PS Magazine - TB 43-PS-597
PS, The Preventative Maintenance Monthly
ISSUE 597
AUGUST 2002
1.
Disconnect the electrical connector from the
voltage regulator mounted on the alternator.
2.
Start the engine. (Don’t operate the truck for
too long with the regulator disconnected or you’ll
run down the battery).
3.
Check to see if the DO NOT SHIFT light goes out. If it does, the alternator is the
problem and there’s a capacitor installation kit available to fix it.
Contact the Oshkosh Truck Defense Service Department, (800) 235-9151, ext
2681, to get the free kit.
All trucks with 200-amp alternators installed after Jun 99 and with serial numbers
66376 and higher have the capacitor already installed. The alternators have serial
numbers 318 and higher.
If the DO NOT SHIFT light stays on when the truck is started with the voltage
regulator disconnected, the alternator is not the problem. So continue to troubleshoot.
PS 597
AUG 02
3
HMMWV…
A
cargo floor access hole and cover kit, NSN 2510-01-454-7077, lets you work on
a HMMWV fuel tank without dropping it.
Once the kit is installed, you
can work on the sending unit or
replace a leaking access cover
gasket with the fuel tank in place.
The kit comes with instruc-
tions, hardware and plate. Get
the kit and the next time you
have to drop the tank, make the
hole and install the cover while
the tank’s off.
The kit cannot be used on ambulances (M996/M997) or Avengers because of their
design. The kit might prove impractical on shelter carriers, too.
FMTV D-rings Get Lube
I
t’s a simple thing, maintainers, but don’t overlook the cargo bed D-rings on
FMTV trucks and trailers when you’re lubing. LOs require the D-rings be lubed
by oil can every 1,000 miles or monthly. If you ignore the lube, you’ll have prob-
lems with corroded or broken D-rings—and your hauling will come to a halt.
S
ome PLS trucks are still having problems with
the transmission not shifting or the DO NOT
SHIFT lamp lighting up. Alternator voltage peaks
are probably the cause.
Some PLS trucks, built between Aug 97 and
Jun 99 with serial numbers 63479 through 66375,
are experiencing voltage peaks on the 200-amp
alternator. The peaks show up as DO NOT SHIFT
lights on the dashboard, or even as a transmission
that won’t shift after the engine is started.
what the-?
the
do not
shift
light
just came
on!?
I turned it
on to let
you know my
alternator
needs
checking!
Is DO NOT SHIFT
lamp lighting?
Disconnect regulator connector
from alternator
Remove floor
access cover…
Here’s an easy
check mechanics
can use to
determine if the
alternator is
the problem…
M1074/M1075 PLS…
good news!
these babies
are gettin’
access covers!
It’s about
time! this guy
has
cold
hands!
…to reach
fuel tank
underneath
597. 02-03 (C)
6/26/02
6:22 PM
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