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Page Title:
CHAPTER 4. AVIATION INTERMEDIATE MAINTENANCE |
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 TM 55-4920-415-13&P
CHAPTER 4.
AVIATION INTERMEDIATE MAINTENANCE
SECTION I. PREPARATION FOR MAINTENANCE STORAGE AND SHIPMENT
4-3. Preparation of Unit for Shipment .
Refer to
4-2. Preparation of Unit for Maintenance Storage.
Refer to paragraph 3-2, chapter 3.
SECTION II. CHECKOUT AND ANALYSIS
a. The Daily Services listed in Table 3-2 of
b. Follow the operational checkout of paragraph
application of power.
SECTION III. REPAIR PROCEDURES
4-4. Drive Motor Control Unit.
(4) Pull by hand on slip clutch housing to
remove.
a. Removal
b. Replacement.
(1) Rest the gyro tester on its back supporting
(1) Position slip clutch and secure with four
the drive motor weight with suitable
machine screws.
blocks.
(2) Tighten two set screws.
(2) Remove bottom panel (122, Figure 3-1).
(3) New unit should resist one pound of force
(3) Tag and disconnect the electrical wires
applied at end of fork using tension gage
from control unit (99, Figure 3-1).
before beginning to slip.
(4) Remove three machine screws holding
control unit.
4-6. Drive Motor.
a. Removal.
b. Replacement
(1) Remove slip clutch
by
referring
to
(1) Position control unit and secure with three
machine screws.
(2) Lift up by hand on fork assembly
(2) Replace electrical leads.
removing it from drive motor shaft. Be
(3) Position bottom panel and secure with
careful in setting fork assembly down on
machine screws and leveler pads.
bench not to strike slip ring against any
hard object.
(4) Refer to Section IV, paragraph 4-9, for
alignment.
(3) Tag and disconnect vibrator motor power
leads at brushes.
4-5. Slip Clutch.
(4) Release cradle index knob (17, Figure
a. Removal.
position.
(1) Release cradle index knob (17, Figure 1-1
and rotate cradle to vertical position.
(5) Remove four 3/8-18 thread machine
screws (76, Figure 3-1) at motor base.
(2) Loosen two 10-32 thread set screws
securing slip clutch (45, Figure 3-1) on
(6) Place the failed and replacement drive
drive motor shaft.
motors on their backs to prevent the
leakage of lubricant while transferring the
(3) Remove four machine screws 46 securing
dust cover (58, Figure 3-1).
slip clutch to fork.
4-1
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