Manitowoc Grove GMK 4100L-1, Operating Manual

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Malfunctions during crane operation
14.5 Emergency operations and programs
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GMK4100L-1
2
3
.1
1.
201
7
Checks in
the emergency
program Before operation, you must check the length indicator displays and the
functioning of the emergency program .
Checking length indicator display
•
Check the displays ( 1 ) and ( 2 ).
Only telescope the main boom if at least one
of the two displays shows a value.
If neither of the displays shows a value, you
must not start the telescoping process. You
have no way of determining the locking point
of a telescopic section. In this case, consult
Manitowoc Crane Care
.
1 Display for the position of the telescoping cylinder in the foot section
There are four different displays.
A Shortly before the locking point – the locking point is reached by
extending
B Shortly after the locking point – the locking point is reached by
retracting
C At the locking point
D Telescopic cylinder not in a foot section – no symbol
G
Risk of damage to the telescoping mechanism
Never telescope the main boom without any length indicator display.
It would then not be possible for you to monitor operations, and compo-
nents in the main boom could be damaged, or a situation could arise in
which the main boom can no longer be extended or retracted.