Maintenance work on the superstructure
8.7 Main boom
07.12.2017
Maintenance manual 3 302 649 en 8 - 47
GMK4090
Notes
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. Therefore note the following
instructions:
• Before retracting the boom, raise it to approximately 15°.
• Do not lower the main boom below 0°.
Telescopic
section
I
• Observe the following instructions regarding maintenance work.
• Extend the telescopic section I to 100%.
• Use a brush or a roller (PAL1) to lubricate
the outer, upper and outer, lower slide
faces (3).
• Use the grease gun (PAL1) to lubricate the
upper inner slide faces at the lubricating
nipples (1) on both sides.
• Use the grease gun (RHUS 2 AF) to lubricate
the locking pins at the grease nipples (2) on
both sides.
• Lock and unlock the telescopic section I
several times, so that the grease is dis-
tributed over the locking pins.
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 telescope status. 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 must not walk on the main boom.
Use the ladder provided with your crane.
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