SVCN 7 INSTALLATION, OPERATION, & MAINTENANCE
17. Measure the distance between dial reading points, and between dial reading point on fixed
unit hub or shaft and each hold down bolt on movable unit (see Figure 2-12). Record these
readings on the graph or by other suitable means.
Movable Unit
1
2
3
Fixed Unit
Figure 2-12 Alignment Measurement Points
18. Follow the directions on the graph sheet or use other suitable means to plot indicator
readings.
NOTE
TIR in either the vertical or horizontal plane shall not
exceed 0.002 in (0.05 mm). Readings on opposite sides must
be opposite signs. Total angularity must not exceed 0.001
inch per 12 inches (0.03 mm per 305 mm).
19. Check hold down bolt positions on the graph or otherwise determine the amount of shims to
be added for the vertical correction, and the movement required for the horizontal correction,
if either exceeds maximums. If maximums are exceeded:
a. release driver hold down bolts, if installed;
b. using lifting equipment, lift driver and shim under feet for height correction;
NOTE
Horizontal movements should be controlled by jackscrews, if
installed.
c. place dial indicators at the base adjacent to the inboard and outboard hold down bolt area
so that the exact amount of horizontal movement can be controlled;
d. make necessary horizontal corrections while monitoring with indicators;
e. repeat steps 11 through 19 above to verify alignment setting.
DO2604-13
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