Subaru Robin PKX201 - Manual (Page 61)

Semi Trash Pumps - PKX Service
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1. Drain the water from the reservoir and remove the 4
bolts that hold the outer casing to the pump back
plate.
2. Remove outer casing and volute as an assembly.
Keep tilted backwards so not to allow the volute
to fall out.
3. Note the slot that is cast into the volute. This must
align with the notch cast into the outer casing
when re-assembling.
4. Tip the outer casing on its back and pull the volute
from the outer casing. If the volute seems to be
stuck, (due to the O-ring sticking) then use two hands
while holding the outer casing with another person or
vise.