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SEN04114-06
Bleeding air from each part
Air bleeding item
Contents of work
• Replacing hydraulic oil
• Cleaning strainer
• Replacing return filter element
• Replacing and repairing hydraulic
pump
• Removing suction piping
• Replacing and repairing control
valve
• Removing control valve piping
• Replacing and repairing cylinder
• Removing cylinder piping
• Replacing and repairing swing
motor
• Removing swing motor piping
• Replacing and repairing travel
motor
• Removing travel motor piping
• Replacing and repairing swivel joint
• Removing swivel joint piping
Note: Bleed air from the swing motor and travel motor only when the oil in the motor cases is drained.
1.
Bleeding air from hydraulic pump
1)
Loosen air bleeder (1) and check that oil
oozes out through the air bleeder.
2)
After the oil oozes out, tighten air bleeder
(1).
Air bleeder:
7.8 – 9.8 Nm {0.8 – 1.0 kgm}
a Do not use an impact wrench to
tighten the air bleeder.
56
1
1
2
Bleeding air
from
Starting
hydraulic
engine
pump
q
q
q
q
q
q
q
q
q
q
2.
3.
30 Testing and adjusting
Air bleeding procedure
3
4
Bleeding air
Bleeding air
from swing
from cylinder
motor
q
q
(See note)
o
o
q
o
q
o
q
o
o
q
o
o
o
o
Starting engine
When running the engine after performing step
1, keep its speed at low idle for 10 minutes.
Bleeding air from cylinder
a If a cylinder is replaced, bleed air from it
before connecting the work equipment. In
particular, the boom cylinder does not
move to the lowering stroke end, if it is
installed to the work equipment.
1)
Run the engine at low idle for about 5 min-
utes.
2)
While running the engine at low idle, raise
and lower the boom 4 – 5 times.
a Stop the piston rod about 100 mm
be f or e e a c h s t r ok e e nd . D o n o t
relieve the oil.
3)
While running the engine at high idle, per-
form step 2).
4)
While running the engine at low idle, move
the piston rod to the stroke end and
relieve the oil.
5)
Bleed air from the arm cylinder and bucket
cylinder according to steps 2) – 4).
5
6
Checking oil
Bleeding air
level and
from travel
starting
motor
operation
q
q
(See note)
o
q
o
q
o
q
o
q
o
q
q
q
o
q
PC130-8
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Troubleshooting
