Si50-203
Overhaul Instructions
Semi-Hermetic Single Screw Compressor Version III
23
2.
Installing and Adjusting The Gate Rotor Bearings
(1) Installing the bearings
Install the angular-contact ball bearing and deep groove ball bearing. The bearings must be
press-fit, but they do not have to be pressed deeply. Hammer them evenly, and make sure
that the bearings rest on the seats. Also, be sure to install the angular-contact ball bearing in
the correct direction.
Fig. 4-25 Front and back sides of angular-contact ball bearing
Fig. 4-26 Direction of bearings
(2) Adjusting the preload (temporary assembly)
Install the gate rotor shaft in the lower bearing holders mounted with the bearings, and check
the preload of the bearings.
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Insert the gate rotor shaft into the bearings.
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Install gate rotor shims (2) and the gate rotor bearing retainer plate, and tighten the bolts
to the specified torque.
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Turn the gate rotor with full force by hand. The gate rotor must rotate smoothly and
should not produce rolling sound.
a) When rolling sound is produced
Reduce the thickness of the gate rotor adjusting shims, and check again.
b) When gate rotor does not rotate smoothly
Increase the thickness of the gate rotor adjusting shims, and check again.
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After adjustment, disassembly.
During disassembly, separate the shims, lower bearings and gate rotor shafts according
to their installation locations (upward and downward units) so that they can be reinstalled
in the original positions.
Summary of Contents for (A)5LLF
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