Operating instructions

TM 11574A-OI
3-25
2
Replacing Heat Exchanger. This maintenance procedure does not exist in the
commercial manual. It is to be developed at a later date.
(12) Evaporator Fan and Motor Assembly
NOTE
The evaporator fans circulate air throughout the container by pulling air in the top of the
unit. The air is forced through the evaporator coil where it is either heated or cooled and
then discharged out the bottom of the refrigeration unit into the container. The fan motor
bearings are factory lubricated and do not require additional grease.
(a) Replacing the Evaporator Fan Assembly. To remove the evaporator fan assembly,
perform the following:
WARNING
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power
supply before working on moving parts.
1
Remove access panel (Figure 2-2) by removing mounting bolts and T.I.R. locking
device. Reach inside of unit and remove the Ty-wrap securing the wire harness loop.
Unplug the connector by twisting to unlock and pulling to separate.
2
Loosen four 1/4-20 clamp bolts that are located on the underside of the fan deck at
the sides of the of the fan assembly. Slide the loosened clamps back from the fan
assembly.
3
Slide the fan assembly out from the unit and place on a sturdy work surface.
(b) Disassemble the Evaporator Fan Assembly. To disassemble the evaporator fan
assembly, perform the following steps:
1
Attach a spanner wrench to the two 1/4-20 holes located in the fan hub. Loosen the
5/8-18 shaft nut by holding the spanner wrench stationary and turning the 5/8-18 nut
counter-clockwise (Figure 3-12).
2
Remove the spanner wrench. Use a universal wheel puller and remove the fan from
the shaft. Remove the washers and key.
3
Remove the four 1/4-20 x 3/4 long bolts that are located under the fan that support
the motor and stator housing. Remove the motor and plastic spacer.
(c) Assemble the Evaporator Fan Assembly. To assemble the evaporator fan assembly,
perform the following steps:
1
Assemble the motor and plastic spacer onto the stator.
2
Apply loctite to the 1/4-20 x 3/4 long bolts and torque to 70 inch pounds.
3
Place one 5/8 flat washer on the shoulder of the fan motor shaft. Insert the key in the
keyway and lubricate the fan motor shaft and threads with a graphite-oil solution.
4
Install the fan onto the motor shaft. Place one 5/8 flat washer with a 5/8-18 locknut
onto the motor shaft and torque to 40 foot-pounds.