156 SCIENCE OF THRESHING. 



Don't tinker with valves that are set properly. 



Don't fail to keep all wearing parts well lubri- 

 cated. 



Don't fail to keep all other parts clean and free 

 from oil. 



Don't run an engine and separator out of line. 



Don't run main drive belt too loose. 



Don't neglect the rig when not in use. 



Don't forget to make the most of your opportu- 

 nities. 



