Gorman-Rupp Pumps VGH2 1/2D31-B 1379872 thru 1208720 - Manual (Page 11)

OM−06122 VGH SERIES
PAGE B − 4 INSTALLATION
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si-
phon breaker is used in the line. Otherwise, a si-
phoning action causing damage to the pump
could result.
Valves
If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.
With high discharge heads, it is recommended that
a throttling valve and a system check valve be in-
stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota-
tion when it is stopped.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
LUBRICATION
Bearings
The bearing housing was not lubricated when
shipped from the factory. To lubricate the bearing
cavity, fill the constant level oiler as shown in Figure
2, then close the oiler and allow the oil to drain into
the bearing cavity. Repeat this procedure until oil
no longer drains from the constant level oiler.
FILL ONLY
THROUGH
CONSTANT
LEVEL OILER
DO NOT FILL
THROUGH
VENT PLUG
Figure 2. Lubricating Bearing Cavity
Do not fill the bearing cavity through the vent plug
in the top of the housing. This will result in over-fill-
ing, and can cause leakage, excessive heat build
up and/or premature bearing failure.
Check the oil level regularly through the constant
level oiler and add oil as required.
Seal Assembly
The seal assembly is lubricated by the medium be-
ing pumped and no additional lubrication is re-
quired.
ALIGNMENT
The alignment of the pump and its power source is
critical for trouble-free mechanical operation. In
either a flexible coupling or V-belt driven system,
the driver and pump must be mounted so that their
shafts are aligned with and parallel to each other. It
is imperative that alignment be checked after the
pump and piping are installed, and before opera-
tion.
NOTE
Check Rotation, Section C, before final alignment
of the pump.
When mounted at the Gorman-Rupp factory, driver
and pump are aligned before shipment. Misalign-
ment will occur in transit and handling. Pumps
must be checked and realigned before operation.
Before checking alignment, tighten the foundation
bolts. The pump casing feet and/or pedestal feet,
and the driver mounting bolts should also be tightly
secured.