Komatsu WA380-6 Operation & Maintenance Manual page 189

OPERATION
OPERATION
WHEN USING AUTO-SHIFT
If an attempt is made to switch the direction between forward and reverse when the auto-shift is ON, normally, the
gearshift range will switch F3 -> R2, F4 -> R2, or R3 -> F2, R4 -> F2 to make it possible to move the machine off
quickly.
However, if an attempt is made to shift between forward and reverse when the machine is traveling at high speed,
such as shown in ranges (A) or (B) in the chart, the central warning lamp will light up and the buzzer will sound.
At the same time, "OVERRUN PROTECT" is displayed on the bottom line of the character display.
If the alarm buzzer sounds, depress the brake pedal immediately to reduce speed, then operate the directional lever
to switch between FORWARD and REVERSE.
In particular, if an attempt is made to switch between forward and reverse in range (B), the speed range will not
shifted to 2nd, but will switch F3 -> R3, F4 -> R4, or R3 -> F3, R4 -> F4. As a result, the reduction in speed will be
less than in range (A), so care is necessary.
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