Subaru Robin PKX201 - Manual (Page 51)

Trash Pumps - PKX Service
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33. To insure the impeller is tight. Hit on one of the bladed
in a clockwise position till good resistance is felt.
34. Should it become necessary to remove the volute from
front pump housing or replace the wear plate, follow
the next steps in removing and replacing.
Loosen the 3 bolts that hold the volute to the front
pump housing. These are Allen head bolts.
35. After the bolts have been removed, tap with a rubber
mallet to free the volute from the housing.
36. Carefully remove the volute from the housing by
pulling
up.