PS Magazine - TB 43-PS-736
PS, The Preventative Maintenance Monthly
ISSUE 736
MARCH 2014
11
PS 736
MAR 14
The FMTV’s normal engine oil pressure is between 15-80 psi.
In addition to an oil pressure gauge, your truck has an oil pressure
warning light.
Do the following if the gauge or the light indicates problems:
•±
If the engine low oil pressure indicator lights up and the gauge
reads above 15 psi, continue the mission. When the mission’s
over, tell your mechanic about the low reading.
•±
If the engine oil pressure gauge reads in the red zone and the
engine low oil pressure indicator is not lit, shut off the engine
and do the following:
1.±
Restart the engine. If the light only comes on briefly,
but then goes out, continue the mission.
2.±
If the light does
not
come on, or comes on and
stays
on,
turn off the engine and call in your mechanic.
Oil±Pressure±Switches
Basic FMTVs with Caterpillar 3116 engines use the analog-style 12 psi-activated
pressure switch, NSN 5930-01-528-7523. This is used on trucks with serial numbers
below 11,438. It replaces NSN 5930-01-384-5419, which is shown as Item 6 in Fig
68 of TM 9-2320-365-24P (Aug 05).
FMTV –A1 models with Caterpillar 3126 engines use the digital-style 6 psi-
activated pressure switch, NSN 5930-01-515-6564. This is used on trucks within the
serial range of 11,438-25,248.
Finally, FMTV –A1 models with Caterpillar C7 engines use a digital-style pressure
switch, NSN 6620-01-524-9112. That’s used on trucks with serial numbers higher
than 100,000. By the way, there are no trucks within the serial range of 25,249–
99,999.
FMTV…
Engine
oil Light
reminder
Drivers,
listen up!
There are
three
different
oil pressure
switches used on
FMTV vehicles.
The pressure
switch used
depends on which
model FMTV you
have.
The
newer
switches have
an improved diaphragm
made out of a more
durable material.
Here’s
what you
need to
know…
so, the engine
low oil pressure
light
not
being lit
is “
no big deal,”
huh?
Keep needle
out of red
736 10-11.indd
1-2
1/28/14
2:48 PM
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