Manitowoc Grove GMK 4100L-1, Operating Manual

Page: 967 / 1016

Malfunctions during crane operation
14.6 Hydraulic emergency operation with the hand pump
Operating manual 3 302 690 en 14 - 51
GMK4100L-1
2
3
.1
1.
201
7
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.