Maintenance work on the superstructure
8.5 Slewing bearing
8 - 26 3 302 574 en Maintenance manual
GMK3060
03.11.2017
Checking the
outer ring
• Divide the checking of the 52 screws into 13 working steps of 4 screws
each.
Between each of the 13 operation steps you need to rotate the turntable
to the next group of 4 bolts 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 - 25.
• Once they have been checked, mark the bolts to avoid subsequent
confusion.
• Remove the tool.
• Start the engine and turn the turntable by 180° – the second group of
screws 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 inspection of the 52 screws in 26 operation steps each with a
pair of screws on the opposite side.
Between each of the 26 operation steps you need to rotate the turntable
to the next pair of bolts 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 pair of screws (1) and (2) on the opposite
side;
à Torques, p. 8 - 25.
• Once they have been checked, mark the bolts to avoid subsequent
confusion.
• 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 the other pairs in the same way.
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