PRODUCT IMPROVEMENT PROGRAM FOR REPAIRING HEAD SEAL-RELATED FAILURES FOR THE STICK CYLINDER ON CERTAIN 330D EXCAVATORS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR REPAIRING HEAD SEAL-RELATED FAILURES FOR THE STICK CYLINDER ON CERTAIN 330D EXCAVATORS

Usage:

REBE1139-00

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29Aug2006

U-611

A-594

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Priority Parts stock action needed	PRODUCT IMPROVEMENT PROGRAM FOR REPAIRING HEAD SEAL-RELATED FAILURES FOR THE STICK CYLINDER ON CERTAIN 330D EXCAVATORS
5458		PI31142

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NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI31142" as the Part Number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. Exception: If the repair is done after failure, use "PI31142" as the Part Number, "7751" as the Group Number, "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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COMPLETION DATE	TERMINATION DATE
28Feb2007	31Aug2007

PROBLEM

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Hydraulic fluid may leak from the joint between the head assembly and the cylinder assembly for the stick cylinder on certain 330D Excavators. The leaks may be caused by a failed 259-3174 Backup Ring, or by the bore in the cylinder barrel being oversize.

AFFECTED PRODUCT

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Model	Identification Number
330D L	MWP00190-00483, 485-515, 517-525, 527, 529-533, 535-536, 538-542, 545-546, 548, 552, 561-563

PARTS NEEDED

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Qty	Part Number	Description
1	0951726	SEAL-O-RING
1	1982640	RING-BACKUP
1	8T8379	SEAL-HEAD

ACTION REQUIRED

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****Parts Stock****

Remove all 259-3174 Backup Rings from dealer parts stock.

****Affected Product****

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Replace the 259-3174 yellow continuous backup ring in the stick cylinder with a 198-2640 split backup ring. Install a new 095-1726 o-ring seal and a new 8T-8379 seal-head.

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OWNER NOTIFICATION

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U.S. and Canadian owners will receive the attached Owner Notification.

SERVICE CLAIM ALLOWANCES

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****Parts Stock****

Submit one claim for all 259-3174 Backup Rings that are removed from dealer parts stock.

****Affected Product****

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Caterpillar		Dealer Suggested		Customer Suggested
Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
100%	100%	0%	0%	0%	0%

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NOTE: This is a 7.0-hour job

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PARTS DISPOSITION

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****Parts Stock****

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

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****Affected Product****

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

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COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REPAIRING HEAD SEAL-RELATED FAILURES FOR THE STICK CYLINDER

MODELS INVOLVED - 330D L Excavators

Dear Caterpillar Product Owner:

New backup ring and seals need to be installed between the stick cylinder head and the stick cylinder barrel on the products listed below. If the backup ring and seals are not replaced, hydraulic fluid may leak from the joint between the cylinder head and the cylinder assembly of the stick cylinder. The leak results when the 259-3174 Backup Ring fails. You will not be charged for the service performed.

Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service.

Please refer the dealer to their Service Letter dated 29Aug2006 when scheduling this service.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to 29Aug2006 Service Letter

Rework Procedure

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Refer to the Disassembly and Assembly Manual that is appropriate for your machine.

1. Remove the 234-4601 Stick Cylinder Group from the machine.

Image1.1.1

Illustration 1 - Head End Of 234-4601 Stick Cylinder Group
(1) 095-1726 O-Ring Seal
(2) 259-3174 Backup Ring
(3) 8T-8379 Seal-Head(A) Cylinder barrel

2. Disassemble the stick cylinder group. Disassemble the head and the rod assembly from the cylinder assembly.

Image1.2.1

Illustration 2 - Head End Of 242-6806 Cylinder Assembly
(A) Cylinder barrel
(B) 170.0 ? 0.1 mm (6.693 ? 0.004 inch)

3. Measure the inside diameter of the cylinder barrel at the joint for the head seal. The specification for the inside diameter is 170.0 ? 0.1 mm (6.693 ? 0.004 inch).

4. If the inside diameter of the cylinder barrel is oversize, the 242-6806 Cylinder Assembly must be replaced.

5. Install a new 198-2640 Backup Ring Backup Ring in place of the former 259-3174 Backup Ring. Install a new 095-1726 O-Ring Seal and a new 8T-8379 Seal-Head. Use 1U6396 O-Ring Compound.

Reassemble the 234-4601 Stick Cylinder Group. Perform a bench test and make sure that the stick cylinder group does not leak. Reinstall the stick cylinder group on the machine.