Subaru Robin PKX201 - Manual (Page 10)

PTG109 Service
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22. Using a 1" inch socket, place the socket over the seal
for
installation.
21. Place the seal over the pump back plate for alignment.
23. After setting the seal in the pump back plate, set the
socket over the top.
24. Tap the seal into position, looking at the position of
the seal after each blow of the hammer to make sure it
is installing evenly.