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TM 55-4920-201-14
7. Arbor (2516, 7HEL053)
8. Set screws, 2533 bushing
9. Set screws, 2533 fixture
1. Stand table (7A050)
hub
2. Fixture (2532, 7HEL053)
10. Studs, pitch horn
3. Post assembly (2) (2539,
11. Section, upper, 2539 post
7HEL053)
12. Indexing pin, 2539 post
4. Adapter  (30771,
13. Spacer
(2)
(3063,
7HEL069)
7HEL069)
5. Plate (2531, 7HEL053 or
2586 (Accessory part)
6.  Bushing (2533,
7HEL053)
4.42. FAIRCHILD HILLER HELICOPTERS.
e. Insert lower end of balancing arbor (9,
figure 4-25) in open end of coupling (11), bot-
4-43. OH-23 Helicopter.
toming arbor against coupling internal stop pins
4-44. OH-23 Engine Fan Assemblies Balance
(5). Lock arbor securely in this position by
Check. (See figure 4-25).
moderate and uniform tightening of two upper cou-
a. Select applicable extension pilot plug as
pling setscrews (6), using 3 / 32-inch hex wrench.
follows:  use extension pilot plug (1) for fan
f. Install counterweight (10, figure 4-25), hub
assemblies prior to OH-23 series D (view A); use
upward, over upper end of arbor assembly. Position
extension pilot plug (13) for OH-23 series D, F,
counterweight so that top surface of hub aligns on
and G fan assemblies (view B).
arbor scale (8) as follows:
b. Assemble applicable extension pilot plug
(1) OH-23 fan assemblies prior to series
in coupling (11) against coupling internal stop pine
D-10-inch  position.
(5) as shown. Secure plug with two lower coupling
(2) OH-23 fan assemblies series D, F,
setscrews (4), using 3 / 32-inch hex wrench (2,
and G-10-inch position.
g. Lock counterweight in this position by
c. Insert extension pilot plug through hub of
moderate and uniform tightening of two coun-
engine fan assembly (3, figure 4-25) from flat side
terweight setscrew (7), using 3 / 32-inch hex
of fan assembly.
wrench (2, figure 1-8).
d. Install collar (12) over projecting end of
h.  Install  quick-disconnect  coupling
extension pilot plug as follows: for fan assemblies
(7HEL053 or 7A050 kit) on arbor suspension
prior to OH-23 series D, install collar with flat end
coupler, and suspend entire assembly free of in-
toward fan assembly (view A); for OH-23 series D,
terference. Note balance condition indicated by
F, and G fan assemblies, install collar with cone
black indicator disc at top of arbor.
end toward fan assembly (view B). Seat collar and
extension pilot plug firmly against sides of fan
i. For balance tolerance and application of
assembly hub, and lock in position with collar
balance corrections, refer to applicable helicopter
setscrew (2), using 3 / 32-inch hex wrench (2,
manual. (Refer to appendix A.)
4-41

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