18
NOTE: The gearbox can be worked on while in a horizontal position. However, the
diffuser cover must be prevented from falling off when the impeller is removed. If the cover
falls from its location severe damage to cover and output shaft (high speed shaft) will
occur.
Step 2 Prevent impeller from rotating and
remove impeller bolt (3).
NOTE: Impeller bolt may have either a
left-hand or a right-hand thread
depending on impeller rotation direction.
Left-hand rotation impellers will have a
left-hand thread impeller bolt and right-
hand rotation impellers will have a right-
hand thread impeller bolt.
(full emission impeller shown) Compressors that utilize clockwise
impeller rotation when viewed from the
inlet, have left hand thread impeller bolts,
and counterclockwise rotating impellers
have right hand thread bolts.
Step 3 Remove impeller (2). It may be
necessary to pry under the impeller and
cover (15) to loosen it from the shaft. Pry
on opposite sides of the impeller so that
the impeller is removed evenly.
The impeller is dynamically
balanced and should be replaced or
rebalanced if it shows any sign of
damage.
(full emission impeller shown)
Step 4 Remove diffuser cover (15) from seal
housing (30).
Use a flat blade screw driver
inserted into pry slot of cover (15) to help
lift cover from seal housing (30).
(full emission impeller shown)
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