TM 3-4240-334-20&P
TM 3-4240-334-20&P
TM 3-4240-334-20&P
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<strong>TM</strong> 3-<strong>4240</strong>-<strong>334</strong>-20&P<br />
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M43A1 (CONT)<br />
Item<br />
No.<br />
Interval<br />
Item to<br />
Check/Service<br />
Procedure<br />
Not Fully Mission<br />
Capable If:<br />
4<br />
Semi-<br />
Annual<br />
OUTLET VALVE<br />
ASSEMBLY AND<br />
OUTLET VALVE<br />
COVER<br />
a.<br />
Lift outlet valve cover (1) by<br />
pulling tab on bottom of cover<br />
out and up.<br />
WARNING<br />
Do not use facepiece assembly<br />
if valve disk (2) is missing<br />
or damaged. The facepiece<br />
assembly will leak.<br />
b.<br />
c.<br />
d.<br />
e.<br />
Check that outlet valve disk (2)<br />
is present and is not curled or<br />
distorted. Rotate outlet valve<br />
disk to make sure it is not<br />
sticking.<br />
WARNING<br />
Do not use paper to remove<br />
dirt or moisture from outlet<br />
valve cover or outlet valve<br />
disk. Paper may break up<br />
and lodge in outlet valve<br />
causing valve to leak.<br />
Check outlet valve seat (3) for<br />
dirt.<br />
Check outlet valve disk (2) for<br />
nicks, tears, or rips. Wipe off<br />
any moisture from valve disk<br />
with a soft, clean cloth (Item 8,<br />
App D). Smooth disk with your<br />
finger so that it lies flat on outlet<br />
valve seat.<br />
Check outlet valve cover (1) for<br />
breaks, cracks, and missing<br />
hinge pin (4) or retaining ring<br />
(5).<br />
Valve disk is missing, distorted,<br />
or sticking.<br />
Outlet valve seat is dirty.<br />
Outlet valve disk is nicked, torn,<br />
or ripped; cannot be cleaned,<br />
or will not seat properly.<br />
Outlet cover is broken or<br />
cracked. Hinge pin or retaining<br />
ring is missing.<br />
2-20
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