TM-9-2320-279-10-1
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
OPERATOR’S MANUAL VOLUME 1 OF 2
DECEMBER 1998
CHANGE 5
TM-9-2320-279-10-1 - Page 51 of 773
TM 9-2320-279-10- 1
Equipment Differences and Technical Data (Cont)
1-12. EQUIPMENT DATA (CONT).
Table 1-3. Load Classificatio n
Section III. TECHNICAL PRINCIPLES OF OPERATIO N
Vehicle Operation Systems
1-13. SYSTEMS INTRODUCTION.
All M977 vehicles contain three
functional systems. They are the electrical system, air system, and hydraulic
system. This section explains the overall operation of the functional systems.
1-14. ELECTRICAL SYSTEM.
The electrical system (fig. 1-16) is a 24 Vdc
system. Four 12 Vdc storage batteries (1) are connected in series-parallel with the
negative terminal grounded. The starting motor (2) operates directly from the
24 Vdc source through the engine start switch (3). A belt-driven 24 Vdc
alternator (4) having a capacity of 65 amps (M983 - 100 amps) maintains the
charge on the batteries. The AMPERES gage (5) shows the alternator output. The
BATTERY gage (6) shows the state of charge of the batteries and alternator
voltage output. The vehicle electrical circuits are protected against overloads by
automatic reset circuit breakers (7) located below the heater compartment panel.
Wiring harnesses are used to carry current to operate equipment and accessories.
1-3 2
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