Manitowoc GROVE GMK5150L, Operating Manual

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Crane operation
11.5 Crane operation with main boom
Operating manual 3 302 709 en 11 - 117
GMK5150L
1
2
.0
1.
201
8
Slewing The following requirements must be fulfilled before slewing:
– Houselock is switched off;
à
p. 11 - 17.
– The superstructure must be unlocked;
à
p. 11 - 15.
– Slewing is permissible with the current rigging mode;
à
p. 12 - 113.
– The current rigging mode is shown on the
RCL
display.
– The counterweight is pre-tensioned;
à
p. 12 - 105
If slewing is not permissible with the current rigging mode, the slewing gear
will be locked.
You can adjust the sensitivity of the control levers to suit the operating
conditions;
à
Setting the characteristic curves for the control levers , p. 11 - 129.
s
G
Danger of overturning when slewing with an incorrectly set RCL
Before slewing, always check that the current rigging mode is shown on the
RCL
display.
This prevents slewing operations being enabled within the impermissible
ranges, which would cause the truck crane to overturn.
G
Risk of crushing during slewing
Before slewing, operate the horn and ensure there are no persons in the
slewing range.
This prevents persons being crushed between the superstructure and the
carrier or between the superstructure and other parts.
S
Risk of the main boom buckling.
Do not accelerate the slewing speed to such a degree that the load starts
swinging.
S
Risk of damage due to overridden slewing gear shutdown.
If the lifting limit switch has been overridden, then the load torque related
shutdowns of the slewing gear will not be released (for example, if the pre-
tensioning pressure of the counterweights is too low). For this reason, do
not start slewing as long as the lifting limit switch is overridden.