250 AGRICULTURAL ENGINEERING 



If the needle has become bent or the pitman which 

 actuates it worn until the needle does not place the twine 

 squarely over the notch in the twine holder, a loose band 

 will be produced as shown in No. 5, Fig. 155; that is, there 

 will be a knot in one end, and the other end will be cut off 

 squarely but without a kink in it. 



If the needle of the modern binder becomes slightly 

 bent, it may be hammered back without fear of breakage. 



QUESTIONS 



1. Why is the grain binder an important machine? 



2. In what sizes are grain binders manufactured? 



3. What are the important features involved in the selection of the 

 grain binder? 



4. To what use may the tongue truck be put? 



5. When may the machinery of the harvester be driven with a 

 gasoline engine to good advantage? 



6. To what purpose should the binding mechanism of the harvester 

 be adjusted? 



7. How should the elevator rollers, main and elevator chains be 

 adjusted on a binder? 



8. What adjustment should be made to change the size of the 

 bundles? 



9. Explain five causes for failure of the knotter to tie a knot. 



