Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
Operating manual 3 302 709 en 14 - 53
GMK5150L
12.01.2018
14.6.3 Establishing the hydraulic circuits required
You must switch over the necessary valves to establish a hydraulic circuit.
The valves 1 to 3 are secured against unintentional switching over.
Releasing/
securing valves
Releasing/securing is described for a valve. The procedure is identical for
valves 1 to 3.
Release – for the emergency operation
• Unscrew the handle (1).
• Move the disc (2) to position A.
• Fasten the handle (1).
Rigging – for crane operation
The valve must be closed.
• Unscrew the handle (1).
• Move the disc (2) to position B.
• Fasten the handle (1).
s
S
Danger due to operating error
Following emergency operation, secure the valves 1 to 3 in position B again
for crane operation.
This prevents uncontrolled crane movements when switching the crane's
hydraulic system on.
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