Marathon — Fan Replacement
Repair & overhaul · Ventilating fan and drive hub
From a Marathon service manual — check it applies to your exact model before use.
Procedure
- Using a torch, rapidly heat the drive hub at the outer diameter while tightening the puller.
- Remove the drive hub and key.
- Using a torch, rapidly heat the backside of the fan.
- Using insulated gloves, slide the fan off the shaft.
- Heat the new fan to 400-500 degrees F (204-260 degrees C).
- Using insulated gloves, slide the fan over the shaft until it seats against the shaft shoulder.
- Allow the fan to cool for 30 minutes. Rebalance the rotor assembly.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 400-500 degrees F (204-260 degrees C)
- cool 30 minutes
Source: Marathon service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.