Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
14 - 54 3 302 709 en Operating manual
GMK5150L
12.01.2018
Switching
over valves
The valves 1 to 3 are labelled with their respective numbers.
For crane operation
• Switch the valves (1), (2) and (3) forwards –
valves closed.
• Secure the valves in this position;
à p. 14 - 53.
For emergency operation
• Unlock the valves (1), (2) and (3);
à p. 14 - 53.
• Switch the valves 1 to 3 to the positions for
the desired crane movement – as shown in
the following table.
For lowering, for example, switch the
valve 2 outward – valve open.
Valves 1 and 3 must be switched forwards.
Emergency
operation for
crane movement
Valves
outward
Valves to
the front
Additional switching operations
Lowering 31, 2
Valve Y1104 on continuous operation;
à p. 14 - 55
Valve 5 open, valve 4 closed;
à p. 14 - 52
Lowering 21, 3
Valve 5 open, valve 4 closed;
à p. 14 - 52
Raising 12, 3
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