Crane operation
10.5 Crane operation with main boom
10 - 82 3 302 633 en Operating Instructions GMK5250L
27.09.2017
10.5.4 Lifting limit switch and lowering limit switch
Lifting limit switch To install/remove the lifting limit switch; Ã p. 11 - 120.
The lifting limit switch (1) prevents the hook block from being lifted up to the
main boom head and damaging it.
The lifting limit switch only works if it has been unlocked;
à p. 11 - 125.
The lifting limit switch will be triggered if:
(A) – the hook block raises the lifting limit
switch weight or
(B) – the lifting limit switch weight touches the
ground upon lowering or
(C) – the lifting limit switch weight is not
attached.
The lifting limit switch will not trigger if it is
locked.
The lamp (1) will light up if the lifting limit switch has been triggered.
At the same time, all movements which would increase the load moment
will be switched off –
Lift, Lower, Extend and Derrick lattice extension if
necessary.
To cancel the shutdown, leave the shutdown range by performing a
different crane movement or by setting down the load.
G
Risk of accidents due to intentionally triggering the lifting limit switch!
Always complete the hoisting operation (and extending) before raising the
lifting limit switch weight. If the lifting limit switch is lifted at too great a
speed, the hook block may swing into the main boom head and damage the
head sheaves and the hoist rope.
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