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Figure 3-38.  Apron, removal and installation
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Pump Clutch Linkage a. Removal
Figure 3-39.  Pump compartment panel, removal and installation. Section XlIl.  PUMPING SYSTEM 3-86.  General The fire truck pumping system consists of a centrifugal type pump rotary vacuum priming pump, steady valve, relief valve; water tank, foam and two motor driven hose reels.  A series of operating valves, drain valve, and a foam  metering  valve.    Regulate  operation  of  the  fire pump    for    pumping    water,    or    a    water    and    foam combination.      The   centrifugal   type   pump   develops pressure  and  capacity,  by  means  of  centrifugal  force, and must be primed before it will lift water.  The priming system consists of a rotary vacuum pump operated by a 24-volt   electric   motor   controlled   through   a   manual priming valve which activates a microswitch controlling the    electric    motor.        Water    pressure    is    controlled manually by a throttle knob and is held automatically by a relief valve.  The relief valve is adjusted to any pump pressure  up  to  300  psi.    The  hose  reels  are  electric motor  driven,  and  actuated  by  a  reel  rewind  button, located    beneath    the    hose    reel    assemblies    on    the instrument panel.  The heat exchanger is mounted in the engine compartment,  and  circulates  water  through  the  engine cooling  system  from  the  pumping  system  to  cool  the engine.    The  primer  oil  tank  is  mounted  on  the  engine cab  beneath  the  right  hand  seat.    It  supplies  oil  to  the primer pump. 3-87.  Primer Pump a. Removal. (1) Remove   the   primer   pump   motor   and solenoid relay (para 3-71). (2) Refer   to   figure   3-40,   and   remove   and replace   defective   primer   pump   from   the   fire   pump manifold. b. Installation.  Install the primer pump motor and solenoid relay (para 3-71). 3-88.  Hose Reel a. Removal. (1) Remove   the   hose   reel   motor   solenoid (para 3-68). (2) Remove the hose reel motor (para 3-69) - (3) Refer to figure 3-41, and remove the 3-55

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