SX-16 Nightsun
®
Searchlight System
Maintenance Manual
Document 031734-1/Revision A
031734-1 Revision B
January 27, 2014
o
Examine the condition of the motor wires and the rubber boots. If the insulation on
the wires is cracked or appears to be near the end of its useful service life, replace it.
Similarly, the boots should be soft and pliable.
•
Remove the existing Gimbal arm:
o
Remove the lock wire from the side of the 1-1/8” hex nut that attaches the Gimbal
arm to the Azimuth Gearbox shaft.
o
Remove the 1-1/8” hex nut. It may require 100 foot-pounds of torque to loosen it.
o
Do not remove the Azimuth stop blocks from the Azimuth ring.
o
Remove the Azimuth Gearbox from the Gimbal arm. If the shaft does not come out of
the arm easily, use a gear puller or arbor press.
o
Examine the arm bearing and the spacer on the side opposite the elevation Gearbox.
If the bearing is smooth and the spacer’s center hole is not worn out, they can be
reused. If they are going to be reused, gently press them out of the old arm with an
arbor press and a large-diameter socket wrench or die.
o
Remove the ¼-20 shoulder bolt and its associated hardware (washers, locking nut,
etc.).
4.12 Procedure for Old Azimuth Stop Configuration
This procedure applies to the old Azimuth stop configuration, which was replaced with the
introduction of the new configuration in August 2004.
To remove the existing Gimbal arm:
•
Remove the Searchlight from the existing Gimbal.
•
Prepare to remove the existing Gimbal arm:
o
Observe the orientation of the Azimuth (upper) Gearbox to aircraft mounting. Make
pencil marks so that you can install the Gearbox to the same position relative to the
new Gimbal arm when it is reinstalled.
o
Note the orientation of the drive motor with respect to the Gimbal arm so that it can
be installed in the same position with the new Gimbal arm.
o
Observe the routing of the cables, service loops, and the position of the cable ties so
that you can replicate them later.
o
Remove any cable ties that hold the Gimbal motor wires in place, and again take
note of their location.
o
Examine the Azimuth motion limit stop Roll Pins. One of them sticks up from the top
of the Gimbal arm; two of them stick out from the underside of the Azimuth Gearbox.
o
Make sure that there is no more than 2° of backlash on the elevation Gearbox and on
the Azimuth Gearbox. If either Gearbox has more than 2° of backlash, adjust or
repair the Gearbox before installing them on the new Gimbal arm.
o
Examine the condition of the motor wires and the rubber boots. If the insulation on
the wires is cracked or appears to be near the end of its useful service life, replace it.
Similarly, the boots should be soft and pliable.
•
Remove the existing Gimbal arm:
o
Remove the lock wire from the side of the 1-1/8” hex nut that attaches the Gimbal
arm to the Azimuth Gearbox shaft.
o
Remove the 1-1/8” hex nut. It may require up to 100 foot-pounds of torque to loosen
it.
o
Remove the Azimuth Gearbox from the Gimbal arm. If the shaft does not come out of
the arm easily, use a gear puller or arbor press.
o
Examine the arm bearing and the spacer on the side opposite the elevation Gearbox.
If the bearing is smooth and the spacer’s center hole is not worn out, they can be
reused. If they are going to be reused, gently press them out of the old arm with an
arbor press and a large-diameter socket wrench or die.
Source: Spectrolab, Inc.
23
The document reference is online, please check the correspondence between the online documentation and the printed version.
