Kato SR-300L, Instruction Manual

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(5) Drum rotation detector switch
The rotation of the winch drum which is selected by this switch is
detected during winch operation and a buzzer will sound to
indicate that the winch drum is rotating.
NOTE
The buzzer sound is the same for hoisting and lowering.
NOTE
The buzzer sound becomes faster the faster the drum rotates.
When the drum speeds up f urther, the buzzer sounds
continuously and then dies away.
(6) Working lamp switch
Use this switch to switch on working lamps on the boom,
superstructure and cab when working at night or at other times
when visibility is insufficient.
The working lamps will light only when the PTO switch is set to
the "ON" position.