Gorman-Rupp Pumps 04C3-B 407671 and up - Manual (Page 13)

0 SERIES OM-01218
PAGE B - 5 INSTALLATION
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.
Bypass Lines
If a system check valve is used due to high dis­
charge head, it may be necessary to vent trapped
air from the top of the pump during the priming pro­
cess. This may be accomplished by installing a by­
pass line from the top of the pump, back to the
source of the liquid. The end of the bypass line
must be submerged. The line must be large
enough to prevent clogging, but not so large as to
affect pump discharge capacity.
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.
When checking alignment, disconnect
the power source to ensure that the
pump will remain inoperative.
Adjusting the alignment in one direction
may alter the alignment in another direc­
tion. check each procedure after altering
alignment.
Coupled Drives
When using couplings, the axis of the power
source must be aligned to the axis of the pump
shaft in both the horizontal and vertical planes.
Most couplings require a specific gap or clearance
between the driving and the driven shafts. Refer to
the coupling manufacturer's service literature.
Align spider insert type couplings by using calipers
to measure the dimensions on the circumference
of the outer ends of the coupling hub every 90
_.
The coupling is in alignment when the hub ends
are the same distance apart at all points (see Fig­
ure 3).
Figure 3. Aligning Spider‐Type Couplings
Figure 4. Aligning Non‐Spider Type
Couplings
Align non‐spider type couplings by using a feeler
gauge or taper gauge between the coupling halves