TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 209 of 1313
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:
A. HAND THROTTLE CONTROL
- Used to set engine speed without maintaining pressure to the accelerator
(rotated to lock).
B. EMERGENCY ENGINE STOP CONTROL
- Is pulled out to cut off fuel to engine. Used only in
an
emergency.
C. ACCELERATOR PEDAL
- Controls engine speed.
D. MODULATOR
- With transmission selector lever in drive, modulator controls transmission upshifting and
downshifting as engine rpm changes.
E. CABLE
- Connects modulator to fuel pump.
F. ACCELERATOR LINKAGE
- Links accelerator pedal and throttle control to fuel pump.
A
B
C
D
E
F
B
A
G0015DAA
Figure 3.
Accelerator Controls System Components.
TM 9-2320-272-23-1
0003
0003-4
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