Gorman-Rupp Pumps PAH4C60-6068H 1532412 and up - Manual (Page 18)

OM-06476 PAH SERIES
OPERATION PAGE C - 4
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
Never halt the flow of liquid suddenly. If the liquid
being pumped is stopped abruptly, damaging
shock waves can be transmitted to the pump and
piping system. Close all connecting valves slowly.
In the manual mode, reduce the throttle speed
slowly, and allow the engine to idle briefly before
switching the engine key switch to `OFF'.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
After stopping the pump, switch off the engine igni­
tion and remove the key to ensure that the pump
will remain inoperative.
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).
Safety Shutdown System
The unit is equipped with a safety system to auto­
matically shut down the engine under certain con­
ditions. The engine will automatically shut down:
1. If the engine exceeds its safe operating tem­
perature.
2. If the engine oil pressure drops below design
limits.
3. If the engine fails to start within a pre‐set peri­
od of time.
4. If the engine speed exceeds the safe operat­
ing range.
5. If the engine fan belt breaks.
Lights on the control panel will indicate which of the
safety features has caused the engine to shut
down.
Should any of the safety features cause the engine
to shut down, the cause must be determined and
corrected before putting the unit back into service.
The engine will not restart until the key switch has
been returned to the `OFF' position for at least 10
seconds.
All safety shutdown features are pre‐set at the fac­
tory for optimum performance and safety; do not
attempt to adjust these settings.
Never disconnect any of the safety shut­
down features; this will void the warran­
ty and could result in serious damage to
the unit and/or injury to personnel. Safe­
ty shutdown features are pre‐set at the
factory; do not attempt to adjust any of
the settings. Determine the cause of
shutdown before putting the unit back
into service. Consult the factory for ad­
ditional information.
PERIODIC CHECKS
Seal Cavity And Bearing 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 Section E, Maintenance and Repair.
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.