224 SCIENCE OF SUCCESSFUL THRESHING 



To Remove the Shoe. The shoe can be taken out with- 

 out removing the straw-rack or conveyor. Take out the 

 rear rock-shaft, raise the straw-rack and conveyor as high 

 as the deck will allow and secure them in this position. 

 Disconnect the four wood hangers and pitmans and the 

 shoe may then be taken out. 



To Reach the Fan. The lower part of fan housing is 

 readily removed when it is necessary to reach the fan for 

 repairs or other purposes. Take out the bolts holding the 

 end segments and those at the joints on the front and rear 

 of the drum. 



Babbitting Boxes. To babbitt any kind of a box, first 

 chip out all of the old babbitt and clean the shaft and box 

 thoroughly with benzine or gasoline. It is necessary that 

 the box be perfectly clean or gas will be formed from the 

 grease when the hot metal is poured in and thus cause 

 "blow holes." 



A Solid Box may be babbitted in the field by covering 

 the shaft with paper. Draw it smooth and fasten the 

 lapped ends with mucilage. If paper is not used, the 

 shrinkage of the metal in cooling may make it fast so that 

 the shaft cannot be turned. When this happens it is 

 sometimes necessary to put the shaft and box together in 

 the fire to melt the babbitt or else break the box to get it 

 off. Paper around the shaft will prevent this and if taken 

 out when the babbitt has cooled, the shaft will be found 

 to be just loose enough to run well. The shaft is some- 



