M11 Plus Series Engines Operation and Maintenance Manual – 008-030   Fan Drive Idler Pulley Assembly

NOTE: For non-Cummins fan hub installations, contact the OEM.

Loosen the fan idler pulley shaft locknut.

Loosen the adjusting mechanism and move the fan idler pulley and fan pulley centers as close as possible.

Remove the fan belt. Refer to Procedure 008-002 (Drive Belt, Cooling Fan) in Section A.

Remove the roll pin and washer from the idler pulley adjusting screw.

Remove the locknut and washer from the back of the idler pulley shaft.

Remove the adjusting screw.

Remove the fan idler pulley from the fan hub support bracket.

NOTE: Do not tighten the locknut until the fan drive belt has been installed and adjusted.

Align the adjusting screw hole in the idler pulley shaft.

Install the idler pulley in the fan hub support bracket.

Install the washer and locknut on the idler pulley shaft.

Install the adjusting screw in the idler pulley shaft.

Turn the adjusting screw in far enough to install the washer and roll pin in the shaft at the bottom of the fan hub support bracket.

Install and adjust the fan drive belt. Refer to Procedure 008-002 (Drive Belt, Cooling Fan) in Section A.

Tighten the idler pulley shaft locknut.

Check the belt tension again after the locknut is tightened.