Balancing Hartzell Flange-mounted Turbo. (cont)

TM 55-4920-201-14

Insert wedges consistently from leading edge sides

adapter (3) and plate (14) until hub of bushing (8)

of blades to insure symmetrical distribution of

comes to rest at bottom of prop cylinder.

weight, and tap wedges lightly to make certain

f. Install spacer (2) over bottom end of arbor,

that play in blade bearings is forced radially out-

nsuring that top of spacer passes through slot in

ward.

plate (15), to contact plate (14). Install handwheel

(1) in bottom of arbor and tighten to clamp

j. Hoist balancing assembly approximately 1/4

balancing assembly together.

inch off plate (15) and remove plate (15) from

stand table. Check to insure balancing assembly is

g. Install plate hub upward, over top end of

suspended free of interference with stand or ad-

arbor. Align plate pitch positioning pins, as ap-

jacent objects. Observe balance indication at top of

plicable, with propeller blade pitch arms, and

arbor.

secure plate temporarily by inserting propeller

pitch arm link screws through plate pins and pitch

NOTE

arms.

Re-install plate (15) on stand table before

h. Position blade pitch in desired range, and

lowering balancing assembly onto stand.

lock plate on arbor by tightening plate set screw

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

k. For balance tolerance and installation of

i. Install wedges (6, figure 4-11) between

balance corrections, refer to applicable propeller

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

manual.

4-18

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