Figure 4-37. Balancer Installation - CH-34 Helicopter Tail Rotor Hub and Blade Assembly

TM 55-4920-201-14

wedges (8, figure 4-37), symmetrically spaced

tightening bushing setscrew (5) with 1/8-inch hex

across blade centerline, into each blade hinge. (See

view at A.) Seat wedges firmly by pressing with

d. To facilitate rotor hub and plate alignment,

thumb.

raise rotor blade grips off plate support blocks.

Insert lower end of balancing arbor (6, figure 4-37)

h. Install 3 / 16-inch suspension cable (13,

figure 1-13) and quick-disconnect coupling (10)

downward through tail rotor hub and blade

assembly on suspension rod at top end of arbor, and

assembly (3) and plate assembly hub, pushing

engage suspension cable in lifting plate of hydraulic

downward until lower end of bushing (4), rotor

pump assembly.

hub, and plate hub are seated firmly together.

i. Hoist entire assembly approximately 1/4 inch

Reposition rotor blade grips central on plate

off work stand. Check to insure that suspended

support blocks.

assembly is free from interference with work stand

e. Install spacers (9) over lower end of arbor.

and other objects and note the balance condition

f. Install hand wheel (26, figure 1-13) in

bottom end of arbor, and tighten to clamp assembly

indicated by black indicator disc at top end of the

firmly together.

arbor.

g. Using rawhide or rubber mallet, tap

j. For balance tolerance and application of

shoulder of each blade hinge, adjacent to square

balance corrections, refer to applicable helicopter

head of hinge bolt, so as to position blade chordwise

manual. (Refer to appendix A).

in direction of its trailing edge. Then insert two

Figure 4-37. Balancer Installation - CH-34 Helicopter Tail Rotor Hub and Blade

Assembly.

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