How to Install the Pulley and Motor Bracket on a Belt Drive Fan

By We re still here！ | Published: 2026-10-28

Category: How-to Guides

Learn how to replace the pulley and motor bracket on your belt drive whole house fan, including how to choose the right part based on your fan's purchase date and avoid common mistakes.

Quick answer

To install a pulley and motor bracket on a belt drive whole house fan, first confirm whether your fan was purchased before or after July 22, 2013, then order the correct kit and follow the step-by-step process below.

Why the purchase date matters

The pulley and motor bracket kit is not a one-size-fits-all part. Fans purchased before July 22, 2013 use part XXWHPULLEY6, which includes both the pulley and the bracket. Fans purchased after that date use part XXCASTPULLEY6, which is only the pulley. Ordering the wrong part can delay your repair and may require a return.

If you are unsure of your fan's purchase date, check the original receipt, the fan's serial number, or any manufacturer labels on the unit. When in doubt, contact customer support with your fan's model and purchase date to confirm the correct part.

Tools and safety considerations

Before starting, turn off the fan's power at the circuit breaker to avoid accidental startup. You will likely need a screwdriver, a wrench or socket set, and possibly a puller to remove the old pulley from the motor shaft. Having a second person to hold the motor or bracket can make the job easier and safer.

Inspect the motor shaft and the new pulley for any burrs or damage before installation. A clean, smooth shaft ensures the pulley seats properly and reduces vibration.

Installation steps

Turn off power and remove the old bracket: Disconnect the fan's power at the circuit breaker. Remove the screws or bolts holding the old motor bracket to the fan housing. Carefully detach the bracket and set it aside. If the pulley is seized on the motor shaft, use a pulley puller to avoid damaging the shaft. Check the motor shaft for wear or damage before installing the new bracket.
Install the new bracket: Position the new bracket over the motor mount holes and align it with the motor. Secure it with the provided screws or bolts, tightening them evenly. Make sure the bracket is level and does not interfere with the fan belt. Tighten fasteners in a crisscross pattern to avoid warping the bracket.
Attach the pulley to the motor shaft: Slide the pulley onto the motor shaft, ensuring the keyway (if present) is aligned. Hand-tighten the set screw, then use a wrench to snug it securely. Do not overtighten, as this can strip the threads or distort the pulley. Verify the pulley spins freely and does not wobble before reinstalling the belt.
Reinstall the belt and test: Place the belt over the motor pulley and the fan pulley, adjusting tension so there is about 1/2 inch of play. Rotate the fan by hand to confirm smooth movement. Restore power and run the fan briefly to check for unusual noise or vibration. If you hear a squeal or see wobble, stop the fan and recheck alignment and tension.

Product facts

Pulley and Motor Bracket Kit for Belt Drive Whole House Fans: This kit includes the pulley and bracket for fans purchased before July 22, 2013 (part XXWHPULLEY6). For fans purchased after that date, only the pulley (XXCASTPULLEY6) is needed. Choosing the correct part based on your fan's purchase date ensures the motor and pulley seat correctly and reduces the risk of misalignment or vibration.
Pulley and Motor Bracket Kit for Belt Drive Whole House Fans