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FIREFIGHTING SYSTEM - TM-5-4210-233-14P-1_26
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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Load Center
TM 5-4210-233-14&P-1 1-18.  AERIAL LADDER/WATER TOWER.    The  firetruck  is  equipped  with  a  hydraulic-powered,  telescoping, aerial ladder equipped with a remote nozzle. a.    Hydraulic  System.    The  hydraulic  system  used  to  actuate  the  aerial  ladder/water  tower  consists  of  the following: (1)  A hydraulic reservoir with an internal filter. (2)  A pressure-compensated variable displacement hydraulic pump that is engine-driven via a power take- off.  A throttle control on the pump control panel controls engine speed during aerial operations. (3)         Each   of   the   four   outriggers   use   hydraulic   cylinders   for   the   extend/retract   functions   and   for   the raise/lower functions.  These functions are controlled by the outrigger cylinder controls located at the back of the truck. (4)    The  ladder  hydraulics  consist  of  the  ladder  lift  cylinders,  ladder  extension  retraction  cylinders  and  a turntable rotation motor and brake.  The ladder hydraulic system is supplied by hydraulic lines that are fed through a swivel to allow for continuous 360 degree rotation of the ladder.  The truck has the ability to operate all three ladder functions simultaneously with a minimum loss of speed or power. (5)    The  turntable  is  rotated  by  a  hydraulic  motor  with  a  planetary  gear  drive'  assembly.  A  hydraulically- released,  spring-actuated  brake  provides  positive  stops  of  the  aerial  ladder  rotation.  The  brake  is automatically disengaged by the same valve that controls the turntable rotation motor. (6)    For  safety  reasons,  the  outrigger  hydraulic  functions  and  the  ladder  hydraulic  functions  cannot  be operated at the same time.  Hydraulic oil is either pumped to the outriggers or the ladder.  This routing of  hydraulic  oil  is  controlled  by  an  electrically-actuated  diverter  valve  operated  from  the  outrigger control panel on the back of the truck. (7)  The outriggers must be extended at least 18" and supporting the weight of the truck before the diverter valve will direct oil flow to the ladder and make the ladder functions operable.  Once the diverter valve is  switched  to  aerial  operation,  the  outriggers  cannot  be  operated  until  the  ladder  is  in  the  bedded position. (8)  In case of failure of the main hydraulic pump, an electrically powered back-up pump can be used.  This back-up  pump  is  driven  by  a  12  VDC  electric  motor  powered  by  the  truck  batteries.  The  emergency pump  provides  for  limited  functions,  and  is  activated  by  switches  located  on  the  outrigger  and  ladder control panels. 1-19.  AUXILIARY POWER CIRCUITS  The auxiliary power circuit includes: the generator (auxiliary power unit or APU), a load center, five 110-volt receptacle outlets and various switches and meters. a.   Auxiliary  Power  Unit  (APU).    The  APU  is  a  vertical  four-stroke, overhead-valve diesel engine.  This air-cooled APU is equipped with a    governor    to    maintain    constant    speed    and    output.    A    4-pole regulated, self-excited generator serves as both a starting motor for the  diesel  engine  and  the  power  source  for  the  APU  circuit.    The generator generates 110 VAC when the diesel engine is running.  The APU  can  be  started  from  any  one  of  three  locations:  the  cab,  the street  side  pump  panel  or  from  the  APU  itself.    The  APU  must  be preheated prior to starting.  When the preheat switch is depressed, a manifold  heater  heats  the  intake  air  in  the  engine  manifold  and  a glow plug heats the pre-combustion chamber. 1-20

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