Komatsu H75051 Operation & Maintenance Manual page 332

MAINTENANCE PROCEDURE
7.
Open the drain valve (4) at the bottom of the radiator and
drain the coolant.
8.
Tighten the drain valve (4) and add tap water.
Add water until it fills the radiator.
9.
Start the engine.
10. Depress the accelerator pedal (5) lightly and run the en-
gine at a medium speed for approximately 5 minutes with
no load.
11. Check that the engine rotation has become smoother, then
press the work equipment lock switch (6) to release the
work equipment lock (pilot lamp goes out).
12. Operate the multifunction mono-lever (7) to "TILT" position
(e) and to "HOLD" position (b) repeatedly to warm up the
hydraulic oil.
Oil reaches the relief pressure through the above opera-
tions and hydraulic oil gets warmer in a shorter time.
13. Turn the steering wheel slowly approximately 10 times to the right and left to warm up the hydraulic oil in
the steering valve.
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MAINTENANCE