24 SCIENCE OF SUCCESSFUL THRESHING 



Starting the "Marsh" Pump. Before attaching the 

 lubricator, it is a good plan to pour some cylinder oil into 

 the pipe. To start the pump, first see that the valve in the 

 feed pipe, between the check valve and the boiler, is open, 

 and that the exhaust lever is thrown towards the steam end 

 of the pump. The steam may now be turned on, and if 

 the piston rod does not move back and forth, tap the 

 starter-pins very lightly. It is well to run the pump with- 

 out water until thoroughly oiled, but as soon as it is run- 

 ning smoothly, the suction-hose end may be submerged. 

 Opening the cock with the thread for attaching the sprink- 

 ling hose or the small air-cock in the water chamber will 

 aid the pump in "picking up" water. 



When the Pump Will Not Start, i. If the pump 

 does not start when steam is turned on, push the starter- 

 pins alternately, to see if the valve moves easily back and 

 forth. If the valve sticks, do not hammer the starter-pins 

 or force them too hard, but remove the valve in order to 

 locate the trouble. This is done by removing the steam 

 chest heads through which the starter-pins pass, and un- 

 screwing the valve, which is done by holding one end while 

 unscrewing the other, by means of the two special socket 

 wrenches furnished for the purpose. If the pump has 

 been idle for a time, the valve may be rusty or gummy, in 

 which case it should be cleaned with kerosene oil. Before 

 replacing the caps, push the valve back and forth as far as 

 it will go and see that it is perfectly free. Also see that 



