Manitowoc Grove GMK 5250L Maintenance Manual page 252

Maintenance work on the superstructure
8.5 Slewing bearing
Checking the
outer ring
Checking the inner
ring
8 - 24
•
Divide the checking of the 96 screws into 24 working steps of 4 screws
each.
Between each of the 24 working 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 - 23.
•
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 off the engine.
•
Check all other groups in the same way.
•
Divide the inspection of the 95 screws into 23 work steps with 4 screws
each and 1 work step with 3 screws.
Between each of the 24 working 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 - 23.
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 off the engine.
•
Check all other screws in the group in the same way.
à
p. 2 - 3.
à
p. 2 - 3.
3 302 744 en Maintenance manual
GMK5250L