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OIL PRESSURE GAUGE
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  25 Voltmeter Circuit Diagram
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 INSTRUMENTS Fig.  23 Air Pressure Gauge Details Remove 1. Detach instrument cluster and cluster bezel. 2. Unscrew  air  lines  from  fittings  on  rear  of  the  two  air gauge inlets on back of instrument cluster. 3. Remove gauge mounting screws and demount gauges from instrument cluster (Fig.  24). Fig.  24 Removing Air Pressure Gauges 4. Separate individual gauges from bracket. Test 1. If a suspected gauge has been reading high and does not  return  to  zero  when  disconnected,  Bourdon  tube has  been  damaged.    Service  by  replacing  with  a  new gauge. 2. If gauge has been reading low or does not read at all, examine   the   inlet   connection   for   dirt   which   might restrict    air    from    entering    gauge.        Make    a    trial connection and if gauge still does not register correctly, replace gauge. IMPORTANT Always  make  a  comparison  test  with  a  gauge known to be reading correctly before discarding a questionable gauge. Install Installation   of   air   gauges   is   the   reverse   of   removal procedure.  Be sure to use non-hardening sealing compound on fitting  threads  to  prevent  leaks.    Check  installation  so  as  to prevent kinks in air lines. VOLTMETER The   voltmeter   or   battery-charging   system   gauge   (Fig. 25)   indicates   the   condition   of   battery   and   charging   system. This  gauge  will  monitor  a  voltage  range  between  10  and  16 volts.      Color   segments   of   this   range   also   indicate   system condition as follows: GREEN  -  A well charged battery. FIRE ORANGE  -  Either a too high or too low charged battery. With   key   switch   "on"   but   before   starting   engine,   the voltmeter will show condition of battery.  While starting engine, indicator will temporarily descend to "Fire Orange" segment but immediately    return    to    "Green"    segment    when    engine    is operating.      With   engine   running   at   operating   speeds,   the voltmeter indicator should remain in the "Green" segment.  This is   charging   system's   normal   operating   range   and   indicates alternator is charging. If indicator ascends to "Fire Orange" segment, alternator voltage output is too high. Constant    reading    in    either    high    or    low    fire    orange segments of the voltmeter indicates a CTS-2735R  Page 14 PRINTED IN UNITED STATES OF AMERICA

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