Manitowoc GROVE GMK7450 Maintenance Manual page 260

Maintenance work on the superstructure
8.8 Slewing bearing
Checking the
outer ring
Checking the inner
ring
8 - 58
•
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;
•
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.
•
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 the opposite side.
•
Switch the engine off after every rotation and secure the truck crane
against unauthorised use;
•
Check the tightness of the first pair of screws (1) and (2) on the opposite
à
Torques , P. 8 - 57.
side;
•
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.
à
P. 2 - 3.
à
P. 2 - 3.
3 302 577 en Maintenance manual
GMK7450