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SPEEDOMETER, TACHOMETER AND CABLE TROUBLE SHOOTING
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  17 Fuel Gauge Circuit Diagram
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 INSTRUMENTS 2. Feed  the  core  (lower  end  first)  through  the  lube  and into casing. 3. Keep  last  four  inches  of  cable  free  of  lube  to  prevent lube from entering the instrument head. 4. Install    complete    cable    assembly    in    chassis    and connect in reverse order of "Removal" procedure. IMPORTANT Avoid sharp bends when installing speedometer or tachometer cables.  Under no circumstances should a casing have less than a six-inch radius bend.        Route    tachometer    cable    away    from compressor discharge line and strap to stay rod to avoid cable damage. GAUGE OPERATION TROUBLE SHOOTING Except  for  air  pressure  gauges  which  are  mechanical-- Bourdon  tube  type--all  gauges  are  of  the  electro-magnetic  air core  type.    In  each  system  to  be  monitored  (Fuel  Level,  Oil Pressure,  Water  Temperature,  etc.)  a  sender  uses  a  variable resistance  to  control  current  from  the  battery  through  a  coil  or coils in the gauge. Gauge Tester To assist in checking the electrical indicating type gauges a  simple  test  procedure  using  a  universal  type  Gauge  Tester SE-2781   (Fig.      16)   is   suggested.      This   testing   instrument eliminates time consuming trial and error methods of checking out the gauges. IMPORTANT To insure full power to all instruments in cluster, connector  lock  tabs  on  both  sides  of  harness connector, must be solidly engaged with cluster socket. Proper connector insertion and power to cluster is assured if the following indicators react when key switch is turned on: 1.  Voltmeter pointer moves up scale. 2.  Warning lights (except Anti-Lock) come on. With  power  to  cluster  off,  gauge  pointers  may move   to   any   point   on   gauge   scale.      This   is inherent  to  instrument  and  does  not  indicate  a faulty part. Fig.  16 Gauge Tester (SE-2781) Test Application Gauges can be tested on vehicle, without detaching them, by removing sender to gauge wire at sender unit and connecting in the SE-2781 Gauge Tester.  Test continuity on gauge circuits with  the  SE-2060-4  Test  Light.    Details  of  this  procedure  are covered in later paragraphs. FUEL LEVEL GAUGE The   electric   fuel   gauge   system   consists   of   two   basic components--the   instrument   cluster   mounted   gauge   and   the fuel tank sending unit.  The tank unit controls the gauge and the gauge  registers  the  quantity  of  fuel  in  the  tank.    The  two  units are connected electrically as shown in Fig.  17. This air core type fuel gauge consists of three (3) copper wire  coils  wound  around  a  plastic  bobbin  containing  a  magnet and  spindle  assembly.    Attached  to  the  magnet  and  spindle assembly is a pointer which indicates fuel level.  The fuel gauge requires   a   0   to   90   ohm   resistance   sender   to   operate.      The sender is the tank unit and consists of a float and arm assembly and a variable resistor.  The sender's resistance is controlled by the position of float and arm assembly.  A full fuel tank raises float to its highest position.  At this position the variable resistor has a resistance of 88 ohms.  With an empty fuel tank the float assumes  its  lowest  position,  creating  a  sender  resistance  of less than 1 ohm. The  fuel  gage  circuit  diagram  (Fig.    17)  shows  that  with key   switch   "ON",   current   flows   from   the   battery   through   a parallel circuit consisting of the empty coil and the fixed resistor and thence through another circuit composed of: - the variable resistance fuel level sender and the bucking coil and the full coil. CTS-2735  Page 9 PRINTED IN UNITED STATES OF AMERICA

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