1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. - Continued
q. Auxiliary Power Unit.
(1) The Auxiliary Power Unit (APU) consists of a five horse-power, four cycle, air cooled diesel engine
driving a 12-volt 80-amp alternator and the circulation pump needed for operation of the wlnterlzatlon system, (see fig.
1-16). The APU is equipped with an electric starter motor as well as a rope pulley for manual cranking. Fuel for the APU
is provided from the main engine fuel tank.
(2) The APU is located in the lower front right compartment of the hose body. The combustion air filter is
mounted under the hose body on the back face of the compartment. The engine exhaust is piped out of the
compartment toward the rear of the truck. A blower fan in the pump body is connected with ducting to the hose reel
compartment to provide warm air to this compartment and thus prevent freeze-up of the hose reel components.
Figure 1-16. Auxiliary Power Unit
Change 7 1-18