PS Magazine - TB 43-PS-740
PS, The Preventative Maintenance Monthly
ISSUE 740
JULY 2014
2
PS 740
JUL 14
Reduction Gear Box
A continual drip from the #10 seal area of the reduction gear box (RGB) without
blue exhaust smoke or measurable oil loss isn’t unusual during low RPM operation.
That’s because the viscosity
of the RGB’s synthetic oil is a
lot different from petroleum-
based oil. It can make any oil
spread appear worse than it
really is.
Your tank is fully mission
capable
as
long
as
the
accumulation
of
oil
doesn’t
exceed one ounce per hour.
Recuperator
You may see oil dripping from the drainage and
weep holes on the engine’s recuperator during
engine start-up and shutdown, whether the engine
is installed or out for ground hop operations.
However, that doesn’t necessarily mean your
vehicle has a Class III leak that deadlines it.
Follow these steps to see whether or not you
have a serious problem:
1.±
Make sure the oil and coolant hoses are hooked
up to the engine when performing this test
during ground hop.
2.±
Start the engine and run it at normal idle for
three minutes.
3.±
Check the recuperator drainage and weep holes
for oil leaks after the three minutes are up. If no
leaks are seen, shut the engine off. Your tank is
fully mission capable.
4.±
If you see leaks, run the engine for another 10
minutes at high idle or drive the vehicle at 30
mph for 5 minutes. Check for leakage again.
5.±
Any oil leakage after 15 minutes means the
vehicle is NMC.
M1-Series Tanks, M104 Wolverine…
not
all
oil drips are equal
class
III oil
drips
usually
mean bad
news.
but keep in
mind that
they
don’t
always make
your vehicle
nmc.
I’ve got an
oil leak
and
now I’m nmc!
not so
fast!
I’ve got to run
some tests before
we’ll know if you’re
deadlined.
say,
why so
sad?
if you have an oil leak,
have your mechanic
perform the checks
below to see if dead-
lining your vehicle can
be
avoided.
our viscosities
are
very
different…
…so my oil spread
may look
bigger
than it really is!
thaT’s
THe word
on leaks
and NMC
status.
I’m glad you
ClearED that uP!
740 02-03.indd
1-2
6/4/14
12:11 PM
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