Komatsu D31EX-21, Operation & Maintenance Manual, Page: 135 / 256

OPERATION
OPERATION
3-83
1. Pull fuel control lever (1) to a position midway between the
low idling and full speed positions, run the engine at a mid-
range speed, and continue to run under no load for approx.
10 minutes.
2. Blade control lever (2) to the full RAISE position, then hold
the lever in position, and operate slowly to the left tilt relief
and right tilt relief positions for 5 minutes.
3. After this, operate the blade control lever (2) fully to the
RAISE position, hold the lever in position, and relieve the
left and right tilt intermittently. Next, move the lever to the
LOWER position and lower the blade to the ground, then
move the lever to the full FLOAT position, hold the lever in
position, and relieve the left and right tilt intermittently for 5
minutes.
4. After warm-up run is completed, check gauges and caution
lamps for proper operation. If any abnormality is found,
repair it.
q
Continue to run the engine at light load until engine
coolant temperature gauge indicator (3) and HST oil
temperature gauge (4) fall within the green range (B).
(A): White range
(B): Green range
(C): Red range
NOTICE
If the HST oil temperature is low, the machine may deviate
slightly when stopping or starting. Be particularly careful
if the machine has to be operated when the HST oil tem-
perature gauge is still in white range (A).
5. Check that there is no abnormal exhaust gas color, noise or vibration. If any abnormality is found, contact your
Komatsu distributor.
6. After carrying out the warming-up operation, to make the temperature of all equipment the same, run the
engine at a mid-range speed and travel slowly forward and in reverse.
Low idling
Raise
Right tilt
Lower
Left tilt