Manitowoc Grove GMK 4100L-1, Operating Manual

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Crane operation
11.5 Crane operation with main boom
11 - 88 3 302 690 en Operating manual
GMK4100L-1
2
3
.1
1.
201
7
Switching off the
derricking gear If the derricking gear is not required, it should be switched off to avoid
unintentional use.
•
Press the button ( 1 ) once.
– The lamp in the button ( 1 ) will light up dimly.
– Symbol ( 2 ) will be red if the derricking gear is switched off.
If the control lever is assigned more than one function, the derricking gear
will also be switched off if you switch on another power unit which is
assigned to the same control lever movement;
à
Control lever assignment
,
p. 9 - 14.
Lowering the main
boom to a horizon-
tal position The main boom can be set down by referring to the working curves within
the working range specified in the
lifting capacity tables
.
This section supplements the information ( 1 ) in the
lifting capacity tables
supplied for the main boom intermediate lengths.
To prevent any overloading of the derricking cylinder, the derricking
cylinder pressure is also monitored here.
In area ( Z ) of the main boom intermediate
lengths it can be the case, particularly with
main boom angles below 15°, that loads spec-
ified in the
lifting capacity table
are not reached
for shorter main boom lengths.
In this case the RCL shows the reduced maximum load bearing capacity on
the
Maximum load
display.
The RCL continuously calculates this value while taking the derricking cylin-
der pressure into account. If the current load is too big, the RCL shuts down;
à
p. 11 - 57.