Usage:
Problem:
There have been two types of failures of the 7W9416 Main Thrust Bearing reported in truck applications. The two types of failures are "wiping" and "flaking".
Wiping failures occur when the thrust bearing surface temperatures become high enough to melt the lead-tin overlay and aluminum layers of the bearing. Wiping type failures may damage the crankshaft thrust faces and require crankshaft replacement.
Flaking failures start with fatigue cracks in the aluminum layer. This can cause separation between the aluminum layer and the steel backing. Replacement of the thrust bearing is usually all that is required to a "flaking" thrust bearing failure because the crankshaft is seldom damaged.
Solution:
Caterpillar would appreciate the details of any thrust bearing failures, so we can better understand the extent and cause of this problem. We realize not all the information requested on the following page will be readily available. However, the more you can tell us about the failure, the quicker and more accurately we can resolve the problem.
PLEASE KEEP ALL FAILED THRUST BEARINGS, BUT DO NOT CLEAN THEM!
Please share this information with your Chevrolet/GMC TEPS Dealers.
Please call or fax the information on this sheet to:
Wayne D Oder (Product Analyst)Phone: (309) 578-6986
Fax: (309) 578-7423
- Engine/vehicle Identification:
- Vehicle Serial Number
- Vehicle Make and Model
- Engine Serial Number
- Engine Arrangement Number
- Horsepower/rpm Rating
- How is this vehicle used? (application)
- GVW/GCW (Gross Weight)
- Approximate miles per week
- Fuel Consumption
- Vehicle Make and Model
- Repairing Dealer/Customer Identification:
- Dealer Code
- Dealer Name
- Dealer Address
- Dealer Phone Number
- Customer Name
- Customer Address
- Dealer Name
- Failure Information:
- Date
- Miles/SMU
- Part Number
- Dealer Work Order Number
- Customer Complaint (debris in oil, etc.)
- Miles/SMU
- Parts:
- Are replaced parts available for return?
- Transmission And Clutch
- Manufacturer
- Number of speeds (gears)
- Single or double plate clutch
- Adjustments within specifications? (If not, how far off?)
- Prior clutch/transmission repairs/adjustments (date, mileage)
- Number of speeds (gears)
- Additional Comments (Help Us Understand The Failure)
- Significant past repairs or engine history
- Observations of the current failure
- Customer maintenance practices
- Oil (Brand, Grade, current or past history of debris in oil)
- Any unusual operating conditions or components
- External components that could effect thrust loading (front PTO)
- Observations of the current failure
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