Waukesha Bearings Tilting Pad Journal Bearings with Forced Lubrication - Manual (Page 4)

IMPORTANT
Cleanliness and burr-free surfaces are vital to the proper performance
of the bearing. Remove any burrs or raised edges on the pad faces
with a scraper. Remove any light burrs or fine rust on the collar with
a fine oil stone. Deep rust or bruising will require refinishing.
Prior to installation of the bearing assembly, inspect the bearing cavity and cover for cleanliness.
Remove any debris or dirt from the journal area, the bearing fit and the oil sump areas of the bearing
case. The rotor should be held in place by an overhead hand hoist.
Coat the journal and the bearing fit in the lower half of the case with oil or STP. Place the lower half
of the bearing shell on top of the journal. Check alignment of the oil supply hole in the case with the
position of the oil supply in the bearing shell.
Align the bearing fit in the case with the shell O.D. and roll the bearing into the lower half of the case.
It may be necessary to lift the rotor slightly to allow the bearing shell to roll in easily. Monitor the
position of the temperature sensor lead wires when rolling in the bearing to insure that the wire is not
crimped or twisted.
With the bearing in the lower half of the bearing case, use a rubber head mallet to align the bearing
shell split with the housing split. Both sides of the bearing should align flat with the case. Once the
bearing to case split lines are correct, lower the shaft onto the bearing.
Verify that the anti-rotation dowels in the bearing shell lower half are aligned with the dowel holes in
the shell upper half. Gently lower the top half of the bearing onto the lower half. Check for any stand
off between the two bearing halves. Do not attempt to tighten the split line bolts if the two halves are
not flush. Check for the cause of the standoff and correct. Install the bearing split line bolts and
tighten securely.
It is recommended that a crush check be done to verify a proper bearing to case fit. Place shims
.005"/.010" thick along the case split line on either side of each bolt location. Lay a strip of plastigage
or lead wire parallel to the axis of the machine on the top of the bearing shell. The standard design
specification for the bearing shell crush is metal-to-metal to .002" interference. The plastigage should
be chosen such that the thickness of the shims at the case split line falls in the middle of the plastigage
range.
Install the bearing cap or strap and tighten all split line bolts. After the bearing cup has been seated,
remove the cap and inspect the plastigage. The plastigage should indicate a thickness equal to or less
than the shim thickness used at the split line. The amount of interference is equal to the difference
between the indicated clearance and the shim thickness.
Once the proper crush is confirmed, the bearing clearance should be checked. Place the base of two
dial indicators on a portion of the machine unaffected by rotor or bearing movement, such as the
bearing case horizontal joint. Place one of the indicator's styluses on top of the shaft near the bearing.
It is important that this stylus be placed at the top dead center of the shaft to obtain an accurate
reading. Place the other indicator's stylus on top of the bearing shell. Slowly lift the rotor noting the
shaft rise on the appropriate indicator. Be careful not to raise the rotor into an internal obstruction. Do
not lift the rotor more than twice the set clearance.