Maintenance work on the superstructure
8.7 Main boom
09.03.2018
Maintenance manual 3 302 744 en 8 - 49
GMK5250L
H
If the desired telescoping status is not a fixed length, you can first telescope
to the next closest fixed length with the semi-automation and then tele-
scope further to the desired length manually;
à Operating manual.
Information
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 instruc-
tions:
• 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 nip-
ples (1) on both sides.
• Use the grease gun (RHUS SW 2) to lubri-
cate the locking pins at the lubricating nip-
ples (2) on both sides.
• Lock and unlock the telescopic section I sev-
eral times, so that the grease is distributed
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 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
must not walk on the main boom.
Use the extendable ladders provided with your crane.
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