Maeda CC423S-1, Руководство по эксплуатации

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2.4 OVER-HOISTING PREVENTION DEVICE
CAUTION
When raising the hook block, be careful of clearance between the hook block and boom.
Also, the hook block can be raised when the boom is extended.
Perform boom extension operation while always checking the hook block height.
(1) Hook block
(2) Over-hoisting detector
(3) Weight
(4) Boom
The over-hoisting prevention device, when hoisting the hook
block (1) or extending the boom (4), automatically stops hook
block (1) hoisting and boom (4) extension actions and prevents
any further action, if the hook block (1) nears the boom (4) tip
and pushes up the weight (3). At the same time, only when the
hook hoisting and boom extending operations are performed,
the over-hoisting prevention device sounds the buzzer
intermittently to warn over-hoisting.
When the warning buzzer sounds, immediately operate the
right work equipment operation lever to the “Lowering” side
(pushing forward) or the left work equipment operation lever to
the “Contraction” side (pulling toward you) to lower the hook
block (1).