TM-9-2320-279-10-2
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
OPERATOR’S MANUAL VOLUME 2 OF 2
DECEMBER 1998
CHANGE 3
TM-9-2320-279-10-2 - Page 30 of 819
1-33. AIR
1-32. ELECTRICAL
1-31. SYSTEMS
TM 9-2320-279-10-2
Equipment Differences and Technical Data (Cont)
Table 1-4. M954E1 Equipment Data (Cont)
Section III. TECHNICAL PRINCIPLES OF OPERATION
Vehicle Operation Systems
All M984E1 vehicles contain three
functional systems. They are the electrical system, air system, and hydraulic
system. Refer to Volume 1 for explanation of the overall operation of the
functional systems.
The electrical system is a 24 Vdc system. Refer
to Volume 1 for explanation of the overall operation of the electrical system.
The air system (fig. 1-24) consists of an engine driven air
compressor (1) and four air reservoirs (2, 3, 4, and 5).
The air system includes the necessary valves and air lines to control the
vehicle’s air operated parts. Pressurized air from the air compressor is passed
through the air dryer (6) to the quick buildup reservoir (2). The air dryer removes
dirt and moisture from the pressurized air. Air from reservoir goes to the throttle
treadle (7). Depending on how far the throttle treadle is depressed, 0 to 60 psi (0
to 414 kPa) is supplied to the engine throttle air cylinder (8) and to the
transmission modulator (9). This air pressure controls the vehicle speed.
Change 3
1-15
Table 1-5. M994E1 Load Classification
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