Komatsu WA470-6 2006, Operation & Maintenance Manual

Page: 184 / 392

3.3 Operation Operation
3-112
WA470-6H – VEAM946100
WARNING
If the steering wheel is operated and stopped while the oil tem-
perature is low, there may be a time lag before the machine
stops turning.
In this case, use the frame lock bar to ensure safety, and per-
form the warm-up operation in a wide place.
Do not relieve the hydraulic oil in the circuit continuously for
more than 5 seconds.
NOTE
Turn the steering wheel a little and stop in that position. Confirm
that the machine turns by an angle equivalent to the amount that
the steering wheel is turned.
Select the oil from the table of recommended oils below accord-
ing to the ambient temperature.
If KOMATSU EO10W30-DH is used in the cold season, replace
it with KOMATSU EO15W40-DH oil when the cold season fin-
ishes.
6. After carrying out the warming-up operation, check that the
gauges and pilot lamps are normal.
If there is any abnormality, carry out maintenance or repair.
Run the engine under a light load until engine cooling water
temperature gauge (2) and torque converter oil temperature
gauge (5) are in the green range.
7. Check that there is no abnormal exhaust gas color, noise or
vibration. If any abnormality is found, contact your
KOMATSU distributor.
REMARK
The rotating speed of the cooling fan differs according to the fol-
lowing conditions, but this does not indicate any abnormality.
The cooling fan speed increases when the hydraulic oil tempera-
ture, engine coolant temperature, or transmission oil tempera-
ture are high.
However, when the cooling fan is rotating in reverse, it rotates at
a fixed speed proportional to the engine speed, regardless of
any oil or coolant temperature.
GK047005
Free
Lock
Reservoir Fluid Type
Ambient Temperature
-22 -4 14 32 50 68 86 104 122 °F
-30 -20 -10 0 10 20 30 40 50 °C
Hydraulic system Engine oil
GK038005
2 5