Maintenance work on the superstructure
8.5 Slewing bearing
8 - 24 3 302 649 en Maintenance manual
GMK4090
07.12.2017
Checking the
outer ring
• Divide the checking of the 68 bolts into 17 working steps of 4 bolts each (1).
Between each of the 17 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 - 23.
• Once they have been checked, mark the screws to avoid subsequent
confusion.
• Remove the tool.
• Start the engine (from the crane cab) 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 inspection of the 67 bolts into 33 work steps with 2 bolts each
and 1 work step with one bolt.
Between each of the 34 operation steps you need to rotate the turntable
to the next pair of 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 pair of screws (1) and (2) on the opposite
side;
à Torques, p. 8 - 23.
• Mark the screws that have been checked, to avoid confusion later.
• Remove the tool.
• Start the engine (from the crane cab) and turn the turntable by 90° –
the second pair of bolts 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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