Boom extension
4.3 Operation with boom extension
4 - 22 3 112 441 en Lattice extension operating instructions
GMK 4100/4100-L/5095
11.01.2008
4.3.2 Derricking the main boom
If the following prerequisites are met, erecting and setting down the main
boom with rigged boom extension and a slewing range of 360° is permitted
and is monitored by the SLI:
– The current rigging mode with the rigged boom extension is entered on
the SLI, and the corresponding SLI code is displayed according to the
Lift-
ing capacity table
.
– The current reeving type on the boom extension is entered for the hoist-
ing gear of which the hoist rope is reeved on the boom extension.
– Apart from the hook block, no load is attached to the boom extension.
– The main boom is fully retracted.
Once all of the above prerequisites have been fulfilled, the SLI automatically
switches to the rigging tables and derricking is then also enabled in the
angle range below the working range of approximately 15°.
4.3.3 Telescoping with rigged boom extension
Telescoping is only enabled by the SLI if the main boom is derricked to
a certain angle and a maximum permissible load is not exceeded.
The required angle (between 70° and 80°) depends on the rigging mode of
the truck crane.
You can find the required main boom angle and the maximum permissible
load (weight of the hook block) in the
Lifting capacity tables in the chapter
titled
Boom extension rigging tables.
If the main boom angle is too small for telescoping with the boom exten-
sion, the SLI displays a corresponding error message.
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.
S
Risk of overloading the main boom
When telescoping the main boom with the rigged boom extension, you
may not simultaneously slew the superstructure.
This prevents the main boom from being subjected to additional side forces
and increased vibrations and becoming overloaded.
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