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Page Title: Foam Does Not Have Proper Characteristics for Effective- Use
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3-15.    Foam  Does  Not  Have  Proper  Characteristics for Effective- Use Probable cause Possible remedy Improperly adjusted foam proportion regu- lating valve ................ Adjust foam metering valve.  (pare 2-13) Improper nozzle Change nozzle. Foam concentrate liquid - supply is diluted or contaminated ............ Drain and flush foam sys- tem.  Fill with concentrate of proper quality.  (pare 2-13) 3-16.    Hose  Reel  Assemblies  Stick  and  Bind  When Reeling or Unreeling Hose Probable cause Possible remedy Insufficient lubrication of hose reel shaft bearings.................... Lubricate as specified in LO 5-4210-213-12. Hose reel assemblies damaged or defective.....Replace hose reel.  (pare 3-88) 3-17.  Hose Reel Assemblies Inoperative Probable cause Possible remedy Motor solenoid relay defective.................... Replace relay (pare 3-88) Probable cause Possible remedy Hose reel switch defective.................... Replace switch (pare 3-67) Hose-reel assemblies damaged or defective.. Replace hose reel (pare 3-88) 3-18.: Siren Inoperative Probable cause Possible remedy Wiring defective ............ Tighten loose connections and replace wiring as necessary (pare -49) Siren hand switch defective.................... Replace defective hand switch (pare 3-50) Defective siren .............. Replace or repair defective siren (pare 3-50) 3-19.  Spotlight or Warning lights Inoperative Probable cause Possible remedy Wiring defective Tighten loose connections and replace wiring as necessary (pare 3-49) Warning light switch defective.................... Replace defective warning light switch (pare 3-68) Rear ILO spotlight......... Replace defective rear ILO spotlight (pare 3-78) Warning light defective . Replace or repair defective warning light (pare 3-52) Spotlight defective ........ Replace defective spotlight (para 3-51). Section VI.  RADIO-INTERFERENCE SUPPRESSION 3-20.  Definitions a. Interference.    The  term  "interference"  as  used herein   applies   to   electrical   disturbances   in   the   radio frequency  range  which  are  generated  by  the  fire  truck and  which  may  interfere  with  the  proper  operation  of radio receivers or other electronic equipment, or enable the enemy to locate the equipment. b. Interference Suppression. The term "interference suppression" as used herein applies to the methods  used  to  eliminate  or  effectively  reduce  radio interference generated by the fire truck. 3-21.        General    Methods    Used    to    Attain    Proper Suppression: Essentially,  suppression  is  attained  by  providing  a  low resistance    and    high-frequency    wires,    grounding    the frame  with  bonding  straps,  and  using  capacitors  and resistors. 3-22.  Interference Suppression Components a. Primary Suppression Components. (1) Capacitors.        The    fire    truck    has    four capacitors   located   on   the   siren,   siren   flasher,   and warning light.  The capacitors are illustrated on figure 3 4. (2) Ground  Strap.    The  unit  has  four  ground straps, two from chassis to frame and one each located on  the  frame  to  hose  motor  assemblies.    The  ground straps are illustrated on figure 3-4 b. Secondary - Suppression Components.    Tooth- type   lockwashers   are   used   to   assure   good   metal-to- metal contact where electrical components are mounted. 3-23.  Replacement of Suppression Components Primary Suppression Components.  Replace radio interference components with new components that are identical.  Capacitors must be 3-10

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