198 SCIENCE OF SUCCESSFUL THRESHING. 



should be taken up or rebabbitted if necessary. The wooden 

 boxes on the straw-rack, conveyor and shoe eccentrics can 

 easily and cheaply be replaced when worn out. All nuts 

 that are loose should be tightened and any bolts that may 

 have been lost, replaced. In tightening a nut it should 

 always be turned; square with the piece pn which it rests. 

 If this be habitually done, not only does the machine look 

 better, but it serves to make the loosening of a nut apparent. 



Canvas-Cover. If a canvas be used to cover the separa- 

 tor nights and when not running during the threshing 

 season, its appearance will amply repay the extra trouble 

 and expense, in addition to prolonging its usefulness. 



In Laying up the Machine see that the bolster is blocked 

 up by bolster-jacks or other means- so as to hold the frame 

 square. This is especially necessary if the separator has a 

 side-gear, if the main-belt remains on the reel, or, if for 

 other reasons, one side is heavier than the other. 



Removing the Beater. The beater can be taken out of the 

 machine without removing the shaft or pulley. This may be 

 done on wood-frame machines by removing the pieces of 

 siding and the bolts holding bearings and blocks and lifting- 

 the beater straight up. On steel machines the girt and 

 circular piece of sheet-steel on the left-hand side are removed 

 and the beater taken out through the hole thus created. 



To Remove Rock-Shafts. The rock-shafts are enlarged 



at one end so that when the set-screws are loosened, they 







may be readily removed. The front rock-shaft is straight 



