BRACKET-ALTERNATOR 7S6723 - Caterpillar

Caterpillar: Confidential Yellow
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 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 "PS4402" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
This Revised Service Letter replaces the March 16, 1998 Service Letter. Changes have been made to the Service Claim Allowances.
Termination Date
March 31, 1999Problem
An incorrect component was installed in the VR3 PM Voltage Regulator and can result in a regulator failure on certain engine generator sets.
Affected Product
Model & Identification Number
3208 (30A7118-7125, 30A7128-7133 5YF3713 , 5YF3715, 5YF3718, 5YF3720, 5YF3726, 5YF3729, 5YF3733)
3306 (85Z14221, 85Z14222, 85Z14229, 85Z14230, 85Z14233, 85Z14234)
3306B (9NR2496)
3406C (1SS233 2WB17834 , 2WB17841, 2WB17846, 2WB17847, 2WB17849, 2WB17851-17857 4EK1676 , 4EK1693, 4EK1701, 4EK1710, 4EK1711, 4EK1730 4ZR3392 , 4ZR3426, 4ZR3427, 4ZR3509, 4ZR3550, 4ZR3559, 4ZR3565-3568, 4ZR3589 , 4ZR3590, 4ZR3604, 4ZR3642)
3412 (2WJ1617-1621, 2WJ1623, 2WJ1624, 2WJ1626-1628, 2WJ1631, 2WJ1632 2WJ1634-1638 , 2WJ1640-1644, 2WJ1647, 2WJ1649, 2WJ1650, 2WJ1652-1655, 2WJ1657 , 2WJ1665, 2WJ1684 81Z22168 , 81Z22169, 81Z22175, 81Z22176, 81Z22180, 81Z22181, 81Z22186, 81Z22193-22195 , 81Z22197-22200, 81Z22203, 81Z22205, 81Z22207, 81Z22208 , 81Z22210, 81Z22216, 81Z22218, 81Z22227, 81Z22229, 81Z22230, 81Z22233 , 81Z22235, 81Z22241-22243, 81Z22246, 81Z22247, 81Z22250, 81Z22255-22258 , 81Z22266-22273, 81Z22278, 81Z22284-22289, 81Z22294 , 81Z22306, 81Z22313, 81Z22315, 81Z22319, 81Z22327)
3412C (9BR582)
3508 (23Z7108, 23Z7111-7114)
3508B (3DM106 6PN406 , 6PN407, 6PN413)
3512 (24Z8444-8446, 24Z8451, 24Z8455, 24Z8473, 24Z8475, 24Z8483-8485, 24Z8494)
3512B (8RM279, 8RM284 6WN175 , 6WN176)
3516 (5SJ617 4XF723 25Z5889 , 25Z5891)
3516B (7RN578)
Loose Shipped Generator Sets6DG01253, 12546AF114347GM6079DR2100, 21029FF2578
1145509/">1145509, 1145510 and 1145511 Regulators shipped between December 1, 1997 and January 16, 1998 with the following identificaiton numbers need to be replaced.
MLNAF1934-1937MLNAF2045-2073MLNAF6895-6910MLNAG7530-7565MLNAG7569-7604MLNAG7807-7914MMNAH2278-2313Parts Needed
Only one of the following parts is needed. For assistance consult TMI to determine regulator part number needed.
1 - 1145509 Regulator Assembly (120V Sensing)1 - 1145510 Regulator Assembly (240V Sensing)1 - 1145511 Regulator Assembly (480V Sensing)Action Required
Parts Stock
Inspect and remove all 1145509/">1145509, 1145510 and 1145511 Regulators with the following identification numbers: The identification number can be located on the part number film of the regulator.
MLNAF1934-1937MLNAF2045-2073MLNAF6895-6910MLNAG7530-7565MLNAG7569-7604MLNAG7807-7914MMNAH2278-2313Affected Product
1. Shut down the genset and take the unit out of service by either turning the battery disconnect switch to the "OFF" position or disconnecting the negative terminal of the battery.2. Remove the appropriate side cover from the generator to gain access to the regulator mounting location.3. Verify that the wiring to the regulator is appropriately labeled before disconnecting the wiring from the regulator, then disconnect the wiring.4. Remove the regulator by loosening the three mounting bolts and nuts.5. Install the new regulator and tighten the mounting bolts.6. Connect the wiring to the regulator.7. Install the side cover back onto the generator and tighten