74 



SCIENCE OF SUCCESSFUL THRESHING 



VALVE STEM 



STUFFING BOX 



bunch remains to cause an uneven working of the gov- 

 ernor. The belt should be sufficiently taut to prevent 

 slipping, but not so taut as to cause undue friction. 



The belt should be kept free from excessive oil or 

 grease from other parts of the engine. This may be wiped 

 off with a clean cloth moistened with a little kerosene or 

 benzine and afterwards wiped again with a dry cloth. 



Governor Troubles. If the governor "jumps" or is 



irregular, it is probably 

 occasioned by one of the 

 following causes : First, 

 because the valve is a lit- 

 tle tight; second, be- 

 cause the valve-stem is 

 bent; or, third, because 

 the stuffing-box nut is 

 screwed down too tight- 

 ly. Turning the valve- 

 stem up and down 

 while the governor is 

 running, will show 

 whether the valve works 

 freely in its seat. If it 

 binds at all, take it out, and rub it with a fine emery cloth, 

 but never attempt to file it. In taking the governor apart, 

 the top must be lifted off as "true" as possible, so as not to 

 bend the valve-stem. If the valve-stem becomes bent 



FIG. 21. SECTION OF WATERS 

 GOVERNOR VALVE. 



