Crane operation
11.3 Crane operation with main boom
11 - 62 3 112 993 en Operating manual GMK 6400
12.07.2013
11.3.5 Lifting limit switch and lowering limit switch
Lifting limit switch To install/remove the lifting limit switch; Ã p. 12 - 126.
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. 12 - 131.
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) lights 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 –
Lifting, Lowering, Extending and Derricking the lattice
extension
if necessary.
To cancel the shutdown, leave the shutdown range by performing a differ-
ent crane movement or by setting down the load.
G
Risk of accident 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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