Istruction Manual for Operation and Maintenance SPX-960:
Deformations are also caused by unbalanced distribution of the load which must always be applied on
the hook throat and not on the yoke. The harness cables or chains must be uniformly distributed along
the internal surface of the hook.
As for stain hardening and any other alterations in the steel structure, these are mainly caused by me-
chanical
and thermal stresses. Quick temperature shifts from cold to hot and extremely cold weather can damage
the hooks.
4.8.3 PRECAUTIONS REQUIRED TO PREVENT LOAD RELEASE FROM
HOOK
DANGER
Correct selection of the harnesses plays a fundamental role: do not select rigid material such
as tie rods made of round bars or steel sections, because these may come out of the hook if an
obstacle is hit.
In any case:
1) avoid brisk jerking and braking when lifting loads;
2) do not overload the hook throat (cables or chains near the hook tip are likely to be released);
3) prevent harnesses from slackening in the hook should the load be temporarily deposited or positioned
on a support;
4) prevent the harnesses from getting entangled in obstacles;
5) ensure that the lock latch is in perfect conditions.
DANGER
Load release from the hook is an EXTREMELY SERIOUS event which may involve persons and
objects even if they are far from the operating position.
Periodically check the wire rope and hooks depending on the conditions of use. Be extremely
cautious during these checks after great chills or when operation is required in unusual work
conditions, i.e. operation in special sites as well as lifting of extremely heavy loads.
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MACHINE OPERATION
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