PS Magazine - TB 43-PS-686
PS, The Preventative Maintenance Monthly
ISSUE 686
JANUARY 2010
53
PS 686
JAN 10
T
he Fox can be quite thirsty when it comes to fluids: engine oil, transmission fluid,
hydraulic fluid, antifreeze, even grease. If you let your Fox run dry, it will stop in its tracks.
Mission missed. Expensive repairs to follow.
Pay attention to fluids and where they go. Crews sometimes use the wrong fluid
or put fluid in the wrong place. All the fluid ±ller spouts are clearly marked for
what they go to. So make sure you don’t pour oil or transmission fluid in the radiator. Yes,
that has happened! Here’s a quick rundown of the fluid checks and what speci±c fluids
are needed:
Axles, power divider,
amphibious system.
They
take GO 80/90. For the
axles, the fluid should
reach
the
lower
edge
of the ±ll hole. On the
planetary gear set cover
of the ±rst and second
axle, read the fluid level
in the window. For the
steering knuckles, use the
dipstick from your tool
bag to measure.
Engine oil.
Use OE/HDO-
15/40. With the engine
off, the reading should be
between MIN and MAX.
If the engine has been
running, wait at least three
minutes after shutdown
to measure.
Transmission oil.
Use OE/HDO-10. The transmission oil should be at MIN level before
starting the engine. With the engine idling, the reading should be between MIN and MAX
of the ±rst range (30°C). But remember to pay attention to the engine temperature. Read
the temperature gauge. The cold range on the dipstick is the lower range (30°C) and the
warm range (80°C) is the higher.
Hydraulics.
Do not use cherry
juice.
You are supposed to use H540,
but unfortunately there is none in
the supply system. Hydraulic fluid
AW46 from your main battle tank
can be used instead. Make sure
it’s not red and it’s not petroleum-
based. There is no NSN for AW46,
but your Fox maintainer can get
you all you need.
To check hydraulic fluid, turn the main
power switch to Position 2 and wait until the
electro-hydraulic pump shuts off. The fluid
level should be between MIN and MAX.
Brake system.
Use H515 brake fluid only.
The master cylinder reservoir under the
dash should to be up to MAX. The system
expansion tank behind the driver should be
up to MAX. NSN 9150-00-082-7524 gets 10
gallons of H515.
Air brake frost protector.
Use denatured alcohol. On the dipstick it should read between
MIN and MAX. When the locking T-rod is in WINTER (the lower) position, the brake system
is fed with denatured alcohol and moisture in the air lines does not freeze. During the
summer, turn the T-rod 90° and let the rod come up.
Cooling system.
Use ethylene glycol antifreeze in a mixture of
1
/
2
antifreeze and
1
/
2
water. Check the antifreeze with the engine cold. The level should be within one inch of
the sensor in the ±ll neck. Test the strength of the antifreeze with the antifreeze solution
tester. You don’t want the antifreeze too weak or too strong. If it’s too weak, the coolant
could freeze in the cold. If it’s too strong, the engine won’t be cooled suf±ciently in
hot weather.
Grease Fttings.
Use WTR aircraft grease. Use
your on-board grease gun because US grease ±tting
adapters are a bit too big for the Fox ±ttings. Lube
the ±ttings until grease becomes visible.
Don’t
Fox CBRN Vehicle…
Don’t
Let Fox
Run Dry
Use GO-80/90 on axles, power divider, and amphibious system
Engine oil should be between MIN and MAX
MAX mark
MIN mark
I’m sure
happy to see
you guys.
I’m so dry I can hardly
spit, much less
sniff
out chemical threats!
check
all
of these fluids
to outFoX fluid
prOblems!
Use WTR aircraft grease for lubing the drive train
Use only H515
brake fluid for
brake system
Hydraulic fluid goes here. Use only AW46 fluid
686.52-53.indd
1-2
11/23/09
2:29:56 PM
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