Komatsu PC220LC -8 Operation & Maintenance Manual page 117

DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES
On the screen for Items 1) and 2), it is possible to carry out the
following operations with switches F2 to F6.
F2: Resets all adjusted values to default value
F3: Indicator of selected item moves 1 segment to left.
F4: Indicator of selected item moves 1 segment to right.
F5: Returns to user menu.
F6: Accepts change and switches to next item setting.
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OPERATION OPERATION