Malfunctions during crane operation
14.6 Hydraulic emergency operation
14 - 48 3 302 633 en Operating Instructions GMK5250L
27.09.2017
14.6.2 Establishing the hydraulic circuits required
If the Lower movement is to be performed in addition to raising the boom
after switching on the energy source, then you must switch over the valves
and switch a valve to continuous operation.
Switching over
valves
For crane operation
Always establish this state immediately after
the emergency operation.
• Close the valves (2) and (3). Secure the
valves with the locks (1).
For emergency operation
• Remove the locks (1).
• Switch the valves (2) and (3) to the positions
for the desired crane movement – as shown
in the following table.
Emergency operation
for crane movement
Valve
opened
Valve closed Additional switching operations
Raising and lowering
the boom
2, 3
Valve Y1104 on continuous operation;
à p. 14 - 49
Raising 2, 3 None
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