MAINTENANCE
7-70
Bleed Air from the Hydraulic System
After changing hydraulic oil, bleed air from the hydraulic
system by following the procedures below.
IMPORTANT: If the hydraulic pump is not filled with oil, it
will be damaged when the engine is started. Bleed air
from the pump.
Bleeding Air from Hydraulic Pump
1. Remove air bleed plug (4) on each pump. Fill the pump
with oil through air bleed plug (4) hole.
2. After hydraulic oil is filled in the pump, provisionally
tighten plug (4). Start to run the engine at slow idle
speed.
3. Slightly loosen one of plugs (4). Allow air to bleed from
the pump through the clearance until hydraulic oil
permeates around plug (4).
4. After bleeding air, tighten plug (4) to specification.
Tightening Torque: 95 N·m (9.5 kgf·m)
5. Repeat Steps 3 and 4 for the remainder of plugs (4).
Bleeding Air from Hydraulic Circuit
1. After filling hydraulic oil, start the engine. While moving
all cylinders and the swing motor evenly, lightly operate
the machine for 10 to 15 minutes.
As the air bleeding device is provided in the pilot circuit,
air will be released by conducting the above operation
for 5 minutes.
2. Lower the bucket to the ground to return to the position
to check hydraulic oil level.
3. Stop the engine. Check the oil level. Add oil as needed.
4
4
ZX225USLC-6
MDAA-07-001
ZX135US-6
MDAA-07-072
MDD5-07-051
44
ZX345USLC-6
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