Malfunctions during crane operation
14.5 Emergency operations and programs
14 - 46 3 302 633 en Operating Instructions GMK5250L
27.09.2017
For the MAXbase
slewing range
type
If the
Standard slewing range type is activated; Ã p. 14 - 45.
Slewing is not monitored by the RCL in emergency operation.
Due to the wide variety of possible outrigger spans and the asymmetry,
the permissible slewing ranges cannot be representing as simple tables.
When slewing with the hand-held control is unavoidable
• Refer to the lifting capacity table (provided in digital form only) for the
slewing ranges applicable to the current rigging mode.
• Note the slewing range divisions and the permissible (maximum and
minimum) working radii and lifting capacities for each.
Checking the
RCL display
Check that the enabled slewing ranges and working radii specified in the
lifting capacity table are correctly shown on the RCL display.
• Slew slowly towards a safe range and check that the current position (1)
changes accordingly.
• Derrick slowly towards a safe range and check that the current position (1)
changes accordingly.
– If the RCL display still displays correctly
You can use the
RCL display for orientation while slewing and correct the
working radius before reaching the slewing range limits.
– If the RCL does not display correctly
Slew slowly only and monitor the slewing range limits and working radius
based on the values specified in the
lifting capacity table. You may need to
determine the current position via measurements, depending on the
availability of the displays (slewing angle/working radius).
G
Risk of overturning when slewing in emergency operation!
Execute the measures described in this section before slewing and during
slewing. Special caution must be exercised with the
MAXbase slewing
range type because several parameters must be monitored simultane-
ously.
If you have any doubts, contact
Manitowoc Crane Care.
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