Malfunctions during crane operation
14.7 Hydraulic emergency operation as per BGR 159
14 - 66 3 302 690 en Operating manual
GMK4100L-1
23.11.2017
For emergency operation
• If necessary, remove the cover over the
valves 1 to 5.
• Switch the valves 1 to 5 to the positions for
the desired crane movement – as shown in
the following table.
To raise the boom, for example, you must
switch valve 3 upwards. Valves 1, 2, 4 and 5
must point down.
G
Danger from mutual interference of the power units
For one crane movement, always switch valves upward.
This prevents wrong crane movements being performed and several
movements being performed unintentionally at the same time.
Emergency operation
for crane movement
Valves
upwards
Valves
downward
Additional switching operations
Lifting 1 2, 3, 4, 5
Valve Y1105 on continuous operation;
à p. 14 - 67
Lowering 1 2, 3, 4, 5
Valve Y1104 on continuous operation;
à p. 14 - 67
Raising 3 1, 2, 4, 5 None
Lowering the boom 5 1, 2, 3, 4 None
Slewing to the left or
right
2, 4 1, 3, 5 Valve 6 closed;
à p. 14 - 68
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