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Figure 3-3.  Continued
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TM-5-4210-213-12 Air Conditioner Vertical Compact 6 000 BTU/HR 115 Volt Single Phase 50/60 Hertz Manual
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Foam  Does  Not  Have  Proper  Characteristics for Effective- Use
listing  of  preventive  maintenance  services  which  must be  performed  by  the  operator.    The  item  numbers  are listed    consecutively    and    indicate    the    sequence    of minimum requirements.  Refer to figure 3-2 for the daily preventive maintenance services. 3-7.  Quarterly Preventive Maintenance Services a. This paragraph contains all illustrated tabulated listing  of  preventive  maintenance  services  which  must be performed by organizational maintenance personnel at  quarterly  intervals.    A  quarterly  interval  is  equal  to three   calendar   months   or   250   hours   of   operation, whichever comes first. b. The item numbers are listed consecutively and indicate the sequence of minimum requirements.  Refer to    figure    3-    for    quarterly    preventive    maintenance services. Section IV.  OPERATOR'S MAINTENANCE 3-8.  General Instructions    in    this    section    are    published    for    the information and guidance of the operator to maintain the fire truck. a. Chassis (Government furnished TM 9-2320-209- 10). b. Daily  preventive  maintenance  service  (para  3- 6). Section V.  TROUBLESHOOTING 3-9.  General This  section  provides  information  used  in  diagnosing and correcting unsatisfactory operation or failure of the fire  truck  and  its  components.    Each  trouble  system state  is  followed  by  a  list  of  probable  causes.    Any trouble beyond the scope of organizational maintenance will be reported to direct support maintenance. 3-10.  Fire Pump Capacity Drops Probable cause Possible remedy Engine RPM too low...... Adjust throttle, (pare 3-45) Fire pump loses prime .. Check for air leaks. Submerge suction at deeper supply point. Reprime pump. Fire truck too high to permit pump suction.. Change position of fire truck. 3-11.      Fire   Pump   Fails   to   Deliver   Water   Upon Starting Probable cause Possible remedy Lift required beyond pumps capacity ......... Draw supply from different source or change post tion of fire truck. Water discharge valve closed ....................... Open water discharge valve, Discharge head required higher pump speed.... Increase engine speed. 3-12.    Pump  Clutch  lever  is  Hard  or  Impossible  to Engage Probable cause Possible remedy Improper linkage or clutch adjustment ...... Adjust clutch or linkages as necessary.  (para 3-90) Disconnected, worn, or bent linkage............... Connect, repair or replace faulty parts, (para 3-90) 3-13.  Fire Pump Vibrates or Becomes Noisy Probable cause Possible remedy Cavitation occurring ...... Check suction pressure, re- locate suction strainers when pumping from draft.  Reprime the pump. Pump vapor bound and not fully loaded.......... Temporarily reduce speed or partially close dis- charge valve. 3-14.    Foam  Pump  Fails  to  Deliver  Adequate  Foam Discharge Probable cause Possible remedy Foam concentrate supply is exhausted.............. Refill foam tank.  (pare 2 Foam concentrate tank 13) valve is in closed position ..................... Open valve.  (pare 2-13) Improperly adjusted foam metering valve .. Adjust foam metering valve.  (pare 2-13) 3-9

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