TM 9-4120-411-14
4.47 INSIDE BLOWER REPLACEMENT.
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
Tools
Materials/Parts
General Mechanics Tool Kit
Lock Washer
Item 1, Section III, Appendix B
Item 14, Appendix G
WARNING
Rotating parts and lethal voltage levels are used in operating the FDECU. Be sure
power source is disconnected. Injury or death can occur if connected to power
source.
(1) Shutdown the FDECU per paragraph 2.4 and disconnect it from power source.
(2) If duct is attached, remove per paragraph 4.57.
(3) Turn flange assembly (1) to unlock then remove it. Be sure filter (2) and, if applicable, return cover (3) are
kept in flange assembly.
(4) Remove inlet bell (4).
(5) Remove jam nut (5), lock washer (6), flat washer (7), inside blower (8), and key (9). Discard lock washer.
b. Installation. See figure 4-46.
(1) Install key (9), and inside blower (8). Secure with flat washer (7), new lock washer (6), and jam nut (5).
Torque jam nut to 40 ft lb.
(2) Install inlet bell (4). Spin inside blower (8) by hand and check that it spins freely and does not rub on inlet
bell.
CAUTION
Return cover will obstruct air flow if installed in flange assembly during operation.
Equipment damage can result if operated with return cover installed in flange
assembly.
(3) Install flange assembly (1) in either direction as necessary, with filter (2), and if applicable, return cover (3) in
place. Turn flange assembly to lock in place.
(4) Install supply panel per paragraph 4.25.
(5) Install duct if necessary per paragraph 4.4.6.
(6) Connect FDECU to power source and operate per paragraph 2.4.
4-112 Change 1
