PRODUCT SUPPORT PROGRAM FOR INSTALLING NEW HOUSING MODULES TO IMPROVE THE FINAL DRIVE BEARING PRELOAD SYSTEM ON CERTAIN 322C, 322C L, 325C AND 325C L EXCAVATORS

Usage:

SEBE8794-01

May 20, 2004
(Revised May 2004)
D-127

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*After failure only*	PRODUCT SUPPORT PROGRAM FOR INSTALLING NEW HOUSING MODULES TO IMPROVE THE FINAL DRIVE BEARING PRELOAD SYSTEM ON CERTAIN 322C, 322C L, 325C AND 325C L EXCAVATORS
4050		PS50717

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 "PS50717" 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.

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 May 20, 2004 Service Letter. Changes have been made to the Title and the Problem Description.

TERMINATION DATE

May 31, 2006

PROBLEM

New housing modules need to be installed to improve the final drive bearing preload system on certain 322C, 322C L, 325C and 325C L Excavators. The contact stress between 1688452 Bearing and 1695596 Stopper may cause stopper deformation, reduced bearing preload, stopper rotation and internal component damage. The updated module provides a hardened stopper to eliminate deformation, dowels to positively anchor the stopper, housing material hardness is increased and motor housing/stopper thread engagement is increased.

AFFECTED PRODUCT

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Model	Identification Number
*** Group 1 ***
322C	DAA1-140 FED1-173 BLP1-Up
322C L	BKM1-Up

*** Group 2 ***
325C	BTD1-194 AMH1-305 BKW1-238
325C L	BMM1-348

PARTS NEEDED

***** Group 1 ***** 16 - 8T4123 Washer - Hard
16 - 7X2562 Bolt
1 - 950863 Cotter
1 - 951685 Seal - O-Ring
2 - 1584381 Seal
1 - 1719298 Seal - O-Ring
16 - 1798733 Bolt - Hex Head
1 - 2276119 Carrier - Planetary
1 - 2276134 Housing Kit

***** Group 2 *****

16 - 8T4123 Washer - Hard
18 - 8T6430 Bolt
1 - 951685 Seal - O-Ring
1 - 957944 Cotter
1 - 1719298 Seal - O-Ring
2 - 1793427 Seal
16 - 1798733 Bolt - Hex Head
1 - 2276119 Carrier - Planetary
1 - 2276125 Housing Kit

NOTE: Parts listed in above are for the upgrade of a single final drive. If it is determined that the other final drive on the machine is at risk of imminent failure, the dealer can upgrade that drive at the same time.

NOTE: Each dealer will require two 2276119 Planetary Carrier seed units. These carriers are of the updated design and used as exchange carriers for initial repair with the removed carriers to be reworked as per the attached procedure and used in subsequent repairs.

ACTION REQUIRED

See the attached Rework Procedure.

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
0-5000 / 0-36 months	100%	8	0	0	0	0
5001-8000 / 37-60 months	33 1/3%	4	0	0	50%	4
NOTE: This is an 8?hour job. This program provides parts and labor for a single failed drive. If during the repair, it is determined the other drive on the machine may also be at risk of eminent failure, the dealer can decide to rebuild both drives at the same time. In this case the parts and labor claim allowances can be doubled. NOTE: An additional miscellaneous expense for machining both carriers will be allowed up to $200.00. (Documentation to be included in claim.) NOTE: Two seed carriers per dealer may be claimed against the first serial number reworked.

PARTS DISPOSITION

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

Attach. (1-Rework Procedure)

Rework Procedure

If one of the drives is damaged beyond economical repair, a new 2276133 (Group 1) or 2276116 (Group 2) Drive Group may be used.

The 2276134 and 2276125 Modules utilize 2276123 Dowels to positively anchor the 2276118 Stop. The stopper is hardened to eliminate deformation at the interface between the 22761118 Stopper and the 1688452 Bearing.