Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
Operating manual 3 302 690 en 14 - 51
GMK4100L-1
23.11.2017
14.6 Hydraulic emergency operation with the hand pump
H
This section only applies to the standard hydraulic emergency operation.
If the truck crane is equipped with an hydraulic emergency operation
system to BGR 159;
à p. 14 - 57.
14.6.1 Operating principle
In hydraulic emergency operation, you can
operate the derricking gear and the main
hoist, e.g. to raise the main boom in the case
of a defective engine.
The hand pump (1), which is activated by
switching over a valve, is used as the energy
source for the crane's hydraulic system.
The hydraulic circuits are switched via the
valves (2).
The crane movements are performed by
operating the hand pump.
14.6.2 Switching over the crane's hydraulic system
for crane operation
• Close the valve (4).
• Secure the valve with the lock (1).
The hand pump is separated from the crane's
hydraulic system.
For emergency operation
• Remove the padlock (1).
• Open the valve (4).
The hand pump is connected with the crane's
hydraulic system.
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