2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor 5.4 Disassembly and Inspection
1612LSC Speed Increaser Type
5-36
c) Remove the lock nut [39-1] that has been loosened. Then, remove the torsional slip washer [237-1],
and lock washer [40-2], and thrust washer [250-2].
b)
At the M rotor side, remove the thrust washer [250-], thrust bearing [38-1A] and thrust bearing
alignment spacer [42-1A] in the order.
c)
At the F rotor side, remove the thrust bearing [38-1B], thrust bearing outer race spacer [41-1] and
thrust bearing alignment spacer [42-1B] in the order.
Removing the Thrust Bearing (M rotor) Removing the Thrust Bearing (F rotor)
5.4.13.3 Inspection (High-stage/Low-stage)
a) The thrust bearing is normal if the bearing balls are found fully glossy after the thrust bearing has
been fully washed and cleaned. It is abnormal if the ball surface has tarnish streaky pattern.
b) Support the inner race with your hand and rotate the outer race. If you feel abnormal vibration on the
hand, the rolling contact surface of the inner or outer race or some balls may be in an abnormal
condition. So, carefully check the conditions. You could feel some irregular click even with a small
foreign matter that has entered during the removal process. In such a case, it should return to the
normal condition when high pressure air is used to blow out the foreign matters after washing and
cleaning the unit. If the bearing is determined to be defective, it must be replaced with new ones.
c) If the inner race and outer race can be easily separated, the wear is considered excessive. If so, you
cannot reuse the bearing.
d) After washing the bearing, you should be able to hear a clattering sound when the bearing is rotated
by hand. Such a sound is due to the motion of the ball within the backlash or play, or the gap
between the retainer and the ball. Such a sound will not be heard if the bearing is held horizontal
and turned. If some lubricating oil is applied after washing the bearing, the sound should not be
heard when the bearing is turned. If you can still hear the sound, the bearing is abnormal.
e) If any abnormality is seen in the thrust bearing in the above inspection, replace with new ones.
In addition, carefully check the reason whether due to mere aging or any problem with the operating
condition and/or lubricating mechanism.
If the compressor has been operated for more than 20,000 hours without replacing the thrust
bearing, it is recommended to replace the bearing with a new one for safely continuing the operation
until the next overhaul, even if no abnormality is found in the above described inspection.
Since 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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