Campaign - Front Differential Inspection/Alignment: Overview
No: SB121Ref: H121 issue2
*Issue: 3
Date: 23 November 2005*
Updated information is shown by asterisks and shaded areas.
Front Differential Inspection and Alignment
*NOTE:
The inspection process and the extent of the Service Action have been enhanced over time. Virtually all aspects of the bulletin have been revised. In this edition the availability of a pre-drilled propeller shaft has altered the procedure and adjusted the Warranty process. Warranty claims now use an "Option" which requires listing of all parts used and the specific labor operations used. Please read the complete procedure to familiarize yourself with the new conditions. This Technical Bulletin replaces H121 and its follow-on bulletin SB121.
Change shading is used to identify adjustments since SB 121 Issue 2.*
AFFECTED VEHICLE RANGE:
New Range Rover (LM) 3A101029 to 4A144905
4A146367 to 4A146500
Build dates: 18 April 2002 to 17 June 2003 and
02 July 2003 to 03 July 2003
SITUATION:
PROPER FRONT DIFFERENTIAL ALIGNMENT REQUIRED
The front differential needs to be mounted in the optimum position relative to the transfer box front output flange. Premature wear may occur to the propeller shaft and the drive tube splines if they are not correctly aligned.
RESOLUTION:
INSPECT DIFFERENTIAL FOR ALIGNMENT AND WEAR
NOTE:
This Service Action Bulletin procedure is not to be carried out if the vehicle has already been subject to Service Action H121/B121. Verification of vehicle eligibility for a Service Action should always be performed by a vehicle history investigation and DDW inquiry.
At the next service opportunity inspect the front differential for alignment and potential wear. Observe the NOTES and limitations on parts availability below and replace parts affected by a misalignment condition if necessary. Drilling a hole through the end of the early style propeller shafts to the tube chamber is part of the procedure. As part of the inspection/repair/alignment processes ensure drive tube splines and propeller shaft splines are clean. Application of the specified grease is required during assembly.
PARTS INFORMATION:
NOTE:
Parts to be used depend on the repair requirements after inspection. Refer to individual campaign Option Codes for correct parts.
*NOTE:
The following part numbers are no longer required for this Service Action
^ 0-ring RYX00010 has been deleted from this Service Action. It is integral with the differential assembly.
^ 0-ring QYX00020 has been deleted from this Service Action because of a change in the workshop procedure.
NOTE:
Castrol SAF-X0 is the only Land Rover recommended lubricant for use with a New Range Rover front differential. Castrol SAF-X0 is available from Land Rover as LRN7591.
NOTE:
Land Rover part number TVB000370K has been superseded by a new design predrilled propeller shaft (TVB500290K). If replacement shaft TVB500290K is required, drilling the propeller shaft will not be part of the repair.*
NOTE:
* Orders for differential TBB000041K are no longer restricted.* Replacement of the differential should only be undertaken if inspection reveals seriously worn splines as outlined in this TIB. Limited wear, noises from the spline or the existence of red fretting corrosion are not in-them-selves justification for differential replacement.
NOTE:
Campaign labels are no longer required for Service Action activities. Retailers should maintain a modest supply of labels for future use for certain Recall activities.
DDW WARRANTY CLAIMS:
NOTE:
The previous version of this Service Action (H121 and B121) detailed Option Codes A - D (H121) and then E - G (B121) to check, and where necessary, to realign the differential. This versions details improved workshop procedures that make option codes A - D and E - G obsolete. All claims against Options E - G for previously performed work must be submitted before 01 December 2005. No new claims should be made using Option Codes A - D or E - G. Warranty claims should be submitted quoting program code B121 together with the correct "X" Option Code from the table below with appropriate SRO time and applicable parts expense.
CAMPAIGN LABEL
NOTE:
Campaign labels are no longer required for Service Action activities. Retailers should maintain a modest supply of labels for future use for certain Recall activities.
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