PRODUCT SUPPORT PROGRAM FOR REPLACING 250A UL CIRCUIT BREAKERS WITH 400A UL CIRCUIT BREAKERS ON CERTAIN C6.6 GENERATOR SETS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING 250A UL CIRCUIT BREAKERS WITH 400A UL CIRCUIT BREAKERS ON CERTAIN C6.6 GENERATOR SETS

Usage:

REBE7423-00

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15Aug2011

N020
N030
N050
N140

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Before/After (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR REPLACING 250A UL CIRCUIT BREAKERS WITH 400A UL CIRCUIT BREAKERS ON CERTAIN C6.6 GENERATOR SETS
1420 4461		PS43346

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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 "PS43346" 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

31Aug2013

PROBLEM

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The existing 250A circuit breakers fitted to the affected products are 80 percent UL rated. Given the rating of the generator sets in 600V standby applications, the expected full load current exceeds the UL rating of the circuit breakers.

AFFECTED PRODUCT

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Model	Identification Number
C6.6	N6D01648, 1738, 1750, 1969, 2019, 2085, 2150, 2161, 2220, 2224, 2228

PARTS NEEDED

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Qty	Part Number	Description
1	2637713	BREAKER AS
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 14% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.

ACTION REQUIRED

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Replace the 250A circuit breaker with a 400A rated circuit breaker.

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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%
0-1000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 1.0-hour job

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PARTS DISPOSITION

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

Rework Procedure

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1. Isolate generator set before commencing any work on the unit. Ensure health and safety requirements are adhered to at all times. Also ensure proper Lock Out-Tag Out procedures are followed at all times while work is being performed on the system. Lock out the generator set before commencing any type of work.

2. Remove the circuit breaker cover (1) by unscrewing the six bolts (2) securing it to the circuit breaker panel. Refer to Image1.2.1. Retain the bolts, washers, and cover for later use.

Image1.2.1

3. Confirm the system is isolated at the load side.

4. Using a 8mm allen wrench, disconnect the power cables (1) at the generator and load sides of the circuit breaker (2). Refer to Image1.4.1.

Image1.4.1

5. Remove the circuit breaker assembly (1) from the circuit breaker bracket (2) by using a Phillips screwdriver to loosen the four screws (3) securing the circuit breaker to the bracket. Care should be taken to ensure that the circuit breaker does not fall during the process, injury or damage could result if care is not taken. Refer to Image1.5.1.

Image1.5.1

6. Fit the replacement 400A 263-7713 Breaker As. (1), to the circuit breaker bracket (2) using the four of screws (3) supplied with the circuit breaker. Tighten the screws to 2 Nm. Refer to Image1.6.1.

Image1.6.1

7. Using the fasteners supplied with the circuit breaker, reconnect the power cables (1) to the top and bottom of the circuit breaker. Tighten the allen screws to 28 Nm. Refer to Image1.7.1.