Gorman-Rupp Pumps 4D-X3 1P - Manual (Page 13)

OM--01515 D SERIES
OPERATION PAGE C -- 2
flow begins to drop. If a vacuum suction gauge has
been installed, monitor and record the readings
regularly to detect strainer blockage.
Accumulator Chamber Check
Check periodically to ensure that there is sufficient
air in the integral suction accumulator chamber.
Replenish as required (see
Fixed, Rigid Piping in
Section B for details).
STOPPING
After stopping the pump, shut off incoming power
to the motor and lock it out to ensure that the pump
will remain inoperative.
If the pump will be idle for more than a few hours, or
if it has been pumping liquids containing a large
amount of solids, flush it with clean water.
Cold Weather Preservation
The primary construction materials of this
pump are aluminum, with neoprene flap
valves and diaphragm. Do not attempt to
clean or flush this pump with any liquid
which would attack pump fittings or com-
ponents. avoid cleaning with cleaning sol-
vent.
In below freezing conditions, drain the water from
the pump and the lines when the pump is not in op-
eration. Also, clean out any solids by flushing with a
hose.
GEARBOX TEMPERATURE CHECK
The gearbox runs higher than ambient tempera-
tures because of heat generated by friction. Tem-
peratures of approximately 200_F (93_C) are con-
sidered normal, and can operate intermittently at
250_F (121_C).
Checking gearbox temperatures by hand is inac-
curate. Place a contact-type thermometer against
the housing and record this temperature for future
reference.
A sudden increase in gearbox temperature is a
warning that the bearings are at the point of failing.
Make certain that the bearing lubricant is of the
proper viscosity and at the correct level (see
LU-
BRICATION in Section E). Bearing overheating
can also be caused by shaft misalignment and/or
excessive vibration.
When pumps are first started, the bearings may
seem to run at temperatures above normal. Con-
tinued operation should bring the temperatures
down to normal levels within 20 minutes or less.