PRODUCT SUPPORT PROGRAM FOR REPLACING THE 1261978 BACK UP RING IN THE STICK CYLINDER HEAD ON CERTAIN 345D HYDRAULIC EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE 1261978 BACK UP RING IN THE STICK CYLINDER HEAD ON CERTAIN 345D HYDRAULIC EXCAVATORS

Usage:

REBE6869-00

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08Jun2011

U-234

A-192

D-214

O-210

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After Failure Only Parts stock action needed	PRODUCT SUPPORT PROGRAM FOR REPLACING THE 1261978 BACK UP RING IN THE STICK CYLINDER HEAD ON CERTAIN 345D HYDRAULIC EXCAVATORS
5458 7750		PS52034

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NOTE:

This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS52034" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

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NOTE:

When submitting claim for Parts Stock Action, Use the appropriate 99Z as the s/n, the appropriate Service Letter Program Number as the Part number in the Part Causing Failure field, "7755" as the Group Number, "56" as the Description Code.

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NOTE:

Although this Program is to be administered as described above on the Affected Product, parts should be removed from parts stock as soon as possible.

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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

30Jun2013

PROBLEM

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The existing 1261978 Back Up Ring may be oversized with incorrect relief cut geometry on certain 345D Hydraulic Excavators. If the existing back up ring does not provide proper support to the sealing 0951730 O-ring it will cause the O-ring to fail resulting in a head to cylinder assembly hydraulic fluid leak.

AFFECTED PRODUCT

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Model	Identification Number
345D L	EEH00317-01062 KFH00211-00242, 244-246 MLK00161-00183 RAJ00259-00387 RGD00141-00149 RGG00108-00199, 201-269 YEE00253-00643
345D LC-VG	LKY00251-00382 NLM00231-00239
345D OEM	P5D00101-00158

PARTS NEEDED

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Qty	Part Number	Description
2	1P3704	SEAL-RECTANGULAR (if Required)
1	1P3705	SEAL-RECTANGULAR (if Required)
1	0951730	SEAL-O-RING (Also included in SEAL KIT 2254646/">2254646)
1	1261978	RING-BACK UP (Also included in SEAL KIT 2254646/">2254646)
1	2254646	SEAL KIT (If seals found damaged at disassembly.)
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 1% 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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****Parts Stock ****

Remove all translucent or white 1261978 Back Up Rings from dealer parts stock. Only Charcoal colored Back Up Rings should be used. Confirm Seal Kit (225-4646) contains proper back up ring as well.

****Affected Product****

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If a leak is found at the head to barrel assembly, replace 0951730 O-ring and 1261978 Back Up Ring. (Note: The 225-4646 Seal Kit should only be used if seals are found damaged at disassembly.)

Refer to the Service Manual if/as necessary and use standard disassembly and assembly procedures.

1. Remove the stick cylinder group from the machine.

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

3. Install a new 095-1730 O-Ring Seal and a new 126-1978 Backup Ring in the cylinder head. Use 1U6396 O-Ring Compound.

Reassemble the 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.

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SERVICE CLAIM ALLOWANCES

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****Parts Stock****

Submit one claim for all parts removed from dealer parts stock.

****Affected Product****

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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%
0-3000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
3001-6000 hrs, 25-36 mo	33.0%	50.0%	0.0%	0.0%	50.0%	50.0%

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NOTE: This is a 11.2-hour job If there has been a previous repair, part age/hours will apply. Retain a copy of the previous repair invoice in the dealer's records for audit purposes, and specify repair date and machine hours in the "Additional Comments" section of the warranty claim.

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