Maintenance Of Circulation System; Structure Of Circulation System - Hitachi IJ RX2 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:
Part name (used location)
Self-tapping screw M4X12
(attaching pressure system, etc.)
Self-tapping screw M4X16
(attaching solenoid valve)
Self-tapping screw M4X12
(attaching pump cover)
Self-tapping screw B M3X10
(attaching ICU joint)
Driving part area
Companion
parts name
ICU base A
ICU base B
Main ink tank
ICU base B
P side plate
ICU base A
Ink circulating area
Companion
material
PBT(G30)
PBT(G30)
PP
PBT(G30)
ADC12
(aluminum)
PBT(G30)
4-1
Makeup reservoir
Unit door
Ink filter
Main ink tank
Ink reservoir
Reference tightening
torque
N·m kgf·cm
1.7±0.3 17.3±3
1.7±0.3 17.3±3
1.33±0.22 13.6±2.2
1.7±0.3 17.3±3
1.7±0.3 17.3±3
0.5±0.1 5.1±1