Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
Operating manual 3 302 819 en 14 - 53
GMK3060
13.12.2018
14.6.3 Establishing the required hydraulic circuits
To establish a hydraulic circuit you must switch over certain valves and may need
to perform additional switching operations.
Switching over
valves
The valve 1 to 4 are labelled with their respective numbers.
For emergency operation
• Switch the valve 1 to 4 to the positions for the
required crane movement – as shown in the
following table.
For lowering the boom you must e.g. switch the
valve 3 upwards – valve open.
Valves 1, 2 and 4 must be switched downwards.
s
G
Danger from mutual interference of the power units!
Bring only the valves for one crane movement to the emergency operation
position.
This prevents wrong crane movements being performed and several movements
being performed unintentionally at the same time.
Emergency
operation for crane
movements
Valves
upwards
Valves
downward
Additional switching operations
Lifting 1 2, 3, 4
Valve Y1105 on continuous operation;
à p. 14 - 54
Lowering 2 1, 3, 4
Valve Y1104 on continuous operation;
à p. 14 - 54
Raising the boom 3 1, 2, 4
None
Lowering the boom 4 1, 2, 3
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