L.B. White Pilot - Manual (Page 60)

Model 377/379
Fan and Motor
Servicing
Instructions
Cleaning aand R Replacing tthe FFan:
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Remove the access panel at the end of the heater
opposite burner.
3. Remove the air inlet ring screws.
4. Using the appropriate wrench, loosen the fan wheels
set screw.
5. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary. All L.B. White fan wheels
incorporate a wheel puller groove on the fan hub to
assist in fan removal.
6. Clean the fan wheel using a soft brush, rag, or
compressed air paying particular attention to
individual fan blades to remove dirt build up.
Replacing tthe M Motor
Follow steps 1 - 5 above and then proceed as follows:
1. Remove the four nuts that hold the motor to the
housing panel.
2. Pull the motor from the housing. To allow easier motor
removal you may need to remove the thermostat or
junction box from the heater’s base.
3. Disconnect the motor leads
4. To reassemble, reverse all procedures.
IMPORTANT
■ Make sure that the fan does not rub on the inlet ring
of the fan housing.
■ Make sure set screw(s) of fan are on flats of motor
shaft when tightening.
■ Fan wheel to inlet ring spacing must be 1/8 in.
before tightening fan to shaft.
August 1999
8.2-2 2
Nut
Set S Screw