THE FEED WATER. 23 



replacing the steam chest, see that the packing is in good 

 order. 5 If the pump has been in use some time, or has 

 not been sufficiently oiled, the valve may have become worn 

 and leaky. This is not so likely to occur on the "C" size, as 

 on the smaller pumps. When it does happen, the remedy is 

 a new valve and steam chest. 



Steam End 



Water End 



FIG. 3. SECTIONAL VIEW OF MARSH PUMP. 



When the Pump will not Lift Water. If the pump runs 

 all right when steam is turned on, but will not "pick up" 

 water, opening the drain cock in the boiler feed pipe will 

 relieve the pressure on the discharge valves. I. See that the 

 suction hose and its connections are free from leaks and 

 that the screen is not covered with rags, waste, leaves or the 



