AIR COMPRESSORS 



91 



Adjusting the Governor. To adjust the excess-pressure 

 head of the SF-5 governor place the handle of the automatic 

 brake valve in running position, remove the cap nut 25 and 

 turn the adjusting nut 26 until the compression of spring 27 

 gives the desired difference between main-reservoir and brake- 

 pipe pressures. 



To adjust the maximum-pressure head, place the handle of 

 the automatic brake valve on lap, remove the cap nut 17 

 and turn adjusting nut 18 until the compression of the spring 

 19 causes the pump to stop at the maximum main-reservoir 

 pressure required. It is recommended that spring 27 be 



