148 SCIENCE OP SUCCESSFUL THRESHING 



chine on the straw-rack, conveyor and fan, then turn each 

 shaft by hand a few revolutions to make sure there is noth- 

 ing loose or misplaced. Be sure that the two bolts, one 

 on each side, which fasten the conveyor-extension to the 

 conveyor side-rails are perfectly tight ; otherwise, this ex- 

 tension will immediately begin to hammer itself and other 

 parts to pieces. After the machine has been run awhile, 

 take time to go over the bolts in the straw-rack, especially 

 those holding the straw-rack extension to the straw-rack 

 proper. Any attention paid to keeping bolts tight in vi- 

 brating parts is time well spent. 



Oiling. The oil boxes should be carefully cleaned of 

 cinders and dirt that may have collected during shipment, 

 and the paint removed from the oil holes. Screw down 

 the plugs of the grease cups on beater, fan and crank boxes 

 to the end of the threads, using a wrench, if necessary, to 

 clean off the paint. Fill the grease cups on beater, fan 

 and crank boxes with hard oil and fill oil cups on cylinder 

 boxes with a good lubricating oil. It is best to first place 

 a small quantity of wool or cotton waste in the bottom of 

 each oil-cup. Connect the separator with engine or other 

 power, running only the cylinder for a time, and feeling 

 of the boxes to ascertain whether they show any tendency 

 to heat. While the cylinder is running, oil both ends of 

 the crank pitmans, and the four bearings of the rock shafts. 

 Take off the tightener pulley from its spindle, clean the 

 spindle and its inside oil-chamber and holes, and oil the 



