2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
SCV-series Screw Compressor 5.4 Disassembly and Inspection
5-33
5.4.11 Bearing Head and Main Bearings
5.4.11.1 Disassembly
a) Unscrew and remove all the hexagon socket head cap screws [2] fastening the main rotor casing [1]
and bearing head [11] .
b) Screw in two removed hexagon head cap screws to the jacking threads on the main rotor casing
flange, and evenly screw them little by little.
Once some gap is produced between the main rotor casing and the bearing head, use a knife or a
spatula like tool to detach the gasket from one side to other side.
When the alignment pins are disengaged, the bearing head is separated from the main rotor casing.
c)
The main bearing [27-2] is lightly press fit.
To remove each main bearing, remove the snap ring [29] using internal snap ring pliers (following
picture to the left). And then, push out the main bearing from the rotor side using a hammer through
a plastic block or pull it out using a special tool such as shown in the Section 5.4.7.1 picture.
5.4.11.2 Inspection
a) We recommend as well as the side bearings, unconditional exchange of the main 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 surfaces of the main bearings.
If the metal surface is gray or any foreign matter is buried, also carefully check the wear of the rotor
shaft.
b)
Check the condition of the surface of the bearing head on the rotor side, where the discharge port is.
Properly mend the surface if any flaw is observed. If the entire surface has significant flaws, either
the thrust bearing is defective or the end clearance adjustment is poor.
If oil compression has been caused during the operation, carefully and thoroughly check the area of
the discharge port in particular. If the continued use is in doubt at all, perform the penetrant testing
to determine if it can be used or not.
c)
Replace the O-ring [451] for the Vi adjusting rod (upper picture to the right).
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