Komatsu D155A-6 Operation & Maintenance Manual page 183

OPERATION
SHIFTING SPEED RANGE BY OPERATING SWIFT SWITCH WHEN TRAVELING
It is possible to operate the shift switch when traveling to change the maximum set speed range when traveling
(automatic shift mode) or speed range used when traveling (manual shift mode).
Automatic shift mode
Changing maximum set speed range when traveling
When traveling forward: Possible to change maximum speed
range to F1 - F3
When traveling in reverse: Possible to change maximum speed
range to R1 - R3
up switch (a): Each time it is pressed, maximum speed range goes
up one range
down switch (b): Each time it is pressed, maximum speed range
goes down one range
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OPERATION