PS Magazine - TB 43-PS-684

PS, The Preventative Maintenance Monthly

ISSUE 684

NOVEMBER 2009
PS Magazine - TB 43-PS-684 - Page 11 of 33
19
PS 684
NOV 09
V
ehicle downtime, not to mention a big repair bill, is what happens when the
5-tonner is backed up with the transfer gear case in low range. Backing up in low
range causes the gear case to crack—and that’s unreparable damage!
Drivers—listen up! This
is an on-going problem
that doesn’t seem to be
going away. First, read the
-10 TM about backing up
in reverse. Second, there’s
a warning plate on the
dash when you get behind
the wheel.
O
perators, when you need to add some fluid to your HMMWV’s power steering
reservoir, keep your cool and watch where you put that wrench.
You may be tempted to ±t it to the
upper nut on the reservoir’s ±ll plug.
Unfortunately, that’s where the vent
tube attaches to the plug. A wrench
applied there can snap the connection
between the tube and plug.
Instead, get a bigger wrench and
use it on the lower portion of the ±ller
plug. With the tube out of the way, you
can get the job done with a minimum
of muss and fuss—and no damage.
Unfortunately, some eager-beaver drivers are in
a hurry when they hop in the cab and don’t realize
what’s happened until the damage is done.
Now here’s the good news.
Units can prevent this costly crack up by
installing a lockout kit that won’t let the driver put
the transmission into reverse if the transfer is in
low range.
If you drive a basic M939-series or M939A1-
series truck, have your mechanic install kit, NSN
2520-01-473-2742, PN 57K3622. M939A2-series
trucks need kit, NSN 2520-01-473-2744, PN
57K3623.
PN
NSN
Part
Bracket assembly
Ring spacer
Ring spacer
Connecting link (M939A1 kit only)
Connecting link (M939A2 kit only)
Straight pin
Cotter pin
Cotter pin
Plain hex nut (2)
Straight pin
Rod end clevis
Machine bolt (2)
12379841
12379846-1
12379846-2
12379847
12379848
MS20392-7C113
MS24665-287
MS24665-355
MS35691-38
MS35810-6
MS35812-11
B1821BH050C150L
M939-Series
Trucks…
CraCk Up
in Reverse!
M1113,
M1114
HMMWVs…
Don’t Vent when Removing Fill Plug
Wrench in wrong place will snap off vent line
Heed warning plate on dash
darn it!
I broke
the power steering
reservoir vent line!
hey!
what
was that
noise?
yeow…
my aching
transfer
case!
here’s
what
comes
with the
kits…
684.18-19.indd
1-2
10/1/09
4:46:49 PM
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