Pay attention to the distance between the hook block and the boom when raising the hook
block. The hook block also raises when the boom is extended.
Always check the height of the hook block when performing the boom extending operation.
(1) Hook block
(2) Over hoist detector
(3) Weight
(4) Boom
The over hoist detector is a device which automatically stops the
hook block (1) raising up or the boom (4) extending and inhibit
further operations, in a condition where the hook block (1) is raised
up or the boom (4) is extended until the hook block (1) comes close
to the Boom (4) tip and lifts the weight (3) up. In such a condition,
the buzzer intermittently sounds only when hook raising or boom
extending operation is attempted, to warn of over-raising.
When this warning buzzer sounds, immediately operate the Right
work equipment control lever to HOOK LOWERING (push
forward) or Left work equipment control lever to BOOM
RETRACTING (pull backward), so that the hook block (1) is
lowered down.
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