3.
Negative Reading - The coupling halves are further apart on the right side than the left. Correct
by either sliding the shaft end of the driver to the left or the other end to the right.
Positive Reading - The coupling halves are closer together on the right side than the left. Correct
by either sliding the shaft end of the driver to the right or the other end to the left, shown below.
Figure 13: Positive reading correction
4.
Repeat steps 1 through 3 until indicator A reads .05 mm (.002 in.) or less.
5.
Re-check both horizontal and vertical readings to ensure adjustment of one did not disturb the
other. Correct as necessary.
3.5.2 Parallel alignment
A unit is in parallel alignment when indicator P (parallel indicator) does not vary by more than .05 mm
(.002 in.) as measured at four points 90° apart at operating temperature. Note the preliminary vertical
cold setting criteria, refer to
Table 2: Cold Setting of Parallel Vertical Alignment on page 15
Vertical Correction (Top-to-Bottom)
1.
Zero indicator P at top dead center of coupling (12 o’clock) half Y (see
).
2.
Rotate indicator to bottom dead center (6 o’clock). Observe needle and record reading.
3.
Negative Reading - Coupling half X is lower than coupling half Y. Correct by removing shims of
thickness equal to half of the indicator reading under each driver foot.
Positive Reading - Coupling half X is higher than coupling half Y. Correct by adding shims of
thickness equal to half of the indicator reading from each driver foot, see below.
Figure 14: Positive reading correction
3.5 Measurement
3501 Installation, Operation, and Maintenance Instructions
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