Product Support Program For Replacing Failed Track Idlers On Certain Challenger 65 And Challenger 75 Tractors Caterpillar

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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.

NOTE: This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4715" 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: This Program does not allow for any labor to remove and install the belts and idlers. Since the idlers must be removed to install the drain plugs, it is recommended that this Program be implemented at the same time as the January 25, 1992 Service Letter - PI1186 and the January 26, 1992 Service Letter - PS3574.

Termination Date

January 31, 1993

Problem

The fatigue life of the 1R0868 Idler may not be as long as desired on certain Challenger 65 and Challenger 75 Tractors. A failed idler can also cause damage to the MTS Belts.

Affected Product
Model & Identification Number

Ch 65 (7YC1-2500)

Ch 75 (4CJ1-500

Parts Needed

2 - 1R0868 Idler

2 - 1R0869 Tube

Action Required

Replace the failed idler and the idler on the same side of the tractor. At the same time, inspect the guide block sides of the idlers on the other side of the tractor for signs of possible fatigue failure. If such signs are present, replace the idlers showing the symptoms. This does not cover punctures, abuse, or failures due to under-inflation.

The illustration shows the area of the idlers that will first experience a fatigue failure. Check the guide block side of the idlers. Look for slight diametral bulging of the three ridges molded into the sidewall near the bead area. Also, look for signs of sidewall bubbles near the bead area. It takes a good light and two repositioning of the tractor to make this inspection with the idlers in place. This fatigue type failure may occur before any air is lost from the tube.

Service Claim Allowances

NOTE: This Program does not allow for any labor to remove and install the belts and idlers. Since the idlers must be removed to install the drain plugs, it is recommended that this Program be implemented at the same time as the January 25, 1992 Service Letter - PI1186 and the January 26, 1992 Service Letter - PS3574

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^*The belt and idler removal required for the above Service Letter is the bulk of the labor required here. If idlers are replaced, the dismount and mount labor of 1 hour and the balance of the parts charge are for the customer.

Parts Disposition

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