Komatsu PC138USLC Operation & Maintenance Manual page 85

DETAILED CONTROLS AND GAUGES
Window Washer Switch
This switch (5) is kept continuously pressed, window washer fluid
is sprayed out on the front glass. When the switch is released, the
spray stops.
If switch (5) is kept pressed when the wiper is stopped, the
window washer fluid will spray, and at the same time, the wiper
will be actuated continuously. When switch (5) is released, the
wiper will continue to operate for 2 cycles, then stop.
If the wiper is moving intermittenly and switch (5) is kept pressed
continuously, window washer fluid will spray, and at the same
time, the wiper will be actuated continuously. When switch (5) is
released, the wiper will continue to operate for 2 cycles, then
return to intermittent operation.
Buzzer Cancel Switch
When this switch (6) is pressed, the warning buzzer for the
abnormal warning item stops.
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OPERATION