PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING THE FRONT STRUT TO SPINDLE 1D-4643 RETAINER BOLTS ON CERTAIN 785C, 785D, 789C, AND 789D OFF-HIGHWAY TRUCKS Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING THE FRONT STRUT TO SPINDLE 1D-4643 RETAINER BOLTS ON CERTAIN 785C, 785D, 789C, AND 789D OFF-HIGHWAY TRUCKS

Usage:

REBE7890-01

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21Dec2011

(Revised 04Jan2012)

U-578

A-470

D-500

O-507

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*Priority*	PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING THE FRONT STRUT TO SPINDLE 1D-4643 RETAINER BOLTS ON CERTAIN 785C, 785D, 789C, AND 789D OFF-HIGHWAY TRUCKS
7201		PI31965

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NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI31965" as the Part Number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. Exception: If the repair is done after failure, use "PI31965" as the Part Number, "7751" as the Group Number, "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 21Dec2011 Service Letter. Changes have been made to Affected Product.

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COMPLETION DATE	TERMINATION DATE
30Jun2012	31Dec2012

PROBLEM

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The existing 1D-4643 Bolts for the 6G-6534 Front Spindle Retainer Plate may have been improperly tightened on certain 785 and 789 Off-Highway Trucks. The existing 1D-4643 Bolts can loosen and cause front spindle to strut wear or separation.

AFFECTED PRODUCT

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Model	Identification Number
785C	APX01873-01917
785D	MSY00257-00287
785D OEM	DMC00127-00128
789C	2BW01881-01942
789D	SHH00288 SPD00169

PARTS NEEDED

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No parts needed for this program

ACTION REQUIRED

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The conformance to the torque specification may be evaluated by a static inspection torque after assembly. Inspect the joint for looseness or damage and check the static torque.

The 1D-4643 Bolts do not have a torque turn requirement so they may be checked using a static torque check. The torque that the fastener, threaded connector, etc., shall withstand without movement. Static inspection torque provides an indication that minimum assembly requirements have been achieved. Each bolt of the circle of bolts should be checked to 1075 N.m (793 lb ft). If movement is found on any bolt, finish tightening to 1125 +/-50 N.m (830 +/- 37 lb ft).

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OWNER NOTIFICATION

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U.S. and Canadian owners will receive the attached Owner Notification.

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
100%	100%	0%	0%	0%	0%

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NOTE: This is a 2.0-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.

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

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COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR INSPECTING THE FRONT STRUT TO SPINDLE 1D-4643 RETAINER BOLTS ON CERTAIN OFF-HIGHWAY TRUCKS

MODELS INVOLVED - 785C, 785D, 789C, and 789D Off-Highway Trucks

Dear Caterpillar Product Owner:

The existing 1D-4643 Bolts for the 6G-6534 Front Spindle Retainer Plate may have been improperly tightened on certain 785 and 789 Off-Highway Trucks. The 1D-4643 Bolt torque needs to be inspected on the products listed below. The existing 1D-4643 Bolts can loosen and cause front spindle to strut wear or separation. You will not be charged for the service performed.

Contact your local Caterpillar dealer immediately to schedule this service. The dealer will advise you of the time required to complete this service.

Please refer the dealer to their Service Letter dated 21Dec2011 when scheduling this service.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to 21Dec2011 Service Letter