TM 10-4320-344-10 Item Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Table  2-3. Description  of  Model  609-C  Control  Panel. Description ENGINE  TEMPERATURE HIGH   Indicator Panel   Lights ENGINE  OVERSPEED Indicator ENGINE  OIL  LOW Indicator ENGINE  SPEED Tachometer ENGINE  OIL  PRESSURE Gauge ENGINE RUN TIME Hourmeter PUMP DISCHARGE PRESSURE  Gauge ENGINE  Switch AUTO THROTTLE Rheostat AUTO SELECT Switch THROTTLE  SELECT Switch LIGHTS Switch/Rheostat MAIN  POWER  Switch PUMP  SUCTION PRESSURE  Gauge ENGINE  VOLTS Voltmeter ENGINE   TEMPERATURE Gauge Function Lights  when  engine  overheats. Indicator   has   PRESS   to TEST   feature. Illuminate   control   panel. Lights  when  allowable  engine  rpm  is  exceeded. Indicator  has  PRESS  to  TEST  feature. Lights   when   engine   oil   pressure   is   low. Indicator   has PRESS  to  TEST  feature. Shows  engine  rpm. Indicates   engine   oil   pressure   in   psi. Indicates   total   accumulated   operating   hours   of   engine. Indicates   water   pressure   in   psi   at   pump   discharge port. Three-position    toggle    switch. Used   to   start,   run,   and stop  engine. START   position   is   spring   loaded. Used   to   set   desired   water   output   pressure   or   engine speed,   in   automatic   mode   of   operation. Used   to   select   engine   speed   or   pump   pressure   in automatic   mode   of   operation. When  SPEED  is  selected engine   speed   remains   constant   regardless   of   water pressure. When  PRESSURE  is  selected  water  pressure remains   constant   and   engine   speed   varies. Used  to  select  MANUAL  or  AUTO  throttle. When  set  to AUTO  throttle,  engine  speed  is  controlled  by  demands of   system. Resulting   speed   is   directly   related   to settings of AUTO SELECT Switch (11) and AUTO THROTTLE Rheostat   (10). Turns   panel   illumination   lights   on   and   off   and controls   brightness   of   illumination. Two-position   toggle   switch. Used   to   apply   electrical power   to   system. Switch   will   shut   off   (trip)   if   an electrical   overload   condition   occurs. Indicates   water   pressure   in   psi   on   suction   side   of pump. Indicates   battery   charge. Indicates   engine   temperature   in   degrees   F   and   degrees C. 2-6