PS Magazine - TB 43-PS-669

PS, The Preventative Maintenance Monthly

ISSUE 669

AUGUST 2008

PS Magazine - TB 43-PS-669 - Page 3 of 33
2
PS 669
AUG 08
3
PS 669
AUG 08
M
echanics, when you remove the f
ll plug to add oil to the diFFerential, take a close
look at the metal gasket on the plug.
IF the gasket is missing or damaged,
oil will leak From around the plug.
Lose enough oil and the diFFerential
gears can lock up. A replacement
gasket comes with NSN 5330-12-
124-0982.
IF the gasket is in good shape, clean
it oFF and wipe around the opening in
the diFFerential beFore reinstalling the
plug. Dirt or sand under the gasket
will also allow a leak.
T
he wheel hubs on your Stryker have sight glasses For checking the oil, drivers.
Easy stuFF, huh?
It’s a little more complicated than you might think. Checking the oil is actually a
two-step process that involves oil level and oil color.
Oil Level
Wheel hub oil levels should be
checked aFter every operation—but
not immediately aFter. You need to
allow about an hour For the oil to
run back From the planetary gears
into the hub to get an accurate
reading. Do it too soon and you’ll
end up overf
lling the hubs.
The correct oil level should be
in the upper halF oF the sight glass,
usually between
3
/
4
and
7
/
8
Full.
Oil Color
Oil color in your Stryker’s hubs will vary. Knowing how to read the color code can
head oFF damage.
New oil will be yellowish to clear in color. It soon turns black—usually within the
f
rst 25 miles or so. Either oF those two colors are OK as long as the level is good.
But iF the oil turns milky or greenish in color,
you’ve got a problem. Those colors mean the
oil is contaminated with water and has lost its
ability to lubricate. Your Stryker is NMC until
your mechanic can fl
ush the contaminated oil
and ref
ll the hub with SAE 75W90 oil.
Mechanics,
go
slow
and
easy
when
replacing the oil. There is a small lip inside
the f
ller hole that makes f
lling the hub slow
work. Go too quickly and the oil will overfl
ow
all over the hub.
Just one loose wheel nut will put
more strain on its neighbors. They
loosen and, beFore you know it,
you’ve got a runaway wheel.
Look closely at the wheel stud nuts
when you perForm beFore operation
PMCS. IF you spot any rust or shiny
areas under the nuts, your vehicle is
NMC. Report it. Your mechanic will
inspect and then retighten the nuts to
226-236 lb-Ft.
Stryker…
Hub Oil Simplified
Gasket Makes a
Differential Difference
Differential F
ll plug’s metal gasket
missing or damaged? Replace it
Stryker…
a little thing like a loose nut can
have some pretty big consequences
for your stryker, drivers.
Wheel nuts loose?
Call your mechanic
Loose
Nuts
=
Loose
Wheels
your wheel
hubs are
low on oil,
so I’m gonna
add some!
are you
sure
they’re
low?
did you
wait long
enough
before
checking
them?
Oil level should be in upper half of sight glass
Lip inside hub F
ll hole
can cause oil overfl
ow
669.02-03.indd
1-2
6/29/08
4:27:46 PM
Click here for a copy of this article to save or email.
Click here for a copy of these articles to save or email.


Back to Top
Back to Top