Establishing The Required Hydraulic Circuits - Manitowoc Grove GMK4090 Operating Manual

14.6.3
Releasing/secur-
ing valves
S
Operating manual
GMK4090

Establishing the required hydraulic circuits

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 is described for a valve. The procedure is identical for
valves 1 to 3.
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.
14.6 Hydraulic emergency operation with the hand pump
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).
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Malfunctions during crane operation
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