TM 11-5855-250-12&P
b. If dirt is difficult to remove, use a damp cloth and
Sequence
ITEM TO BE INSPECTED
Work units
mild soap; flush with fresh water. Dry equipment
number
PROCEDURE
(T/H)
surfaces with a clean, lint-free cloth.
c. When the exterior surface contains only dust or
I. Mounts for dirt; clean if necessary.
2
SEARCHLIGHT
0.4
loose dirt, wipe it with a clean, lint-free cloth.
Perform an operational check by
d. Clean the front glass of the cowling assembly;
following start, standby, and stop
use a clean, lint-free cloth. If the dirt is difficult to
procedures. Place searchlight in all
remove, dampen the cloth with water; if necessary, use a
modes (including OVERDRIVE) of
mild soap.
operation; check for proper response.
If indicator lamp on CONTROL BOX
4-8. Operator's Troubleshooting
is defective, remove lens cap; turn it
Troubleshooting the searchlight by the operator is based
counterclockwise and replace lamp.
Replace lens cap.
Refer to
on the operational checks in the operator's weekly
preventive maintenance checks and services table (para
operation,
standby,
and
stop
4-6). To
troubleshoot the searchlight, perform the
procedures.
operational checks; report all abnormal symptoms to
3
MT-3900A/GSS-14(V)
0.1
higher category of maintenance personnel.
proper operation with no binding. Refer
4-9. Conversion for Travel
a. Tank-Mounted Searchlights.
Cover the
scale illumination switch to on.
If
azimuth and elevation lamps are not on,
searchlight with the cover assembly.
b. Mounted Searchlight. The following procedures
apply only on vehicle-mounted searchlights.
switch to on. If lamps are defective,
(1) Approximately level and direct the light so
remove lens cap; replace lamp. Inspect
that it will be pointed toward the rear of the vehicle.
for dirt; clean if necessary. Refer to
(2) Turn the elevation brake handwheel to
apply the elevation brake.
CAUTION
Do not use excessive pressure in
NOTE
tightening the brake.
Excessive
Refer to TM 11-2300-351-15-3 for
pressure is unnecessary and may
operator's preventive maintenance
damage the brake.
procedures for MT-3900/GSS-14(V).
(3) Turn the azimuth handwheel to align the
hole located on the place below the yoke and the
4-7. Cleaning
corresponding hole on the pedestal and insert the
Inspect the exterior of the searchlight subassembly,
azimuth lockpin.
control box, and mount. The exterior surfaces should be
(4) Set the azimuth engagement lever to the
clean and free from dirt and grease.
vertical (up) position to disengage the azimuth drive
WARNING
system.
Make sure that the searchlight is
(5) Cover the searchlight with the cover
turned off and cool before cleaning.
assembly.
a. Wash the exterior of the searchlight
NOTE
subassembly with a low-pressure hose or by using
Refer to TM 11-2300-351-15-3 for
buckets of fresh water. Dry equipment surfaces with a
conversion for travel procedures
clean, lint-free cloth.
covering mounted searchlights that
use the MT-3900/GSS-14(V).
Section III. ORGANIZATIONAL PREVENTIVE MAINTENANCE
a. Lint-free cloth (NSN 8305-00-170-5062).
4-10. Scope of Organizational Maintenance
b. Fresh water and mild soap.
a. The
maintenance
duties
assigned
to
organizational maintenance personnel are required
d. Lens tissue (NSN 5640-00-393-2090).
that must be accomplished once each month.
b. The duties assigned do not require special tools
4-12.
Organizational
Monthly
Preventive
or test equipment.
Maintenance Checks and Services
For organizational monthly preventive maintenance
4-11.
Materials Required for Organizational
Maintenance
4-2