Kato SR-300L, Instruction Manual

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(4) Set the main winch switch to the "ON" position and move the right
control lever to the "derricking" side and "lowering" side
simultaneously to derrick the boom so that the hook can be
released from the hook fixing ring.
・ When lowering the main winch, take care not to lower the wire rope further than necessary.
The wire rope could get tangled on the drum.
・ When derricking the boom, take care that the wire rope does not get too tightened.
(491A-0054-0E)
(5) Release the main hook from the fixing ring and stow the ring.
(6) Set the ACS boom operation status to "boom operation".