PSP FOR REPLACING THE 7W1454 OR 7W1455 ACTUATOR ASSEMBLIES AND 9Y4603 THROTTLE ASSEMBLY ON CERTAIN 3408 SI AND 3412 SI GEN ERATOR SET ENGINES - PS4526 - MAILED US AND CANADA, CFEL, COSA, LIMITED COFA - REVISED 11/90 Caterpillar

(Revised November 1990)
U-196
A-136
AU-123.2
E-118
O-152
1903   PS4526
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 "PS4526"
as Part Number, "7755" as Group Number, and "96" as Description
Code.
NOTE: This Revised Service Letter replaces the September 20, 1990
Service Letter. Changes have been made to better describe the
Affected Product.

September 30, 1991

Actuator arm movement can cause linkage and throttle bearing wear to be
higher than desired on certain 3408 SI and 3412 SI Generator Set Engines; and
on certain 3408 SI and 3412 SI Industrial Engines. A 7E8556 Actuator
Assembly and 4P2008 Throttle Assembly can be installed to improve their
service life.

Model Identification Number
3408 SI 6NB1-759
3412 SI 7DB1-525
NOTE: The identification numbers listed above include both Generator
Set Engines and Industrial Engines.

1 - 7E8556 Actuator Assembly
1 - 4P2008 Throttle Assembly

Follow the procedures in the Service Manual to remove the existing 7W1454 or
7W1455 Actuator Assemblies and 9Y4603 Throttle Assembly; and to install the
new 7E8556 Actuator Assembly and 4P2008 Throttle Assembly. Make all
necessary checks and adjustments before returning the generator set to
service.

Product Caterpillar Dealer Suggested Customer Suggested
smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
whichever   (C/L) (Sell)
comes
first
0-10000 100% 1 0 0 0 0
0-48 mo
NOTE: This is a 1-hour job.

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.