PULLEY-FAN DRIVE 4N4679 - Caterpillar

Do not operate engine with low oil pressure. Engine damage will result. If measured engine oil pressure is low, discontinue engine operation until the problem is corrected.
Use this procedure in order to troubleshoot low engine oil pressure or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Code List" for information about event codes and the default trip points for these codes.
Table 1
Event Code    
Code and Description    Conditions which Generate this Code    System Response    
E039(2) Low Engine Oil Pressure Derate     The engine oil pressure is below a map-dependent value.     The engine will be derated. The code is logged.    
E040(3) Low Engine Oil Pressure Shutdown     The engine oil pressure is below a map-dependent value.     The engine will shut down. The code is logged.    
E072(1) Oil Level Low Mark     The oil level switch opens.     The code is logged.    
E073(1) Oil Filter Differential Pressure High     The oil filter differential pressure is greater than the trip point.    
E074(1) Oil Filter Differential Pressure Very High     The oil filter differential pressure is greater than the trip point.    
E099(1) Engine Oil Filter Restriction Warning     The oil filter differential pressure is greater than the trip point.    
E100(1) Low Engine Oil Pressure Warning     The engine oil pressure is below a map-dependent value.    Probable Causes
Low engine oil level
Dirty engine oil filters
Restriction at engine oil pump
Restriction in the engine oil cooler
Fuel dilution of engine oil
Camshaft and/or camshaft bearings
Crankshaft bearingsRecommended Actions
Engine Oil Level
Inspect the engine oil level. If engine oil is low add engine oil.Oil Filter
Inspect the engine oil filter. If the engine oil filter is dirty, install a new engine oil filter. Check the operation of the bypass valve for the filter. Clean the bypass valve and the housing. If necessary, install new parts. Engine Oil Pump
Check for blockage of the inlet screen in the engine oil pump. Examine the engine oil pump for excessive wear.Oil Cooler
Inspect the engine oil cooler. Clean the engine oil cooler core and/or install new engine oil cooler core.Fuel Dilution of Engine Oil
Check for presence of fuel in lubricating oil. Refer to the diagnostic procedure Troubleshooting, "Fuel Dilution of Engine Oil".Camshaft and/or Crankshaft
Inspect the camshaft and/or camshaft bearings. Check the components for excessive wear. Excessive wear is an indication of a blocked oil passage. Inspect the crankshaft and/or crankshaft bearings. Check the components for excessive wear.