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 202 of 481
TM 9-2320-272-10
Change 2
2-101
i.
Check air cleaner indicator (6). If red appears, indicating air restriction,
notify your supervisor.
j.
Place battery switch (10) in ON position.
NOTE
• Perform steps k. and l. for M939A1 vehicles.
• For M939A2 vehicle, crank engine first, then depress accelerator
pedal all the way down. When engine fires, release pedal to
partial travel.
k.
Depress accelerator pedal (5).
CAUTION
Do not operate starter continuously for more than 10 seconds at a
time, or with headlights on. Wait 10-15 seconds between periods
of starter operation.
l.
Place ignition switch (11) in START position. Release switch (11) after engine starts.
m.
Check your instruments:
(1)
Air pressure gauges (14) and (15) must read 50-60 psi (345-414 kPa)
before warning light (7) goes out and warning buzzer stops. Normal operating
pressures for both gauges (14) and (15) is 90-130 psi (621-896 kPa).
(2)
Oil pressure gauge (13) should read 15 psi (103 kPa) on M939/A1 series
vehicles, 10 psi (69 kPa) on M939A2 series vehicles, or higher.
(3)
Voltmeter (16) should read in green area.
(4)
Fuel gauge (17) indicates fuel level in fuel tank(s).
(5)
ABS warning lamp (18) must not be illuminated for more than three secounds.
n.
If necessary, pull out hand throttle control (9) until tachometer (12) indicates
an operating range of 700-800 rpm (800-1000 rpm on M939A2 vehicles).
o.
Allow engine to warm up approximately five minutes. If engaged, disengage
hand throttle control (9) by rotating handle and pushing in to allow engine speed to
drop to idle after warmup period.
p.
Pull out EMERGENCY ENGINE STOP control (8) if any of the following
conditions occur:
2-12. STARTING THE ENGINE (ABOVE +32°F) (O°C) (Contd)
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