TM 9-4120-388-14
4-62. EVAPORATOR FAN - Continued.
b. Inspect.
(1) Check fan for dents, bent or loose fan blades, and that hub is securely attached. Replace if damaged.
(2) Check inlet bell for dents or any distortion that would cause interference with fans. Replace if damaged.
(3) If a motor problem is suspected, inspect or test motor in accordance with paragraph 4-63.
c. Clean.
(1) Use a dean dry cloth and a soft brush to remove dirt from fan.
(2) If fan and inlet bell are excessively dirty, wash them with a mild detergent and water solution.
Take care that hardware does not drop down into unit.
(1) Remove four screws and flat washers.
(2) Lift inlet bell up and out of unit.
e. Evaporator inlet bell installation.
(1) Place inlet bell in unit and align mounting holes.
NOTE
Flat edge on inlet bell should be toward evaporator coil.
(2) Secure inlet bell with four screws and flat washers.
f.
Fan installation.
(1)
Be sure that shaft key is in place. If it is taped in place, remove tape.
(2)
Align keyway and shaft key and slip fan down onto motor shaft.
(3)
Using shims (as required) between fan and shoulder on motor shaft, position fan on shaft so there is 0.03
to 0.06 inch (0.7 to 1.5 mm) clearance between the fan and the inlet bell.
(4)
Install lock nut on end of shaft. Lock nut should be snug against fan.
Spin fan by hand and be sure that there is still 0.03 to 0.06 inch (0.7 to 1.5 mm) clearance between fan and
(5)
inlet bell. Adjust fan if necessary.
Carefully place heater assembly into unit and align mounting holes.
(6)
insert bottom of each heater element into retaining clips.
(7)
(8)
Secure heater assembly with two screws, Iockwashers, and flat washers.
Install damp for heater wiring harness.
(9)