FARM MOTORS 



the throttle valve should be closed, the engine reversed, 

 then the throttle opened. Traction engines are usually 

 made strong enough so they will stand the strain of 

 being reversed without closing the throttle. This, how- 

 ever, is hard on the bearings, and the engineer should 

 always close the throttle before reversing the engine, 

 especially if the engine is running at full speed. 



599. Setting an engine. A new engineer will expe- 

 rience some difficulty in setting an engine so it is prop- 

 erly lined with the separator. On a still day the belt 

 wheel of the engine should be in line with the separator. 

 This is also true when the wind is blowing in line with 

 the engine and the separator. But if the wind is at an 

 angle allowance will have to be made for the amount 

 which it will carry the belt to one side. Often the en- 

 gine will have to be set a few feet out of line with the 

 separator and toward the wind. If the engine has been 

 set when there is no wind and enough wind comes up to 

 throw the belt over, it is not necessary to stop the en- 

 gine and move, but a jack screw can be set against the 

 end of the front axle and the engine worked over toward 

 the wind. Also the front end of the separator should 

 be crowded in a similar manner until the belt runs in 

 the proper position on the pulley. The friction clutch 

 should always be used in backing the engine into the belt. 



600. Gasoline traction engines. Since the gasoline 

 traction engine requires no boiler, the engine with its 

 necessary accessories, such as water tanks, gasoline tanks 

 and battery boxes, is mounted upon a frame. Conse- 

 quently the mounting of a gasoline engine is more simple 

 than that of a steam engine. However, it has a disad- 

 vantage which the steam engine does not have ; that is, 

 the engine itself cannot have its direction of rotation 

 reversed without a great deal of trouble, consequently 



