Bleed Air From The Hydraulic System; Bleed Air From The Hydraulic Circuit - Hitachi ZW140-6 Operator's Manual

6. Supply hydraulic oil through cover (3) hole on the
hydraulic oil tank while checking the oil level at level
gauge (10).
Capacity of hydraulic oil tank
Total capacity in the hydraulic system
7. Install cover (3) with bolts (4 used).
Tightening torque: 40 N·m (4.0 kgf·m) (29.5 lbf·ft)
IMPORTANT: When changing hydraulic oil, take care not
to permit foreign matter such as dirt, water, and /or
sand to enter into the hydraulic oil tank.
8. Start the engine. Slowly raise or lower the arm and tilt
the bucket forward and backward. Stop the engine.
Check for any oil leakage. Check the oil level using level
gauge (10).

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
: 80 liters (21
3
gallons)
: 150 liters
(40 gallons)
7-49
MNDF-07-010
10
M4FC-07-026