WARNING
Any Anti Two Blocking System consists of a
series of mechanical components and cannot
be 100% fail safe.
Do NO T use the Anti Two Block System as a
substitute for good judgement, experience
and accepted safe crane operating practices.
With untrained or inexperienced operators, two blocking the winch cable is a very likely
possibility. When the winch cable end attachments contact the underside of the sheave case,
whether by winching up or by extending the boom without paying out winch cable, the winch
cable can be damaged by crimping or over-tensioning. The sheave may also be damaged.
An anti two blocking system can help prevent cable damage by sensing the position of the winch
cable end attachments with respect to the sheave case and shutting down the functions that
cause two blocking.
Restore normal crane function by winching down or retracting the boom until the anti two block
weight is once again suspended freely.
Inspect the anti two block system daily as follows:
1 Examine switch activation mechanism to insure free
unrestricted mechanical operation
2 Examine cord for damage, cuts or breaks. Grasp cord
and pull to check operation of cord reel. The cord
should retract on reel when released.
3 Slowly winch loadline up until anti two block weight
comes in contact with the hook end of the loadline
cable. At the moment the weight is fully supported,
the winch up function should stop functioning and
have no pull capability. If anything else happens, stop
and reverse the function. Failure to do so will risk
damage to the cable or the crane.
4 If the winch up function works properly, actuate the
boom extend function slowly. Gradually increase to
full actuation. The boom extend function should be
non-existent with no tightening of the winch cable. If
anything else happens, stop and reverse the function.
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