Hitachi Zaxis 33U-5A, Operator'S Manual

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MAINTENANCE
7-38
ZX33U-5A, 38U-5A, 48U-5A, 55U-5A
6. 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 Tightening Torque
ZX33U-5A, 38U-5A 50 N∙m (5 kgf∙m, 37 lbf∙ft)
ZX48U-5A, 55U-5A 95 N∙m (9.5 kgf∙m, 70 lbf∙ft)
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 10 N∙m (1 kgf∙m, 7.2 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.
mm
Model B C
ZX33U-5A, 38U-5A 445 20
ZX48U-5A, 55U-5A 570 38
ZX33U-5A, 38U-5A
ZX48U-5A, 55U-5A
B
C
5
MZX5-07-001
2
2
4
4
5
5
6
6
MADB-07-013
MADB-07-014
3
MADB-07-012