TM 9-2320-272-10
2-12.
STARTING THE ENGINE (ABOVE +320F) (O°C) (Contd)
NOTE
Perform steps k. and 1. 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).
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
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