Malfunctions during crane operation
14.7 Hydraulic emergency operation as per BGR 159
14 - 56 3 302 633 en Operating Instructions GMK5250L
27.09.2017
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 be switched inwards.
G
Danger from mutual interference of the power units!
Always only switch valves for one crane movement up diagonally at a time.
This prevents wrong crane movements being performed and several
movements being performed unintentionally at the same time.
Emergency operation
for crane movement
Valves diag-
onally up
Valves diag-
onally down
Additional switching operations
Lifting 1 2, 3, 4, 5
Valve Y1105 on continuous operation;
à p. 14 - 47
Valve 7 closed;
à p. 14 - 58
Lowering 1 2, 3, 4, 5
Valve Y1104 on continuous operation;
à p. 14 - 47
Valve 7 closed;
à p. 14 - 58
Raising 3 1, 2, 4, 5 None
Lower 5 1, 2, 3, 4 None
Slewing to the left or
right
2, 4 1, 3, 5 Valve 6 closed;
à p. 14 - 58
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