OH-58 Series Main Rotor Hub and Blade Assemblies Balance Check

TM 55-4920-201-14

Key

to figure 4-21:

Stand table (7A050 kit)

Fixture assembly (2532, 7HEL053 kit)

Bar pair (11 sets) 2940 through 2950 (7HEL065 kit or AA4020-8508 kit)

Post assembly (2) (2080, 7HEL065 kit or AA4920-8508 kit)

Tail rotor hub and blade assembly

Plate (2586, procure)

Bushing (2533, 7HEL053 kit)

Balancing arbor (2516, 7HEL053 kit)

Arbor scale

10.

Bushing ret screw

Il.

Pilot bushing (2529, 7HEL053 kit)

12.

Lower fixture set screw

13.

Port thread

14.

Movable index action

15.

Index pin and set screw

16.

Tail rotor attaching nuts

17.

Tail rotor attaching bolts

VIEW A

VIEW B

Figure 4-22. UH-1 and AH-1G Series

Tail Rotor Yoke Configurations

Identification for Proper Arbor Sensitivity Setting.

4-40. OH-58 Series Main Rotor Hub and Blade

lightly tighten ring nut (5) securing hub clamp

Assemblies Balance Check. (See figure 4-23).

section (6) of locks and adjust blades to ap-

proximately flat pitch with the arm positioing ring

a. Assemble the 7A050 kit work stand and

nuts (7). Remove rotor assembly from the

hoist support structure, substituting pert no. 2769

helicopter.

tube assembly in place of the part no. 2288 tube

assembly to provide the additional vertical height

e. Carefully install the rotor assembly on the

required for this application.

adapter (3) mounted on fixture (2), engaging

trunnion bore over pilot diameter of adapter and

b. Place the fixture (2) centrally on the work

seating firmly on cone surface.

stand (1).

f. Remove centrifugal tilt stop assembly from

c. Lower the adapter (3), large end down, over

rotors incorporating this mechanism.

the top extension of the fixture (2).

g. Observe oil level In grip and trunnion oil

d. Install pitch positioning locks (4) on the

reservoir sight glasses. Fill as required in ac-

rotor assembly between the pitch arms and hub

cordance with applicable helicopter maintenance

lower flange while the rotor is still mounted on the

manual.

helicopter mast. Refer to view A of figure 4-23, and

4-36

Change 6