This type of fan clutch is activated when 0-VDC from the vehicle electrical system is applied.

The clutch will disengage when 12-VDC is applied.

If the fan does not operate within the temperature range on the Thermal Control Setting Chart located in the front of this section, the fan clutch and the controls must be checked. Refer to the OEM service manual.

To operate, the Cummins® electric fan clutch must receive 0-VDC to engage and 12-VDC to disengage. Use the following manuals to make sure correct electrical connections have been made. Reference the CELECT™ Troubleshooting and Repair Manual, Bulletin 3666084 or CELECT™ Plus Troubleshooting and Repair Manual, Bulletin 3666130.

Inspect the wires and harnesses to make sure none are broken or shorted. Replace harnesses or wires that are broken.

The Cummins® electric fan clutch contains an electromagnetic coil. If the fan is not operating and all the electrical circuits are okay, the coil can have an open circuit.

Measure the continuity across the isolated coil. Connect one volt-ohm meter lead to pin-A in the fan clutch connector. Connect the other lead to pin B.

The resistance must be approximately 8 ohms. If the resistance is not 8 ohms, replace the fan clutch.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the (-) negative battery cable first and attach the negative battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the cooling fan from the engine. Refer to Procedure 008-040 in Section 8.
• Remove the fan drive belt. Refer to Procedure 008-002 in Section 8.

Disconnect the fan clutch connector on the base harness from the fan clutch.

Loosen the fan idler pulley shaft lock nut.

Turn the adjusting screw counterclockwise to release the fan belt tension.

Remove the fan hub, clutch, and capscrews from the engine.

Install the fan hub, clutch, and capscrews. Tighten the capscrews alternately and evenly.

Connect the fan clutch connector on the base harness to the fan clutch.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the (-) negative battery cable first and attach the negative battery cable last.

• Install the fan belt. Refer to Procedure 008-002 in Section 8.
• Install the cooling fan. Refer to Procedure 008-040 in Section 8.
• Connect the batteries. Refer to the OEM service manual.