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 47 of 481
TM 9-2320-272-10
1-30
1-17. CONTROL SYSTEM OPERATION (Contd)
b. Accelerator Controls System Operation.
The accelerator controls system permits the operator to control vehicle speed and
engine power. It is identical on all models covered in this manual. Major
components of the accelerator control system are:
HAND THROTTLE CONTROL
– Sets engine speed at desired rpm without
maintaining pressure on accelerator pedal.
EMERGENCY ENGINE STOP CONTROL
– Is pulled out to cut off fuel to
engine. It is used only in an emergency.
ACCELERATOR PEDAL
– Controls engine speed.
MODULATOR
– With transmission selector lever in drive, modulator
controls transmission upshifting and downshifting as engine rpm changes.
CABLE
– Connects modulator to fuel pump.
ACCELERATOR LINKAGE
– Links accelerator pedal and throttle control to
fuel pump.
F
E
D
C
B
A
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