Maintenance work on the superstructure
8.10 Main boom
13.02.2018
Maintenance manual 3 302 719 en 8 - 83
GMK6300L-1
Information
If the main boom has been telescoped several times, the telescoping
mechanism and derricking gear can be so heavily loaded that the main
boom can be neither telescoped nor derricked. Therefore note the following
instructions:
• Before retracting the boom, raise it to approximately 15°.
• Do not lower the main boom below 0°.
s
G
Risk of overturning when telescoping if the RCL is overridden.
Do not override the rated capacity limiter (RCL) when telescoping is
switched off. Select a suitable lifting capacity table which contains the
required telescoping. Set the associated rigging mode and enter the RCL
code.
G
Risk of accidents from slipping off the main boom.
There is grease residue on the telescopic sections. For this reason,
you m
ust not walk on the main boom.
Use the extendable ladders provided with your crane.
G
Risk of injury due to openings on the telescopic unit.
Your fingers/hands could get crushed at the openings in the case of
unintentional tele
scoping.
Secure the main boom against accidental telescoping before you remove
or repl
ace the plates on the openings.
If you are carrying out this operation with the help of someone else,
communicate
with the person in the crane cab by means of clear hand
signals.
Do not put your hand in the opening while lubricating, only use the spray
extension. Protect your eyes from the spray nozzle and wear safety glasses.
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