Manitowoc Grove GMK4100L-1 Operating Manual page 969

Switching over
valves
Emergency operation
for crane movement
Lowering
Lowering the boom
Raising
Operating manual
GMK4100L-1
The valves 1 to 3 are labelled with their respective numbers.
Valves
upwards downward
3
2
1
14.6 Hydraulic emergency operation with the hand pump
For crane operation
•
Switch the valves (1), (2) and (3) downwards.
•
Secure the valves in this position;
à
p. 14 - 52.
For emergency operation
•
Unlock the valves (1), (2) and (3);
à
p. 14 - 52.
•
Switch the valves 1 to 3 to the positions for
the desired crane movement – as shown in
the following table.
For lowering the boom, for example, you must
switch valve 2 upwards. Valves 1 and 3 must
be switched downwards.
Valves Additional switching operations
Valve Y1104 on continuous operation;
1, 2
Valve 4 opened;
2, 3 Valve 4 opened;
1, 3 Valve 4 opened;
3 302 690 en
Malfunctions during crane operation
à
p. 14 - 54
à
p. 14 - 51
à
p. 14 - 51
à
p. 14 - 51
s
14 - 53