304 FARM MACHINERY REPAIR 



6) Scrapers Replace if badly worn. See that they come 

 in contact with disc without causing undue friction. 



7) Snubbing Blocks Adjust so gangs run level. 



8) Levers Straighten bent levers. Replace worn parts. 



9) Draft Connection If worn, renew. 



Adjustment Change angle of disc to increase or de- 



Levers for 



Angling Gangs 



Spring 

 Pressure 



Lever /Scraper Gang 



Lever Frame 



Grease 

 Cup 



FIG. 318. Disc harrow. 



crease amount of suction. Weighting is sometimes re- 

 sorted to in hard ground to increase the depth. 

 275. Repair and Adjustment of Planting Machinery. 



Requirements: To repair and adjust ready for field use plant- 

 ing machinery such as used in the particular locality. A 

 corn planter and drill are outlined. 



Preliminary Instruction: Every planting machine should be 

 in first-class repair when taken into the field, to avoid a 

 poor stand due to its poor condition. 



