PRODUCT SUPPORT PROGRAM FOR INSPECTING AND TIGHTENING THE LOCK NUTS FOR THE BUCKET AND STICK CYLINDERS ON CERTAIN 312C, 312C L, 315C, AND 315C L HYDRAULIC EXCAVATORS Caterpillar

PRODUCT SUPPORT PROGRAM FOR INSPECTING AND TIGHTENING THE LOCK NUTS FOR THE BUCKET AND STICK CYLINDERS ON CERTAIN 312C, 312C L, 315C, AND 315C L HYDRAULIC EXCAVATORS

Usage:

SEBE9386-03

November 5, 2005
(Revised May 2006)
U-351
A-260
D-276

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*before or* *after failure*	PRODUCT SUPPORT PROGRAM FOR INSPECTING AND TIGHTENING THE LOCK NUTS FOR THE BUCKET AND STICK CYLINDERS ON CERTAIN 312C, 312C L, 315C, AND 315C L HYDRAULIC EXCAVATORS
5457 5458		PS41950

NOTE: This Program can 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 "PS41950" as the Part number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

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.

NOTE: This Revised Service Letter replaces the November 5, 2005 (Revised February, 2006) Service Letter. Changes have been made to the Service Claims Allowance.

TERMINATION DATE

November 30, 2006

PROBLEM

The piston locknuts in the bucket and stick cylinders may come loose on certain 312C, 312C L, 315C, and 315C L Hydraulic Excavators.

AFFECTED PRODUCT

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Model	Identification Number
312C	FDS415-9999
312C L	CBA2690-9999
315C	AKE206-9999 CFB146-9999
315C L	CFT1370-9999 CJC2620-9999

PARTS NEEDED

No parts are needed for this program.

ACTION REQUIRED

Refer to your machines Disassembly and Assembly Manual for instructions on removing, disassembling, assembling, and installing the bucket and stick cylinders.

Remove the bucket and stick cylinders.
Measure and record the static torque of the locknut in the tighten/clockwise direction. Please document this information in the claims story.
Remove the locknut and apply Thread Lock 155-0695 to the threads.
Install the locknut. Use the table below in order to determine the correct torque for your cylinder assembly.

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Model	Cylinder	Cylinder Assembly	Locknut Part Number	Torque
312C and 312C L	Bucket	170-9808	143-8149	3100 ± 160 N·m (2285 ± 120 lb ft)
312C and 312C L	Bucket	248-7855	143-8149	3100 ± 160 N·m (2285 ± 120 lb ft)
312C and 312C L	Stick	194-8312	143-8151	5100 ± 260 N·m (3760 ± 190 lb ft)
312C and 312C L	Stick	251-2894	143-8151	5100 ± 260 N·m (3760 ± 190 lb ft)
315C and 315C L	Bucket	173-3490	133-6686	3600 ± 180 N·m (2655 ± 130 lb ft)
315C and 315C L	Bucket	173-3493	143-8150	4500 ± 230 N·m (3320 ± 170 lb ft)
315C and 315C L	Stick	173-3486	147-5835	6300 ± 320 N·m (4650 ± 235 lb ft)

Assemble the cylinder.
Install the cylinders back onto the machine.

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
0-1500	100%	8.0	0	0	0	0
NOTE: This is a 8.0?hr job. NOTE: This claim will not be paid unless the torque data requested in Step 2 of the Action Required is included in the claim story for the claim.