REFRIGERATION DIVISION
V SERIES
SCREW COMPRESSOR HANDLING MANUAL
3.4.8.2 Inspection
a) Clean the thrust bearing thoroughly and blow dry.
Inspect the ball bearings and races. The ball bearings should be shiny bright and the ball
cages free of burrs. Also, check the clearance between the balls and cages for the bearing
step (41).
b) Holding the inner race horizontally, spin the outer race rapidly. If any abnormal vibration is felt
through your fingers, further careful inspection is needed. The vibration may be caused by fine
dust particles or be a fault in the bearing.
c) Though the actual service life of a bearing depends on operating conditions, in principle the
bearing should be replaced after 30,000 hours of operation. This period is shortened
somewhat by oil fouling and by changes in temperature and load conditions, however.
If any abnormality, even of the slightest nature, is found in a bearing, replace it with a new one.
Fig. 57 Removing Stop Ring (29)
3.4.9 Suction Cover (5) and Side Bearing (28)
3.4.9.1 Disassembly
a) Remove all bolts securing the suction cover (5) to the rotor casing (1). Remember that several
of the lower bolts were removed when the compressor was lifted off the base and positioned
on the workbench.
b) Screw several of the bolts into the threaded blind holes provided on the rotor casing side to
press the suction cover off evenly. The bolts should be alternately tightened little by little in
order to press the cover off evenly.
When clearance between the cover and the casing flange is sufficient, separate the gasket (6)
from one side.
c) After removing the parallel pin (3), the rotor shafts and the unloader push rod (67) remain
connected to the suction cover (5). Slide the suction cover away from the rotor casing in line
with the rotor shaft. Be sure to keep the rotors in the casing (there is a possibility that they may
come free with the suction cover due to friction).
Supersedes all previous version. This information is for reference use only and subject to change without notice
Revision 2 (June 05,2000) Page 34 of 61
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