C 14, TM 9-2350-230-12
Section 11-3. SIGHTING AND FIRE CONTROL
(2) Open escape port of the unit to be
purged (except on the receiver-transmitter) by removing
the plug screw. The receiver-transmitter has a relief
a. This
section
contains organizational
valve and does not require removal of a plug screw. The
maintenance instructions for the sighting and fire control
relief valve will pop open when a pressure greater than 4
components. Refer to table 11-5 for figure references to
psi is applied to it.
maintenance of all components on the M551. See
paragraph 11-5 for instructions for purging the laser
(3) Using the appropriate adapter, attach one
range finder units on the M551A1.
the other end to the fill valve or entrance port.
synchronization of XM)44 series periscope and linkage,
(4) Turn the tank valve on the nitrogen
using an outdoor method.
cylinder counterclockwise to open.
c. Refer to TMs 9-2350-23010/2-1 and 9-2350-
(5) Set the pressure regulator to 7 psi +2
230-10-2-3 for boresighting procedures on all sighting
and fire control instruments on the M551 and M551A1,
(6) Open control valve on the purging adapter
respectively.
kit to allow nitrogen to flow through the unit for
approximately 10 minutes for all units except the
11-5. Purging Laser Range Finder Units (M551A1
Only)
receiver-transmitter for 30 minutes.
(7) Close the control valve on the purging
a. Laser range finder units must be purged with dry
kit.
(8) Remove the purging adapter kit from
moisture.
the laser range finder unit.
b. Use purging adapter kit supplied for the M551
(9) Immediately reinstall valve cap (at fill
series vehicles.
valve) on receiver-transmitter; on other units, install plug
c. The fill valve (or entrance port) on each unit is
screws at entrance and escape ports.
color-coded gray; the relief valve (or escape port), yellow.
d. Purge the laser range finder units as follows:
(1) Remove the fill valve cap or plug screw
from the unit fill valve (or entrance port).
11-28