T-359 7–147.10.1 Replacing the Evaporator Fan AssemblyCAUTION!Always turn OFF the unit circuit breakers (CB-1 and CB-2) and disconnect main power supplybefore working on moving parts.a. Remove upper access panel (see Figure 3.2) by removing mounting bolts and TIR locking device. Reachinside of unit and remove the Ty-Rap securing the wire harness loop. Disconnect the connector by twistingto unlock and pulling to separate.b. Loosen four 1/4-20 clamp bolts that are located on the underside of the fan deck at the sides of the fanassembly. Slide the loosened clamps back from the fan assembly.c. Slide the fan assembly out from the unit and place on a sturdy work surface.7.10.2 Disassemble the Evaporator Fan Assemblya. Attach a spanner wrench to the two 1/4-20 holes located in the fan hub. Loosen the 5/8-18 shaft nut byholding the spanner wrench stationary and turning the 5/8-18 nut counter-clockwise (see Figure 7.8).b. Remove the spanner wrench. Use a universal wheel puller and remove the fan from the shaft. Removethe washers and key.c. Remove the four 1/4-20 x 3/4 long bolts that are located under the fan that support the motor and statorhousing. Remove the motor and plastic spacer.7.10.3 Assemble the Evaporator Fan Assemblya. Assemble the motor and plastic spacer onto the stator.NOTEWhen removing the black nylon evaporator fan blade, care must be taken to assure that the blade isnot damaged. In the past, it was a common practice to insert a screwdriver between the fan blades tokeep it from turning. This practice can no longer be used, as the blade is made up of a material thatwill be damaged. It is recommended that an impact wrench be used when removing the blade. Do notuse the impact wrench when reinstalling, as galling of the stainless steel shaft can occur.b. Apply Loctite to the 1/4-20 x 3/4 long bolts and torque to 0.81 mkg (70 inch-pounds).c. Place one 5/8 flat washer on the shoulder of the fan motor shaft. Insert the key in the keyway andlubricate the fan motor shaft and threads with a graphite-oil solution (such as Never-seez).d. Install the fan onto the motor shaft. Place one 5/8 flat washer with a 5/8-18 locknut onto the motor shaftand torque to 40 foot-pounds.
