OH-23 (Series D, F, And G) Tail Rotor Complete Assembly Balance Check

TM 55-4920-201-14

4-48. OH-23 (Series D, F, And G) Tail Rotor

sleeve setscrews (5), using 3 / 32-inch hex wrench

Complete Assembly Balance Check. (See figure 4-

e. Insert lower end of arbor downward through

NOTE

rotor hub splines, spacer (3, figure 4-29) and

fixture assembly (2), pressing all components

The following procedure may be used in

firmly together. Lock components in this position

cases where selective matching of used or

required rotor blades with new replacement

by moderate and uniform tightening of two lower

blade is required. For prior balancing of

fixture setscrews (9), using 3 / 32-inch hex wrench

rotor hub and yoke assembly only, refer to

f. Install quick-disconnect coupling

a. Set fixture assembly (2), recessed aide up on

(7HEL053 or 7A050 kit) on arbor suspension

suitable auxiliary support block (1).

coupler, and suspend entire assembly free of in-

b. Place spacer (3) central on top of fixutre

terference. Position rotor pitch arm ball ends

assembly (2) hub.

vertically downward and keep them symmetrically

c. Set tail rotor assembly (4) approximately

positioned during balance checks, and note the

central on fixture assembly.

balance condition indicated by black indicator disc

d. Install sleeve (6), hub downward, on

at top end of the arbor.

balancing arbor (7), aligning top of sleeve with 8-

g. For balance tolerance and application of

inch position on arbor scale (8). Lock sleeve in this

balance corrections, refer to applicable helicopter

position by moderate and uniform tightening of two

manual. (Refer to appendix A.)

4-48