Quantcast OH-58 Series Tail Rotor Hub and Blade Assemblies Balance Check

 

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Figure 4-23. Balancer Installation - OH-58 Series Main Rotor Hub and Blade Assemblies (Typical).
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TM-55-4920-201-14 Balancing and Adapter Kits (MARVEL) Manual
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Figure 4-24. Balancer Installation - OH-58 Series Tail Rotor Hub and Blade Assemblies (Typical)
TM 55-4920-201-14
6.
Clamp section, 3035 lock
7.
Ring nut, 3035 lock
8.
Bushing (2777, 7HEL069
1. Stand table (7A050)
2. Fixture (2337, 7HEL054)
Yoke (2780, 7HEL069)
9.
3. Adapter (2775,
10.
Arbor (2259, 7A050)
7HEL069)
11.
Set screws, 2780 yoke
12.
Set screw, 2777 bushing
4. Lock (3035, 7HEL069)
(2)
13.
Handwheel (2215,
5. Ring nut. 3035 Lock
7A050)
4-41. OH-58 Series Tail Rotor Hub and Blade
h. Install arbor, with bushing, downward
Assemblies Balance Check. (See figure 4-24.)
thru plate on rotor hub, adapter and fixture. Seat
tightly against plate and rotor hub. Tighten 2 lower
a. Assemble 7A050 work stand and hoist
support structure as shown in figure 3-3.
set screws 19) of fixture hub evenly to maintain
clamping  pressure.
b. Place fixture (2), recessed side downward,
centrally on work stand table (1).
i. Position rotor assembly and adjust blade
pitch to locate pitch horn studs ( 10) adjacent to
c. Assemble spacer (13) to threaded end of
post assemblies (3) below their indexing pin sec-
two post assemblies (3). Install assembled units
tions (12). Rotate upper section (11) of posts to
into tapped holes A, view A, of fixture (2). Use
position knurled length of index pin (12) above
fingers only to tighten.
pitch horn studs. Readjust pitch of blades to seat
d. Place adapter (4), large end downward,
studs upward against extending index pin knurled
over hub extension of fixture (2).
section, see view B, of figure 4-24.
e. Position tail rotor assembly to place static
j. Attach 2266 quick disconnect coupling
stop (machined) surface of yoke section upward
with 2264 cable (7A050 kit) to 2516 arbor.
and index to locate trunnion bearing restrictions
Engage cable ball into lifting plate of stand hoist.
adjacent to flat sides of adapter. Engage trunnion
k. Hoist assembly approximately inch
bore with pilot diameter and install to seat upon
above stand table; stabilize movements, and ob-
adapter shoulder (4).
serve balance indicated by black disc in top surface
f. Place plate (5) centrally (accessory part
of arbor shaft. Check to insure balance indications
P / N 2586 may be substituted) on top surface of
are not affected by interferences from the stand, air
rotor hub.
drafts or movement of nearby personnel.
g. Install bushing (6) on arbor (7) with its
l. For balance tolerances, method of
flanged end downward. Position to align its top
correction and other assembly requirements, refer
surface (sensitivity setting reference) with the 8--
to applicable helicopter maintenance manual.
inch arbor scale location for rotors incorporating
flyweight ring type pitch horns or 9--inch location
for non-weighted horns. Secure by tightening the
two bushing set screws (8) evenly.
Change 6 4-39

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