Maintenance work on the superstructure
8.5 Slewing bearing
07.12.2017
Maintenance manual 3 302 649 en 8 - 21
GMK4090
8.5 Slewing bearing
8.5.1 Checking the screws
• Comply also with the run-in regulations; à p. 4 - 1.
Tools – Torque wrench.
– Auxiliary tools for the torque wrench; à p. 8 - 23.
Prerequisites – The crane must be rigged with an outrigger span of at least 8.66 x 5.31 m
(28.4x17.4ft) and be level;
à Operating manual.
– The auxiliary hoist or alternatively the compensation weight
0.5 t (1,100 lbs) is rigged.
– No further counterweight must be been rigged; .
– In addition, the tyres on the 3rd axle line should be removed so that
freedom of movement under the slewing bearing is improved.
– The main boom must be fully retracted and raised to 66°; 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 is not running and is secured against unauthorised use;
à p. 2 - 3.
Safety
instructions
s
S
Risk of damage to the screws on the slewing bearing
All screws were tightened at the factory with a certain torque, and this
should be checked during maintenance. Only slight tightening of the
screws 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 completely
new set of bolts may be used to reinstall the superstructure. Only original
bolts manufactured according to the factory specifications may be used.
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