Alignment Procedure
On gear driven AF pumps angular and parallel misalignment are corrected in the vertical direction by
means of shims under the motor or gearbox mounting feet, and in the horizontal direction by adjusting
bolts that slide the motor or gearbox in the proper direction.
After each adjustment, it is necessary to recheck the alignment of the coupling halves. Adjustment in one
direction may disturb adjustments already made in another direction. It should not be necessary to adjust
the pump in any way.
Angular Alignments
Couplings are in angular alignment when indicator "A" (Angular Indicator), (refer to Figure:
Proper cou-
pling alignment
) does not vary by more than 0.076mm | 0.003" as measured at four points on the cou-
pling periphery 90° apart at operating temperature. Outlined below are two acceptable methods to ach-
ieve the desired alignment.
METHOD 1 - Dial Indicator Method
For steps 1 through 5 refer to Figure:
Directions for viewing coupling (view from front end of pump).
1.
Zero indicator “A” at position 1 of coupling half (Y). Mark this position on both flanges.
2.
Rotate both flanges 180° 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.
Figure 15: Directions for viewing coupling (view from front end of pump)
4.
Correct any misalignment by shimming the under the motor or gearbox feet to attain the proper
alignment.
When using positions 2 and 4 in steps 1-3, correct any misalignment by sliding the motor back
and forth to attain the proper alignment.
5.
Repeat steps 1-4 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:
Directions for viewing coupling (view from front end of pump).
1.
Insert a feeler gauge at position 1 at the periphery of the couplings. Mark this position on both
flanges.
4.4 Drive Alignment Procedures
30
Model AF (42"/1200mm/54"/60"/66") LM/LMR Bearings Installation, Operation, and Maintenance Manual