21. Q. After filling lubricator, what should be done?
A. Open the steam throttle to the lubricator wide, then carefully open the water valve, but do not open the feeds until sure the chamber in the glass is filled with water.
22. Q. How long before leaving terminal should the feed valves be opened? Why?
A. About fifteen minutes; this time is necessary to allow oil to feed through the oil pipe and reach the steam chests.
23. Q. How many drops should be fed per minute?
A. From one to seven, timed by the watch, depending on conditions. Cylinders of large size require more oil than smaller ones.
24. Q. If lubricator feeds regularly when working steam and too rapidly after shutting off, what is the trouble?
A. The opening in the choke plug at the lubricator or through the steam valves at the steam chest is too large and should be reduced to the proper size by applying new chokes or valves.
25. Q. When valves appear dry while using steam and the lubricator is working all right, what would you do to relieve these conditions?
A. Ease off throttle for a few seconds to reduce the steam chest pressure and drop the reverse lever a few notches to give the valve a longer travel; oil held in the pipes will then flow down.