Subaru Robin PKX201 - Manual (Page 55)

Trash Pumps - PKX Service
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50. Tighten the four knobs with the special tool that is
provided with the pump. Tighten very snugly.
51. Should it become necessary to remove the discharge
nozzle then loosen the four bolts that hold it to the
pump housing.
52. Lift the discharge nozzle off the housing watching the
position of the gasket. Check for cracks, tears or
improper fi t.
49. Install on back plate and loosely tighten the four knobs
making sure the O-ring is seated correctly.