Komatsu PC130-7, Shop Manual, Page: 61 / 342

PC130-7
20-143
TESTING AND ADJUSTING
BLEEDING AIR FROM EACH PART
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) Open the pump room cover, loosen bleeder
(1), and check that oil flows out.
2) If the oil does not flow out, disconnect drain
hose (2) and fill the pump case with oil
through the drain port.
a
Fix the drain hose adapter to a place
higher than the oil level in the hydraulic
tank.
a
Fill the pump case with oil until oil con-
taining no bu bbles flo ws ou t of the
bleeder.
3) After oil containing no bubbles flows out of
bleeder (1), tighten the bleeder.
3
Air bleeder:
7.8 – 9.8 Nm {0.8 – 1.0 kgm}
a
If the drain hose has been disconnected,
connect it after tightening the bleeder.
2. Starting engine
When running the engine after performing step
1, keep its speed at low idling for 10 minutes.
a
If the engine coolant temperature is low and
the automatic warm-up operation is started,
stop the engine temporarily and reset the
automatic warm-up operation with the fuel
control dial (Set the starting switch in the ON
position and hold the fuel control dial in the
MAX position for 3 seconds, and the auto-
matic warm-up operation is reset).
Air bleeding procedure
Air bleeding item 1 2 3 4 5 6
Contents of work
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
q q q
q
(See note)
q
(See note)
q
• Replacing return filter element
q q
• Replacing and repairing hydraulic
pump
• Removing suction piping
q q q q
• Replacing and repairing control valve
• Removing control valve piping
q q q
• Replacing and repairing cylinder
• Removing cylinder piping
q q q
• Replacing and repairing swing motor
• Removing swing motor piping
q q q
• Replacing and repairing travel motor
• Removing travel motor piping
q q q
• Replacing and repairing swivel joint
• Removing swivel joint piping
q q
BLEEDING AIR FROM EACH PART
(1)