Hitachi ZAXIS 30U-5N Operator's Manual page 219

ZX60USB-5N
6. Loosen bolts (7). Rotate drain valve cover (8) to open
the check port. Slowly loosen drain plug (3). Allow oil to
drain.
7. Remove rod assembly (5) from the hydraulic oil tank.
IMPORTANT: When changing hydraulic oil, take care not
to enter foreign matters such as dirt, water, and/or
sand into the hydraulic oil tank.
8. Clean the filter and tank interior. If suction filter (6) is to
be replaced, install new filter on rod (5) as shown.
9. Before installing the suction filter, check the dimension
of rod assembly (5) shown in figure below. Securely
insert rod assembly (5) into the pipe.
10. Clean, install and tighten drain plug (3).
Model
ZX60USB-5N
11. Add oil until it is between the marks on the oil level
gauge.
12. Before securing cover (2) with bolts, ensure the top edge
of the rod assembly (5) is completely inserted into the
hole of support (4). Make sure filter and rod assembly (5)
are in correct positions. Install cover (2). Tighten the bolts
to 50 N·m (5 kgf·m, 36 lbf·ft).
13. Be sure to do "Bleed Air from Hydraulic System" shown
7-40 page.
f
NOTE: Replace element (6) at the regular interval to keep
hydraulic oil clean and to extend the service life of the
hydraulic components.
Model
ZX60USB-5N
MAINTENANCE
Tightening Torque
95 N·m (9.5 kgf·m)
B C
536 20
7-39
2
4
5
6
7
mm
C
5
MADB-07-014
ZX60USB-5N
8
MADC-07-009
3
MADC-07-010
B
MZX5-07-001