Goulds Pumps 3910 11th ed. - IOM - Manual (Page 73)

Transverse Correction
1. Zero indicator P on transverse centerline, 90°
clockwise from top suction centerline
(3 o’clock, Fig. II-E).
2. Rotate indicator/coupling hubs 180° (9 o’clock).
Observe needle and record reading.
3a. Negative Reading - Coupling half X is farther away
from the initial (3 o’clock) position than coupling half
Y. Correct by moving driver away from the initial (3
o’clock) position towards the second (9 o’clock)
position a distance equal to one-half that of the total
reading (Fig. II-E).
3b. Positive Reading - Coupling half X is closer to the
initial (3 o’clock) position than coupling half Y.
Correct by moving driver towards the initial (3
o’clock) position away from the second (9 o’clock)
position a distance equal to one-half that of the total
reading (Fig. II-E).
NOTE: Failure to slide driver evenly will affect
horizontal angular alignment.
4. Repeat steps 1 through 3 until indicator P 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.
COMPLETE ALIGNMENT
A unit is in complete alignment when both indicators A
(angular) and P (parallel) do not vary by more than 0.05
mm (.002 in.) as measured at four points 90° apart when
pump and driver are at operating temperature.
1. Zero indicators A and P on suction/discharge
centerline (12 o’clock).
2. Rotate indicator towards the suction / coupling hubs
180° (6 o’clock). Observe the needles and record the
readings.
3. Make corrections as outlined previously.
4. Zero indicators A and P on transverse centerline, 90°
clockwise from suction centerline (3 o’clock).
5. Rotate indicators/coupling hubs 180° (9 o’clock).
Observe the needles and record the readings.
6. Make corrections as outlined previously.
7. Recheck both axial and transverse readings to ensure
adjustment of one did not disturb the other.
8. Correct as necessary.
NOTE: With experience, the installer will understand
the interaction between angular and parallel align-
ments and will make corrections appropriately.
3910-
11th IOM 5/08
73
Fig. II-E
8