PRODUCT SUPPORT PROGRAM FOR REWORKING AND REPLACING CERTAIN HYDRAULIC CYLINDERS ON CERTAIN 450F BACKHOE LOADERS Caterpillar

PRODUCT SUPPORT PROGRAM FOR REWORKING AND REPLACING CERTAIN HYDRAULIC CYLINDERS ON CERTAIN 450F BACKHOE LOADERS

Usage:

TEBE4905-01

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08Jul2016

(Revised 17Nov2016)

B370
B373
B374
B375

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Before/After (Limited distribution)	PRODUCT SUPPORT PROGRAM FOR REWORKING AND REPLACING CERTAIN HYDRAULIC CYLINDERS ON CERTAIN 450F BACKHOE LOADERS
5456 5457 5102 5468 5458 5104		PS45142

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NOTE:

Caterpillar’s obligations under this Service Letter are subject to, and shall not apply in contravention of, the laws, rules, regulations, directives, ordinances, orders, or statutes of the United States, or of any other applicable jurisdiction, without recourse or liability with respect to Caterpillar.

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 "PS45142" 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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NOTE:	This Revised Service Letter replaces the 08Jul2016 Service Letter. Changes have been made to the Service Claim Allowance table, from 28.0 hours to 38.0 hours.

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TERMINATION DATE

31Jul2018

PROBLEM

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The existing front loader's lift and tilt cylinders as well as the hoe's boom, stick, bucket, e-stick, and stabilizer cylinders, can have the piston retaining nut come loose on certain 450F Backhoe Loaders. If the existing piston retaining nut loosens and comes off the rod, it can generate metal contamination in the hydraulic system.

AFFECTED PRODUCT

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Model	Identification Number
450F	HJR00150-00152, 169-170, 178-179, 187, 189-194, 198-202, 204, 209-212, 214-221, 240-242, 245-249, 253, 289-291, 293-295, 307, 315, 322-324, 343-345, 351-352, 359-361, 363-365, 380-383, 389, 398-399, 414-421, 427-429, 434-439, 447-451, 477-481, 487-494, 498-502, 511, 518-520, 529-535, 540, 543-544, 557

PARTS NEEDED

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No parts needed for this program

ACTION REQUIRED

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Rework and replace the hydraulic cylinders per the attached Rework Procedure. Refer to the machine's service manual for safety, disassembly/assembly, and specifications for this rework not included in the attached Rework Procedure.

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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%
0-8000 hrs, 0-96 mo	100.0%	100.0%	0.0%	0.0%	0.0%	0.0%

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NOTE: This is a 38.0-hour job
Note: No parts are required as the dealer has been supplied the necessary parts to perform the rework.

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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. Remove the tilt, lift (Qty 2), boom, stick, bucket, e-stick, and stabilizer (Qty 2) cylinders from the machine.

For each cylinder perform the following steps:

2. Capture an image of the cylinder's part number, revision level, build date, and inspection operator ID from the barrel of the cylinder. Refer to Image1.3.1 for an example. This image is to be attached to the SIMS ticket for the machine.

Image1.3.1

3. Disassemble the cylinder and inspect/perform for the following:

- Check for chips in the hydraulic lines connectors. Chips in these areas could be a sign for damaged lock nuts.
- Clean off any contaminant / oil from outside of cylinder.
- Drain all oil from hydraulic cylinder and plug the ports.
- Loosen and remove the head from the barrel.

4. Inspect the crimps for the piston retaining nut found on the piston. Before removing the piston retaining nut, capture an image of the crimps on both sides of the piston nut. This image needs to be attached to the SIMS ticket for the machine. Refer to Image1.5.1 for the locations of the crimps. Refer to Image1.5.2 for a correctly created crimp.

Image1.5.1

Image1.5.2

Refer to Images1.6.1, 1.6.2, and 1.6.3 for examples of incorrectly created crimps.

Image1.6.1

Image1.6.2

Image1.6.3

5. Inspect the piston, rod, and head for chips and scoring.

Note: The piston may be reused if no damage occurs to the piston when bending the existing crimps to facilitate the piston retaining nuts removal.

6. Reassemble the cylinder using new seals and the following tightening specifications:

Piston: 70 +/- 10 N.m (51.5 +/- 7.5 Ft lb.)
Piston retaining nut: 30 +/- 5 N.m (26 +/- 7.5 F lb.)
Crimp both sides of the piston nut. Refer to Image1.8.1 for the proper crimp size and locations.