24 SCIENCE OF SUCCESSFUL THRESHING. 



like. If this hose has been in use for some time, see that 

 it is sufficiently firm not to collapse or flatten, and that its 

 rubber lining has not become loosened so as to choke or stop 

 the water supply. 2. Remove the air chamber and look for 

 dirt under the water valves. 3. If the pump has been in 

 use for a time the water-piston packing may leak. Where 

 dirty water is used, this packing must be frequently renewed. 

 Directions for re-packing are given below. 



When the Pump almost stops after lifting water, the 

 trouble is in the delivery or feed pipe. Opening the cock 

 in this pipe will relieve the pressure and allow the pump to 

 run faster. Possibly the angle valve near the boiler has 

 been left closed. The check valve in the feed pipe should 

 be examined, for which purpose the angle valve, between 

 it and the boiler, can be closed. If nothing be found, the 

 stem should be removed from this angle valve, and probably 

 the pipe will be found nearly filled with lime at the point 

 at which it enters the boiler. This may be cleaned by 

 driving a bolt into it. Of course, the angle valve stem 

 can only be removed when the boiler is cold. 



Packing the Pump. The successful operation of this 

 pump depends very much upon the manner in which it is 

 packed. In renewing the water piston packing, do not com- 

 press the packing too much. It should be reduced, if too 

 thick. When properly packed, the piston may be readily 

 moved by hand. The nut on the end of the piston rod 

 should be tightened to bring the follower to place. The 



