Hitachi ZW 120-6 Operator's Manual page 261

8. Supply hydraulic oil through cover (3) hole on the
hydraulic oil tank while checking the oil level at level
gauge (8).
Capacity of hydraulic oil tank
Total capacity in the hydraulic system
9. Securely insert suction filter (6) into pipe (7) when
installing the suction filter.
Before installing cover (3), check that the rod (5) top is
correctly inserted into the support hole on cover (3).
Then, install cover (3) with bolts (4).
Tightening torque: 20 N·m (2.0 kgf·m, 14.8 lbf·ft)
10. Start the engine. Slowly raise or lower the lift arm and
tilt the bucket forward and backward. Stop the engine.
Check for any oil leakage. Check the oil level using level
gauge (8).
Bleed Air from the Hydraulic System.
After changing hydraulic oil or replacing the return filter,
pilot filter and/or suction filter, bleed air from the hydraulic
system following the procedures below.
Bleed Air from the Hydraulic Circuit.
1. After supplying oil, start the engine. Move the bucket
and lift arm cylinders several times to bleed air mixed
in the hydraulic circuit. Do not operate the cylinders to
stroke end.
2. Rest the bucket on the ground to resume the hydraulic
oil level check position.
3. Stop the engine. Check the oil level. Add oil as needed.
MAINTENANCE
: 50 liters
(13.2 US gal)
: 75 liters
(19.8 US gal)
7-43
4
Gauge
3
5
6
7
M4FJ-07-035
8
MNSC-07-014
8
M4GB-07-160