PS Magazine - TB 43-PS-682
PS, The Preventative Maintenance Monthly
ISSUE 682
SEPTEMBER 2009
8
PS 682
SEP 09
9
PS 682
SEP 09
T
he starter protection relay, NSN 5945-01-291-0734, used in M109 howitzers and
ammo carriers doesn’t hold up very well, mechanics.
And that can be a real problem. The relays are coded as terminal items, so you can
no longer get one.
Fortunately, the low-heat rejection (LHR) engine, which was introduced after the
current relay was already in use, is much better at starting in cold temperatures.
Unfortunately, that means the battery and starter protection features of the relay are
no longer worth the additional cost.
The current relay can
now be
replaced
with
a much simpler starter
relay, NSN 5945-00-690-
2707. You can’t just swap
the two relays, though.
You’ll
need
to
make
some
modi±cations
to
your vehicle during the
replacement.
You’ll ±nd instructions starting on Pages 181 and 191 of TB 43-0001-62-08-4
(Feb 09). If you need a copy, write to Half-Mast:
half.mast@us.army.mil
c
rewmen, track is expensive. So the last thing you want to do is replace usable track.
Unfortunately, that’s just what’s happening on some M113-series vehicles.
The problem is some bad T150 track wear gauges, NSN 5220-01-496-3692, got
into the system. The inner dimension on these gauges is too small. Because the
gauge is inaccurate, perfectly good track is being rated as unserviceable and units are
spending valuable dollars to replace it.
So inspect all of your T150 track gauges right now. The suspect gauges will be
inscribed with part number 12474849. If a gauge measures between 3
15
/
32
and 3
1
/
2
inches, it’s good. Any gauge that measures 3
3
/
8
inches or less is scrap metal.
If you ±nd a bad gauge, use it as a template to measure the rest of the gauges in
your unit. Just make sure you identify the gauge as bad by scribing or painting it.
Check out the full story in TACOM Maintenance Advisory Message 08-052:
Good gauge
Bad gauge
3
15
/
32
“ to 3
1
/
2
“
3
3
/
8
“ or less
M109-Series SP Howitzer, M992A2 Ammo Carrier…
Relaying Some Replacement Info
Old starter protection relay can be replaced
my paladin needs
a new starter
protection relay!
another
relay went
out?
Double-check Track gauges
The difference between
a good and bad gauge
is
very
small, so you’ll
have to be
careful
in
your measurements.
whadaya mean
I need
new
track?!
my old track
still has plenty of
miles left on it!
M113-Series FOV…
not according
to the track
wear gauge!
maybe he
oughta check
the accuracy of
that gauge!
682.08-09.indd
1-2
8/3/09
2:55:00 PM
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