Hitachi IJ PH Service Manual page 96

6 Pass Attaching pin through hole A and hole B for centering holes.
Mount Pressure reducing valve joint PRV on Ink circulation unit by
Nonsert M4x12 (2 pieces). And then remove Attaching pin.
"Caution" : - Make sure that no O-ring drops out.
- Make sure to use Nonsert M4x12.
- Be careful of the mounting direction of Pressure reducing
valve joint PRV.
Nonsert M4X12
7 Mount Pressure reducing valve on Pressure reducing valve joint PRV by
Nonsert M4x16 (2 pieces).
"Caution" : Be careful of the mounting direction of Pressure reducing
valve. (Turn 'Al' mark to the lower side.)
8 Perform "Ink Replenishment" and adjust the pressure.
Make sure that there is no ink leak.
'Al' mark
4-7
Hole A
Hole B
Ink circulation unit
Joint nut
Attaching pin
Pressure reducing valve joint PRV
Pressure reducing valve joint PRV
Pressure reducing valve
Nonsert M4X16