TM 55-4920-221-14
KEY to figure 16 (Cont)
41.
Flat washer (124 rqr)
18. Screw, cap, hex-hd, 1/4-20 x 1/2 in.
42.
Link
19. Nut
43.
Link (8 rqr)
20. Support rheostat angle
44.
Link (3 rqr)
21. Screw, cap, hex-hd, 1/4-20 x 1/2 in. (6 rqr)
45.
Nut, hex, jam, brass, 3/8-16 (97 rqr)
22. Nut
46.
Stud, threaded, 3/816 x 2 7/8 in. lg. (31 rqr)
23. Rheostat support angle brace
47.
Bus bar (2 rqr)
24. Impedor box support angle brace
48.
Washer (3,1 rqr)
25. Screw
49.
Nameplate
26. Nut
50.
Push-on nut
27. Impedor box support angle
51.
Connection board
28. Screw
52.
Screw (6 rqr)
29. Nut
53.
Nut, plain, hex, 1/4-20 (6 rqr)
30. Relay-200 amp, 24 volts dc coil
54.
Angle (2 rqr)
31. Inverter relay support bracket
55.
Screw (4 rqr)
32. Insulating strip
56.
Nut (4 rqr)
33. Screw, cap, hex-hd, 1/4-20 x 1/2 in. (6 rqr)
57.
Pin guide (2 rqr)
34. Nut
58.
Nut (2 rqr)
35. Rod
59.
Angle (2 rqr)
36. Nut (4 rqr)
60.
Screw (2 rqr)
37. Brace
61.
Nut (2 rqr)
38. Screw
62.
Switch plate
39. Nut
63.
Ac-dc switch
40. Nut, wing 3/816 (31 rqr)
Figure 16-Continued.
Section IV. LOAD RACK, REAR CABINET, AND FRONT PANEL ASSEMBLIES
142. GENERAL.
(4) Install other motor and bracket in a similar
manner.
The load rack, located inside rear cabinet, contains
resistors of different values, selected to form balanced
loads for testing equipment under actual load conditions.
144. LOAD RACK ASSEMBLY.
Two motors with fans mounted below the load rack,
a. Removal.
provide cooling of resistors, while thermostats provide a
(1) Remove 16 screws (3, figure 17) and nuts
cutout or shutdown protection in case of overheating.
(4) securing top (1) to rear cabinet.
(2) Remove two screws (2) and nuts (4)
143. MOTORS AND FANS.
securing top to angle and remove top.
a. Removal.
(3) Remove 15 screws (14), harness support
(1) Remove four capscrews (25, figure 17)
rod bracket (13), and 15 nuts (15) securing load rack
lockwashers, and nuts (26) securing bracket (24) to front
baffles (12) to load rack assembly (5).
channel (37) and rear channel (36). Remove motor and
(4) Remove six screws (9), washers (10), and
bracket.
nuts (11) securing front millboard (8) to load rack and
(2) Remove four capscrews (21), lockwashers
remove millboard.
(22), and nuts (23) securing motor (20) to bracket and
(5) Remove two screws (17) and nuts (18)
remove motor and fan blade.
securing load rack assembly (5) to two load rack braces
(3) Remove fan blade (19) from motor.
(16).
(4) Remove other motor and bracket in a
(6) Remove load rack by removing four
similar manner.
capscrews (6) and nuts (7) securing load rack to front
b. Installation.
channel (37) and to rear channel (36).
(1) Install fan blade (19) on motor (20).
b. Disassembly.
(2) Attach motor on bracket (24) with four
(1) Remove millboard (12, figure 18) by
capscrews (21), lockwashers (22), and nuts (23).
removing six screws (13), lockwashers (14), and nuts
(15) securing rear millboard to baffle mounting brackets
(3) Attach bracket on channels (36 and 37)
(27) and terminal block mounting brackets (28). Baffle
with four capscrews (25) and nuts (26).
51
