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1
2
3
1. Condenser Coil
2. Fan Blade Hub
3. Retaining Set Screw
4. 5/16 Ratchet Wrench
Figure 4-9. Condenser Fan Motor Removal
4.16 SERVICING THE EVAPORATOR FAN
BLOWER MOTOR ASSEMBLY
a. Removing, Disassembling and Assembly
1. Switch the rear control switch to the OFF
position.
2. Disconnect the wire leads to the junction box of
the motor. Mark the leads for proper
reassembly. It is not necessary to disconnect
the wire leads when moving the motor
assembly to replace the heater coil.
3. Remove motor mounting bolts to the bottom
panel.
4. Loosen the four venturi mounting nuts. Turn
clip and slide assembly out of the blower
housing.
5. Loosen the two blower hub set screws to
remove blower.
6. To reassemble, reverse the above procedure.
Position blower 1/16 inch overlapping venturi.
(See Figure 4-10.)
4
5
6
Position
1/3 of
blade
height
below
shroud.
7
5. Fan Blade
6. Shroud
7. Fan Blade Guard
1
2
7
1. Blower Housing
2. Fan Blower
3. Unit Frame
4. Venturi Clip Bolt
Figure 4-10. Evaporator Fan Blower Assembly
4.16.1 Routine Examination and Cleaning
a. At regular maintenance periods, remove brush
covers and clean and examine motor interior.
b. Remove all foreign material, such as dirt and
carbon dust from with dry compressed air.
Clean by suction if possible to avoid blowing
foreign matter into the motor.
c. Confirm free moving brushes to prevent
binding.
d. Examine brush wear and general condition. If
brushes
are
chipped, or worn to 1/3 the length of a new
brush, replace them. Refer to section 4.16.2.
e. Examine the condition of the brush springs. A
discolored spring is a sign of overheating
which may weaken the spring, in which case
the spring should be replaced.
f.
Observe the condition of the commutator and
the armature coils that are visible.
4.16.2 Brush Replacement
If brushes are broken, cracked, severely chipped,
or worn to 1/3 their original length, replace the
brush lead assembly.
Due to limited access on some brush
covers, it may be necessary to loosen
motor hold down bolts and rotate motor to
gain workable access to brush holders.
4-11
1/16-inch
3
4
5
5. Venturi
6. Evaporator Motor
7. Hub Set Screw
broken,
cracked,
severely
NOTE
6
T-288
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