PRODUCT SUPPORT PROGRAM FOR ADDING A DIODE INLINE TO THE WIRING HARNESS FOR THE AIR SHUTOFF ON CERTAIN 3508B AND 3512B ENGINES Caterpillar

PRODUCT SUPPORT PROGRAM FOR ADDING A DIODE INLINE TO THE WIRING HARNESS FOR THE AIR SHUTOFF ON CERTAIN 3508B AND 3512B ENGINES

Usage:

SEBE9827-00

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14Oct2005

E140
E310
E351
E450
E459
J33D
M638
N030

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Before/After (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR ADDING A DIODE INLINE TO THE WIRING HARNESS FOR THE AIR SHUTOFF ON CERTAIN 3508B AND 3512B ENGINES
1408 4459		PS42202

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NOTE:

This Program must be administered either before or after failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS42202" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. If administered after failure, use "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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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.

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TERMINATION DATE

14Oct2006

PROBLEM

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These engines need a diode added inline to the air shutoff drive wire in the harness, 134-6316, to prevent the emergency stop button from back-feeding power into the A3 engine control module when depressed.

AFFECTED PRODUCT

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Model	Identification Number
3508B	CBB00350-00396
3512B	4AW01090-01105,4AW01107-01118,4AW01120-01125
	PTM00434-00435

PARTS NEEDED

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Qty	Part Number	Description
2	1863735	PIN-CONNECTOR
1	1552271	PLUG KIT-CONN
1	1230316	DIODE AS

ACTION REQUIRED

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Refer to the rework procedure below.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-5000 hrs	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 2.0 hour job

PARTS DISPOSITION

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Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

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Rework Procedure

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1. Locate wire, (ES-5/F708H/CONNA-15), in the harness. This will be one of the
two wires coming off of ES-5. Be sure you get the right wire, since there are two yellow wires coming off of ES-5 (See Picture below)

2. Cut the wire in two and add two 8t-8729 sockets to each end.

3. Insert the wire coming from ES-5 into spot 4 of the connector, 155-2272. (Note, it is very important to plug the wires into the correct spots due to the diode
only allowing voltage to go in one direction)

4. Insert the wire coming from CONNA-15 into spot 1 of the connector, 155-2272.

5. Plug the diode assembly, 123-0316, into the connector, 155-2272.

6. Tie strap the diode assembly to the harness. (See Picture below)

After installation of the diode above, test the unit with the following steps:

1. With the engine control switch in the OFF/Reset position, apply power to the
engine.

2. Place the engine control switch to the Stop/Cooldown position.

3. Measure voltage between Terminal Blocks 2 and 3 (You should see around 24 Vdc)

4. Depress the Emergency Stop Button (Do not pull the button back out)

5. Measure voltage between Terminal Blocks 2 and 3 (You should see 0 Vdc).

6. If you see 0 Vdc, your update is done. Reset the Emergency Stop button. If
you still see 24 Vdc go back and follow the installation procedure paying close attention to wire numbers and pin locations.