Subaru Robin PKX201 - Manual (Page 75)

High Pressure Pumps - PKX Service
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1. Drain 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. Tip
backwards not allowing the volute to drop out of the
casing.
3. Correct voulte placement is shown in picture.
Discharge chute is pointing upward.
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.