PS Magazine - TB 43-PS-611

PS, The Preventative Maintenance Monthly

ISSUE 611

OCTOBER 2003
PS Magazine - TB 43-PS-611 - Page 5 of 33
Suppose you’re replacing a bad regulator that happens to be one of the internally
grounded ones. You order a new one expecting to receive the same type, but instead
get one that requires an external ground strap. Since there are no installation instruc-
tions or ground strap included in the package, you have no idea that it’s any differ-
ent from the one being replaced. So, you install it just like the one you removed.
You’ve now got an ungrounded regulator that’s going to burn up.
TACOM’s fix is a
requirement that
all
new
regulators be installed
with an external ground
strap.
The
external
ground strap won’t hurt
internally-grounded regu-
lators and is essential for
externally grounded ones.
Attach the ground
strap, NSN 6150-00-999-
2100, to the regulator
with lock washer, NSN
nut, NSN 5310-00-761-
6882. The other end of
the strap connects to the
regulator mounting plate
with two lock washers,
and screw, NSN 5305-00-
068-7837.
PS 611
OCT 03
7
M113-Series FOV…
Regulator
Needs a Strap
here’s
something
for you
m88a1
and avlb
mechanics!
yeow!
have you
been walking
on carpet!?
no, you just
forgot
to
ground my new
regulator.
M88A1/AVLB
Idler Seal
U
se NSN 5330-01-407-9045 to order a new
compensating idler arm seal for your M88A1
recovery vehicle and M60A1 AVLB. The
NSN listed for Item 29 in Fig 195 of TM 9-
2350-256-24P-1 and Item 36 in Fig 175 of
TM 5-5420-202-24P is no longer available.
M
echanics, there are two different types of 200-amp regulators for M113-series
vehicles. One has a built-in internal ground and the other requires an external
ground strap.
Both regulators come under NSN 2920-01-300-3737 and that’s where the prob-
lem begins.
Regulator,
Ground strap,
Lock washer,
Screw,
Nut,
Lock washer,
Lock washer,
Mounting plate
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