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Figure 25  EVM Governor Operation
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Figure 27  Exploded View of Carburetor (Typical)
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL Redundant Throttle Closing Linkage The model 4150G carburetor, appearing on vehicles produced    after    September    1,    1973,    are    equipped    with redundant throttle closing linkage as an added safety feature. The purpose of this redundant linkage is to return the throttle to the idle position in the event throttle return spring becomes disconnected or linkage breaks. The  redundant  linkage  consists  of  a  safety  spring, trip  lever,  retaining  lever  and  throttle  lever  as  shown  in  Fig. 26.    Under  normal  operation  the  safety  spring  is  held  in  a coiled (loaded) position by the notch in the retaining lever and tab  of  the  trip  lever.    The  throttle  return  spring  supplies  the force  necessary  to  keep  the  notch  and  tab  engaged.    In  the loaded  position,  the  throttle  lever  may  be  operated  with  the usual restraining force of the throttle return spring. Figure 26 Redundant Throttle Closing 1.  Spring 2.  Notch and Tab Engaged If  the  throttle  return  spring  becomes  disconnected, the notch and tab will become disengaged allowing the force of  the  loaded  safety-spring  to  snap  the  throttle  to  the  idle position.  Although vehicle may be driven in this condition, the redundant throttle closing linkage should be reloaded as soon as possible CAUTION: Additional care should be exercised    when    servicing    4150    model carburetors equipped with redundant throttle   closing   linkage.      Whenever   the throttle   return   spring   is   disconnected   at either    end,    the    throttle    linkage    at    the carburetor  will  snap  to  a  closed  position under   a   spring   force   sufficient   to   cause personal injury.  It is essential, to prevent personal   injury,   that   all   instructions   be followed in the stated order and hands be kept   clear   of   carburetor   throttle   linkage when    connecting    or    disconnecting    the throttle return spring. Special Tools The    overhaul    procedure    which    follows    can    be accomplished   with   ordinary   tools.      However,   the   use   of carburetor tool set SE-1772 is strongly recommended.  Use of the  tools  in  this  set  not  only  protects  parts  which  ordinary tools might damage, but also saves time as well. CGES-125-T  Page 18 PRINTED IN UNITED STATES OF AMERICA

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