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Installation
Alignment Procedure (Hollow Shaft)
Hollow shaft units require accurate alignment with
respect to the unit shaft and the driven/drive equipment
shaft. The pump shaft acts as a pendulum supported
by the top coupling and unit bearing.
Align the unit as follows:
1. Clamp dial indicator to pump shaft, align with base-
bolt plane and set dial indicator to zero (Figure 2).
2. Remove top cover and rotate both unit and pump
shafts.
3. Read dial indicator at 90 degree increments from
starting point.
4. Acceptable
alignment
readings do not exceed 0.0005 inches.
5. Shim flange faces if necessary (Figure 3).
When alignment and vibration of unit are within limits,
engage drive. Run unit at minimum load and check for
vibration - continue to increase load and checking
vibration until full load is obtained.
CAUTION
Excessive vibration may cause damage to bearings
or other motor components.
Determine and correct cause(s) of vibration before
operating.
occurs
when
indicator
Figure 3
Shimming Technique
To avoid the possibility of twisting the flange when
shimming between the flanges, minor shims should be
one-half the thickness of the major shim.
should not penetrate deeper than the bolt hole circle
and not be wider than twice the penetration distance
(Figure 3).
- 8 -
Figure 2
Shims
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