Subaru Robin PKX201 - Manual (Page 44)

Trash Pumps - PKX Service
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5. Turn the impeller counter-clockwise by hand until free
from crankshaft. Be prepared to catch impeller when
freed from crankshaft. (Its heavy)
7. Count the number of shim(s) that are located on the
crankshaft. Remove slowly and make sure to replace
with the same number when reassembling.
8. It is possible that the shim(s) get stuck in the impel-
ler. Use a screwdriver to pry out and inspect. The
shim(s) should not be bent or distorted in any way.
Replace with new in needed.
6. Inspect the impeller for cracks and bent blades.