OM-05845
GHC SERIES
PAGE C-1
OPERATION
OPERATION - SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
PUMP OPERATION
Never use a pressure relief valve to reg
ulate liquid flow. Pressure relief valves
are designed as safety devices only. At
tempting to regulate flow with a pres
sure relief valve may cause the pump or
piping to explode, causing severe per
sonal injury or death.
PRE‐OPERATION
Make certain that all instructions in
INSTALLA
TION,
Section B have been carried out.
The standard version of the pump is de
signed to handle a wide range of light, me
dium, and heavy viscosity liquids, depend
ing on design and components. Do notop
erate the pump with higher liquid tempera
tures than what it was designed; otherwise,
pump components and operation may be
affected. For temperature range consult
The Gorman‐Rupp Company.
Before Starting The Pump
Never operate the pump against a
closed suction or discharge valve. The
pump will overheat, and may rupture or
explode, causing personal injury or
death.
Open all valves in the suction and discharge lines,
and close all drain valves.
If your pump is equipped with a packing seal, loos
en the gland nuts before starting the pump until the
packing gland may be moved slightly. If leakage
seems excessive after starting, wait until the pump
has run long enough to reach its normal operating
temperature before adjusting the gland nuts.
Do
not over‐tighten the gland nuts.
Packing pumps
must leak slightly
to cool and lubricate the shaft
and to allow the shaft to turn freely.
Consult the drive manufacturer's operating manu
al before attempting to start the drive.
In a suction lift application, fill the pump housing
with liquid to seal clearances and to lubricate the
pump.
Checking Pump Rotation
Correct rotation of your pump is shown on the
pump serial plate or direction arrow plate.
In applications with a single direction of
flow and a single pump‐mounted pressure
relief valve, make certain that the drive unit
turns the pump in the correct direction of
rotation. Otherwise, the pump‐mounted
pressure relief valve will not function.
Follow the drive unit manufacturer's instructions,
jog the pump motor
briefly
, and check rotation.
If a 3‐phase motor is being used and rotation is in
correct, have a qualified electrician interchange
any two of the 3‐phase wires to change the direc
tion of rotation. If a 1‐phase motor is being used
and rotation is incorrect, consult the motor man
ufacturer's literature.
Gorman‐Rupp rotary gear pumps are bi‐
directional; however, the pumps are
