DISC-FRICTION 6Y7925 - Caterpillar

Probable Causes
Engine Oil
Contaminated Air
Contaminated FuelRecommended Actions
The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Check the Engine Oil
A. Obtain an S O S oil sample.
B. Check the engine oil pressure.
Engine Oil
Result: The engine oil is OK.
Proceed to Test Step 2.
Result: The engine oil is NOT OK.
Repair: Make the necessary repairs and return to service.
If the repair does not resolve the problem, proceed to Test Step 2.
2. Check for Leaks in the Air System
A. Inspect the air intake system for streaks which may indicate a leakage of unfiltered air. Inspect all of the gaskets and the connections.
Air System
Result: The air system is OK.
Proceed to Test Step 3.
Result: The air system is NOT OK.
Repair: Make the necessary repairs and return to service.
If the repair does not resolve the problem, proceed to Test Step 3.
Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Table 2
Troubleshooting Test Steps Values Results
3. Inspect the Fuel Filters for Contamination
A. Remove the fuel filters. Inspect the fuel filters for contamination. Contaminants in the fuel such as hydrogen sulfide and sulfur can lead to the formation of acids in the crankcase.
Fuel Filters
Result: The fuel filters are OK.
Result: The fuel filters are NOT OK.
Repair: Replace the fuel filters. Refer to the Operation and Maintenance Manual.