PS Magazine - TB 43-PS-720

PS, The Preventative Maintenance Monthly

ISSUE 720

NOVEMBER 2012
PS Magazine - TB 43-PS-720 - Page 13 of 33
22
PS 720
NOV 12
23
PS 720
NOV 12
Arctic Cover Reminder
Before You Shut Down
Let the SUSV’s engine cool down slowly. Once
the engine is shut off, there’s no way for the heat
to dissipate. The sudden rise in heat can crack the
block, warp a head or valves, or bake the oil until it’s
not slick enough to lube the bearings.
Let the engine idle at least 3 minutes before
shutdown. This cool-down period also gives you
time to eyeball the gauges, switches and warning
lights for anything out of the ordinary.
If your SUSV has a full payload, it’ll run even
hotter. Before shutdown, idle the engine at 1,400
rpm for 30 seconds, then 900 rpm for at least 3
minutes for extra cooling.
M1235A1/A2 MaxxPro Dash DXM Tire Chain
Get a
single
tire chain for the Michelin 16.00R20 XZL tire on your M1235A1 MaxxPro
Dash DXM and M1235A2 MaxxPro Dash DXM ambulance with NSN 2540-01-597-3332.
To
get a complete set of chains for this vehicle, make sure you order a quantity of four.
Inspect HEWATT Hydraulic Drive Pump
Firefighters, there may be a problem with your unit’s HEWATTs. An orifice plug in the
hydraulic drive pump can come loose and fall into the pump. That puts a stop to water
pumping, so inspect and repair your HEWATT’s charge pump using these instructions:
If the orifice is missing, the manufacturer will supply a replacement pump. Eyeball
TACOM MAM 12-016 for more details:
That’s
complete
as in both
the front and rear car heaters.
Many times the rear car heater
bleed
point
is
overlooked.
That keeps you from getting
all the air out of the cooling
system.
Air
pockets
can
prevent
coolant circulation, increasing
engine temperature.
Take a quick look at Pages 3-73 through 3-74 of TM 9-2350-285-20 (Jun 90, w/
Ch 4, Jan 04). Note that the rear car heater coolant valve must be open during the
bleeding operation.
Follow
all
the instructions carefully. Get all the trapped air out of the cooling
system so it can do its job.
Some
drivers
are
known
to
scratch their heads about when and
how to use the arctic cover to help
the vehicle warm up.
Here’s the rule of thumb: take
the cover off before startup when
the temperature is above -15°F. If
it’s colder than that, leave the cover
on. Just make sure you remove it
before operation or the engine will
overheat.
SUSV…
heater bleed
point
PM
if
your
susv
is running
hot when it’s
cold outside,
the cooling
system
may need a
complete
bleeding to
get all the
air out.
Bleed rear
heaters in
addition
to front
heater
someone
forgot
to
bleed my
coolant and
it’s burning
me up!
here’s the low-
down on your susv’s
radiator cover!
Check all gauges
and warning lights
720 22-23.indd
1-2
9/24/12
4:05 PM
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