PS Magazine - TB 43-PS-598
PS, The Preventative Maintenance Monthly
ISSUE 598
SEPTEMBER 2002
M109-Series SP Howitzers, M992A2 Ammo Carrier…
G
ot a sticky accelerator pedal on your howitzer or ammo carrier? That could be
bad news if you need to stop quickly.
Have your mechanic give the return
spring and return arm a few squirts of lubri-
cating spray, NSN 9150-00-458-0075.
Move the pedal back and forth a few times
to work in the spray. That should get the
pedal moving smoothly again.
If the return spring is stretched or broken,
replace it with NSN 5360-00-805-3685.
Prevent future sticking problems by lub-
ing the return spring and arm quarterly with CLP like it says in the lubrication
instructions of your vehicle’s -10 TM.
PS 598
SEP 02
14
M992A2 Ammo Carrier…
Get New Ground For Gauge
Squirt stuck return arm
with lubricating spray
…but the
accelerator
pedal was
stuck!
a little lubricating
spray could have
fixed that sticky
problem.
this isn’t
exactly what I
had in mind
when I said my
APU control
panel needed a
new ground!
6.
Plug the
other end of
the electrical
lead into the
remaining
empty socket
of the Y
connector.
7.
Reinstall
the rear panel
and APU
control box.
Stud
Oil pressure gauge
B
efore you replace a malfunctioning engine oil pressure gauge in the M992A2’s
APU control box, mechanics, check the ground.
The gauge is currently grounded through its mounting bracket. But since contact
there can be skimpy, the gauge may not work.
The solution is to use a ground wire to attach the mounting bracket to an incom-
ing ground that’s already in place. Here’s how:
1.
Remove the APU control box and take off the rear panel following the instruc-
tions starting on Page 7-62 of TM 9-2350-293-20-1.
2.
Disconnect the ground lead that leads to the generator switch.
3.
Connect the single side of the Y connector, NSN 5935-00-900-6281, to the loose
ground lead of the wiring harness.
4.
Fasten the ground lead from the generator switch to the double side of the Y con-
nector using a connector adapter, NSN 5935-00-807-4109.
5.
Remove the nut and lockwasher from the engine oil pressure gauge mounting
stud. Slip the terminal end of the electrical lead, NSN 5995-01-197-8948, over the
stud and secure it with the nut and lockwasher.
598. 14-15 (C)
8/2/02
11:36 AM
Page 1
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