Komatsu WA480-8, Operation & Maintenance Manual

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Steering oil pressure caution lamp (red) (1) and secondary
steering pilot lamp (green) (2) light up simultaneously.
If the steering oil pressure caution lamp (red) or the secondary
steering pilot lamp (green) does not light up, it is abnormal.
Ask your Komatsu distributor for inspection.
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CAUTION
If the machine is steered during self-check, it may move.
Do not steer the machine during self-check.
Check of the secondary steering is not performed in the following cases.
• When you have turned the starting switch to ON position and, without starting the engine, turned it to OFF
position then turned it to ON position again
• When you have turned the starting switch to ON position again immediately after the engine is stopped
when the steering pressure is not completely lowered
• When the engine preheating is operated
To check the secondary steering function, press the secondary steering switch after the warm-up operation.
HANDLE TORQUE CONVERTER LOCKUP
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WARNING
While travelling a downhill (A) of 6 ° or steeper, do not de-
press the accelerator pedal to the stroke end regardless of
ON or OFF of the torque converter lockup function mode.
Otherwise, accidents can be caused by an excessive
speed.
NOTICE
During the high-speed travels listed below, do not shift
down the gear speed in order to prevent overrun.
(The travel speed specified in this section may vary de-
pending on the conditions of use or on road surface condi-
tion.)
• Do not shift down to F2 while the machine is travelling
at 20 km/h or faster in F3.
• Do not shift down to F3 while the machine is travelling
at 30 km/h or faster in F4.
When the actual gear speed is in the rang of 2nd to 4th in both the forward and reverse, the torque converter
lockup function is activated corresponding to the actual travel speed and type of operation to shift the transmis-
sion to the direct drive.
In order to prevent overrun, the lockup is automatically cancelled if engine speed reaches 2500 rpm or above in
each gear speed.
MACHINE OPERATIONS AND CONTROLS OPERATION
3-200