Maintenance work on the superstructure
8.5 Slewing bearing
16.11.2018
Maintenance manual 3 302 756 en 8 - 23
GMK6400
8.5 Slewing bearing
8.5.1 Checking the bolts
• Comply also with the running-in regulations; à p. 4 - 1.
Tools – Torque wrench for maximum of 1,450 Nm (1,070 lbf ft).
– Auxiliary tools for the torque wrench; à p. 8 - 25.
Prerequisites – No counterweight is rigged; à Operating manual.
– The truck crane is supported and levelled with the maximum outrigger
span of 8.70 x 8.50 m (28.5
x 27.9 ft); Ã Operating manual.
– In addition, the wheels on the 4th and 5th axle lines should be removed
to improve the freedom of movement under the slewing bearing.
– The main boom is fully retracted and raised to 75°; à Operating manual.
– The current load must not exceed 1 t (2 200 lbs) – if necessary unreeve the
hook block.
– The slewing range 360° around the truck crane must be secured.
– The engine must not be running and must be secured against unauthor-
ised use; Ã p. 2 - 3.
Safety
instructions
s
S
Risk of damage to the bolts on the slewing bearing!
All bolts have been tightened at the factory to a certain torque, and this
should be checked during maintenance. Only slight tightening of the bolts
is permissible, if required.
You may not slacken the bolts and re-tighten them, or completely unscrew
and then reuse them.
If the superstructure has to be removed from the carrier, only a com-
pletely new set of bolts may be used to reinstall the superstructure. Only
original screws should be used manufactured according to the factory
specifications.
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