Manitowoc Grove GMK4100L-1 Operating Manual page 954

Malfunctions during crane operation
14.5 Emergency operations and programs
Retracting
with emergency
program
S
14 - 38
This section describes a telescoping process for retracting in four steps. The
starting position is a telescopic section locked at a fixed length and the telescoping
cylinder locked in the telescopic section , which results in the sequence of steps
given here. If the actual starting position is different, start with the corre-
sponding step.
1. Unlock the telescopic section;
2. Retract and lock the telescopic section;
3. Unlock the telescoping cylinder;
4. Extend and lock the telescoping cylinder;
2. Retract and lock the telescopic section
•
For the current telescopic section, note down the value for the locking
à
point at 0%; p. 14 - 41.
Risk of damage to the main boom
If you select locking during telescoping, the locking pins on the telescopic
section are slid out and they can damage or tear the electrical or hydraulic
components in the main boom.
à
p. 14 - 38.
à
p. 14 - 39.
1. Unlock the telescopic section
•
Select and confirm the symbol (1). The
telescopic section is unlocked – display
symbol (2).
While telescoping, never select and confirm
the symbol (3) for locking.
•
Slowly retract the telescopic section to the
locking point at 0% – check on the length
indicator (1) or (2).
•
Select and confirm the symbol (3).
The telescopic section is locked – display
symbol (4).
•
Set down the telescopic section, retracting it
as far as it will go.
3 302 690 en
à
p. 14 - 38.
à
p. 14 - 39.
Operating manual
GMK4100L-1