PSP FOR INSTALLING A THROTTLE BODY THRUST WASHER ON CERTAIN 3408 AND 3412 SI INDUSTRIAL ENGINES TO INCREASE THE SERVICE LIF E OF THE THROTTLE ASSEMBLY - PS4507 - MAILED US AND CANADA, COFA, CFEL, COSA Caterpillar

PSP FOR INSTALLING A THROTTLE BODY THRUST WASHER ON CERTAIN 3408 AND 3412 SI INDUSTRIAL ENGINES TO INCREASE THE SERVICE LIF E OF THE THROTTLE ASSEMBLY - PS4507 - MAILED US AND CANADA, COFA, CFEL, COSA

Usage:

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Caterpillar: Confidential Yellow

PSP FOR INSTALLING A THROTTLE BODY THRUST WASHER ON CERTAIN 3408 AND 3412 SI INDUSTRIAL ENGINES TO INCREASE THE SERVICE LIF E OF THE THROTTLE ASSEMBLY - PS4507 - MAILED US AND CANADA, 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-152
A-103
AU-98
E-94
O-118
1250   PS4507
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 "PS4507"
as Part Number, "7755" as Group Number, and "96" as Description
Code.

Termination Date

July 31, 1991

Problem

The service life of the 9Y5308 Throttle Assembly can be increased on certain
3408 and 3412 SI Industrial Engines by installing a throttle body thrust
washer.

Affected Product

Model Identification Number
3408* 6NB1-763
3412* 7DB1-527
* Industrial Engines with PSG type governor only.

Parts Needed

1 - 4P2024 Washer
1 - 4P2026 Stop Collar
1 - 6L5296 Screw

Action Required

1. Remove 6L5296 Screw, 8L4470 Lever Assembly and 7W1163 Washer on 9Y4603
Throttle Assembly. See the illustration.
2. Install the 4P2024 Washer on the shaft so that tab on washer fits in
slot on throttle assembly.
3. Close the throttle plate.
4. Place 4P2026 Collar on shaft and line up one of the holes in collar with
hole in shaft such that holes are concentric with each other as shown in
the illustration.
5. Install the 6L5296 Screw in the 4P2026 Collar (finger tight).
6. Open throttle plate approximately 30 degrees and tighten the 6L5296
Screw.
7. Orient throttle assembly so that shaft is vertical, then open and close
throttle plate. Assembly is OK if throttle plate moves freely and
"snaps" when closed. If throttle plate feels stiff and/or does not
"snap" closed, the 4P2026 Collar will need to be repositioned. First
check where the throttle plate is rubbing either closest to tabbed
washer or farthest from tabbed washer. Proceed to Step 8.
8. With throttle plate closed, remove 6L5296 Screw and align shaft hole
with:
a) next lower collar hole if throttle plate rubs closest to washer.
Proceed to Step 5.
or
b) next higher collar hole if throttle plate rubs farthest from washer.
Proceed to Step 5.
9. If all holes have been tried and throttle plate still does not move
freely, the collar should be ground on bottom side to fit (be sure to
keep 125 u surface finish).
****** IMAGE: SEBE4361.00001.001
CAPTION: Location And Orientation Of Parts

Service Claim Allowances

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

Parts Disposition

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.