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14081_95
Auxiliary  Lights

Equipment Operator Basic - Beginning construction equipment operators manual
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good rule of thumb to remember is, if a light is on a vehicle, the light must work and be safe. Lamps  and  Bulbs Trucks and buses are lit up like Christmas trees when operating at night. In addition to the headlights and taillights, which are the minimum running lights required bylaw for all vehicles operating at night, trucks and buses must also have clearance and side marker lights. These lights outline the length, height, and width of the vehicle. Each  group  of  lights  in  a  branch  circuit  of  the lighting system is protected by a fuse or circuit breaker and is provided with a switch. Each light in the group is provided with one or more light bulbs that are rated for the particular circuit. Light bulbs used in Navy equipment are made to operate  on  a  low-voltage  current  of  12  or  24  volts, depending  upon  the  voltage  of  the  battery  system  used. Bulbs are rated as to size by the candlepower of light they   produce.      They   range   from   small   one-half candlepower  to  large  50-candlepower  headlight  bulbs. The greater the candlepower of the bulb, the more current it requires when lighted. Bulbs are identified by a number on the base. Operators  are  responsible  for  replacing  burned-out bulbs on equipment. Manufacturers  have  designed bulbs with such a wide variety of designs (fig. 4-4) that it is impossible to list all the bulbs here. A bulb design commonly used has either single or double contacts with nibs to fit bayonet sockets, as shown in figure 4-5. Because of some unique designs, certain bulbs have to be handled with care; for example, quartz bulbs should not be touched by the oil in your skin, because the oil causes the bulb to fail instantly. Because of the unique characteristics  of  the  various  bulbs,  you  should  check the  operator’s  manual  before  replacing  any  bulbs. The sealed beam light is actually a large bulb (fig. 4-6). The bulb consists of a lens, filaments, and a glass reflects. Sealed bulbs also have various designs; some have filaments designed for high beam, some with one filament designed for low beam, and bulbs with two filaments designed for high and low beam. Clearance Lights Clearance lights detail the maximum width of the vehicle, not necessarily its height as the word clearance implies. These lights highlight the protruding unlighted front and rear corners of the vehicle that are subject to Figure 4-4.—Bulbs. Figure  4-5.—Single-  and  double-contact  bulbs. collision  with  other  vehicles  or  persons,  not  the  top  of the vehicle. Clearance lights should be mounted at a height best suited to allow them to be readily seen from a minimum distance of 500 feet from the vehicle. The clearance light on the front of a vehicle should be amber in color, and those facing the rear red. Some state regulations require that larger vehicles have  identification 4-4







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