HARTZELL PROPELLERS.

TM 55-4920-201-14

d. Install part no. 2753 adapter (7A055 kit),

downward through propeller shaft nut and adapter,

hub downward over top end of arbor and push

seating rear bushing (4) on propeller shaft nut.

downward until its grooved ring engages the circle

e. Install part no. 2223 rear cone (11), hub

of positioning dowels in the rear face of the spinner

downward, over lower end of arbor. Hold in place.

assembly. Insure the adapter is firmly bottomed on

f. Install part no. 2203 spacer (12). Hold

the dowel screws.

spacers and cone.

e. Install 2266 quick-disconnect coupling

g. Install hand wheel (13) in lower end of

(7A050 kit) with 2264 cable (7A050 kit) on arbor

arbor, and tighten wheel to clamp rear cone (11)

suspension rod. Couple 2261 eye assembly to end

firmly into propeller cone seat.

ball of cable assembly using 2260-1 "quickie"

coupling (7A050 kit). Engage hoist eye with shop

h. Install plate (9), hub upward, over top end

hoist and suspend entire assembly free of in-

of arbor. Align plate pitch positioning pins, as

terference. Note balance indication at top of arbor.

applicable, with propeller blade pitch arms, and

secure plate temporarily by inserting propeller

f. For balance tolerances and application of

pitch arm link screws through plate pins and

balance corrections, refer to applicable propeller

propeller pitch arms.

maintenance handbook. (Refer to appendix A).

4-20. HARTZELL PROPELLERS.

i. Position blade pitch in desired range, and

lock plate (9) on arbor by tightening plate setscrew

4-21. Models HC83X20, HC93Z20, - Piston and

with 1/8-inch hex wrench (8, figure 1-13).

Feathering Spring Removed. (See figure 4-10).

j. Install wedges (3, figure 4-10) between

a. Center propeller assembly (1), with front

propeller hub and blade butts. (See figure 4-7).

cylinder upward, on stand table assembly (1, figure

Insert wedges consistently from leading edge aider

1-13).

of blades to insure symmetrical distribution of

weight, and tap wedges lightly to make certain that

b. Engage installing tool (7) in part no. 2453

play in blade bearings is taken up in a radially

adapter (2) as shown in figure 4-10. Insert adapter

outward direction.

upward through bottom of propeller hub, and

screw threaded end firmly into propeller shaft nut.

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

Disengage and remove installing tool from adapter.

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

C. Install rear bushing (4), knurled hub up-

assembly on suepension rod at top end of arbor, and

ward, on balancing arbor (8) so that top surface

engage suspension cable in lifting plate of hydraulic

of bushing aligns with the 13 inch position on

pump assembly.

arbor scale (6) when balancing the HC93Z20

l. Hoist entire assembly approximately

propeller, or the 13-3/4 inch position on arbor

inch off work stand. Check to insure that the

scale (8) when balancing the HC83X20 propeller.

suspended assembly is free from interference with

Lock bushing securely in this position

work stand and other objects, and note balance

by tightening bushing setscrew (5) with

condition indicated by the black indicator disc at

1/8 inch hex wrench (8, figure 1-13).

the top end of the arbor.

d. Install balancing arbor (8, figure 4-10)

Change 1

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