Komatsu GALEO HM350-2 Operation & Maintenance Manual page 257

SERVICE PROCEDURE
Make sure that the oil level in the brake oil tank does not go down below the mark in the sight gauge (H) while the
engine is running at low idling. If the oil level goes down below (H) mark, stop the engine and raise the oil level in
the brake oil tank.
5. Remove the cap from bleeder screw (1) and insert a vinyl hose.
(Use a commercially available vinyl hose.)
6. Put the other end of the vinyl hose approx. 50 mm into a
container of oil.
7. Loosen bleeder screw (1) approx. 3/4 turns and run the engine
at low idling until no more bubbles come out from the vinyl
hose.
8. When no more bubbles come out, tighten bleeder screw (1)
securely, remove the vinyl hose, then install the cap.
9. Carry out the warming-up operation of the engine until the torque converter oil temperature gauge goes above
40°.
10. When the torque converter oil temperature gauge rises to 40°, bleed the air from the brakes.
Front brake:See "BLEED AIR FROM FRONT BRAKE (PAGE 4-33)".
Center brake:See "BLEED AIR FROM CENTER BRAKE (PAGE 4-34)".
NOTICE
Do not attempt to use the oil drained during air bleeding again. Such a practice can cause damage on the machine's tool and
equipment.
Make sure that the oil level in the brake oil tank does not go down below (H) level in the sight gauge during air bleeding. If it
does, the brake oil pump could be damaged.
11. After finishing air bleeding, stop the engine (for 2 to 3 minutes), and adjust the oil level so that it reaches the
specified level. For details, see "CHECK OIL LEVEL IN TRANSMISSION CASE, ADD OIL (PAGE 3-75)".
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MAINTENANCE