Figure 5: Dial indicator setup
2.
Check setting of indicators by rotating coupling half X to ensure indicators stay in contact with
coupling half Y but do not bottom out. Adjust indicators accordingly.
Measurement techniques
1.
To ensure accuracy of indicator readings, always rotate both coupling halves together so indica-
tors contact the same point on coupling half Y. This will eliminate any measurement problems
due to runout on coupling half Y.
2.
Take indicator measurements with driver hold-down bolts tightened. Loosen hold-down bolts prior
to making alignment corrections.
3.
Take care not to damage indicators when moving driver during alignment corrections.
Alignment Procedure
A check for both angular and parallel alignment must be completed and the necessary adjustments be
made to obtain the .003in. (.076mm) T.I.R. stated in the alignment criteria.
Angular alignment
A unit is in angular alignment when indicator A (Angular Indicator), Fig 3, does not vary by more
than .003in. (.076mm) as measured at four points on the coupling periphery goo apart at operating tem-
perature. There are two methods outlined below which are acceptable to achieve the desired alignment.
Method 1 - Dial Indicator Method
For the following steps, refer to Fig. 4.
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 1 than position 3.
5.1 Installation Instructions-Vertical Pumps
Model VJC Installation, Operation, and Maintenance Manual
17
Summary of Contents for VJC
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