2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor 5.4 Disassembly and Inspection
1612LSC Speed Increaser Type
5-38
5.4.15 Low-stage Rotors and Main Rotor Casing
Care must be taken because the low-stage rotors are heavy.
In addition, since the low-stage M rotor is installed with a mechanical seal; do the work very carefully
not to damage the shaft. It is recommended to apply a protective tape on the shaft surface.
Inspect the ends of the rotor lobes and main rotor casing in the same way as the high-stage, but be
aware that there is an unloader slide valve on the low-stage which may hit against the ends of the rotor
lobes. If the contact is particularly hard, scrape off the contacting parts with a scraper or file. Finally,
make the surface smooth with sandpaper. After making the surface smooth, wash thoroughly with wash
oil and make sure that no iron powder is left inside.
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