... maintenance·The use of full-sealed maintenance-free bearingsRotation directionTFW2 series alternator adopt a one-way rotating fan design, the ... of 40°C and altitude less than 1000m above sea level*All alternator are 4-pole ones *Extended range voltage ... with bell, single, double fulcrum optional, brushless excitation, AVR automatic voltage regulator, insulation, such as H-class, steel chassis stable ...