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TM 750-116
(2) Late Production (fig. 3-28).
Figure 3-28 M42 Tank Periscope - Late Production
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 5 psig for 5 minutes.
(c) Charge instrument at 1 psig for 10 seconds.
(d)
Leak test for minimum of 5 minutes.
(3) Modified Production (fig. 3-29). Refer to
para 3-10.h.(2) above for procedures.
Figure 3-29 M42 Tank Periscope - Modified
Production
i.
Periscope, M44A Tank (figs. 3-30 through
3-32.
ENSURE THAT THE VEHICLE MASTER
SWITCH AND THE PERISCOPE EMER-
GENCY SWITCH ARE IN THE OFF POSI-
TION. THE HIGH VOLTAGE AND LOW
AMPERAGE OF THE POWER PACK IS
NOT DANGEROUS; HOWEVER, IF THE
HIGH VOLTAGE PARTS ARE TAM-
PERED WITH, AN ELECTRICAL SHOCK
MAY RESULT.
Do not expose periscope to bright light; pro-
longed exposure may cause damage to image
conversion tube.
NOTE
Special plate assemblies are provided for purg-
ing and charging when the head assembly and
body assembly are separated. These plates are
also used for shipment and storage of the peri-
scope.
(1) Purging and Charging in the Installed Posi-
tion (fig. 3-30).
Figure 3-30 M44A Series Tank Periscope
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 5 psig for 10 minutes.
(c) Charge instrument at 1 psig for 20 seconds.
(d) Leak test for minimum of 5 minutes.
3-13
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