Maintenance Of Circulation System; Structure Of Circulation System - Hitachi IJ UX Service Manual

4. Maintenance of Circulation System

4.1 Structure of Circulation System

4.1.1 General Structure of Circulation System
The general structure of the circulation system is shown in the following figure. Using an
open/close type door (unit door) as a partition, the system is roughly divided into an ink
circulating area (the front side of the equipment) and a driving part area (the rear side of
the equipment).
Exhaust duct
Pump unit
[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 M4X35
(Circulation unit)
Self-tapping screw B M3X10
(ICU joint)
Dri
ving part area
Parts where
screws are used.
Pump unit
Circulation unit
Ink main tank
Circulation unit
Pump unit
Pump unit
Circulation unit
Ink circulating area
Material
tapped
PBT(G30)
PBT(G30)
PBT(G30)
PBT(G30)
ADC12
(aluminum)
PBT(G30)
4-1
Ink cartridge
Unit door
Ink filter
Main ink tank
Makeup cartridge
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