SCIENCE OF SUCCESSFUL THRESHING. 



to produce equal tension on both shoes, or undue friction 

 will be produced on the sliding ring making the lever hard 

 to handle. A good way to adjust the turnbuckles is to apply 

 a large wrench to them, when the clutch is in engagement, 

 and lengthen the toggle levers until the shoes are pressed 

 hard against the rim. In this manner, the shoes can be given 

 equal and sufficient pressure and when the clutch is drawn 

 out of engagement, the shoes will clear the rim. Of course, 

 the jam-nuts must be loosened before adjusting and tight- 

 ened afterwards. The inside end of the fly-wheel hub should 

 touch the end of the clutch sleeve, or the sliding ring cannot 

 carry the toggle levers beyond the straight line. The 

 wooden shoes are easily replaced when worn out. 



Examine the clutch and see 

 that it is properly adjusted be- 

 fore starting up or down a very 

 steep hill. If it be in good order, 

 it will not fail to do its work. 

 Oiling the Clutch. When the 



engine is traveling the entire 

 FIG. 32. 



clutch moves together with the 



SECTION OF CLUTCH-ARM 



AND RINGS. 'exception of the trunnion- 



ring. This, then, should be oiled when the engine is on the 

 road. When threshing, the clutch remains stationary, while 

 the shaft revolves within it. The long sleeve should then 

 be oiled and also the end of the fly-wheel hub where it 

 comes in contact with the end of the sleeve. There are 



