Packing Gland (Stuffing Box) stuff′ing box noun A device for preventing leakage of gases or liquids along a moving rod or shaft at the point at which it leaves a cylinder, tank, ship hull, etc. Also called gland. [1790–1800]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved. Under the cover you will see the reciprocating shaft. One end goes to the aligning rollers driven by the motor; the other end is connected to the neoprene cylinder cups inside the cylinder. The pump uses 2 pieces of 1/8” square packing about 1 3/8” long. There’s a brass nut that compresses the packing to achieve a seal. THIS NUT SHOULD ONLY BE FINGER TIGHT!!!!
Tighten just snug enough to prevent leaking, not so tight that it restricts motion of the piston rod. Over tightening will only cause premature wear. In fact, a small amount (a few drops) of water leaking from this gland are just fine. Note the series of holes drilled into the base right below the gland to accommodate this leakage.
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