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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  44  Pellet Type Controlled Air Cleaner
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 b. With  engine  off,  inlet  tube  damper  should  be  in  full down   position   to   close   heat   tube   inlet   pipe   from exhaust  manifold  stove.    Damper  position  can  be determined by looking in end of inlet tube.  If damper assembly   is   not   in   the   correct   position,   vacuum chamber should be removed and damper movement loosened.  Replace vacuum chamber (located on top of inlet tube) and recheck damper position. Fig.  42  Vacuum Chamber Details To  replace  vacuum  chamber  (Fig.  42)  (cannot  be replaced   on   air   cleaners   used   on   4-196   engines) bend   tab   nearest   inlet   tube   entrance   down   from inside    tube.        Disconnect    vacuum    hose    and    lift vacuum  chamber,  sliding  the  rear  tab  out  of  its  slot disengaging damper hook from damper.  Attach new chamber  by  engaging  hook  in  damper,  sliding  rear tab  into  its  slot  and  fitting  front  tab  into  place.    A spring preload should be felt when vacuum chamber is  pressed  firmly  against  top  of  inlet  tube.    If  no preload is felt, check the installation or be sure parts are   not   faulty.      Press   front   vacuum   chamber   tab firmly  against  tube  inside  surface.  Connect  vacuum hose. c. Start engine and note that damper has rotated up to close off cold air inlet.  Observe damper position by looking    in    the    inlet    tube.        If    damper    did    not immediately close cold air inlet, proceed as follows: (1)    Shut   off   engine   and   disconnect   the   two   hoses   from sensor. (2)    Connect   the   two   hose   ends   together   using   suitable tubing. (3)    Restart   engine   and   again   check   damper   location.      If damper  fully  closes  cold  air  inlet,  temperature  sensor  is defective and must be replaced (located inside air cleaner body). Fig.  43  Sensor Installation To    replace    temperature    sensor,    disconnect    two vacuum  hoses  attached  to  sensor  inlet  and  outlet tubes  on  underside  of  air  cleaner  body.    Remove clamps or speed nuts from tubes and lift sensor from body.    Position  new  sensor  and  gasket  inside  air cleaner  body.    Firmly  press  two  new  speed  nuts  or clamps  on  tubes  to  hold  sensor  in  place.    Attach vacuum hoses to sensor tubes.  If damper does not close  cold  air  inlet,  sensor  is  okay,  but  damper  has bind   or   vacuum   chamber   is   defective.      Remove vacuum    chamber    and    check    damper    for    free movement.  If damper moves freely, replace vacuum chamber. d. After  cold  start,  operate  engine  for  10  minutes  at medium RPM.  When engine is at normal operating temperature, slow CGES-215  Page 25 PRINTED IN UNITED STATES OF AMERICA

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