tire/wheel assemblies are foam filled to prevent
A/S32P-25 FIRE-FIGHTING VEHICLE
deflation due to heat or shrapnel, and are nonrepairable.
LEARNING OBJECTIVES: Define the
All instruments and gauges for operating and
purpose for the A/S32P-25 mobile fire fighting
monitoring the fire-fighting truck are located on the
units. Identify components of the fire-fighting
control panel assembly in front of the driver (fig. 13-5).
unit. Identify procedures for troubleshooting
and maintenance of the fire-fighting unit.
The A/S32P-25 fire fighting vehicle, also known as
the P-25 (fig. 13-4) was designed to control or
The A/S32P-25 employs a hydraulic system made
extinguish small fires on aviation ships. It is 64 inches
up of three distinct subsystems--wheel drive/water
high by 70 inches long and weighs 18,850 pounds when
drive, steering, and aqueous film-forming foam
fully ready to fight fires. The engine is a turbocharged,
(AFFF). Knowledge of the hydraulic system principles
after-cooled, two-cycle, six-cylinder, liquid-cooled
of operation is necessary to properly operate and
Detroit Diesel Model 6V-53TA. It provides drive for the
maintain the unit.
hydraulic and dc electrical systems. This engine has a
cold weather starting system that consists of a glow
AFFF Hydraulic Subsystem Operation
plug in each cylinder combustion chamber. The P-25
uses a hydrostatic rear-wheel drive with a hydraulic
The AFFF pump control valve receives an
motor and an axle planetary on each rear wheel. The
electrical input from the Standby/Off switch and charge
40 PSI MIN AT
OPERATING RPM 2750
SWITCH PANEL GAUGE
PUSH BUTTON LIGHT
Figure 13-5.--Controls and indicators on the A/S32P-25 fire-fighting vehicle.