Scuffing/Scoring May Occur in Bevel Gear Set on Certain 992K and 854K Wheel Dozers {3254, 3256, 3257, 3258} Caterpillar


Scuffing/Scoring May Occur in Bevel Gear Set on Certain 992K and 854K Wheel Dozers {3254, 3256, 3257, 3258}

Usage:

854K 221
Wheel Dozer
854K (S/N: 2211-UP; KK31-UP; RM31-UP; KK61-UP; RM61-UP; H9K1-UP; H8M1-UP)
Wheel Loader
992K (S/N: 8801-UP; KK21-UP; RM21-UP; KK41-UP; RM51-UP; H4C1-UP; ZMX1-UP)

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 1g06206006
(A) 129-6425 Pinion Shaft
(B) 100-7418 Bevel Gear

Scuffing/Scoring may occur in 129-6425 Pinion Shaft (A) and 100-7418 Bevel Gear (B) of differential and bevel gear group on certain 992K and 854K Wheel Dozers. The scuffing/scoring may lead to increased levels of iron in Service Oil Sampling (S·O·S) samples. Increase in the level of scuffing may lead to failure of gear set.

Solution

Caterpillar is aware of this problem, but an interim repair has not been defined.

Refer Reuse And Salvage Guidelines, SEBF8193 , "Reusability of Drive Train Gears" under the section Adhesive wear (Scoring) to determine severity of the scuffing. If the bevel gear set does not meet these reusability guidelines, then replace with same part number.

Bevel gear scuffing can occur as the result of excessive loads and/or thin lube films. If bevel gear scuffing is found, investigate the following:

  • Check the application and operation to determine if it is a high severity application or if frequent overloading is occurring.

  • Check if any axle overheating alarms have been logged, as excessive axle temperatures can lead to thin lube films.

  • Check S·O·S oil sample history and current oil viscosity that is being used to ensure that it is the proper viscosity of oil for the ambient temperature range.

  • In cold environments, monitor axle temperatures and the application before moving away from the factory fill viscosity (TDTO SAE 50). As multiple shifts or continuous operations can result in axle temperatures to be near normal operating temperatures, for which the factory fill viscosity would still be recommended.

Caterpillar Information System:

Replacement Solenoid Valves May Fail on Certain Transmissions {3073, 3167, 3174, 5479, 7499} Replacement Solenoid Valves May Fail on Certain Transmissions {3073, 3167, 3174, 5479, 7499}
Recommendations for Calculating Service Brake Shimming During Axle Repairs on Certain Telehandlers {5486} Recommendations for Calculating Service Brake Shimming During Axle Repairs on Certain Telehandlers {5486}
A Procedure to Rework the Air Conditioner Group Filter Cover Is Used for Certain K-Series and M-Series Medium Wheel Loaders {7320, 7342} A Procedure to Rework the Air Conditioner Group Filter Cover Is Used for Certain K-Series and M-Series Medium Wheel Loaders {7320, 7342}
D6K2 Track-Type Tractor Machine Systems Ripper Lift Cylinder - Remove and Install
C7.1 Engines Welding Precaution
D6K2 Track-Type Tractor Machine Systems Accumulator (Hydraulic) - Remove and Install
D6K Track-Type Tractor Fuses and Circuit Breakers - Replace/Reset
An Improved Track Adjuster Yoke Allows for a Higher Rated Fuse Plate That Will Provide a More Reliable and Durable Recoil System is Now Used On Certain D3K2, D4K2, and D5K2 Track-Type Tractors {4157} An Improved Track Adjuster Yoke Allows for a Higher Rated Fuse Plate That Will Provide a More Reliable and Durable Recoil System is Now Used On Certain D3K2, D4K2, and D5K2 Track-Type Tractors {4157}
C27 and C32 Engine for MD6250 and MD6310 Drill Engine Misfires, Runs Rough or Is Unstable
Improved Angle Cylinder Pin Designs Are Now Available For Certain D6T Track-Type Tractors {6052, 6060, 6701} Improved Angle Cylinder Pin Designs Are Now Available For Certain D6T Track-Type Tractors {6052, 6060, 6701}
Installation Procedure For Updating Angle Cylinder Pins on Certain D6T Track-Type Tractors {6052, 6060, 6701} Installation Procedure For Updating Angle Cylinder Pins on Certain D6T Track-Type Tractors {6052, 6060, 6701}
C32 Tier 4 Final Marine Commercial Engines Crankcase Pressure Is High
An Improved Sealing Process for Air Conditioning Cover Bolts and Bosses on Certain Series K, Series L, Series M, and Series GC Medium Wheel Loaders {7320} An Improved Sealing Process for Air Conditioning Cover Bolts and Bosses on Certain Series K, Series L, Series M, and Series GC Medium Wheel Loaders {7320}
994K Wheel Loader Systems Air Lines
320GC, 320 and 323 Excavators Machine Systems Stick - Remove and Install
D6K Track-Type Tractor Fuel System Primary and Secondary Filters - Replace
D6K2 Track-Type Tractor Machine Systems Ripper Control Linkage - Remove and Install
D6K Track-Type Tractor Engine Air Filter Primary and/or Secondary Element - Clean/Replace
320GC, 320 and 323 Excavators Machine Systems Main Control Valve - Disassemble
320 GC, 320 and 323 Excavator Belt - Inspect/Adjust/Replace
D6K Track-Type Tractor Backup Alarm - Test
D6K Track-Type Tractor Backup Alarm
D6K Track-Type Tractor Fuel System - Prime
D6K2 Track-Type Tractor Machine Systems Hydraulic Tank - Remove and Install
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.