Auxiliary single-sheave boom top
5.3 Operation with the auxiliary single-sheave boom top
Lattice extension operating instructions 3 112 441 en 5 - 9
GMK 4100/4100-L/5095
11.01.2008
5.3 Operation with the auxiliary single-sheave boom top
H
When operating with the auxiliary single-sheave boom top, the maximum
speed for the power units is not limited;
à Operating instructions of the
truck crane.
The hoisting, lowering, slewing, derricking and telescoping operations are
carried out in the same way as when operating with the main boom. This
section only contains information additionally required with a rigged or
folded auxiliary single-sheave boom top.
5.3.1 Setting the SLI
•
Enter additionally on the SLI:
– The current rigging mode for operation with the main boom
– The current reeving on the auxiliary single-sheave boom top for the
hoist of which the hoist rope is reeved on the auxiliary single-sheave
boom top.
The loads specified in the lifting capacity tables are reduced when operating
with a auxiliary single-sheave boom top if:
– A hook block is reeved on the main boom or
– The swing-away lattice or heavy load lattice extension is folded on the
side of the main boom.
The values which have to be deducted from the lifting capacities depend on
the length of the swing-away lattice and the weight of the hook block.
A table with the values can be found in the
Lifting capacity tables in the
section titled
Notes on working with the swing-away lattice extension. The SLI is
switched off earlier accordingly.
5.3.2 Derricking and telescoping the main boom
The conditions for raising, setting down and telescoping the main boom
with rigged auxiliary single-sheeve boom top at a slewing range of 360° are
monitored by the SLI;
à Operating instructions of the truck crane – Crane
operation
.
G
Risk of accidents with overridden SLI
Do not override the SLI when lowering the boom into a horizontal position.
If the SLI is overridden, the crane operation will not be monitored and the
truck crane will overturn if you leave the permissible working range.
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