TM  10-4320-343-14 1.14.2.7.4     Actuator.  The   actuator   is   mechanically   linked   to   the   control   box   and   the It   is   positioned   by   electrical   signals   received   by   the   control engine   governor. box. The   position   of   the   actuator   controls   the   engine   speed. When  the  speed  needs to   be   either   increased   or   decreased,    the   actuator   is   moved   by   the   control   box through   the   mechanical   linkage. The   mechanical   linkage   to   the   governor   is repositioned  changing  the  engine  speed. 1.14.2.8   Pump Assembly. The  pump  assembly  transfers  fluid  from  one  point  to  another point. Figure  1-11  is  a  functional  diagram  of  the  pump  assembly. The   fluid   is brought   into   the   350   GPM   pump   via   the   suction   section. The   suction   section provides   two   suction   inputs. Each  suction  input  has  a  valve  that  controls  the  size of   opening   to   the   suction   side   of   the   pump. In   addition,   each   suction   input   has   a coupling   half   to   connect   to   the   fluid   source. Both   suction   inputs   are   connected   to the   suction   manifold. The  suction  manifold  is  connected  to  the  suction  side  of  the volute. The   suction   section   consists   of   two   coupling   halves,   two   gate   valves,   and the   suction   manifold. When   the   engine   is   started,   the   flexible   coupling   attached   to   the   shaft   in   the intermediate   housing   rotates   in   a   clockwise   direction   and   the   shaft   rotates   freely on   two   bearings. The  rotation  of  the  shaft  causes  the  impeller  to  turn in   a   clockwise   direction. This   creates   a   suction   on   the   suction   side   of   the   volute and   liquid   is   forced   into   the   suction   section. When   the   suction   side   gate   valve   is open,   the   fluid   is   forced   through   the   coupling,   gate   valve,   and   suction   manifold into   the   volute. The  fluid  is  then  forced  into  the  small  opening  at  the  front center   of   the   impeller. Since   the   impeller   is   turning,    the   fluid   spins   through   the impeller. This   spinning   action   increases   the   fluid   pressure   and   forces   the   fluid to   the   top   of   the   impeller. When   the   fluid   reaches   the   top   of   the   impeller,   the fluid   is   forced   out   the   openings   in   the   top   of   the   impeller   into   the   top   of   the volute   housing. Openings   in   the   volute   housing   and   top   of   the   impeller   are   the   same   size. The force  of  fluid  from  the  impeller  causes  the  fluid  to  spin  upward  along  the  opening in   the   volute. The   force   and   pressure   is   thus   increased   as   the   fluid   is   forced   out the   discharge   side   of   the   volute   into   the   discharge   manifold. Actual   fluid pressure   is   determined   by   the   speed   of   the   flywheel. Higher   engine   speeds   increase flywheel  speed  which  creates  higher  pressure  outputs  from  the  pump  assembly. Fluid   is   then   forced   out   the   discharge   side   of   the   volute   into   the   discharge section. The   discharge   section   provides   two   outputs. Each   output   has   a   valve   that allows   connection   of   two   4   inch   hoses. The   discharge   section   consists   of   two coupling   halves,   two   gate   valves,   discharge   manifold,   and  a  discharge  connection. When   the   gate   valve   is   opened,   the   fluid   is   forced   through   the   discharge connection,   discharge   manifold,   gate   valve   and   coupling   half. The   discharge   valve controls   the   size   of   the   opening   from   the   discharge   side   of   the   pump   assembly. 1.14.2.9     Fuel Tank. The   fuel   tank   provides   storage   for   diesel   fuel   and   has   a   19 gallon   (71.9   liter)   capacity. The   tank   has   a   fuel   level   gauge,   two   fuel   source selector   valves,   filler   cap,    drain   plug,   and   overflow   return   fitting. gage   provides   a   visual   inspection   of   the   fuel   level   inside   the   tank. When  the  fuel level   is   low,   fuel   is   added   to   the   tank   via   the   filler   cap. The   fuel   is   routed from   the   fuel   tank   to   the   fuel   system. 1.14.2.10     Wheel  Mounted  Frame  Assembly. The  wheel  mounted  frame  assembly  allows  the  350 GPM   Pumping   Assembly   to   be   towed   behind   a   mobile   vehicle   for   short   distances. 1-23/(1-24  blank)