PRODUCT SUPPORT PROGRAM FOR REPLACING THE STICK CYLINDER ASSEMBLY ON CERTAIN 330C EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REPLACING THE STICK CYLINDER ASSEMBLY ON CERTAIN 330C EXCAVATORS [REBE2976]

HYDRAULIC SYSTEM

CYLINDER GP

PRODUCT SUPPORT PROGRAM FOR REPLACING THE STICK CYLINDER ASSEMBLY ON CERTAIN 330C EXCAVATORS

REBE2976-00

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04Feb2008

U-57

A-48

O-52

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*After Failure Only*	PRODUCT SUPPORT PROGRAM FOR REPLACING THE STICK CYLINDER ASSEMBLY ON CERTAIN 330C EXCAVATORS
5458		PS51441

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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 "PS51441" 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:

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 AVSpare product analyst.

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TERMINATION DATE

29Feb2012

PROBLEM

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Excessive deflection or deformation of the stick cylinder flange due to high snubbing pressures in the cylinder may cause failure of the backup ring and the seal, and result in leakage of hydraulic fluid from the head to cylinder assembly joint.

A cylinder assembly with a solid flange that butt welds to the cylinder tube is now available to replace the cylinder assembly that has a flange press fit over the cylinder tube. The cylinder assembly with a solid flange is more resistant to high snubbing pressure and thus will reduce head to cylinder assembly leaks.

AFFECTED PRODUCT

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Model	Identification Number
330C FM HW	B4N00181-00198, 1001-1018
330C FM ST	B3M00197-00199, 502, 1001
330CL	DKY00142-04609, 23434

PARTS NEEDED

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Qty	Part Number	Description
1	7Y4945	RING-BACK UP
1	0951726	SEAL-O-RING
1	2897764	CYLINDER AS
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 2% 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 stick cylinder assembly per the rework procedure.

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SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	AVSpare		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
0-4000 hrs, 0-24 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%
4001-8000 hrs, 25-48 mo	33.3%	50.0%	0.0%	0.0%	50.0%	50.0%

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NOTE: This is a 7.0-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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Refer to the Disassembly and Assembly Manual that is appropriate for your machine.

1. Remove the 191-5551 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.

Image1.1.1

Illustration 1 - Head End Of 191-5551 Stick Cylinder Group

(1) 095-1726 O-Ring Seal
(2) 7Y-4945 Backup Ring
(A) Cylinder barrel

Image1.2.1

Illustration 2 - Flange End Of 191-5620 Cylinder Assembly

(A) Cylinder barrel
(B) 170.0 +/- 0.1 mm (6.693 +/- 0.004 inch)

3. Replacement of the cylinder assembly is not mandatory, but if there have been repeated seal failures or the seal failure occurred at low hours, replacement of the cylinder assembly is recommended.

If the cylinder assembly is being considered for reuse, 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 191-5620 Cylinder Assembly must be replaced by a 289-7764 Cylinder Assembly.

Image1.3.1

Illustration 3 - Flange End Of 289-7764 Cylinder Assembly

5. Install a new 095-1726 O-Ring Seal and a new 7Y-4945 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.