C H A P T E R 2
P R I N C I P L E S O F O P E R A T I O N
S e c t i o n I . I N T E G R A T E D S Y S T E MS
This section describes how major systems of the carrier operate. An understanding of how each part functions
in a system and how components relate to each other will help you solve Possible maintenance problems with
The power plant consists of the diesel engine, transfer gearcase, transmission and differential. The fuel,
exhaust, cooling, starter, generator, and engine air systems are support systems for the power plant.
The diesel engine is the primary source of power for the earner. The engine converts air and diesel fuel into
energy and delivers this power to the transfer gearcase.
The engine is equipped with a heavy duty starter. The starter, with built-in solenoid, is used to crank the
engine for starting.
The generator is part of the carrier electrical system. It is driven by the transfer gearcase. The generator
charges the batteries in the carrier when the engine is running. A regulator mounted in the drivers
compartment keeps the voltage at correct levels.
GENERATOR FIELD SWITCH
The generator switch is mounted on the secondary fuel filter. When starting the engine the field switch is open
and the generator is not energized to allow the engine to start with less drag. When the secondary fuel filter is
pressurized with fuel, the field switch closes and signals the regulator to energize the generator and start
charging the batteries.