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.
HYDRAULIC SYSTEM
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
RPM
OIL PRESSURE
WATER TEMP
GAUGE
GAUGE
OIL TEMP
GAUGE
OIL PRESSURE
40 PSI MIN AT
HYDRAULIC
WATER
2750 RPM
180 MAX
210 MAX
BATTERY VOLTAGE
INDICATOR
OPERATING RPM 2750
OFF
ON
OFF/ON/START
SWITCH
START
LIGHTS
PANEL
HEAD
GLOW PLUG
HEAD
ON
ON
OFF
OFF
READY
HEADLIGHTS
FUEL
DIMMER
GLOW HEADLIGHT
SWITCH PANEL GAUGE
GLOW
PLUG
ON/OFF
EMERGENCY
PLUG
READY
SWITCH
LIGHT
SHUTDOWN
PANEL
ON/OFF
INDICATOR
DIMMER
PUSH BUTTON LIGHT
(MOMENTARY
SWITCH
SYSTEM READY
CONTACT)
INDICATOR
LIGHT
EMERGENCY
SHUTDOWN
SYSTEM
READY
WATER
PUMP ON
WATER PUMP
ON INDICATOR
LIGHT
STANDBY
ON
OFF
STANDBY/OFF
OFF
PARKING
SWITCH
BRAKE
HOURS 1/10
PARKING
HOUR
BRAKE
INDICATOR
ON/OFF
SWITCH
ASf13005
Figure 13-5.--Controls and indicators on the A/S32P-25 fire-fighting vehicle.
13-7
