Bleeding air from each part 1
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).
3 Air bleeder:
7.8 9.8 Nm {0.8 1.0 kgm}
a Do not use an impact wrench to
tighten the air bleeder.
2. Starting engine
When running the engine after performing step
1, keep its speed at low idle for 10 minutes.
3. 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
before each stroke end. Do not
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).
Air bleeding procedure
123456
Bleeding air
from
hydraulic
pump
Starting
engine
Bleeding air
from cylinder
Bleeding air
from swing
motor
Bleeding air
from travel
motor
Checking oil
level and
starting
operation
Replacing hydraulic oil
Cleaning strainer
qqq
q
(See note)
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(See note)
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Replacing return filter element qoooq
Replacing and repairing hydraulic
pump
Removing suction piping
qqqooq
Replacing and repairing control
valve
Removing control valve piping
qqooq
Replacing and repairing cylinder
Removing cylinder piping
qqooq
Replacing and repairing swing
motor
Removing swing motor piping
qoqoq
Replacing and repairing travel
motor
Removing travel motor piping
qooqq
Replacing and repairing swivel joint
Removing swivel joint piping
qoooq
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