Maintenance work on the superstructure
8.8 Slewing bearing
8 - 58 3 302 577 en Maintenance manual
GMK7450
16.08.2018
Checking the
outer ring
• Divide the checking of the 96 screws into 24 working steps of 4 screws
each (1).
Between each of the 24 operation steps you need to rotate the turntable
to the next
group of 4 screws on the opposite side.
• Switch the engine off after every rotation and secure the truck crane
against unauthorised use;
à P. 2 - 3.
• Check the tightness of the first group of 4 adjoining screws (1);
à Torques, P. 8 - 57.
• Once they have been checked, mark the screws to avoid subsequent con-
fusion.
• Remove the tool.
• Start the engine and turn the turntable by 180° – the second group on the
opposite side is now accessible.
• Switch the engine off.
• Check all other groups in the same way.
Checking the inner
ring
• Divide the checking of the 96 screws into 48 working steps of 2 screws
each.
Between each of the 48 operation steps you need to rotate the turntable
to the next pair of screws on th
e opposite side.
• Switch the engine off after every rotation and secure the truck crane
against unauthorised use;
à P. 2 - 3.
• Check the tightness of the first pair of screws (1) and (2) on the opposite
side;
à Torques, P. 8 - 57.
• Mark the screws that have been checked, to avoid confusion later.
• Remove the tool.
• Start the engine and turn the turntable by 90° – the second pair of screws
on the opposite side is now accessible.
• Switch the engine off.
• Check all other screws in the group in the same way.
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