Hitachi IJ UX Service Manual page 157

Clean the portion stained with ink and then install the new pump head in reverse
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order of the procedures above.
[Caution] Make sure to use new O-rings. (2 pieces)
Be careful not to cause the O-ring to fall off or pinched.
Refer to the figures below for identifications of 4 kinds of pump heads.
3 positions 4 positions
1 position 2 positions
Circulation pump head
Supply pump head Makeup pump head Recovery pump head
Reset the pump time to "0" on the "Parts usage time management" screen.
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