Goulds Pumps VRS - IOM - Manual (Page 20)

METHOD 1 - DIAL INDICATOR METHOD
For the following steps, refer to Figure 5.
1. Zero indicator A at position 1 of coupling half Y. Mark
this position on both flanges.
2. Rotate both flanges 180 degrees to position 3. Observe
needle and record reading.
3. Negative Reading - The coupling halves are further
apart at position 3 than position 1.
Positive Reading - The coupling halves are closer at
position 3 than position 1.
4. The angular alignment should not be a problem. If,
however, 0.003 in (0.076 mm) TIR or less is not
attainable, check the motor and motor mount for
perpendicularity to their respective centerlines.
5. Repeat steps 1 through 4 substituting position 2 for
position 1 and position 4 for position 3. Use the same
marks made on the coupling from position 1 and be
sure to turn the coupling halves together.
METHOD 2 - FEELER GAUGE METHOD
For the following steps refer to Figure 5.
1. Insert a feeler gauge at position 1 at the periphery of
the couplings. Mark this position on both flanges.
2. Record the largest gauge size which fits snugly
between the two flanges.
3. Rotate both flanges 180 degrees to position 3.
4. Insert a feeler gauge at position 3 at the periphery of
the couplings.
5. Record the largest gauge size which fits snugly
between the two flanges.
6. Calculate the difference between the readings at
positions 1 and 3. The difference should not be greater
than 0.003 in (0.076 mm). If, however, 0.003 in (0.076
mm) TIR or less is not attainable, check the motor and
motor mount for perpendicularity to their respective
centerlines.
7. Repeat steps 1 through 6 substituting position 2 for
position 1 and position 4 for position 3. Use the same
marks made on the coupling from position 1 and be
sure to turn the coupling halves together.
PARALLEL ALIGNMENT
The unit is in parallel alignment when indicator P (Parallel
Indicator, see Figure 4) does not vary by more than 0.003
in (0.076 mm) as measured at four points on the coupling
periphery 90 degrees apart at operating temperature. There
are two methods outlined below which are acceptable to
achieve alignment.
METHOD 1 - DIAL INDICATOR METHOD
For the following steps, refer to Figure 5.
1. Zero indicator P at position 1 of coupling half Y. Mark
this position on both flanges.
2. Rotate both flanges 180 degrees to position 3. Observe
the needle and record the reading.
3. Negative Reading - The coupling half Y is shifted
toward position 1. If the value is greater than 0.003 in
(0.076 mm), shift the motor accordingly.
Positive Reading - The coupling half Y is shifted toward
position 3. If the value is greater than 0.003 in (0.076 mm),
shift the motor accordingly.
4. Repeat steps 1 through 3 until indicator P reads 0.003
in (0.076 mm) or less.
5. Once ideal alignment is reached, repeat steps 1 through
4 substituting position 2 for position 1 and position 4
for position 3.
METHOD 2 - STRAIGHT EDGE METHOD
For the following steps, refer to Figure 5.
1. Place a straight edge across the two coupling flanges at
position 1 and mark this position on both flanges.
2. Adjust the motor so that the straight edge rests evenly
on both flanges within 0.003 in (0.076 mm).
3. Rotate both flanges to position 2 and repeat steps 1 and
2.
4. The unit will be in parallel alignment when the straight
edge rests evenly within 0.003 in (0.076 mm) on the
coupling periphery at both positions along the
periphery.
NOTE: Care must be taken to have the straight edge
parallel to the axis of the shafts.
TIP: Since the coupling halves are disconnected, this would
be a good time to check the direction of motor rotation.
FACTORS THAT MAY AFFECT
ALIGNMENT
$
CAUTION
The unit should be checked periodically for alignment.
If the unit does not stay aligned after being properly
installed, it may be due to any of the following causes:
1. Non-rigid foundation
2. Foundation settling
3. Bearing wear
14
VRS IOM - 5/08