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Section XVII.  MAINTENANCE OF CAB ASSEMBLY, LIGHTS, SWITCHES, GAUGES, CONTROLS AND INDICATORS
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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FRONT CLEARANCE LIGHT MAINTENANCE
TM5-4210-229-14&P 4-94.  HEADLIGHTS MAINTENANCE  (Continued ) ADJUSTMENT NOTE Place the vehicle 25 feet (7.6 meters) from a vertical wall or structure with the front of the vehicle at a 90 degree an- gle to the wall or structure. a.   Measure   the   height   from   the   ground   to   the center of the headlight. b.   Measure  the  distance  from  the  center  of  one headlight to the other. c.   Transfer   these   measurements   to   the   wall   or structure  and  mark  them  accordingly  with  two cross-marks, directly in front of the headlights. d.   Turn   on   the   headlights   and   switch   to   high beam. e.   The focal hot spot of each headlight should be centered 2 inches (51 mm) below the junction of the vertical and horizontal marks. f.   To  raise  the  light,  turn  the  vertical  adjusting screw  (1)  clockwise.    To  lower  the  light,  turn the  vertical  adjusting  screw  (1)  counterclock- wise. g.   To turn the headlight to the left or vertical, turn the   horizontal   adjusting   screw   (2)   clockwise. To  turn  the  headlight  to  the  right  of  vertical, turn the horizontal adjusting screw (2)  counter- clock-wise. REMOVAL a. Remove four retaining screws (3) and remove headlight bezel (4). b.   Remove three retaining screws (5) and remove sealed beam unit retaining ring (6). c.   Pull  sealed  beam  unit  from  headlight  assem- bly.    Disconnect    three-way    wiring    connector (7)from  rear  of  sealed  beam  unit  (8)  and  re- move sealed beam unit (8). REPAIR Repair consists of replacing defective sealed beam unit (8) or bezel (4). INSTALLATION a.   Connect three-way wiring connector (7) to new sealed beam unit (8). b.   Position sealed beam unit (8) in mounting ring. Install retaining ring (6) and secure with screws (5). CAUTION Do  not  overtighten  bezel  retaining  screws. Overtightening could cause damage (stripping) of threads in hood fender). c.   Install   headlight   bezel   (4)   and   secure   with screws (3). d.   Connect battery cables. e.   Check light operation. 4-107

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