12 SCIENCE OF SUCCESSFUL THRESHING. 



be made for a trip on the road. To do this, the trunnion-ring 

 of the friction-clutch should be oiled and the shoes adjusted 

 to properly engage the rim of the fly-wheel. Any paint that 

 may be on the long hub of the arm should be scraped off to 

 allow the free movement of the ring, which slides thereon, as 

 the clutch is thrown in or out of engagement. All the trac- 

 tion gearing should now be greased, and a quantity of oil 

 poured into the cannon-bearings. Next the stud of the inter- 

 mediate gear, the bevel pinions of the differential gear, and 

 the bearings of the steering-roller and hand-wheel shaft 

 should be oiled. The steering-chains should be properly 

 adjusted as elsewhere explained. 



Caution. A new engine should have close attention for 

 the first few days until the bearings become smooth. The 

 engine has been run in the testing-room at the factory, and 

 it is probable that the bearings are properly adjusted. How- 

 ever, they should be felt of at short intervals, and should 

 one of them heat to any extent, it will be best to loosen it a 

 little. A fast run should not be attempted the first two or 

 three trips on the road, but the engine should be allowed 

 to run below its normal speed until bearings are smooth and 

 the operator becomes accustomed to handling the engine. 

 During the first few days, it is necessary to use three or four 

 pints of cylinder oil in ten hours in order to keep the valve 

 and cylinder well lubricated. Afterwards the amount may be 

 lessened, but it is essential that cylinder oil be fed continually. 



