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Page Title:
OH-23 Main Rotor Head and Control Rotor Assembly Balance Check |
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 TM 55-4920-201-14
4-49. OH-23 Main Rotor Head and Control Rotor
Assembly Balance Check. (See figure 4-30.)
fixture enters inside diameter of hub splined
trunnion. Make certain that base of rotor hub seats
a. Center fixture (1) on stand table assembly
squarely on base of fixture.
(1, figure 1-13).
b. Carefully lower rotor assembly (2, figure 4-
NOTE
Rotor forks must be locked in symmetrical
that upper diameter of fixture enters inside
position, using arm assembly, blade
diameter of hub splined trunnion. Make certain
leveling, FSN 4920-509-5193. Refer to
that base of rotor hub seats squarely on base of
applicable helicopter manual. (Refer to
fixture.
NOTE
d. Install balancing arbor (3) downward
Rotor forks must be locked in symmetrical
through fixture pilot hole.
positions, using arm assemblies, blade
e. Install 3 / 16-inch suspension cable (13,
leveling, FSN 4920-509-5193. Refer to
applicable helicopter manual (Refer to
assembly on suspension rod at top end of arbor, and
engage suspension cable in lifting plate of hydraulic
pump assembly.
c. Install balancing arbor (3) downward
through fixture pilot hole.
f. Adjust suspended height of arbor so that top
surface of fixture (1, figure 4-30) aligns with arbor
d. Install 3 / 16-inch suspension cable (13,
scale (4) as follows:
assembly on suspension rod at top end of arbor, and
(1) Wood-blade rotor assemblies- 11--
engage suspension cable in lifting plate of hydraulic
inch position.
pump assembly.
(2) Metal-blade rotor assemblies-9--
inch position.
e. Adjust suspended height of arbor so that
14--inch position on arbor scale (4, figure 4-30)
g. Install spacers (5) on bottom end of arbor
aligns with top surface of fixture (1).
as follows :
f. Install spacers (5), part no. 2202 and 2203
(1) Wood-blade rotor assemblies-part
(7A050 kit), on bottom end of arbor.
no. 2203 (7A050 kit).
g. Install hand wheel (26, figure 1-13) in
(2) Metal-blade rotor assemblies-part
bottom end of arbor, and tighten wheel to seat
no. 2201 (7A050 kit).
spacers (5, figure 4-30) under base of fixture (1).
h. Install hand wheel (26, figure 1-13) in
Check to insure that sensitivity setting specified in
bottom end of arbor, and tighten wheel to seat
step e has been maintained.
spacer (5, figure 4-30) under base of fixture (1).
h. Hoist entire assembly approximately -
Check to insure that sensitivity setting specified in
inch off work stand. Check to insure that
step f has been maintained.
suspended assembly is free from interference with
i. Hoist entire assembly approximately
work stand and other objects, and note the balance
inch off work stand. Check to insure that
condition indicated by black indicator disc at top
suspended assembly is free from interference with
end of the arbor.
work stand and other objects, and note the balance
condition indicated by black indicator disc at top
i. For balance tolerance and application of
balance corrections, refer to applicable helicopter
end of arbor.
manual. (Refer to appendix A.)
NOTE
4-50. OH-23 Main Rotor Head and Blade
Assembly Balance Check. (See figure 4-30).
The span of the rotor blades makes it
essential that this balance check be per-
a. Assemble the hoist support structure as
formed in a draft-free area and that the
shown in figure 3-3 except use part no. 2769 tube
movement of personnel in the area be held
assembly to provide the additional vertical arm
to a minimum.
height in place of the no. 4 vertical tube (part no.
2288) supplied in the 7A050 kit.
i. For balance tolerance and application of
b. Center fixture (1) on stand table assembly
balance corrections, refer to applicable helicopter
(1, figure 1-13).
manual (Refer to appendix A).
c. Carefully lower rotor assembly (2, figure 4-
4-50
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