OH.23 (Prior to Series D) Tail Rotor Complete Assembly Balance Check

TM 55-4920-201-14

4-46. OH.23 (Prior to Series D) Tail Rotor

fixture assembly (1) to seat all components firmly

Complete Assembly Balance Check. (See figure 4

together. Lock components in this position by

moderate and uniform tightening of lower fixture

a. Install sleeve (4), hub upward, on balancing

setscrews (8).

coupling

arbor (5) so that top of sleeve hub aligns with 7-

d. Install quick-disconnect

inch position on arbor scale (6). Lock sleeve in this

(7HEL053 or 7A050 kit) on arbor suspension

position by moderate and uniform tightening of two

coupler, and suspend entire assembly free of in-

sleeve setscrews (3), using 3 / 32-inch hex wrench

terference. Position pitch arm ball ends (if in-

stalled) against centers of slot ends; keep them

b. Insert lower end of arbor and pilot of sleeve

symmetrically positioned during balancing

(4) through hub splines of tail rotor assembly (2)

operation, and note the balance condition indicated

by black indicator disc at top end of the arbor.

insuring that sleeve hub seats firmly against rotor

e. For balance tolerance and application of

hub.

c. Install spacer (7) and fixture assembly (1),

balance corrections refer to applicable helicopter

recessed aide upward, over lower end of arbor.

manual. (Refer to appendix A).

Press downward on sleeve (4) and upward on

5. Balancing arbor (2516,

1. Fixture assembly (2532,

7HELO53 kit)

7HEL053 kit)

6. Arbor scale

2. Tail rotor assembly

7. Spacer (2534, 7HEL053

3. Sleeve setscrew

kit)

4. Sleeve (2329, 7HEL053

8. Lower fixture setscrews

kit)

Figure 4-27. Balancer Installation - OH-23 (Prior to Series D) Helicopter Tail

Rotor Complete Assembly.

4-45