22O SCIENCE OF SUCCESSFUL THRESHING 



box too tight ; 4 belt too tight ; 5 box not in line with 

 shaft ; 6 collar or pulley too tight against end of box ; 7 

 journal rough or shaft sprung; 8 improper balancing of 

 heavy, high-speed parts. In case a box heats, cool with 

 water, clean the oil holes carefully, oil liberally and if it 

 gets hot again, stop and remove the cap, clean the bearing 

 carefully and be sure the oil holes and grooves are open 

 before replacing it. Also be careful to leave the paper 

 liners undisturbed. If the babbitt has adhered to the shaft, 

 because of overheating, scrape every particle of it from the 

 shaft with a knife. If the journal has been cut and is 

 consequently rough because of the formation of ridges, 

 smooth it carefully with a fine file and wipe it thoroughly 

 so that no filings remain. Oil it well before replacing cap. 

 Because of the expansion due to heating, it sometimes 

 happens that a shaft that is cutting becomes fast in its box 

 so that it will not turn. If the box be in one piece so there 

 is no cap to remove, after cooling with water, kerosene 

 may be applied to loosen it. In very windy weather the 

 right cylinder box requires especial attention as the con- 

 stant swaying of the main-belt causes an extra amount 

 of friction on this bearing. 



Greasing the Trucks. This book would be incomplete 

 without a word of warning concerning the damage, fre- 

 quently caused by neglect, to the skeins and hubs of the 

 trucks of an outfit. To make the lubrication of truck- 

 wheels convenient, in some cases, the hubs are provided 



