Maintenance work on the superstructure
8.11 Main boom
8 - 90 3 302 577 en Maintenance manual
GMK7450
16.08.2018
Safety
instructions
If the main boom has been telescoped several times, the telescoping mech-
anism and derricking gear can be so heavily loaded that the main boom can
be neither telescoped nor derricked. T
herefore note the following instruc-
tions:
• Before retracting the boom, raise it to approximately 15°.
• Do not lower the main boom below 0°.
G
Risk of accidents from slipping off the main boom!
There is grease residue on the telescopic sections. For this reason, you
must not walk on
the main boom.
Use the ladder provided with your crane!
G
Risk of overturning when telescoping if the RCL is overridden!
You must override the rated capacity limiter (RCL) in order to telescope a
second telescopic section in a
horizontal position.
When the RCL is overridden, only carry out a telescopic extension as far as
specified here. In this
way, you avoid overturning the truck crane – even
when it is rigged with a 60 t counterweight and the superstructure is rotated
to the rear.
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