PS Magazine - TB 43-PS-576
PS, The Preventative Maintenance Monthly
ISSUE 576
NOVEMBER 2000
PS 576
17
NOV 00
etween your vehicle’s -10 TM and FM 21-305,
Manual for the Wheeled
Vehicle Driver
, you can find most everything you need to know about the use of
tire chains on your vehicle.
The -10 TM is boss in the matter—unless there’s no info in it on tire chain use.
Then the FM takes over.
There are, however, exceptions to the rules found in those pubs. Take note:
M939A1-series and M939A2-series 5-
ton trucks
: Use chains on the intermediate
axle only. CTIS doesn’t prohibit the use of
chains on the intermediate axle.
Palletized loading system (PLS)
: Use
chains only on axles No. 3 and No. 4.
Don’t use chains when driving on hard
surfaces where there is no wheel slippage.
Chains can cause severe component damage under “no-slip” conditions.
Also, set the CTIS to CROSS COUNTRY and proceed no faster than 10 mph
on-highway or 15 mph off-highway.
HEMTT
: Use chains only on both rear
axles. On M978 fuel tankers, never use
chains when driving on paved surfaces.
They could cause sparks.
HMMWV
: Although Page 3-28 of TM9-
2320-280-10 says to use chains on all four
wheels,
you can use chains on just the
frontwheels as a set,
or
just on the rear wheels as a set.
It’s OK to use chains
on runflat tires, too.
Remember, also, that it’s still important to select the right transfer range for
driving conditions, as prescribed in your -10 TM.
For a cross-reference list of chains and tire sizes, visit Team Tire’s web site:
M939A1/A2-series
PLS
HEMTT
HMMWV
Tire Chains . . .
Dear Editor,
I work at a contract maintenance facility. One of the things we work on
is personnel heaters.
Nearly every time we disassemble a “bad” heater, we find that someone
has readjusted the settings on the fuel regulator valve.
Crewmen get frustrated when their heater doesn’t put out enough
warm air. They adjust the valve to increase
the heat. Unfortunately, that usually makes
the heater get TOO hot and the overheat
switch shuts it down automatically. Since
the heater won’t work, we have to repair it.
Most of the time, you can get more heat
by following the proper start-up and
shutdown procedures in the heater’s -10 TM.
If that doesn’t help, the heater should be
reported.
The only time the fuel regulator valve can
be properly adjusted is when the heater is on a heater test stand.
Crewmen should NEVER touch the valve.
Jim Carter
FORSCOM QAR
Ft Hood, TX
Personnel Heaters . . .
Hopefully, your letter will lead
crewmen to take a hands-off approach
to their heater’s fuel regulator valve!
Hands off fuel regulator valve
drat!
back to the
mre
s
!
why
so
chilly
,
willy?
brrr!
the
heater
on this rig is
a
dog
! even after
i adjusted the fuel
regulator valve
m-myself!
F
R
O
N
T
F
R
O
N
T
F
R
O
N
T
F
R
O
N
T
PS 576
17
NOV 00
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