Installation
TT Twin-Screw Pump -
Installation, Operation & Maintenance Manual
35
When the reading
value is...
Then do this
Negative
The pump coupling half is lower than the driver coupling half.
Remove shim(s) with a thickness equal to half of the indicator
reading value under each driver foot.
Positive
The pump coupling half is higher than the driver coupling half. Add
shim(s) with a thickness equal to half of the indicator reading value to
each driver foot.
Figure 8 Example of incorrect vertical alignment (side view)
Perform parallel alignment for a horizontal correction
Refer to the table in "
Allowable indicator values for alignment checks
" for the proper
alignment values.
A unit is in parallel alignment when the parallel alignment indicator does not vary by more
than the table limits when measured at four points 90° apart at the operating temperature.
1. Set the parallel alignment indicator to zero on the left side of the driver coupling half, 90°
from the top-
center position (9 o’clock).
2. Rotate the indicator through the top-center position to the right side, 180° from the start
position (3 o’clock).
3. Record the indicator reading.
When the reading
value is...
Then...
Negative
The driver coupling half (Y) is to the left of the pump coupling
half (X).
Positive
The driver coupling half (Y) is to the right of the pump coupling
half (X).
4. Slide the driver carefully in the appropriate direction.
5. Repeat the previous steps until the allowable reading value is achieved
NOTICE:
Make sure to move the driver evenly. (If available, using the horizontal jacking posts and
applying equal turns to each jacking screw is an effective way to do this.) Failure to do so will
