Komatsu H75051 Operation & Maintenance Manual page 246

MACHINE OPERATIONS AND CONTROLS
1.
Depress the accelerator pedal (1) lightly and run the en-
gine at a medium speed for approximately 5 minutes with
no load.
Only in cold weather, perform the following operation to warm up the hydraulic oil.
2.
Check that the engine rotation is smooth, then cancel the
work equipment lock (turn off the pilot lamp in the switch)
with the work equipment lock switch after the warm-up op-
eration.
3.
Operate the multifunction mono-lever to "TILT" position (e)
and to "HOLD" position (b) repeatedly to warm up the hy-
draulic oil.
Duration of relieving at "TILT" position (e) should be within
10 seconds.
Oil reaches the relief pressure through the above opera-
tions, and hydraulic oil gets warmer in a shorter time.
4.
Turn the steering wheel slowly approximately 10 times to
the right and left to warm up hydraulic oil in the steering
valve.
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OPERATION