Gorman-Rupp Pumps PA4A60C-B-E30 575/3 1482736 and up - Manual (Page 22)

OM−06440 PA SERIES
OPERATION PAGE C − 3
Pump Vacuum Check
Read the vacuum gauge with the pump primed
and at operation speed. Shut off the pump. The
vacuum gauge reading will immediately drop pro-
portionate to static suction lift, and should then sta-
bilize. If the vacuum reading falls off rapidly after
stabilization, an air leak exists. Before checking for
the source of the leak, check the point of installa-
tion of the vacuum gauge.
Priming Chamber Discharge Line
Check the priming chamber discharge line for liq-
uid bypass. If bypass occurrs, shut down the
pump. Refer to the Maintenance and Repair Manu-
al, disassemble and clean the float and valve as-
sembly inside the priming chamber.
Liquid Temperature And Overheating
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup-
ture or explode. If overheating occurs, stop the
pump immediately and allow it to completely cool
before servicing it. Approach any over-heated
pump cautiously.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over-
heated pump. Vapor pressure within the
pump can cause parts being disen-
gaged to be ejected with great force. Al-
low the pump to completely cool before
servicing.
Strainer Check
Check the strainer regularly, and clean it as neces-
sary. The strainer should also be checked if pump
flow rate begins to drop. Monitor and record the
vacuum suction gauge readings regularly to detect
strainer blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces-
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.
STOPPING
Manual Stopping
Turn the selector switch on the control box to the
OFF position.
After stopping the pump, lock out and tag out the
control box to ensure that the pump will remain in-
operative.
Automatic Stopping
In the automatic mode, the pump will stop when
the liquid in the wet well or sump lowers and acti-
vates the Off" float switch(s). The pump will restart
automatically when the liquid rises and activates
the On" float switch(s).
PERIODIC CHECKS
Seal And Bearing Cavity Lubrication
Both the seal and bearing cavities were fully lubri-
cated at the factory. Check the lubrication levels
before startup, and regularly thereafter as indi-
cated in the Maintenance and Repair Manual.
When lubrication is required, use only SAE No. 30
non-detergent oil.
Bearing Temperature Check
Bearings normally run at higher than ambient tem-
peratures because of heat generated by friction.
Temperatures up to 160
_F (71_C) are considered
normal for bearings, and they can operate safely to
at least 180
_F (82_C).
Checking bearing temperatures by hand is inaccu-
rate. Bearing temperatures can be measured ac-
curately by placing a contact-type thermometer
against the housing. Record this temperature for
future reference.