Premature Nose-Cone and King-Pin Wear May Occur on Certain 794, 796, and 798 Off-Highway Trucks {3260, 4314} Caterpillar

Mining Truck

794 AC (S/N: HRT1-UP)

Off-Highway Truck/Tractor

794 AC (S/N: MT51-UP)

796 (S/N: HRZ1-UP)

798 (S/N: ST71-UP)

Reference: Service Magazine, M0103653, "Rear Axle Housing Bearing – Inspect and King-pin (Front) – Inspect Improves Performance on 794 Off-Highway Trucks"

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

Illustration 1	g06419457
Location of nose-cone bearing

Illustration 2	g06419458
Location of left-hand king-pin

Premature nose-cone and king-pin wear may occur on the machines listed above.

Solution

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

Caterpillar is aware of this problem and recommends the following interim corrective action.

Nose-cone bearing and king-pin measurements must be taken at machine commissioning for new machine and anytime the nose-cone bearing and king-pin are replaced.

Inspect nose-cone bearing and king-pin wear every 2,000 hours during bearing and pin life.

Provide the following information to your dealer Technical Communicator (TC): TIB Media Number M0105790, machine serial number, and part hours at failure. Request the Dealer TC to submit the information through Continuous Process Improvement (CPI) feedback within the Service Information Management System (SIMSi).

Note: Refer to Service Magazine, M0103653, "Rear Axle Housing Bearing – Inspect and King-pin (Front) – Inspect Improves Performance on 794 Off-Highway Trucks".