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Fuel/Water Separator
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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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Figure 1-21.  Engine Governor and Throttle
TM 5-4210-220-12 1-13.  ENGINE GOVERNOR AND THROTTLE CONTROL.  The fuel metering in the injectors is adjusted by the engine governor and throttle control via a mechanical linkage (fuel rack).  The governor controls the engine idle and maximum speed.    When  the  engine  is  shut  off,  the  fuel  injectors  are  automatically  positioned  to  the  advanced  fuel  position  for starting.    Once  started,  the  governor  immediately  moves  the  fuel  rack  to  the  idle  position.    To  stop  the  engine,  the governor stop control lever is actuated.  This lever pulls the fuel rack back and shuts off the fuel supply.  The stop control lever  is  engaged  by  the  electrically-operated  fuel  shut-off  solenoid  which  is  controlled  via  the  ignition  switch.    The solenoid is always energized when the engine is running. a.  Throttle Control - Driving Mode   To control the engine speed, an air-operated throttle control air chamber is provided.  This air chamber is attached to the governor housing and linked via the governor speed control shaft to the injector fuel rack, (see fig. 1-21).  Air pressure is provided to the throttle air chamber via the treadle valve/accelerator pedal.  By depressing the accelerator pedal, the operator controls the air flow and thus the engine speed.  An internal return spring in the control air chamber will retract the linkage and reduce the engine speed to idle when the accelerator pedal is released. An external return spring provides a similar function.  It is provided to ensure positive retraction of the linkage should the internal spring fall. b.  Throttle Control - Firefighting Mode. (1)  Variable, stabilized engine speed is required to provide infinite control of the water pump pressure.  To achieve  this,  a  pressure-regulated  throttle  control  governor  is  mechanically  linked  to  the  engine  speed  governor.    The throttle control governor consists of two pressure chambers mechanically connected to the governor speed control shaft. The  pressure  provided  in  the  air  chamber  will  increase  the  engine  speed.    This  will  result  in  increased  water  pressure which, via the water pressure chamber, will tend to retard the speed.  Stable speed is obtained when the force from the water pressure equalizes the force from the air pressure. NOTE The area of the air chamber is three times larger than the area of the water chamber.  This feature enables control of water pressures that are three times higher than the controlling air pressures. (2)  When the firefighting equipment is engaged in CFR mode, air pressure, preset at 80 psi (475 kPa), is provided  to  the  air  pressure  chamber.    The  counterbalance  water  pressure,  therefore,  is  240  psi  (1630  kPa).    This  is obtained at an engine speed of about 1200 rpm. (3)  In the structural firefighting mode, engine speed and thus water pressure is manually controlled.  Throttle control air pressure is provided to the air pressure chamber from the hand throttle (air regulator) on the structural control panel. 1-28

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