Subaru Robin PKX201 - Manual (Page 63)

Semi Trash Pumps - PKX Service
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9. Inspect the impeller for defects.
11. It many happen that the shim(s) get stuck inside the
impeller. When this condition occurs, carefully pry the
shim(s) out with a small screwdriver. If the shims(s) get
bent or are fl attened beyond use, replace with new
one(s).
10. Inspect the rotating part of the seal for cracks, chips
and worn face.
12. Place a small screwdriver under the seal and pry
outward. Placing some liquid (water or detergent) on
the seal might help in removing it if it appears to stick
to the metal.