PS Magazine - TB 43-PS-584

PS, The Preventative Maintenance Monthly

ISSUE 584

JULY 2001
PS Magazine - TB 43-PS-584 - Page 25 of 32
PS 584
JUL 01
46
M157-Series Smoke Generator.
..
We Want
to
Pump
You Up!
A
fog oil pump that can't pump will surely stop an M157 from smoking.
So, if you
don't keep the pump pumped with PM, you and your M157 will soon be going cold
turkey.
Most M157s sit for long periods without use. That lets corrosion form in the fog
oil pumps and lock them up. If your M157 is going to sit for more than 20 days, run
light oil—like 15W—through the two pumps like this:
1.
Disconnect the fog oil
pump supply and return
hoses and stick them in
the 15W oil container.
That keeps 15W oil from
getting mixed up with
fog oil in the fog oil tank.
Put supply and
return hoses in
oil can
Flip up
bypass
switch
2.
Remove the M157's equipment
container right side panel and put
the FOG OIL bypass switch in the
up position. Turn on the control
panel and flip the FOG OIL switch
to RUN. You do not need to turn on
the FUEL or ENGINE switches.
3.
Run the pump for 2-5 minutes. Reconnect the supply and return hoses. Do the
same procedure with the other pump. The oil protects the pumps from corrosion for
20 days. If you're still not smoking after 20 days, repeat the procedure.
If,
despite your best
efforts, a fog oil pump
seizes in the field, don't try
to free the pump by tapping
it. That knocks corrosion
loose that can score and
ruin the insides of the
pump. Trying to run a
seized pump can also dam-
age the pump motor.
Your repairman can take
the pump apart like it says
in Para 4-34 in TM 3-1040-
279-12&P. He should clean
out corrosion with clean
rags, paying special atten-
tion to the gear rotor set.
Then he needs to lubricate
the parts with 15W oil
before putting the pump
back together.
If that doesn't get the
pump pumping, you need a
new pump.
Check
O-rings
Before you go to the field, make sure
both fog oil pump strainers have O-rings
and that they are in good shape. Without a
good O-ring, strainers will leak. Your
repairman can replace an O-ring with
Disassemble and clean off corrosion
Don’t forget
to
lubricate
parts with 15W
oil before you
put ‘em back
together!
Keep Your Oil
Pump Pumped
Keep Your Oil
Pump Pumped
M157 Smoke Generator Bulb
T
he NSN listed for the M157-series smoke generators' control panel bulbs in TM 3-1040-
283-20&P is no good. The correct NSN for Item 9 in Fig C-3-1 is 6240-00-155-7836.
15W
584. 46-47 (C)
5/26/01
3:38 PM
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