PS Magazine - TB 43-PS-578

PS, The Preventative Maintenance Monthly

ISSUE 578

JANUARY 2001
PS Magazine - TB 43-PS-578 - Page 5 of 30
ome units are unsure where to find info on mounting the M66 machine gun
mount, NSN 1005-00-701-2810, on their trucks.
They don’t need to be. All the info on
kits and parts can be found in the vehicle’s
-20P TMs. Mounting instructions come with
each kit.
Here are the kit NSNs your direct sup-
port needs to mount the M66 on the most
common large trucks:
M939-series 5-ton
: mounting kit, NSN
1005-01-432-3339, and cab reinforcement
M44A2-series 2
1
/
2
-ton, M809-series 5-
ton
: mounting kit, NSN 1005-01-226-
4589, and cab reinforcement kit, NSN 2590-01-322-2694. (The M35A3
2
1
/
2
-ton truck already has a reinforced cab and just requires the mounting kit,
FMTV
: mounting and reinforcement kit, NSN 1005-01-381-5431
M977-series HEMTT
: mounting kit, NSN 2590-01-220-6377
Unless you install the reinforcement kit when you install the ring mount, the
weight of the mount will crack the cab. The only exceptions are the HEMTT and
M35A3, which don’t need the reinforcement kit.
After the kits are installed, unit-level maintenance can replace most parts by
using the NSNs in the -20Ps.
M939-Series Trucks . . .
Part
NSN
Bracket assembly
Ring spacer
Ring spacer
Connecting link
(M939/A1 kit only)
Connecting link
(M939A2 kit only)
Straight pin
Cotter pin
Cotter pin
Plain hex nut (2)
Straight pin
Rod end clevis (2)
Machine bolt (2)
Trucks . . .
Brace here means kit was installed
i saved
a lot of time
by
not
reinforcing
your cab when i
installed the
ring mount!
and gave
me a
headache
to boot!
acking your M939-series 5-ton
truck with the transfer gearcase in low
range will crack the gearcase.
Drivers are warned about this prob-
lem in the -10 TM and every time
they get behind the wheel by a warn-
ing plate on the dash. Unfortunately,
some drivers don’t pay attention.
Units can now prevent this costly
mistake by installing a lockout kit that
will not let the driver put the trans-
mission into reverse if the transfer is
in low range.
If you own a basic M939-series or
M939A1-series vehicle, use kit, NSN
2520-01-473-2742. M939A2-series
vehicles need kit, NSN 2520-01-473-
2744.
save
your truck's
transfer gearcase by
installing a
lockout kit
on your transmission.
here's
what you'll
get in the
kits
.
7
PS 578
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