Goulds Pumps AF (Axial Flow) (6"-36) MXR Bearings" - Manual (Page 24)

22 AF (6-36) IOM
The AF pump comes with two drive variations, V-belt
and gear driven. Accurate alignment of both systems
is essential to long pump life and reduced pump
problems.
The points at which alignment are checked and
adjusted are:
 Initial Alignment is done prior to operation
when the pump and the driver are at ambient
temperature.
 Final Alignment is done after operation when
the pump and driver are at operating temperature.
Alignment is achieved by adding or removing shims
from under the feet of the driver and gearbox and
shifting equipment horizontally by adjusting bolts as
needed.
NOTE: Proper alignment is the responsibility of
the installer and user of the unit.
Trouble free operation can be accomplished by
following these procedures.
Initial Alignment (Cold Alignment)
 Before Grouting Sub-base - To ensure alignment
can be attained. After Grouting Sub-base - To
ensure no changes have occurred during the mounting
process.
 After Spring Setting – To ensure no changes
have occurred during the leveling process.
 After Connecting Piping - To ensure pipe strains
have not altered alignment. If changes have occurred,
alter piping to remove pipe strains on pump flanges.
Final Alignment (Hot Alignment)
 After First Run - To obtain correct alignment
when both pump and driver are at operating
temperature. Thereafter, alignment should be
checked periodically in accordance with plant
operating procedures.
NOTE: Alignment check must be made if process
temperature changes, piping changes, and or
pump service is performed.
V-BELT DRIVE (SHEAVES)
Well designed and properly installed V-belt drives are
capable of running for years. AF pumps come in
several different belt drive configurations i.e. side by
side, overhead, underslung or “Z” mount. Installation
and alignment procedures are similar for all
configurations. Remove the guard or guards by
referring to the assembly/disassembly instructions.
There are a few items that should be checked during
installation and alignment.
Sheave Alignment - Alignment must be maintained
for full power transmission, minimum vibration, and
long drive life. A dial indicator can be used to check
runout on the periphery and face of each sheave. A
straight edge can be used to check parallel and
angular alignment of the pump and drive sheaves, see
Fig. 17.
1. Belt Installation - When installing new belts,
shorten center distance between sheaves so that
belts can be placed on the sheave without the use
of force. Never 'roll' or "Pry" the belts into place,
as this could damage the belt cords.
2. Check Belt Fit - Regardless of the belt section
used, the belt should never be allowed to bottom
in the groove. This will cause the belts to lose
their wedging action and slippage can occur.
Sheaves or belts that permit such a condition to
occur should be changed.
3. Maintain Proper Belt Tension - Proper tension is
essential for long belt life. Improper tension could
cause belt fatigue and/or hot bearings.
4. Impeller Alignment after Belt Tensioning – If
the impeller was aligned prior to belt tensioning a
check should be made to determine that it is still
centered. An off center impeller may rub and
cause unnecessary pump damage. Belt Tension
will usually cause impeller misalignment opposite
the motor. Be sure to align or re-align in
accordance with the Impeller Alignment section
page 26.
Fig. 17