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On the Vehicle Test
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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1969 specification (manual choke)
highway     and     check     governor     operation.          The governor   should   limit   engine   speed   to   3600   RPM plus 150-250 RPM initial overrun.  If the engine does not govern, disconnect the secondary throttle diaphragm   link   from   the   secondary   throttle   shaft lever.  Operate the vehicle again on only the primary carburetor venturis.  If the engine governs now, the problem is in the secondary control valve.  Some 4150G carburetors will be equipped with a secondary throttle diaphragm assembly air filter.  If the air filter becomes    clogged    the    governor    will    not    operate properly.      To   check   the   filter   for   restriction,   blow through   filter   tube.      If   air   does   not   pass   freely, replace filter. NOTE:  Check  air  filter  every  24,000  miles  or  24 months    whichever    occurs    first.        In    vehicles operated   in   dusty   conditions,   check   for   filter restrictions more frequently . Correct operation of the secondary throttle system and the governor depends upon proper functioning of the secondary control valve.  Use of the test procedures described will assist in diagnosing governor problems and checking secondary control valve operation. CGES-125-T Page 45 PRINTED IN UNITED STATES OF AMERICA

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