(5). Gently lower the azimuth tube through the roof until it is supported on the Yoke and Base by the
shaft housing. Re-install the two 5/16" bolts and fasten the shaft housing to the Yoke and Base.
(6). At the operator's station, determine the desired height for the Mechanical Control. Determine
how long the azimuth tube should be and cut to desired length using a metal hacksaw. Deburr the cut
end of the azimuth tube using a file or coarse emery cloth and slide the ceiling mount over the tube and
upward toward the ceiling. Temporarily tighten the friction clamp knob (if installed).
(7). At the Yoke and Base, lightly lubricate the elevation rod with 30W non-detergent oil, align and
insert the end of the elevation rod with the cross-drilled hole into the shaft housing, and carefully feed the
rod through the oil seal and azimuth tube down through the roof.
(8). At the operator's station, position the elevation rod into the shaft seat of the Mechanical Control
handle assembly and install the roll pin (1/8” X 5/8") provided. "Squeeze" force rather than "hammer"
force is preferable (see Detail, Drawing 9304-1).
(9). Gently push the pinned elevation rod and Mechanical Control handle assembly upward until the
azimuth tube seat properly engages the azimuth tube. Clamp the Mechanical Control handle assembly to
the azimuth tube (see Detail, Drawing 9304-1).
(10). At the Yoke and Base, use a hacksaw and cut off the protruding elevation rod leaving approxi-
mately 3.0" of elevation rod exposed above the top of the shaft housing. Deburr this cut.
(11). Install the spur gear provided on the elevation rod with the gear hub down. DO NOT install the
roll pin at this time.
(12). At the operator's station, TEST and verify that the Yoke and Base rotates smoothly when the
Mechanical Control handle assembly is rotated and that the spur gear/elevation rod rotates freely when
the Mechanical Control handle assembly grip is twisted.
Remove the Searchlight Head components from their shipping containers and inspect for damage. If
undamaged, place these components near the installed Yoke and Base.
(13). At the Yoke and Base, install the bushings provided into the trunnion holes of the arms of the
Yoke and Base. Place the shoulder bolts (3/4-10 X 2.5") into the bushings in preparation for engaging the
Searchlight Head bosses (see Detail, Drawing 9304-1).
(14). Lift the Searchlight Head into position between the arms of the Yoke and Base (window facing
forward), install the optional washers if desired between the Searchlight Head bosses and the arms of the
Yoke and Base, and engage/tighten the mounting bolts such that the Searchlight Head swings smoothly in
the trunnions.
(15). Tilt the Searchlight Head (window up) and install the rack support and rack assembly to the bot-
tom of the Searchlight Head as shown in Drawing 9304-1. Tighten (finger-tight) rack mounting hardware
to allow for final positioning when the rack engages the spur gear.
(16). Tilt the Searchlight Head to engage the spur gear with the rack assembly and adjust the rack
support and spur gear height until the spur gear teeth mesh smoothly and fully with the rack assembly
teeth for all rack positions. Tighten the rack support mounting hardware.
(17). Hold the spur gear at the correct height, drill a 1/8" hole in the elevation rod using the cross-
drilled spur gear hub hole as a pilot, and insert the roll pin (1/8” X 1") provided. "Squeeze" force rather
than "hammer" force is preferable when installing the pin (see Detail, Drawing 9304-1).
11
Summary of Contents for 9304
Page 2: ......