PROJECTS IN FARM MACHINERY REPAIR 319 



the center band. When cylinder is put back in place, 

 adjust to the bearings so there is no lost motion. It 

 should make a snug fit, but should not bind. Avoid too 

 much end play. The thickness of wrapping paper at 

 each end of cylinder will be sufficient. 



2) Concaves Replace badly-worn concave teeth. Be care- 

 ful to avoid breaking the concave bars. Adjust the con- 

 caves so the teeth are centered as far as the cylinder 

 teeth are concerned. If the concave and cylinder teeth 

 come closer together than 1/8", cracking of grain is liable 

 to result. Teeth that are out of line or bent should be 

 brought back into place by the use of a hammer. In- 

 spect the device for raising and lowering the concaves. 

 If badly worn, put in new parts. 



3) Separating Grates See that all bolts are tight and there 

 is no loss motion. Straighten all bent rods or bars. See 

 that all parts work without undue friction. 



4) Feeding Attachment Inspect the frame for looseness, 

 badly-worn or split parts. Tighten all bolts and screws. 

 Tighten the carrier chain; see that slats or canvas is in 

 good repair. Examine band cutter knife; replace it if it 

 is broken or badly worn. See that all bolts are tight and 

 bearings are in good condition on retarder and shaking 

 feed bottom. 



4) Beaters and Apron See that there is no play or lost mo- 

 tion in the beater. If the blades are wood, replace those 

 that are split or badly worn. See that there are no 

 rough surfaces on the blades. See that apron or check 

 board works freely. 



