Gorman-Rupp Pumps 84A2-4024H 1488564 and up - Manual (Page 14)

OM−06412 80 SERIES
OPERATION PAGE C − 3
Strainer Check
If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in-
stalled, monitor and record the 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.
Pump Vacuum Check
With the pump inoperative, install a vacuum gauge
in the system, using pipe dope on the threads.
Block the suction line and start the pump. At oper-
ating speed the pump should pull a vacuum of 20
inches (508 mm) or more of mercury. If it does not,
check for air leaks in the seal, gasket, or discharge
valve.
Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction
lift, and should then stabilize. 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 installation of the vacuum gauge.
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.
On engine driven pumps, reduce the throttle
speed slowly and allow the engine to idle briefly be-
fore stopping.
Reduce the throttle speed slowly, and allow the en-
gine to idle briefly before turning the 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 disconnect the positive battery cable to
ensure that the pump will remain inoperative.
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.
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 keyswitch 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