PRODUCT SUPPORT PROGRAM FOR REMOVING THE 3E-6477 AC RELAY FROM THE AIR CONDITIONER GROUP ON CERTAIN 320D, 324D, AND 325D FOREST MACHINES, 541B, AND 552B TRACK FELLER BUNCHERS, AND 568 FOREST PRODUCTS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REMOVING THE 3E-6477 AC RELAY FROM THE AIR CONDITIONER GROUP ON CERTAIN 320D, 324D, AND 325D FOREST MACHINES, 541B, AND 552B TRACK FELLER BUNCHERS, AND 568 FOREST PRODUCTS

Usage:

REBE9308-00

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14Dec2012

U-681

A-535

D-577

O-620

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*Before/After*	PRODUCT SUPPORT PROGRAM FOR REMOVING THE 3E-6477 AC RELAY FROM THE AIR CONDITIONER GROUP ON CERTAIN 320D, 324D, AND 325D FOREST MACHINES, 541B, AND 552B TRACK FELLER BUNCHERS, AND 568 FOREST PRODUCTS
7320		PS43801

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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 "PS43801" 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

31Dec2013

PROBLEM

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The existing 372-5222 Conditioner Group can fail to cycle the air conditioner compressor on certain 320D, 324D, and 325D Forest Machines, 541B, and 552B Track Feller Bunchers, and 568 Forest Products. The 3E-6477 AC Relay and 338-1942 Control Group were both installed in the AC system. This results in AC Compressor not cycling and poor AC performance due to evaporator coil freezing up.

AFFECTED PRODUCT

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Model	Identification Number
320D FM HEEL	GKS00275-00323
320D FM HW	EAX00277-00311
324D FM	JKR01376-01395
324D FM HEEL	JLS01474-01479
325D FM	C7K01456
325D FM HEEL	C8L01560-01564
541B	F7D00190-00208
552B	F7G00170-00173
568	YJX00100-00110
568 LL	BRB00200-00230

PARTS NEEDED

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No parts needed for this program

ACTION REQUIRED

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Remove the 3E-6477 AC Relay from the 374-2088 Harness Assembly and cover the electrical connector with black electrical tape. Refer to the attached Rework Procedure.

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Image1

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%
0-6000 hrs, 0-48 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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Rework of AC system to remove the 3E-6477 AC Relay to cycle the AC compressor and avoid evaporator freeze up.

Step 1. Inside of the cab, move and tilt the seat as far forward as possible.

Step 2. Remove bolts and open top plate(hinged) covering the air conditioner unit.

Step 3. Check to assure the 338-1942 Control Group harness connector is plugged into the 374-2088 Harness Assembly. Refer to Image 1.2.1.

Step 4. Remove the 3E-6477 Relay from harness connector with the following wire pin outs. Refer to Image 1.2.2.

pin 30 ... 124 Green wire
pin 85 ... 220 Black wire
pin 87 ... 554 Pink wire
pin 86 ... 567 White wire

Step 5. Tape over the relay base to seal it off.

Note: Failure to remove the relay will allow the compressor to run constantly.

Step 6. Rework is complete, reassemble the machine.