Waukesha Bearings CQ Tilting Pad Thrust Bearings - Manual (Page 3)

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Remove the thrust pads together with the pad stops (they can be removed by
sufficiently raising each pad stop with a screwdriver or similar lever, whereby
each pad can be withdrawn radially outwards).
•
Remove the spacer plate by removing the spacer screws (note that this should be
done with the spacer plate in an uppermost position to prevent the levers becoming
dislodged from the cage ring).
•
Remove the levers.
•
Remove the pillars.
When re-assembling the bearing, the above operations should be reversed, with pad
stop/pillar shanks coated with clean oil to assist insertion. When re-assembling the
thrust pads in a cage ring, ensure that with the pad stops pushed home, the pads are free
to move.
6. Installation
6.1.Cleanliness
To obtain the most reliable performance from these bearings, it is necessary to
observe high engineering cleanliness standards. The interior of the casing and all oil
passages and pipes, especially on the supply side, must be perfectly clean and free
from foundry sand, scale, welding spatter etc. Any unmachined surfaces should be
shot blasted down to a clean metal surface.
6.2.Alignment
It is most important that the shaft and bearing housing are in correct alignment and
this must always be checked carefully during erection of the machine.
So far as the thrust bearing is concerned, correct alignment means that the collar face
and the thrust ring supporting face in the casing are parallel to each other (static
alignment) and the collar face is normal to the shaft axis (dynamic alignment).
The following notes are included in the hope that they will be of assistance, but it is not
intended that they should supplant methods already in use, which may be better suited
to the individual case.
After assembly on its shaft the collar must be checked to ensure that it is running true,
i.e., the face is normal to the axis, and this is most easily done with the shaft revolving
in a lathe. If, however, the collar has to be removed subsequently for erection, it is
better if it can be checked for truth after it is finally fitted to the shaft. This dynamic
misalignment check should result in a total indicator reading (T.I.R) ideally less than or
equal to 0.00004 mm/mm of collar diameter (same figure applies to integral collar
arrangements).
Once the collar is known to be true (dynamic misalignment, i.e. swash), the correct
alignment of the casing (static misalignment) can be checked by gauging the collar and
casing faces, adjusting the alignment until the two faces are equidistant.