Maintenance work on the superstructure
8.7 Main boom
07.12.2017
Maintenance manual 3 302 649 en 8 - 49
GMK4090
• Raise the main boom to 15°.
• Extend telescopic section IV to 0% and
telescopic section
V to 50%.
• Lower the main boom to 0° – do not lower to
below 0°.
• Extend telescopic section IV to about 75%.
• Use the grease gun (PAL1) to lubricate the
upper inner slide faces at the lubricating nip-
ples (1) on both sides.
• Raise the main boom to 15°.
• Retract telescopic sections IV and V to 0%.
• Fully extend and retract telescopic section V again so that the grease is
distributed over the telescope slide faces.
• Lower the main boom to 0°.
• Lubricate telescopic sections IV, III and II in the same way.
Before driving the truck crane
Fully retracting all telescopic sections of the main boom after greasing may
result in excess lubricant paste emerging at the collar (1).
• Remove any excess lubricant paste from the collar (1).
This is to prevent any lumps dropping off on to the windscreen and
suddenly obstructing the view when driving.
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