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If the unit is received with the pump and
motor mounted on the baseplate:
1. Place the unit in position.
2. Disconnect the coupling halves. Do
not reconnect until all alignment
procedures have been completed.
3. Support the baseplates on metal
shims or wedges having a small
taper. (Refer to Figure 2-2)
a. Place shims close to the founda-
tion bolts. (Refer to Figure 2-2)
b. Place shims close to where the
greatest weight is located.
4. Check the baseplate for distortion:
a. Place a straightedge along the
baseplate to determine if it is dis-
torted.
b. Adjust the shims until the base-
plate is not distorted.
5. Use a section of the pipe to de-
termine if the inlet and discharge
openings are vertical and located
properly.
6. Correct the positions, if necessary,
by adjusting the shims.
2D Alignment
Although fl exible coupled pumps are
carefully aligned prior to crating and
shipping, it is almost a certainty that
strains imposed during transit have
altered the alignment. Complete the
following steps after the unit has been
placed on the foundation and leveled.
The standard coupling supplied by
MTH Pumps has an elastomer member
between two internal serrated fl anges.
They have smooth outsides of equal
diameter. These surfaces are used for
alignment procedures.
To check the PARALLEL alignment:
(Refer to Figure 2-3)
1. Place a straightedge across the two
coupling fl anges.
Figure 2-1
Figure 2-1
Figure 2-2
A dry, easily accessible location is
also important. Allow ample clearance
around the unit for free air circulation. If
a dry location is not available, the pump
can be mounted on a foundation, above
the fl oor. Specify motor enclosure,
pump materials, or coatings to suit the
worst conditions expected. Place the
pump so that it can be easily inspected
and serviced during operation. Suf-
fi cient head room should be provided,
particularly when lifting devices will be
used for heavier assemblies.
2B Foundation
Baseplates alone are not rigid enough
to maintain alignment of the unit. The
pump foundation is used as a support
for the baseplate to maintain align-
ment of the unit. If the baseplate is to
be grouted to the foundation, it is only
necessary to embed the edges. It is
unnecessary to completely fi ll under the
baseplate. DO NOT grout the unit to
the foundation until it has been properly
aligned.
The foundation must be a permanent
rigid installation of concrete or other
material of suffi cient mass to absorb all
normal vibrations. Locate the founda-
tion bolts using a layout or template in
relation to the suction and discharge
piping. If concrete is being used,
foundation bolts of the specifi ed size
can be enclosed in a pipe sleeve two
to three diameters larger than the bolts
to compensate for minor variations in
alignment.
Close coupled pumps can be mounted
on a steel base prior to installation or
mounted directly to the foundation.
Place shims under one or more of the
motor feet so that strain and distortion
will not result when the mounting bolts
are tightened.
2C Leveling (Flexible Coupled
Pumps Only)
Rotation
2. Measure the maximum offset (A),
Figure 2-3, at various points around
the periphery of the coupling. DO
NOT rotate the coupling.
3. If the maximum offset exceeds the
Parallel dimension in Chart 1 for
your sleeve size, loosen the motor
or pump and place thin metal shims
under the motor or pump feet until
the offset is set properly.
Figure 2-3
A
A
4. Torque down the motor or pump.
5. Recheck alignment.
To check the ANGULAR alignment:
(Refer to Figure 2-4)
1. Using a micrometer or caliper, mea-
sure from the outside of one fl ange
to the outside of the other at intervals
around the periphery of the coupling.
DO NOT rotate the coupling
2. Determine the maximum (B) and mini-
mum (C) dimensions.
3. If the difference between the
maximum and minimum exceeds
the Angular dimension in Chart 1 for
your sleeve size, loosen the motor
or pump and place thin metal shims
under the motor or pump feet until
the angular alignment is correct.
4. Torque down the motor or pump.
5. Recheck the parallel alignment
above.
Figure 2-4
B
B
C
C
