PROJECTS IN FARM MACHINERY REPAIR 309 



279. Adjustment of Corn Planter. 



1) Depth Adjust for proper depth by setting the tongue; 

 also, by means of the lever, just in front of the seat. 



2) Width The width of rows can be adjusted by shifting 

 the boxes and shoes as a unit on the frame. Shift the 

 position of the wheels on the axle and move the wheel 

 scrapers accordingly. 



3) The Drop the drop is changed by moving the lever to 

 point indicating two, three or four grains per hill. 



4) Drilling Most planters can be adjusted to drill by open- 

 ing the valves and holding the trip back. A lever is often 

 provided so that the change to drilling can be made from 

 the seat. 



5) Accuracy Proper plates should be selected for the par- 

 ticular seed and the accuracy of drop tested before the 

 planter is taken into the field. If the plates are of the 

 type where one kernel is selected at a time, try out sev- 

 eral by taking some kernels of corn and fitting them into 

 the spaces. If they do not fit are too tight or too loose 

 try other plates until one is found that fits fairly well. 

 Place this plate in position in box, partially fill it with 

 the corn to be planted, place the planter on a stand or 

 saw horses, and you are ready for test. Set the lever to 

 position of number of grains to be dropped at each hill. 

 Trip clutch and turn drive wheel; catch the grains as they 

 drop out at each hill and count them. Trip for 100 hills ; 

 if lever is set for three grains, it should test at least 90 

 per cent accuracy. Out of 100 hills, if there are 60 threes, 

 30 twos, 8 ones and 2 fours, a plate should be selected 

 with slightly larger openings. The correct selection of 



