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 TM 55-4920-415-13&P
(3) Connect the electrical leads.
b. Replacement
(4) Secure motor enclosure in place using four
(1) Position the drive motor on the cradle and
hex nuts.
secure it with the four machine screws.
(5) Refer to Section IV, paragraph 4-10 for
(2) Connect electrical leads.
alignment.
(3) Release cradle index knob and rotate cradle
4-8. Dirty Slip Ring.
to vertical position.
a. Removal.
(4) Slide fork assembly down over drive motor
shaft being careful not to strike slip ring
(1) Remove slip
clutch
by
referring
to
against end of shaft.
(5) Replace slip clutch by referring to paragraph
(2) Lift up by hand on fork assembly removing
it from drive motor shaft. Be careful in
setting fork assembly down on bench not to
(6) Refer to Section IV, paragraph 4-9 for
strike slip ring against hard object.
alignment.
(3) Clean slip ring (54, Figure 3-1) with a cloth
4-7. Vibrator Motor.
moistened in an approved cleaning
a. Removal.
solvent.
(1) Release cradle knob and rotate cradle to
(4) An alternate is to replace the slip ring if
horizontal position.
found
damaged
by
tagging
and
disconnecting leads and removing four
(2) Release motor enclosure (21, Figure 3-1) by
screws.
removing four hex nuts.
b. Replacement
(3) Tag and disconnect the electrical wires from
motor.
(1) Replace slip ring by reconnecting leads
and securing it with four machine screws.
(4) Detach motor (23) from enclosure by
removing four machine screws (25, Figure
(2) Replace fork assembly on drive motor
shaft being careful not to strike slip ring on
end of shaft.
(5) Release vibrator weight (26, Figure 3-1)
from motor shaft by loosening set screw.
(3) Replace slip clutch
by
referring
to
b. Replacement
(4) Refer to Section IV, paragraph 4-10 for
(1) Secure vibrator weight on motor shaft .25
alignment.
inches from motor housing.
(2) Replace motor in the enclosure by using
four machine screws.
SECTION IV. ALIGNMENT
15 and 20 degrees per second utilizing
4-9. Check on Rotational Rates.
potentiometers (20, 19).
a. Set up gyro tester (per paragraph 2-13).
4-10. Check on Vibration Level.
b. Operate unit with rotational rate switch in the 10
degrees per second position and check rotational
a. Set up gyro tester per paragraph 2-13.
speed with stopwatch. The corresponding time
should agree within 2 percent of nominal. If the
b. Place rotational rate switch in 10 degrees per
time does not agree, perform the following steps.
second position.
(1) Loosen shaft lock-nut on potentiometer (21,
c. Move dive-climb switch lever from center
position to either side to initiate rotation of fork
assembly.
(2) Adjust potentiometer with screw driver until
time for one revolution of fork is within
d. Place vibrator motor switch in "ON" position and
desired tolerance.
feel by hand for vibration of base and cradle.
(3) Secure shaft by tightening lock-nut.
e. Make sure vibration is present during entire time
for one complete rotation of fork assembly.
(4) Repeat steps (a) and (b) for rotational rates
4-2
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