Goulds Pumps 3420 - IOM - Manual (Page 24)

PARALLEL ALIGNMENT
A unit is in parallel alignment when indicator P (parallel
indicator) does not vary by more than .002 in. (.05 mm) as
measured at four points 90
° apart at operating temperature.
Note the preliminary vertical cold setting criteria, Table 1.
Vertical Correction (Top-to-Bottom)
1. Zero indicator P at top dead center of coupling (12
o’clock) half Y.
2. Rotate indicator to bottom dead center (6 o‘clock).
Observe needle and record reading.
3. Negative Reading - Coupling half X is lower than
coupling half Y. Correct by removing shims of
thickness equal to half of the indicator reading under
each driver foot.
Positive Reading - Coupling half X is higher than
coupling half Y. Correct by adding shims of thickness
equal to half of the indicator reading from each driver
foot.
NOTE: Equal amounts of shims must be added to or
removed from each driver foot. Otherwise the vertical
angular alignment will be affected.
4. Repeat steps 1 through 3 until indicator P reads within
.002 in. (.05 mm) or less when hot, or per Table 1
when cold.
Horizontal Correction (Side-to-Side)
1. Zero indicator P on the left side of coupling half Y,
90° from top dead center (9 o‘clock).
2. Rotate indicators through top dead center to the right
side, 180° from the start (3 o‘clock). Observe needle
and record reading.
3. Negative Reading - Coupling half Y is to the left of
coupling half X. Correct by sliding driver evenly in
the appropriate direction.
Positive Reading - Coupling half Y is to the right of
coupling half X. Correct by sliding driver evenly in
the appropriate direction.
NOTE: Failure to slide motor evenly will affect
horizontal angular correction.
4. Repeat steps 1 through 3 until indicator P reads .002
in. (.05 mm) or less.
5. Re-check both horizontal and vertical readings to
ensure adjustment of one did not disturb the other.
Correct as necessary.
COMPLETE ALIGNMENT
A unit is in complete alignment when both indicators A
(angular) and P (parallel) do not vary by more than .002 in.
(.05 mm) as measured at four points 90 apart.
Vertical Correction (Top-to-Bottom)
1. Zero indicators A and P at top dead center (12
o'clock) of coupling half Y.
2. Rotate indicator to bottom dead center (6 o'clock).
Observe the needles and record the readings.
3. Make corrections as outlined previously.
Horizontal Correction (Side-to-Side)
1. Zero indicators A and P on the left side of coupling
half Y, 90° from top dead center (9 o'clock).
2. Rotate indicators through top dead center to the right
side, 180° from the start (3 o‘clock). Observe the
needle, measure and record the reading.
3. Make corrections as outlined previously.
4. Recheck both vertical and horizontal readings to
ensure adjustment of one did not disturb the other.
Correct as necessary.
NOTE: With experience, the installer will understand
the interaction between angular and parallel and will
make corrections appropriately.
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3420 IOM 08/09