Hitachi IJ UX Service Manual page 202

７ Take up the shutoff valve(MV9), remove the makeup
in joint and remove the shutoff valve (MV9).
When the O-ring (P2.2) is remained at the
heating unit, remove it.
８ (1)Put the MV9filter, O-ring3.9, O-ring2.2and O-ring1.7 into the respective holes
of the joint part.
Perform the assembly after dipping the O-ring in makeup, and
confirm that the O-ring does not jump out of the hole.
(2)Connect the makeup IN joint to the shutoff valve
and fix it to the boss on the heating unit.
(3)Put the makeup in joint in the groove of MGV holder.
(4)Attach the MGV holder and fix the shutoff valve.
(5)Put the MV9filter, O-ring3.9,nozzle-In-joint and nozzle-In joint presser foot.
(6)Assemble the shutoff valve connector.
(7)Spurt ink after the assembly and confirm that there is no leak from
each terminal area.
(8)Attach each cover.
Makeup in joint
O-ring 1.7
5-8
ＭG9 filter
Nozzle-In joint
O-ring 3.9
O-ring 2.2
ＭＶ9