Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
14 - 52 3 302 736 en Operating manual
GMK4090
xx.xx.xxxx
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 - 51.
For emergency operation
• Unlock the valves (1), (2) and (3);
à p. 14 - 51.
• 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 - 53
Valve 4 opened;
à p. 14 - 50
Lowering the boom 21, 3Valve 4 opened;
à p. 14 - 50
Raising 12, 3Valve 4 opened;
à p. 14 - 50
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