2202MYJE-MY-C8-N_2018.02.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 3225**C 5.4 Disassembly and Inspection
5-30
h) The side bearing [28-2] has been press fit from the balance piston cover side of the suction cover.
Remove the snap ring [29-2] using internal snap ring pliers.
i) Either push out the side bearing from the main rotor casing side using some block or pull it out using
a special tool such as shown in Photo 034. For the details of the special tool, refer to Section 5.5.2
in this chapter.
5.4.10.2 Inspection
a) Check the oil inlet path to the balance piston part of the suction cover by spraying air or the like.
b) We recommend unconditional exchange of the side bearings on the occasion of the compressor
overhaul, but for confirmation of the compressor condition and system operating condition, carefully
check the sliding part metal surface of the side bearings.
If the metal surface is turned gray or any foreign matter is embedded, also carefully check the wear
of the rotor shaft.
c) The inside surface of the main rotor casing should have no problems because sufficient clearance is
provided. However, if any trace of scraping by the end of the rotor is found, it should be determined
that the thrust bearing is defective. It is also necessary to check the operational condition, such as
whether the system is operated for a long time with a high intermediate pressure.
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