A malfunctioning fan drive can cause engine cooling problems.
Various fan drive configurations are used to determine when the fan is driven, which include:
โข Direct drive – the fan is engaged all of the time
โข Air engaged/disengaged clutch
โข Electric/electromagnetic clutch
โข Viscous clutch
โข Hydraulic drive
โข Crankshaft/PTO driven.
If the speed of the fan is controlled by an electronic hydraulic controller, check that the controller is plugged in
and functioning properly. Depending on the system design, an inactive hydraulic controller will cause the fan
to always run at either high or low speed. Running at high speed may create excessive loads on the engine; running
at low speed may lead to engine overheating.
Use the following procedure for information on electromagnetic fan clutches supplied by Cummins Inc.
Refer to Procedure 008-026 in Section 8. For other fan clutches, refer to the OEM service manual.
