Hitachi UX Twin Nozzle Service Manual page 137

[Caution]
Since the circulation unit is made of plastic, tightening the screws with excessive torque will break the unit.
See the table below for reference torques:
Fixing screw (Part to be fixed)
Self-tapping screw M4X12
(Viscometer, etc.)
Self-tapping screw M4X16
(Solenoid valve)
Self-tapping screw M4X30
(Circulation unit)
Self-tapping screw B M3X10
(ICU joint)
Self-tapping screw M4X16
(Solenoid valve, etc.)
Parts where Material
screws are used. tapped
Pump unit PBT(G30)
Circulation unit PBT(G30)
Ink main tank PBT(G30)
Circulation unit PBT(G30)
ADC12
Pump unit
(aluminum)
Pump unit
PBT(G30)
Circulation unit
Recovery
POM
pump unit
4-3
Reference tightening
torque
N·m kgf·cm
1.7±0.3 17.3±3
1.7±0.3 17.3±3
1.7±0.3 17.3±3
1.7±0.3 17.3±3
1.7±0.3 17.3±3
0.5±0.1 5.1±1
1.7±0.3 17.3±3