PS Magazine - TB 43-PS-612

PS, The Preventative Maintenance Monthly

ISSUE 612

NOVEMBER 2003
PS Magazine - TB 43-PS-612 - Page 4 of 33
PS 612
NOV 03
4
The M939-series 5-ton does
not
use the M66 ring mount. If your MTOE author-
izes the M66 for the M939, LIN M74364, it's wrong. The M66 will damage the cab
structure of the M939. The M939 uses the machine gun mount kit, NSN 1005-01-
432-3339, a four-post lightweight weapon station. To mount the lightweight weapon
station, you
must
install the cab reinforcement kit, NSN 2590-01-436-9144.
The only mounts that can be used
with the
lightweight
weapon station
are the MK64 Mod 9, NSN 1010-01-
412-3159, or the MK93 Mod 1, NSN
1005-01-383-2757. The only weapons
safety-certified to date for the M939
are the MK 19, M2, and M60 machine
guns.
It's important to use a catch bag with
the mounts to prevent spent casings
and links from falling into the cab.
See Fig 620 in TM 9-2320-272-24P
for info on the M939 truck ring mount.
The MK64 mount is covered by TM
9-1010-231-23&P and MK93 Mod 1
by TM 9-1005-245-13&P.
The M66 mount is covered by TM 9-1005-245-13&P, which contains M66 part
replacements.
After any of the kits are installed, unit-level maintenance can replace
most parts by using the NSNs in the -20Ps.
M939 Truck
5
HMMWV…
N
ice, straight fins are what your HMMWV needs for the oil cooler to work right.
Bent fins stop air flow through the oil cooler and radiator, overheating the engine
and transmission.
The fins get bent because mechanics lean or crawl onto the oil cooler when they
pull engine PM or adjust belt tension.
2' 7 3/4"
2-21/2"
2' 10"
1 1/2"
3"
3' 4"
6"
2'
PLYWOOD
NO STEP
Make the shield out
of 3/4-in plywood
using the following
dimensions…
You can put a stop
to fin damage by
using an oil cooler
shield to protect
the fins.
you’re not
getting under
my hood with-
out using an
oil cooler fin
shield!
I use a
lightweight
weapon
station
only.
Use only MK64
or MK93 mounts
on lightweight
weapon station
No M66 ring
mount for me.
That's much
too heavy.
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