PSP FOR INSTALLING A NEW 9Y8400 VOLTAGE REGULATOR ON CERTAIN 3208, 3304, 3306, 3406, 3408, 3412, 3508, 3512, AND 3516 GEN ERATOR SET ENGINES EQUIPPED WITH A SR4 GENERATOR - PS4508 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA Caterpillar

PSP FOR INSTALLING A NEW 9Y8400 VOLTAGE REGULATOR ON CERTAIN 3208, 3304, 3306, 3406, 3408, 3412, 3508, 3512, AND 3516 GEN ERATOR SET ENGINES EQUIPPED WITH A SR4 GENERATOR - PS4508 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA

Usage:

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Caterpillar: Confidential Yellow

PSP FOR INSTALLING A NEW 9Y8400 VOLTAGE REGULATOR ON CERTAIN 3208, 3304, 3306, 3406, 3408, 3412, 3508, 3512, AND 3516 GEN ERATOR SET ENGINES EQUIPPED WITH A SR4 GENERATOR - PS4508 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA

NOTE: 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-150
A-101
AU-96
E-93
O-116
4467   PS4508
NOTE: 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 "PS4508"
as Part Number, "7755" as Group Number, and "96" as Description
Code.

Termination Date

July 31, 1991

Problem

The 9Y8400 Voltage Regulator (VR3 Type) on certain 3208, 3304, 3306, 3406,
3408, 3412, 3508, 3512, and 3516 Generator Set Engines equipped with a SR4
Generator may have internal interference between a capacitor and a reactor.
This interference may cause the voltage regulator to fail. The 9Y8400
Voltage Regulators that may have this interference have identification
numbers between 118100 and 119687 on their identification plate.

Affected Product

Model Identification Number
3208* 29A1-Up
30A1-Up
5YF1-Up
3304B* 83Z1-Up
3306* 2AJ1-Up
07Y1-Up
85Z1-Up
3406B* 2WB1-Up
4FD1-Up
4RG1-Up
3408B* 6NB1-Up
78Z1-Up
3412* 7DB1-Up
8YF1-Up
81Z1-Up
3508* 1ZF1-Up
2JF1-Up
23Z1-Up
70Z1-Up
3512* 4KC1-Up
3YF1-Up
24Z1-Up
67Z1-Up
3516* 3RC1-Up
4XF1-Up
25Z1-Up
73Z1-Up
* If equipped with a SR4 Generator and a build date between December 12,
1989 and February 21, 1990.

Parts Needed

1 - 9Y8400 Voltage Regulator

Action Required

***** Parts Stock *****
Remove all 9Y8400 Voltage Regulators from parts stock that have
identification numbers between 118100 and 119687 and are not marked with a
green dot next to the serial no. plate.
***** Affected Product *****
Follow the procedures in the Service Manual. Remove the existing 9Y8400
Voltage Regulator from the generator if it has an identification number
between 118100 and 119687. Install a new 9Y8400 Voltage Regulator that has
identification numbers that do not fall into the above range. Test run the
engine/generator to verify that the new voltage regulator functions
correctly. Voltage regulators that have previously been reworked will have a
.25 inch diameter green dot located below the serial number tag on the
regulator body.

Service Claim Allowances

***** Parts Stock *****
Submit one clain for all 9Y8400 Voltage Regulators removed from parts stock.
***** Affected Product *****
Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(C/L) (Sell)
0-5000 100% 1 0 0 0 0
NOTE: This is a 1-hour job.

Parts Disposition

***** U.S. Dealers *****
Return all 9Y8400 Voltage Regulators that are removed from parts stock and a
copy of the claim to:
Caterpillar Inc.
Attn: Supplier Recovery Supervisor
Warehouse #4 Docks 7 thru 10
8201 N. University
Peoria, IL 61615
***** All Other Dealers *****
Any parts removed (with the exception of cores used for Caterpillar
Remanufactured parts) can be rendered useless and scrapped immediately upon
completion of the repair.