Komatsu HM400-5, Operation & Maintenance Manual

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11. Before starting the engine, add 125 ℓ of oil through oil filler
port (F).
When oil is added, the level will temporarily go above the
oil level on sight gauge (G2), but this does not indicate any
abnormality.
12. Start the engine, and run it at low idle.
NOTICE
Do not start the engine before filling with oil.
If the engine is started when there is no oil in the sys-
tem, it will cause damage to the transmission and hy-
draulic pump.
13. Add oil through oil filler port (F) until the oil level is between H and L marks on sight gauge (G2).
When running the engine at idle, be careful not to let the oil level in the brake oil tank go below sight gauge
(G1).
If the oil level goes below sight gauge (G1), stop the engine to raise the oil level in the brake oil tank.
14. Remove the cap from bleeder screw (4) and insert a vinyl
hose.
(Use a commercially available vinyl hose.)
15. Prepare a container with oil in it, and put the other end of
the vinyl hose approximately 50 mm into oil.
16. Loosen bleeder screw (4) approximately 3/4 turns.
17. Run the engine at low idle until no bubble comes out
through the vinyl hose.
18. When fewer bubbles come out, tighten bleeder screw (4)
securely, remove the vinyl hose, then install the cap.
19. Perform the warm-up operation of the engine until the torque converter oil temperature gauge goes to 40 °C
or above.
20. When the torque converter oil temperature gauge rises to 40 °C, bleed the air from the brakes.
For the procedure to bleed air from the brake, see “METHOD FOR BLEEDING AIR FROM BRAKE CIR-
CUIT (4-26)”.
NOTICE
• Do not re-use the oil drained when bleeding the air.
It will cause damage to the equipment.
• Be careful not to let the oil level in the brake oil tank go below sight gauge (G1) during the air
bleed operation.
This will cause damage to the pump.
21. After completely bleeding the air from the brakes, stop the engine for approximately 2 to 3 minutes.
22. After stopping the engine for approximately 2 to 3 minutes, check the oil level in the transmission case, and
adjust it to the specified level.
For the method to check the oil level in the transmission case and add oil, see “METHOD FOR CHECKING
OIL LEVEL IN TRANSMISSION CASE, ADDING OIL (3-153)”.
METHOD FOR LUBRICATING PARKING BRAKE
k k
WARNING
• When performing maintenance, raise the brake oil pressure sufficiently to prevent the parking brake
from being automatically applied. In addition, hang a warning tag that can be seen clearly to prevent
any other person from operating the parking brake switch.
• Never put any oil or grease on the surface of the brake disc or pad.
MAINTENANCE MAINTENANCE PROCEDURE
4-63