how much this trembling can be minimized, let
u. Check the tightness of both the worm taper
the motor run with no worm in the motor shaft
screw and the gear-collar setscrew. Lubricate with
while feeling with the fingers on top of the motor
a thin film of Grease, Aircraft and Instruments
(GL) on the worm and gear.
q. Stop the motor. Place the transceiver in the
v. Replace the spanner wrench and the gearbox
SET RANGE position. In this position, the field
cover and replace the Allen setscrew wrench in its
coils of the motor will offer enough resistance to
rotation of the motor shaft to permit the worm,
when the taper screw is sufficiently loosened, to
be rotated without, rotating the motor shaft.
Loosen the taper screw, using the Allen and span-
a. Primary Clutch. The primary clutch tension
should be 12 to 14 ounces. Make a dynamic
r. Slightly rotate tile worm in the motor shaft
measurement with the motor running and the
and retighten the taper screw.
drum held stationary by means of a string wrapped
s. Start the motor and, once again, feel the
around the drum and attached to the scale (fig.
primary clutch tension, stop the
whether the trembling has increased or decreased.
motor and loosen the clamp screw (G, figs. 115
t. Repeat the procedures in r and s above; al-
and 116). The spring retainer (F) can be pushed
ways rotate the worm slightly in the same direc-
tion until little or no trembling is felt.
TT-1/TXC-l, serial numbers 1 through 90; in