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TM 750-116
c. M17A1, M17B1C, and M17C, (figs. 3-44
through 3-46).
NOTE
Rangefinder end housings are purged and
charged on a yearly basis; however, they must
be visually inspected every 90 days.
Figure 3-44 M17A1 Body Assembly
(1)
(a)
2-5.a.
(b)
(c)
(d)
Body Assembly (fig. 3-44)
Perform purging and charging procedure para
Purge instrument at 8 psig for 30 minutes.
Ensure relief valve closes at 5 psig.
Leak test for a minimum of 5 minutes.
(2) End Housing Assemblies (figs. 3-45 and
3-46).
NOTE
Blister and splatter shields must be removed for
end housing assembly purging and charging
procedures.
Some end housings have a relief valve instead
of an outlet screw. When there is a relief valve,
disregard the procedure that removes the outlet
screw.
Purging pressure for end housings with relief
valves must be increased to 8 psig to open the
relief valve and keep it open during purging.
Charging pressure for housings with relief
valves is the 5 psig at which the relief valve
seats.
Figure 3-45 M17A1 and M17C End Assembly
(a) Remove inlet port cap and outlet screw with pre-
formed packing attached.
(b)
2-5.b.
(c)
(d)
(e)
Perform purging and charging procedure para
Purge instrument at 5 psig for 5 minutes.
Charge instrument at 1 psig for 10 seconds.
Leak test for minimum of 5 minutes.
3-20
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