56 SCIENCE OF SUCCESSFUL THRESHING 



made tight with a piece of sheet-iron touching the shaft. 

 This may be held by means of the bolts which secure the 

 cap. Putty should then be used to make the ends and all, 

 tight against leakage, but the babbitt must be allowed to 

 run against the hub of the disc in order that end-play of 

 the shaft may be prevented. An opening in the form of 

 a funnel of putty should be made at each end of the box at 

 the top. The babbitt may be poured through the larger 

 of these while the one at the other end of the box allows 

 the air to escape. After the lower-half and cap of bearing 

 have been poured, the shaft should be removed so that the 

 babbitt may be examined, oil-holes opened, oil-grooves cut 

 and the babbitt scraped if necessary to properly fit the 

 shaft. It is usually best to relieve the bearing as explained 

 elsewhere. 



To Babbitt Upper Cannon Bearing. Jack up right- 

 hand side of boiler, and block under tank or platform 

 frame. Remove right-hand traction- 

 wheel; take pin out of collar and pull 

 off right-hand counter-shaft pinion; 

 then the differential spur-gear and cen- 

 ter-wheel. Drive out key and remove 



uv 



>. 



FIG. ib. tne left-hand counter-shaft pinion. Pull 



out the counter-shaft, and remove can- 

 non-bearing after slipping off links. 



Chip out all old babbitt, and remove any grease or grit 

 that may adhere to the casting. Fill the key-way in the 



