Gorman-Rupp Pumps 86A2-4024H 1535998 and up - Manual (Page 15)

OM-06413 80 SERIES
OPERATION PAGE C - 3
boil, build pressure, and cause the pump to rup­
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
Allow an over‐heated pump to com­
pletely cool before servicing. Do not re­
move plates, covers, gauges, or fittings
from an over‐heated pump. Liquid with­
in the pump can reach boiling tempera­
tures, and vapor pressure within the
pump can cause parts being disen­
gaged to be ejected with great force. Af­
ter the pump completey cools, drain the
liquid from the pump by removing the
casing drain plug. Use caution when re­
moving the plug to prevent injury to per­
sonnel from hot liquid.
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. (See Section E,
Page 1.) If the pump is fitted with a Gorman‐Rupp
double grease lubricated seal, the maximum in­
coming pressure must be reduced to 10 p.s.i.
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.
Stopping
Reduce the throttle speed slowly, and allow the en­
gine to idle briefly before turning the keyswitch to
`OFF'.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
After stopping the pump, close and lock the control
panel cover, or disconnect the positive battery
cable to ensure that the pump will remain inopera­
tive.
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.