UP; C2T1-UP) C15 GEN SET (S/N: C5H1-UP) C18 GEN SET (S/N: C6C1-UP; G4C1-UP; STD1-UP; STM1-UP; EKW1-UP) C9 GEN SET (S/N: C9E1-UP)Industrial Engine: C15 IND (S/N: JRE1-UP)Introduction
The ""Problem"" that is identified below does not have a known permanent solution. Until a permanent solution is known, use the ""Solution"" that is identified below.The following items are affected by this Technical Information Bulletin:
289-4769 Voltage Regulator As
242-3958 Voltage Regulator Gp Problem
The Caterpillar R448 Voltage Regulator may fail to operate properly if the following criteria are not met:
The generator and the voltage regulation system is not correctly adjusted.
The generator and the voltage regulation system is not correctly set up.
The generator and the voltage regulation system is not correctly maintained.Additionally, the following issues have been identified:
Some Voltage Regulator failures are reported against the incorrect part number for the Voltage Regulator.
Some reports of failures may be caused by the incorrect setup of the voltage regulator.
If the dealer or the customer has replaced the Voltage Regulator in the field, the regulator may not have been set up correctly for matching the default characteristics of the generator.
The Voltage Regulator may be diagnosed incorrectly as the cause of the fault. The actual cause of the fault could be one of the following items in the following list:
The main stator
The main rotor
The exciter stator
The exciter rotorSolution
Correct Part Number Identification And Replacement
The Voltage Regulator has been redesigned. The 289-4769 Voltage Regulator As replaces the former 242-3958 Voltage Regulator Gp . Use only the 289-4769 Voltage Regulator As for feild repairs.If the former Voltage Regulator 242-3958 Voltage Regulator Gp fails in field, the same part number ( 242-3958 Voltage Regulator Gp ) must be recorded on warranty claims. The new part number for the Voltage Regulator 289-4769 Voltage Regulator As should only be entered on warranty claims if the 289-4769 Voltage Regulator As has actually failed. The new part number for the Voltage Regulator ( 289-4769 Voltage Regulator As ) pertains to the following products:
APS (China) built product
The following Larne (UK) built generators serial numbers: (S/N: L5A00749-UP), (S/N: L6B3402-UP) and (S/N: L7A639-UP).
The following Griffin (USA) built generators serial numbers: (S/N: G7A302-UP), (S/N: G6B1871-UP) and (S/N: G5A575-UP). Identification of the correct part number for the Voltage Regulator for warranty claims can be made visually as follows:
Illustration 1 g01451579
The former 242-3958 Voltage Regulator Gp has bare link wires (1) protruding from the black potting resin. Refer to Illustration 1.
Illustration 2 g01451577
The new 289-4769 Voltage Regulator As has links (2) that are covered with white PVC protruding from the potting resin. Refer to Illustration 2.Setup Of The Voltage Regulator
Refer to the ""Reference"" Section for a list of manuals that contain the following information:
Setup procedures for the Voltage Regulator
Jumper information for the Voltage Regulator
Adjusting potentiometer identification
Set up information
Additional informationNone of the incorrectly set up jumpers should cause the