Figure 4-33. Balancer Installation - UH-19 Helicopter Tail Rotor Hub and Blade Assembly - 105-inch-diameter Configuration with Movable Counterweights.

TM 55-4920-201-14

(8), using 3 / 32-inch hex wrench (2, figure 1-18).

b. Insert sleeve (9, figure 4-33) into tail rotor

counterweight support spacer, and install spacer

e. Push pitch control bracket bolts, part no.

between rotor hub trunnion and bottom surface of

AN-4-21A, radially outward with heads seated

counterweight support.

against blade pitch brackets. Insure that these bolts

c. Carefully lower tail rotor hub and flange

remain in this position throughout balancing

assembly (3), spacer, and counterweigh: support

operation.

over arbor and adapter piloting hub. Align blades

f. Install quick-disconnect coupling

with adapter support blocks (2), and insure that

(7HEL053 or 7A050 kit) on arbor suspension

weight of rotor assembly rests squarely on support

coupler, and suspend entire assembly free from

blocks.

interference, and note the balance condition in-

dicated by black indicator disc at top end of the

d. Install bushing (5) over arbor and adapter

arbor.

hub. Press tapered pilot on this bushing lightly into

upper counterbore of counterweight support, and

g. For balance tolerance and application of

lock bushing securely in this position by moderate

balance corrections, refer to applicable helicopter

and uniform tightening of two bushing setscrews

manual. (Refer to appendix A).

1. Adapter assembly (2522,

4 . Adapter setcrew

7. Arbor scale

7HEL053 kit)

8. Bushing setscrew

5. Bushing (2355, 7HEL053

2. Adapter support block

kit)

9. Sleeve (2356, 7HEL053

3. Tail rotor hub and blade

kit)

6. Balancing arbor (2516,

assembly

7HELO53 kit)

Figure 4-33. Balancer Installation - UH-19 Helicopter Tail Rotor Hub and Blade

Assembly - 105-inch-diameter Configuration with Movable Counterweights.

4-54