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Fig.  7  Removing Electrically Actuated Water Temperature Gauge
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  13   Components of Instrument Cluster
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 INSTRUMENTS FLEX-PRINTED CIRCUIT One  component  of  instrument  cluster  which  is  integral with  cluster  body  itself  is  the  flexprinted  circuit.    This  tough flexible   plastic   film   is   cemented   to   cluster   body   to   simplify instrument   wiring   (25   electrical   connections   are   replaced   by one).    However,  if  the  need  should  arise  for  electrical  trouble shooting,   individual   circuits   on   the   printed   circuit   are   easily checked.  This is accomplished with cluster removed (Fig.  12). Fig.  12  Checking Printed Circuit Continuity Testing Obtain   SE-2060-4   Test   Light   or   equivalent   tester   and position test probes on a selected circuit in a manner similar to that   shown   in   Fig.      12.      If   test   light   illuminates,   circuit   is unbroken,  or  if  test  light  fails  to  illuminate  circuit  is  broken. Check   each   circuit   in   turn   and   if   a   broken   circuit   is   found, instrument cluster body must be replaced. Replacement Since   printed   circuit   is   cemented   to   and   integral   with instrument cluster body, the printed circuit and cluster body are available for replacement as a complete assembly only.  Where replacement  is  required,  obtain  new  instrument  cluster  body assembly   and   transfer   all   gauges   and   light   bulbs   from   old cluster body to new.  Individual parts of the instrument cluster, available for service, are shown in Fig.  13. SPEEDOMETER The  speedometer  used  on  this  vehicle  indicates  miles and   kilometers   per   hour.      Distance   traveled   is   recorded   (in miles*) on an odometer.  Speedometer is driven by a semi-rigid cable   connected   to   a   set   of   gears   in   vehicle   transmission. Specified gears match the particular truck model anti take into consideration such other factors as tire  size  and  rear  axle  ratio,  The  semi-rigid  cable  which connects  transmission  driven  gear  to  the  speedometer  head consists of an outer case and an inner core.  Odometer records up  to  999,999  miles*  and  returns  to  zero.    School  bus  models record   99,999,9   miles.*   (*Total   metric   speedometers   record kilometers.) SPEEDOMETER ADAPTER Should  the  need  arise  for  changing  a  truck  axle  ratio  or tire  size,  a  corresponding  change  must  also  be  made  to  the speedometer   drive.      This   is   accomplished   by   changing   the speedometer adapter and in some instances the driven gear in the   truck   transmission.      Information   for   finding   the   correct adapter   and   driven   gear   can   be   found   in   the   Speedometer Section of the Parts Catalog. TACHOMETER An electrical or mechanical tachometer (not standard for all  vehicles)  is  also  located  in  the  instrument  cluster  to  record engine RPM (Revolutions Per Minute).  This instrument enables driver to keep engine speed within an efficient operating range. The  mechanical  tachometer  is  driven  by  a  flexible  shaft connected   to   an   adapter   or   driving   unit   located   on   engine (distributor    shaft    for    gasoline    engines    or    air    compressor injection pump, auxiliary shaft, etc.  for diesel engines). The     electric     tachometer     reads     the     same     as     the mechanical unit but receives electrical impulses by wire instead of  rotating  cable.    These  impulses  are  received  from  a  sender unit    mounted    on    the    engine    and    using    the    mechanical tachometer drive take off. SPEEDOMETER AND TACHOMETER CABLES A semi-rigid type cable is used for both speedometer and tachometer on S-Series Trucks. This   cable   consists   of   (1)   an   outer   case   or   cable assembly   with   nut   and   ferrule   at   lower   end   and   a   quick disconnect  ferrule  at  upper  end,  and  2)  a  wire  wound  flexible inner  cable  or  core  assembly  with  squared  drive  at  upper  end and floating tip (Fig.  14) at lower end.  The floating tip which is detachable from cable allows core to float and thereby minimize thrust   on   speedometer   or   tachometer   head.      (Speedometer cable   assemblies   are   sometimes   made   in   two   sections   for assembly purposes.) The cable outer case is formed from an inner nylon liner, an intermediate ply of wire braid and an outer polypropylene or polyethylene case (Fig.  15). CTS-2735  Page 6 PRINTED IN UNITED STATES OF AMERICA

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