The governors are available with either a cast-iron case or a die-cast aluminum case. 

Speed droop is required for stable governor operation. Droop is factory set, but internally adjustable. 

Two means of speed setting are available. Screw speed setting is standard. Lever speed setting is 

optional and provided by a serrated shaft assembly extending from both sides of the cover. 

Governor drive shaft rotation for both governors is single direction only. In both the cast iron and the die

cast aluminum governors, rotation can be changed in the field. In the cast iron governor, it must be 

changed internally, and in the die-cast aluminum governor, it can be changed externally by removing

four screws and rotating the pump housing 180 degrees (see Chapter 2). 

Governor maintenance is minimal due to few moving parts, weatherproof design, and self-contained oil 

supply. The governor drive shaft operates a gerotor oil pump. Internal oil pump pressure is regulated by

a relief valve/accumulator. The oil sight gauge installed on each side of the governor case makes oil 

condition and oil-level checking simple.