Manitowoc Grove GMK 4100L-1 Maintenance Manual page 260

Maintenance work on the superstructure
8.5 Slewing bearing
Checking the
outer ring
Checking the
inner ring
8 - 24
•
Divide the checking of the 72 screws into 18 working steps of 4 screws
each (1).
Between each of the 18 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 - 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.
•
Divide the inspection of the 71 screws into 35 work steps with 2 screws
each and 1 work step with 1 screw.
Between each of the 35 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 - 23.
side;
•
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 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.
3 302 364 en Maintenance manual
GMK 4100L-1