TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 143 of 481
CREWMEMBER
PROCEDURE
2-44
Change 2
Table 2-3. Preventive Maintenance Checks and Services for Models M939/A1/A2 (Contd).
ITEM
NO.
INTERVAL
ITEM TO
CHECK/
SERVICE
NOT FULLY
MISSION
CAPABLE IF:
TM 9-2320-272-10
LOCATION
12
Before
Controls
and
Instru-
ments
a.
Seatbelt(s)
are missing or
damaged.
b.
Engine will
not start.
c.
ABS warning
lamp stays on.
d.
Air cleaner is
cracked, unser-
viceable, or stays in
the red.
e.
Tachometer
(2) inoperable or
reads less than 600
rpm or more than
650 rpm (M939/A1),
565-635 rpm
(M939A2) at idle.
f.
Temperature
gauge (3) reads
less than 175°
(79°C) or exceeds
220° F (104°C).
g.
Reads less
than 60 psi (414
kPa). Warning
buzzer stays on
or does not
operate.
DRIVER
WARNING
If NBC exposure is suspected,
all air filter media should be
handled by personnel wearing
protective equipment. Consult
your unit NBC officer or NBC
NCO for appropriate handling
caution or disposal instructions.
a.
Check for missing or damaged
seatbelts.
b.
Start engine (para. 2-12).
.
c.
Check that ABS warning lamp
(9) comes on for approximately
three seconds and then goes out.
NOTE
The engine must be running to
perform the following checks.
d.
Air cleaner indicator (1)
should be in the green area.
e.
Tachometer (2) should read
600-650 rpm (M939/A1), 565-635
rpm (M939A2) at idle.
f.
Check engine water
temperature gauge (3). (Normal
range is 175° - 200°F (79 - 93°C)
with engine warmed up.
g.
Check primary air pressure
gauge (4) and secondary air
pressure gauge (6). Normal range
is 90 to 130 psi (621 - 896 kPa).
Make sure warning buzzer is
operational.
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