PS Magazine - TB 43-PS-628
PS, The Preventative Maintenance Monthly
ISSUE 628
MARCH 2005
Dear Editor,
If any mortar firing pin becomes immoveable due to PM neglect, the
tube can end up condemned. That recently happened here at Ft. Drum
when we had to condemn a 60mm tube because its firing pin had gone
so long without cleaning that it had frozen with corrosion and carbon.
A new tube isn't cheap.
Just doing the quarterly PMCS called for in each mortar's -23 TM
will keep firing pins moving. PMCS directs that the firing pin, firing pin
guide, and firing pin hole be inspected and then cleaned with RBC
quarterly. If you fire your mortars
frequently, then you should be
servicing the firing pin more
often than quarterly.
Don't let your mortars sit neglected for months
in the arms room. They deserve better.
Robert Foley
TACOM Logistics Assistance Representative
Ft. Drum, NY
Dear Sergeant M.P.,
The TM does come up short on mounting brack info. Here's what you need for
mounting the M121:
Order the lever release bracket with
NSN 5340-01-285-0619. To mount the
lever release bracket, you'll need a lock
washer, NSN 5310-00-584-5272, and
hex head screw, NSN 5305-00-071-2071.
Order the lower mounting bracket
with NSN 5340-01-286-0470. To mount
it, you'll need a lock washer, NSN 5310-
00-584-5272; flat washer, NSN 5310-00-
184-8992; and hex head screw, NSN
There are no repair parts for the lower mounting bracket, but there are for the
lever release bracket:
•
locking pin assembly, NSN 5315-01-386-3977
•
manual lever, NSN 5340-01-285-0135, which includes a flat washer, NSN 5310-
01-292-7760; locking washer, NSN 5310-01-285-0128; and locking nut, NSN
•
non-metallic bumper, NSN 5340-01-285-7512, which includes spacer plate,
NSN 5365-01-292-7763; flat washer, NSN 5310-01-285-0123; and hex socket
screw, NSN 5305-01-285-0116
The angle bracket for the lever release bracket is not
available. You will need to order the next higher assembly,
the rim latch, NSN 5340-01-285-0619.
PS 628
MAR 05
23
Mortars…
PS 628
MAR 05
22
M121 Mortar Carrier…
Dear MSG Half-Mast,
I need info on mounting the M121
120mm mortar to the side of the
M1064 mortar carrier. I can't find
anything in TM 9-2350-277-24P
on the mounting bracket.
SSG M. P.
Lever
release
mount
bracket
Mounting
bracket
Mortar base
thanks, half-mast.
we were having
real trouble
finding a carrier
bracket for me.
it’s
no
use!
I just
can’t seem
to move my
firing pin.
now I may
need a
new pin!!
Mounting
the 120mm
Mortar
Editor's note
:
Good advice, Robert.
Let's keep those
mortar firing pins
moving, armorers.
Firing Pin Needs to Move
At least quarterly, take tube apart
and clean firing pin with RBC
628.22-23(C)
1/27/05
5:51 PM
Page 1
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