2201Q4JE-MY-C9-N_2018.01.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 4032**C
5.4 Disassembly and Inspection
5-25
g) The side bearing [28-1] has been press fit from the balance piston cover side of the suction cover.
Remove the snap ring [29-1] holding the side bearing using internal snap ring pliers.
h) Either push out the side bearing from the main rotor casing side using some block or pull it out
using a special tool. For the details of the special tool, refer to Section 5.5.2 in this manual.
5.4.9.2
Inspection
a) Check the oil inlet path to the balance piston part of the suction cover by spraying air, or 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 gray or any foreign matter is buried, 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.
