Goulds Pumps 3910 11th ed. - IOM - Manual (Page 72)

4. Repeat steps 1 through 3 until indicator A reads 0.05
mm (.002 in.) or less.
Transverse Correction
1. Zero indicator A on transverse centerline, 90°
clockwise from suction centerline (3 o’clock,
Fig. II-C).
2. Rotate indicators/coupling halves 180°.
3a. Negative Reading - The coupling halves are farther
apart at the second (9 o’clock) position than at the
initial (3 o’clock) position. Correct by adding shims in
line with the (3 o’clock) position, or by removing
shims in line with the (9 o’clock) position (Fig. II-C).
3b. Positive Reading - The coupling halves are farther
apart at the initial (3 o’clock) position than at the
second (9 o’clock) position. Correct by adding shims
in line with the (9 o’clock) position, or by removing
shims in line with the (3 o’clock) position (Fig. II-C).
NOTE: Drive trains of over 450 pounds are supplied
with adjustment provisions fastened to the motor
support which may be used to make all horizontal
alignment corrections.
4. Repeat steps 1 through 3 until indicator A reads
0.05 mm (.002 in.) or less.
5. Re-check both axial and transverse readings to ensure
adjustment of one did not disturb the other. Correct as
necessary.
PARALLEL ALIGNMENT
A unit is in parallel alignment when indicator P (parallel
indicator) does not vary by more than 0.05 mm (.002 in.) as
measured at four points 90° apart at operating temperature,
or when the shaft centerlines are within the recommended
cold setting criteria as shown in Table II-1.
Table II-1
Cold Setting of Parallel
Vertical Alignment
Driver Type Set Driver Shaft
Electric Motor 0.05 - 0.10 mm LOW
(.002 - .004 in. LOW)
Axial Correction
1. Zero indicator P on suction/discharge centerline (12
o’clock) towards the suction (Fig. II-D).
2. Rotate indicator/coupling halves 180° (6 o’clock). Observe
needle and record reading.
3a. Negative Reading - Coupling half X is farther from the
suction than coupling half Y. Correct by moving driver
away from the suction a distance equal to one-half that
of the total reading (Fig. II-D).
3b. Positive Reading - Coupling half X is closer to the
suction than coupling half Y. Correct by moving driver
towards the suction a distance equal to one-half that of
the total reading (Fig. II-D).
NOTE: Equal amounts of shims must be added to or
removed from entire driver face, or the vertical angular
alignment will be affected.
4. Repeat steps 1 through 3 until indicator P reads 0.05
mm (.002 in.) or less when hot, or per Table II-1 when
cold.
72
3910-
11th IOM 5/08
Fig. II-B
Fig. II-C Fig. II-D