The Cummins Inc. developed electromagnetic fan clutch product is an integrated package with the clutch, bracket,
shaft, bearings, pulley, and fan spacer designed as a unit.
When cooling is needed, an electromagnet engages the fan . The fan is either fully engaged or fully disengaged.
The electromagnetic fan clutch is driven by a poly-vee drive belt and is available with an accessory drive for vee-
drive belts.
All fan clutches can be controlled by the engine ECM. The ECM monitors coolant temperature and intake manifold
temperature to determin e when to engage the cooling fan.
Some applications have additional sensors monitored by the ECM for fan control (for example, air conditioner
pressure and transmission temperature). The OEM can also install a manual override switch to engage the clutch
manually at the operator’s command.
The ECM is capable of using either a 0-VDC or 12-VDC signal to engage the fan clutch. The exact enable logic
can be selected in the Features and Parameters section of the IN SITE’M electronic service tool.
Refer to the equipment manufacturer’s service manual for fan clutch troubleshooting and repair information.
These are various fan clutch types such as:
โข Air engaged
โข Air disengaged
โข Electric
โข Viscous
โข On-off.
This procedure only applies to Cummins Inc. supplied electromagnetic fan clutches. For other fan clutches, refer
to the OEM service manual for all service related information.
