Komatsu Galeo PC800-8 Shop Manual page 389

30 Testing and adjusting
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 was 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) Running the engine at low idle, extend and
retract the replaced cylinder 4 – 5 times.
a Stop the piston rod about 100 mm before
each stroke end. Do not relieve the oil.
3) Running the engine at high idle, perform
step 2).
4) 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).
4. Bleeding air from swing motor
1) Motor unit
a Bleed air from the motor unit according
to the following procedure.
i) Run the engine at low idle.
ii) Swing to the right and left slowly to bleed
air.
2) Parking brake circuit
a Normally, air in the parking brake circuit
is bled by swinging the machine in step
1). If you feel dragging of the brake dur-
ing swinging operation, however, bleed
air from the parking brake circuit accord-
ing to the following procedure.
i) Loosen the adapters of brake hoses (3)
and (4) and start the engine.
ii) Run the engine at low idle and set the
swing holding brake release switch to the
RELEASE and NORMAL positions
repeatedly. After clear oil oozes out,
tighten the adapters.
PC800, 850-8
• Front swing motor
• Rear swing motor
3) Safety valve circuit
a Normally, air in the safety valve circuit is
bled by swinging the machine in step 1).
If abnormal sound comes out from
around the safety valve during swinging
operation, however, bleed air from the
safety valve circuit according to the fol-
lowing procedure.
i) Loosen plugs (5) and (6) and start the
engine.
ii) Run the engine at low idle. After clear oil
3 Plug:
oozes out, tighten the plugs.
9.8 – 12.74 Nm {1.0 – 1.3 kgm}
SEN00912-02
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