0583931 JOHNSON HORN ASSY., Warning

Recommended Actions
Review the engine oil SOS report. If the oil sample is flagged for dirt, then dirt is most likely root cause of the turbo failure.
Check the Product Status Report for E391-1 Inlet Air Filter Restriction codes.
If the air filters look new and the last occurrence was prior to the new air filter, then the old air filter would need to be inspected to evaluate filter condition.
There should always be some codes, but if there are an excessive number of occurrences it suggests that the Level 1 codes were ignored.Note: For the Skid Steer Loader, Multi-Terrain Loaders, and Compact Track Loaders. 568-2606 Machine Software Gp added a Level 2 warning for the E391-1 Inlet Air Restriction code. Refer to Service Magazine, M0099547, "New Machine Software Group Is Now Used on Certain Compact Track Loader, Multi Terrain Loader, and Skid Steer Loader" for more details.Note: Operating with a plugged air filter can cause oil to bypass a turbo due to the extreme low pressure on the compressor side of the turbo. Typically, when the air filters are replaced, the oil stops bypassing.
If the turbo failure occurred in the winter, ensure that the correct engine oil is used. Refer to the , "Selecting the Viscosity".
Illustration 1 g06373868
If the turbo failure occurred when temperatures were below -18 °C (0 °F), then:
Ensure that 0W-40 engine oil is being used.
Confirm that the engine has two Closed Crankcase Breather(CCB) heaters installed.
Confirm that both CCB heaters get warm with key ON.
Confirm if the machine was hauled with the engine running. Caterpillar does not recommend that a machine be hauled with the engine running. If this is still done a rear door cover is required, but that does not a guarantee a closed crankcase breather will not freeze.
If the turbo failure occurred when the temperature is -33 °C to -40 °C (-27 °F to -40 °F), then a rear door cover is required during operation to prevent the closed crankcase breather from freezing. Refer to the Operation and Maintenance Manual, "Engine Starting", Cold-Weather Requirements.
Not following the engine warmup can starve the turbocharger of oil. Refer to the Operation and Maintenance Manual, "Engine Starting" for the proper warmup procedure and the longer warmup procedure when it is below 0 °C (32 °F).Note: 568-2606 Machine Software Gp added the turbocharger protection mode feature that helps to ensure that the turbocharger is not starved of oil. The operator still needs to follow the warmup procedure in the Operation and Maintenance Manual. Refer to Service Magazine, M0099547, "New Machine Software Group Is Now Used on Certain Compact Track Loader, Multi Terrain Loader, and Skid Steer Loader" for more details.
Not allowing the engine to cool down for 5 minutes at low idle prior to stopping the engine can cause a turbocharger failure. Refer to Operation and Maintenance Manual, "Stopping the Engine" for more details.
If the turbocharger has failed and allowed oil to bypass into the Diesel Oxidation Catalyst (DOC)/Diesel Particulate Filter (DPF), they must be replaced. If the oil sample shows wear metals, then go to section "Check for Cylinder Wear" to determine the condition of the cylinders.