2202MYJE-MY-C8-N_2018.02.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 3225**C 5.5 Reassembly
5-40
5.5.1 Unloader Slide Valve and Guide Block
a) Attach two O-rings [89] on the guide block stem [88] and screw in the guide block stem securely
from the bottom of the casing. Then, mount the guide block [87] in the casing.
b) If the slide valve assembly has been disassembled, first make sure that the alignment position
between the slide valves [54] and [55] is accurately reproduced and then tighten the hexagon
socket head cap screws [58] with spring washers [267] at the specified torque. The outer diameter
of the spring washers used here is less than normal spring washers for hexagon socket head cap
screws. So, be careful not to mix up with other washers.
c) After using a grind stone or fine sand paper to lightly finish the circumference of the assembly,
mount the assembly in the main rotor casing. Then, slowly push-in the push rod while aligning the
groove of the slide valve with the guide block.
d) After it is assembled, hold the unloader push rod and move it for several times to check that it
moves smoothly. Then, carefully check the joint with the main rotor casing that there is no step
between them.
If there is a step, check it by reversing the orientation of the guide block first. If the step is still
present, it should be due to imperfect assembling, and it must be reassembled.
◆ A slight step between the surfaces of the unloader slide valve and the main rotor casing is
allowed if the slide valve side is lower.
If the step is such that the surface of the unloader slide valve is higher than the
surface of the main rotor casing, it is considered the problem of assembly. In such a
case, it must not be left uncorrected. Be sure to reassemble it. Otherwise, the
periphery of the rotor can make contact with the slide valve, resulting in a severe
damage.
e) The low-stage slide valve assembly has an oil injection pipe guide [168] on the opposite side of the
push rod. Do not forget to install the O-ring [59] (Photo 055).
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