TM 55-4920-227-15
the back cover plate to the control box and
(2) Inspect the tachometer indicator for a
remove the cover plate.
cracked or broken case or lens, damaged
(2) Tag and disconnect the leads of the cable
pointer, and illegible dial.
Replace if
(12, fig. 21) from the terminal block (11).
defective.
Remove the special nut inside the control
(3) Inspect the indicator light for broken lens,
box from the connector (13) and remove
damaged body threads, and for loose or
cable (12) from the control box (1).
corroded terminals. Replace if defective.
(3) Tag and disconnect the electrical leads from
(4) Inspect the pushbutton switches for cracked
the tachometer indicator (2), START-STOP
or broken case, catching or binding button
switch (7), RAISE-LOWER switch (14) and
action, and for damaged terminals. Replace
the indicator light (17).
if defective.
(4) Remove the two screws (9) and nuts (10)
c. Installation.
and remove the terminal block (11) from the
(1) Position the indicator light (17) on the front
control box.
of the control box (1) and secure the light to
(5) Remove the four screws (4) and nuts (3),
the rear of the box with the washer (19), and
and remove the tachometer indicator (2)
nut (18).
from the front of the control box.
(2) Place the START-STOP switch (7) on the
(6) Remove the two screws (5) from the front of
bracket (6) and secure with two screws (8).
the control box, and remove the bracket (6)
Position the switch and bracket in the control
with the START-STOP switch (7) from the
box and secure with two screws (5). Install
rear of the box. Remove two screws (8) and
the RAISE-LOWER switch (14) in a similar
separate the switch and bracket. Remove
manner.
the RAISE-LOWER switch (14) in the same
(3) Position the tachometer indicator (2) on the
manner.
front of the control box and secure with four
(7) Remove the hex nut (18) and washer (19)
screws (4) and nuts (3).
from the indicator light (17) and remove the
(4) Place the terminal block (11) inside the
indicator light from the front of the control
control box and secure with two screws (9)
panel.
and nuts (10).
(8) Remove two nuts (16) and screws (15) and
(5) Connect the electrical leads to the
remove the speed control nameplate from
tachometer indicator (2), START-STOP
the front of the control box. Remove the
switch (7), RAISE-LOWER switch (14), and
drive control nameplate in a similar manner.
indicator light (17).
b. Cleaning and Inspection.
(6) Insert the leads of the cable (12) through the
(1) Wipe the parts and the control box with a
opening in the side of the control box, install
cloth dampened with an approved cleaning
the special nut on the connector (13)
solvent.
securing the cable (12) to the box.
1
Control box
11
Terminal block
2
Tachometer indicator
12
Cable
3
Nut
13
Connector
4
Screw
14
RAISE-LOWER switch
5
Screw
15
Screw
7
START-STOP switch
16
Nut
8
Screw
17
Indicator light
9
Screw
18
Nut
10
Nut
19
Washer
Figure 21. Control box, rear view.
AGO 6729A
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