Subaru Robin PKX201 - Manual (Page 80)

High Pressure Pumps - PKX Service
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21. This is a good time to check the condition of the
O-ring that seals the outer housing to the back plate.
Check for nicks, cracks, and replace if necessary
with new.
22. If it becomes necessary to remove the back plate for
servicing the engine, follow the procdures in steps
22-29. First, use an Allen wrench to remove the 4
bolts that attach it to the engine.
23. Lift the back plate out of the way and inspect for
damage.
24. If it becomes necessary to remove the engine from
the frame, remove the four bolts that hold it to the
base plate of the pump frame.