Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
Operating manual 3 302 690 en 14 - 53
GMK4100L-1
23.11.2017
Switching over
valves
The valves 1 to 3 are labelled with their respective numbers.
For crane operation
• Switch the valves (1), (2) and (3) downwards.
• Secure the valves in this position;
à p. 14 - 52.
For emergency operation
• Unlock the valves (1), (2) and (3);
à p. 14 - 52.
• Switch the valves 1 to 3 to the positions for
the desired crane movement – as shown in
the following table.
For lowering the boom, for example, you must
switch valve 2 upwards. Valves 1 and 3 must
be switched downwards.
s
Emergency operation
for crane movement
Valves
upwards
Valves
downward
Additional switching operations
Lowering 31, 2
Valve Y1104 on continuous operation;
à p. 14 - 54
Valve 4 opened;
à p. 14 - 51
Lowering the boom 22, 3Valve 4 opened;
à p. 14 - 51
Raising 11, 3Valve 4 opened;
à p. 14 - 51
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