10
Take indicator assembly as is and mount it on any short section of the pipe. Holding the pipe
horizontally with indicator assembly on top, set the dial to zero. Rotate the pipe 180° so the indicator
assembly is on the bottom and read the dial. This reading represents indicator assembly sag and must be
considered in the alignment readings.
Set the indicator back on the pump as before. Set the dial to zero and chalk mark the coupling half where
the button rest. (Chalk is not necessary on the elastomeric couplings that have not been disconnected.)
Rotate both shafts by the same amount; i.e., all readings must be made with the button on the chalk mark.
The dial readings will indicate whether the driver has to be raised, lowered or moved to either side. After
each adjustment, recheck both parallel and angular alignments. Accurate alignment of shaft centers can be
obtained with this method even where faces or outside diameters of the coupling are not square or
concentric with the bores. For angular alignment, change the indicator so it bears against the face of the
same coupling half and proceed similarly to above. See Figure IVa & IVb.
NOTE:
Gross deviation in squareness or concentricity may cause unbalance problems and if so must be
corrected.
NOTE:
Permissible misalignment will vary with the type of coupling. Consult coupling manufacturer's
data.
Parallel:
0.4 mm TIR
Angular:
0.004 mm/25.4mm of Radius
Check and correct for angular misalignment before correcting parallel alignment. Final alignment should
be made by moving and shimming the motor on its base until the coupling hubs are within the
recommended tolerances measured in total runout. All measurements should be taken with the pump and
motor bolts tightened. The shaft of a sleeve bearing motor should be in the centre of its mechanical float.
2. MOUNTING C-FACE MOTORS
When mounting C-face motors in the field to pumps equipped with C-face motor adapters, the following
steps must be followed in the sequence given:
a. Slide coupling hubs on pump and motor shaft.
b. Be sure C-face adapter is bolted tight to frame and locating fit is clean.
c. Then mount C- face adapter support foot and tighten.
Summary of Contents for CP7
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