Gorman-Rupp Pumps 81 1/2D3-X1 1P 326949 and up - Manual (Page 15)

80 SERIES OM−00759
OPERATION PAGE C − 3
Before checking for the source of the leak, check
the point of installation of the vacuum gauge.
STOPPING
After stopping the pump, disconnect the incoming
power to the motor and lock it out to ensure that the
pump will remain inoperative.
Do not operate the pump against a
closed discharge throttling valve for
long periods of time. If operated against
a closed discharge throttling valve,
pump components will deteriorate, and
the liquid could come to a boil, build
pressure, and cause the pump casing to
rupture or explode.
Cold Weather Preservation
In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out any
solids by flushing with a hose. Operate the pump
for approximately one minute; this will remove any
remaining liquid that could freeze the pump rotat-
ing parts. If the pump will be idle for more than a
few hours, drain the pump, and flush it thoroughly
with clean liquid. Operate the pump during the
draining process.