Model 53C51 with Dome Assembly

TM 55-4920-201-14

Key to figure 4-6:

5. Arbor scale

1. Dome assembly

6. Rear cone set screw

7. Front cone (7A050 kit)

2. Propeller assembly

3. Rear cone (7A050 kit)

8. Spacers (7A050 kit) as required

4. Balancing arbor (2259,

9. Screw plug (2435, 7A052 kit)

7A050 kit)

10. Bushings (7A050 kit) as required

4-18. Model 53C51 with Dome Assembly. (See

l. Install "quickie" coupling (11, figure 1-13)

figure 4-6).

of alternate hoist eye assembly (12) on end ball of

3 / 16-inch suspension cable (13) and quick-

NOTE

disconnect coupling (10) assembly. Engage

Assembly shall not include dome cap, oil

coupling eye with suitable shop hoist. Install quick-

transfer tube, low pitch stop assembly, or

disconnect coupling on arbor suspension rod.

pitch lock assembly.

m. Hoist entire assembly approximately

inch off blade shank supports. Check to insure that

a. Arrange three auxiliary supports (saw

the suspended assembly is free from interference

horses or equivalent) for blade shanks of propeller

with blade shank supports and other objects, and

assembly (2) on floor under suitable shop hoist.

note the balance condition indicated by the black

indicator disc at the top end of the arbor.

b. Place propeller assembly, rear side of

propeller upward, on blade shank supports so that

n. For balance tolerance and application of

both upper and lower surfaces of propeller hub are

balance corrections, refer to applicable aircraft

accessible.

maintenance manual.

c. Remove dome assembly (1) from propeller

4-19. Model 53C51 Spinner assembly (See figure

hub.

1-12, typical).

d. Instill rear cone (3), part no. 2228 (7A050

kit), hub upward, on balancing arbor (4) so that

NOTE

upper surface of cone hub aligns with 20-inch

Since this spinner assembly cannot be

position on arbor scale (5).

accommodated on the 7A050 work stand

and hoist assembly, the larger half of the

NOTE

7A050 case assembly, on the floor with its

The 20-inch position is 1 inch above upper

felt tray upward, is suggested as a con-

end of etched scale.

venient resting place for the spinner

assembly during installation and removal

e. Lock rear cone (3) securely in this position

of the balancing adapters. Use of available

by tightening rear cone setscrew (6) with 1/8 inch

standard shop hoist rather than the 7A050

hex wrench.

hoist, is recommended in this instance for

suspension of the balancing assembly.

f. Install arbor downward through propeller

hub, seating rear cone (3, figure 4-6) in rear cone

a. Install part no. 2582 adapter (7A055 kit)

seat.

hub upward, on lower end of part no. 2259

g. Install front cone (7), part no. 2208

balancing arbor (7A050 kit) so that top surface of

(7A050 kit), hub downward, over lower end of

its hub aligns with the 1 inch position on arbor

arbor. Hold in position.

scale. Lock adapter in this position on arbor with

h. Install bushing, part no. 2210 (7A050 kit),

adapter set screw, using 1/8 inch hex wrench

and bushing, part no. 2211 (7A050 kit), over lower

(7A050, 7A055 kits).

end of arbor. Do not lock bushing setscrews. Hold

b. Holding spinner front nut with commercial

bushings in position.

inch socket wrench (not supplied), screw part

i. Install the following spacers (8) in

no. 2582 adapter all the way into spinner front nut

sequence over lower end of arbor: Part no. 2202,

until flange of the adapter bottoms firmly on

If nece-

2203, and 2204 (7A050 kit).

spinner front support. Do not overtighten.

ssary, additional spacer part no. 2201,

c. Install part no. 2227 and 2228 cones

may be used.

(7A050 kit) over top end of arbor and seat them

j. Install screw plug (9) in lower end of arbor,

firmly against hub of 2582 adapter. These cones

and tighten plug to clamp cones firmly into

serve as counterweights to properly position the

propeller cone seats.

center of gravity of the balancing assembly.

k. Install dome assembly (1) over lower end

of balancing arbor, and secure dome temporarily by

hand tightening of dome retaining nut.

Change 3

4-11