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Firefighting System.
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Winterization  System.
TM 5-4210-220-12 1-9 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.  - Continued n. Firefighting System  - Continued (3) The fire pump is a single-stage centrifugal-type pump.  It is mounted to the frame on the left side.  The pump is driven by the engine via a Power Take Off (PTO) gear and a reverse mounted reduction gearbox.  The PTO is equipped with an electrically controlled, hydraulically engaged clutch.  A control switch for engaging the clutch and pump drive is located in the cab.  Control of the pump flow and pressure is obtained through control of the engine speed.  A governor (throttle control) switch for this purpose is located in the cab and a throttle regulator is provided on the structural control panel. (4) The pump may be used for water or foam mixture.  Foam concentrate is drawn into the water flow via an eductor and mixed as it passes through the pump.  The pump may also be used to draft water via the 6-in suction ports on the pump body.  The pump is fitted with an automatic priming system. (5) An air-operated tank valve is used to control the delivery of water from the tank to the pump.  Discharge of water from the handline ports and turrets is controlled by manually operated ball valves.  A relief valve is installed in the pump discharge manifold to relieve excessive pressure.  A manually operated drain valve is provided between the tank valve and the tank. (6) Air-operated valves are used to control delivery of foam from the tank to the water eductor and for flushing of  the  foam  system  subsequent  to  use.    Proportioning  of  foam  agent  into  the  water  system  is  controlled  either  by  a metering  valve  located  in  the  cab  or  a  similar  valve  located  on  the  right  hand  side  of  the  pump  body  front  panel.    A manually operated drain valve is provided between the foam tank valve and the tank. (7) The roof and bumper turrets are manually controlled and operated from inside the cab.  A direct linkage from  each  turret  to  separate  control  handles  provides  the  operator  with  side  sweep  and  elevation  control.    Discharge patterns from each turret are individually controlled by separate control levers. (8) The fire hoses provided consist of 1-1/2-in and 2-1/2-in hoses equipped with couplings for attachment to outlet ports and separate nozzles.  A selection of five nozzles is available to accommodate different flow, pressure, and spray pattern requirements. 1-16

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