Maintenance Of Circulation System - Hitachi IJ PH Service Manual

4. Maintenance of Circulation System

4.1 General Structure of Circulation System
4.1.1 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)
Self-tapping screw 3X8
(attaching door lock body)
Driving part area
Companion
parts name
ICU base A
ICU base B
Front panel
Main ink tank
ICU base B
P side plate
ICU base A
Door lock
body
4-1
Ink circulating area
Unit door
Reference tightening
Companion
material
N·m
1.7±0.3
PBT(G30)
1.7±0.3
PBT(G30)
1.33±0.22
PP
1.33±0.22
PP
1.7±0.3
PBT(G30)
ADC12
1.7±0.3
(aluminum)
0.5±0.1
PBT(G30)
POM 0.75 - 1.04
Makeup ink reservoir
Ink filter
Main ink tank
Ink reservoir
torque
kgf·cm
17.3±3
17.3±3
13.6±2.2
13.6±2.2
17.3±3
17.3±3
5.1±1
7.6 - 10.6