PS Magazine - TB 43-PS-741
PS, The Preventative Maintenance Monthly
ISSUE 741
AUGUST 2014
38
PS 741
AUG 14
39
PS 741
AUG 14
I
f the hardware for the handle and firing mechanism on the M224 and M224A1 mortars
isn’t torqued correctly, the mortars may not fire.
Here’s the correct torque:
± *M224:±
Tighten the self-locking screw and nuts to 10 + 2 lb-ft (13.6 + 2.7 N·m).
± *M224A1:
Torque the two new self-locking nuts to 10 + 2 lb-ft (13.6 + 2.7 N·m). Torque
the shoulder screw into the loop clamp to 12.5 + 2 lb-ft (17.0 + 2.7 N·m).
Make a note until this info is added to TM 9-1010-223-23&P and TM 9-1010-233-23&P.
And check out the complete scoop in TACOM maintenance information message 14-022:
I
t’s very easy to damage the AN/PED-5
laser target locator module’s external input/
output (I/O) cable.
If you jerk the 90-degree connector off
the laser target locator module I/O interface
connector, you damage both the cable and
the connection port.
Avoid that by pulling the connector
straight off with a slight rocking motion.
Easy
Does It
with I/O
Cable
± *
Torque references are industry standard.
M224,
M224A1
Mortar…
Get the Torque Right
M120/M121 Mortar System…
AN/PED-5 Laser Target
Locator Module…
Remove MSK Legs Only for Shipment
Easy
Does It
with I/O
Cable
M224
M224A1
Nut
Nut
Nut
Nut
Screw
Screw
Jerking out I/O
cable damages
cable and port
you just
RUiNEd
my
I/O cable
when you
Jerked it!
sorry. I can be Such A
jerk
sometimes.
O
uch!
Page 42 in
PS
7
34 (Jan 14) said
to
remove
the M120/M121 mortar
stowage kits (MSK) legs for
travel. This raised a couple of
questions
from readers…
No. Remove the
legs
only
when
the mortar is
being shipped.
in a tactical
environment,
leave the
legs on.
No plywood is
required for either
the baseplate or
bipod. The baseplate
should be emplaced
on the bare
ground following
the emplacement
procedure in the TM.
Should the
MSK legs be
removed when
you’re changing
locations in
a tactical
environment?
Should the
baseplate or bipod
be emplaced on a
piece of plywood
as shown in the
illustration?
Remove guide rail
legs
before
travel
WHY
WON’T
YOU
Fire?!
you
torqued
me
wrong!
my firing
mechanism
is
loose.
741 38-39.indd
1-2
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