2200LZJE-HO-C6-N_2013.12.
Chapter 5 Maintenance
Compound 2-stage Screw Compressor 2016**C 5.6 Overhaul
5-27
To identify where to set, the thrust bearing outer race spacers and thrust bearing alignment spacers
have a stamped mark of "M" or "F" which means "for M rotor" or "for F rotor".
The bearing glands, thrust bearing outer race spacers and thrust bearing alignment spacers, which
have been removed, should be divided into two groups (M rotor group and F rotor group).
Incorrect assembly can change the dimensions of the end clearance (gap between the rotor's end
face and the bearing head), which may deteriorate the performance or cause a galling accident due
to the heat generated by excessive adhesion between sliding surfaces.
Photo 037 Pulling Out Thrust Bearing Photo 038 Stamp Marks on Spacer and
Thrust Bearing Alignment Spacer
5.6.8.2 Inspection
a) After thoroughly cleaning the thrust bearing, there is no problem if all bearing balls are shiny. If the
ball surfaces are dull, contact us for confirmation.
Next, check the gap between the retainer and the balls. If there is burr in the retainer area where the
balls are held, or if the gap between the balls and the retainer is excessive, there is a problem.
b) Rotate the outer ring while supporting the inner ring with your hand. If you feel an abnormal vibration,
the ball contact surface of the inner/outer ring or the balls themselves are defective. Make a closer
check. Even a tiny piece of dirt that entered during removal can cause a rough feel. In such case,
blow off the dirt with high pressure air after cleaning. If the problem persists, be sure to replace the
part with new one.
c) Moving the cleaned bearing with your hand will make a rattling sound. This is due to the gap
between the balls and the retainer. This sound will not be heard if you rotate the bearing while
holding it level.
If you lubricate the bearing after cleaned, this sound will not be emitted. If the sound is still heard,
the bearing should be checked for details.
d) Even if an abnormality is not identified by the above-mentioned check in the case of thrust bearings
with more than 20,000 hours compressor operation, the thrust bearings should be replaced with
new ones, in consideration of security of the continuation operation until the next overhaul.
As a bearing is a combination of specifically designed parts, even if a bearing
with the same number is found in a bearing manufacturer's catalog, the accuracy
or material may not be identical. Replace the parts with genuine
parts. Parts other than genuine parts are not covered by the warranty.
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