Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 26)

26 AF (42-66) IOM
5. Once the ideal alignment is reached, repeat steps
1-4 substituting position 2 for position 1 and
position 4 for position 3.
METHOD 2 - Straight-Edge Method
For the following steps refer to Fig. 16.
1. Place a straight edge across the two coupling
flanges at position 1 and mark the spot on both
flanges.
2. Adjust the motor or gearbox so that the straight-
edge rests evenly on both flanges (within .003"
.076mm).
3. Rotate both flanges 90
° to positions 2 and repeat
steps one and two.
4. The unit will be in parallel alignment when the
straight edge rests evenly (within .003” .076mm)
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
Complete Alignment
A unit is in complete alignment when both indicators
“A” (angular) and “P” (parallel) do not vary by more
than .003” (.076 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.
Factors that may disturb alignment
The unit should be checked periodically for alignment.
If the unit does not stay in line after being properly
installed, the following are possible causes:
1. Settling or spring of the foundation.
2. Wear of bearings.
3. Pipe strains distorting or shifting the machine.
4. Shifting of the sub-base due to heat created from
an adjacent heat source.
5. Shifting of the building structure due to variable
loading or other causes.
6. Loose nuts or bolts on the pump or driver
assembly.
NOTE: With experience, the installer will
understand the interaction between angular and
parallel and will make corrections appropriately.