Maintenance work on the superstructure
8.5 Slewing bearing
03.11.2017
Maintenance manual 3 302 574 en 8 - 23
GMK3060
8.5 Slewing bearing
8.5.1 Checking the bolts
• Comply also with the run-in regulations; à p. 4 - 1.
Tools – Torque wrench for maximum of 790 Nm (583 lbf ft).
– Auxiliary tools for the torque wrench;
à p. 8 - 25.
Prerequisites – A counterweight is not rigged;
à Operating Instructions.
– The truck crane is rigged with a maximum outrigger span of 6.825 x 6.2 m
(22.4x20
.3ft) and is aligned horizontally.
– In addition, the tyres on the 2nd axle line should be removed to improve
the
freedom of movement under the slewing beari
ng.
– The main boom must be fully retracted and raised to 75°;
à Operating
Instructions
.
– 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
una
uthorised use;
à p. 2 - 3.
Safety
instructions
s
S
Risk of damage to the bolts on the slewing bearing!
All bolts were tightened at the factory with a certain torque, and this should
be checked during maintenance. Only slight tightening of the bolts is
permissible, if required.
You may not loosen 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 complete
set of new bolts may be used to reinstall the superstructure. Only original
bolts manufactured according to the factory specifications may be used.
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