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) Overwinding detector
(3) Weight
(4) Boom
The overwinding 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 overwinding
prevention device sounds the buzzer intermittently to warn
overwinding.
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 "Retraction" side (pulling toward
you) to lower the hook block (1).
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