TM 55-4920-221-14
contact blades (9 and 10).
(3) Remove other pilot light assembly in a
similar manner.
(3) Remove two contact blades (9 and 10) in
a similar manner.
(4) Remove toggle switch (7) from rear of
panel by removing knurled thumb nut and special hex
(4) Remove brackets (7) from rear of
nut.
mounting pad by removing two rivets (13) from each of
two brackets.
(5) Remove terminal block (8) from rear of
the panel (12) by removing two screws (9), lockwashers
(5) Remove two rivets (13) from each of two
(10), and nuts (11).
clips (11).
c. Cleaning, Inspection, and Repair.
(6) Remove bar from front of mounting pad,
and two clips (11) from rear of pad by removing two
(1) Clean parts with cloth dampened in dry
screws (5) and lockwashers (6) from bar (4).
cleaning solvent, P-D-680 and dry thoroughly.
(7) Remove clip (3) from bar (4) by removing
(2) Visually inspect resistors and capacitors
screw (5) and lockwasher (6).
for cracks, breaks, indications of discoloration or burned
condition, and damaged terminal leads.
(8) Remove bracket (12) from rear of
mounting pad by removing two rivets (13).
(3) Inspect light assembly for stripped
threads, damaged terminals and cracked or broken lens.
c. Cleaning and Inspection.
(4) Inspect switch for cracked or damaged
(1) Clean parts with dry cleaning solvent P-D-
case, weak or broken spring, stripped threads and
680 and dry thoroughly.
damaged terminals.
(2) Inspect contact blades, clips, and brackets
(5) Inspect other parts for damage and
for cracks, breaks, or distorted condition, and replace
unserviceable condition: '.
parts as necessary.
(6) Repair damaged threads by chasing when
(3) Inspect threaded parts for stripped or
practical.
damaged threads and replace as necessary.
d. Reassembly.
d. Reassembly.
(1) Attach terminal block (8, figure 14)
(1) Attach bracket (12) on mounting pad (14)
on rear of panel (12) with two screws (9), lockwashers
with two rivets (13).
(10), and nuts (11).
(2) Attach two clips (11) on rear of mounting
(2) Attach toggle switch (7) on rear of
pad (14) with two rivets (13).
panel with special nut and knurled thumb nut.
(3) Attach bar (4) on ends of clip (11)
(3) Attach pilot light assembly (6) on
protruding from front of panel, with two screws (5) and
front panel, using special flat washer and hex nut.
lockwashers (6).
(4) Install, and connect leads of six
(4) Install clip (3) on bar (4) with remaining
resistors (1, 2, and 3), and leads of four capacitors (4
screw (5) and lockwasher (6).
and 5).
(5) Install two brackets (7) on rear of
e. Installation.
mounting pad with two rivets (13).
(1) Attach phase sequence indicator (54,
(6) Attach two contact blades (8) on rear of
mounting pad with rivet (13).
(2) Connect leads to terminals of phase
(7) Install contact blades (9 and 10) in a
sequence indicator.
similar manner.
(8) Install seven binding posts (1) on front of
126. VOLTAGE REGULATOR MOUNTING PAD.
mounting pad with nut (2).
a. Removal.
e. Installation.
(1) Tag and disconnect leads from terminals
(1) Attach voltage regulator mounting pad (:
on voltage regulator mounting pad (57, figure 12).
57, figure 12) on front of control panel with four screws
(2) Remove voltage regulator mounting pad
(58) and nuts (519).
(57) from front of control panel by removing four nuts
(2) Connect leads to terminals of voltage
(59) and screws (58).
regulator mounting pad.
b. Disassembly.
127. RESISTORS.
(1) Remove binding posts (1, figure 15) from
front of mounting pad (14) by removing nut (2) from
a. Removal.
each of the seven binding posts.
(1) Tag and disconnect leads from terminals
(2) Remove contact blade (8) from rear of
on resistors (36, 37, and 40, figure 12).
mounting pad by separating rivet (13) from each of two
43
