Maintenance work on the superstructure
8.8 Slewing bearing
16.08.2018
Maintenance manual 3 302 577 en 8 - 55
GMK7450
8.8 Slewing bearing
8.8.1 Checking the screws
• Also adhere to the à Run-in regulations, P. 4 - 1.
Tools – Torque wrench.
– Auxiliary tools for the torque wrench;
à P. 8 - 57.
Prerequisites – The crane must be rigged with an outrigger span of at least 8.76 x 8
.90 m
(28.7 x 29.2 ft) and be level;
à Operating manual.
– A suitable counterweight combination allowing a steeply raised main
boom to be slewed over
a range of 360° is rigged according to the
lifting
capacity table
.
• Be sure to first obtain detailed information from Manitowoc Crane Care.
– The Mega-Wing-Lift, lattice extension and auxiliary hoist are removed.
– In addition, the tyres on the 5th and 6th axle lines should be removed to
improv
e the freedom of movement under the slewing bearing.
– The main boom must be fully retracted and raised to 75;
à Operating
manual
.
– The current load must not exceed 1 t (2 200 lbs) – if necessary u
nreeve 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;
à P. 2 - 3.
Safety instruc-
tions
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 m
aintenance. Only slight tightening of the
screws is permissible, if required.
You may not slacken the bolts a
nd 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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