correctly installed and maintained anti two-block system, the block or ball will not
raise, the boom cannot be extended and the boom cannot be lowered. To return to an
operating condition, either lower the hook or ball, retract or raise the boom.
The operator may need to raise the hook block beyond the point at which the anti two
block system is activated during rigging or travel. The operator may override the
system. (shown in control and instrument sections).
Continuing to pull the block up after contact has been made with the boom head
may result in damage to boom head and sheaves or the cable may be broken
causing the load to drop.
9. Swing and spot the load over the location where it is to be deposited.
10. Lower the load and unfasten the hook.
When spotting the load it may be necessary to alter the boom length or boom
angle. In making these adjustments, the operator must guard against exceeding
the rated load as determined by the load rating charts.
When operating a hydraulic crane, the operator should realize that hydraulic and structural
competence, NOT TIPPING LOAD, is often the determinant of lifting capacity.
Therefore, THE OPERATOR MUST BE GUIDED SOLELY BY THE APPROPRIATE
MANUFACTURER’S LOAD RATING CHART when considering load weight. The
manufacturer’s rated loads must never be exceeded.
Cranes which are factory equipped with auxiliary winches may require additional
counterweight if the auxiliary winch is removed. Refer to the capacity chart (load rating
plate) for the required counterweight total.
T300-1_T500-1_T780
Operating Instructions
192 P/N 12261-683
REVISED: January 2015
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