Maintenance work on the superstructure
8.8 Slewing bearing
8 - 62 3 302 577 en Maintenance manual
GMK7450
16.08.2018
8.8.4 Measuring tilting play
Reducing the
interval
• When after several years of intensive crane operation, half of the value for
the maximum permissible tilting play is reached, then you must reduce
the maintenance interval.
• Measure the tilting play from then on every three months (M 3).
Spare parts and
tools
– Dial gauge (precision 0.01 mm (0.00039 in)) with tripod.
– Measurement report from when the truck crane was put into operation;
à Delivery receipt.
Prerequisites – The slewing bearing must have been previously checked for tightness;
à Checking the screws, P. 8 - 55.
– A suitable counterweight combination allowing tilting play to be gener-
ated at the slewing bearing by slowly lowering the main boom from a
steep position to a fla
t position is rigged according to the
lifting capacity
table
.
• Be sure to obtain detailed information from Manitowoc Crane Care before
measuring tilting play on the GMK7450.
– 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.
– The Mega-Wing-Lift, lattice extension and auxiliary hoist are removed.
– The main boom must be fully retracted.
– The current load must not exceed 1 t (2 200
lbs) – if n
ecessary unreeve the
hook block.
Type The GMK7450 truck crane is equipped with a slewing bearing of the bearing
type: RDV, three rows.
Type of slewing bearing GROVE part number
Roller slewing bearing
Bearing type: RDV, three rows
03319920
Model plate: Inside the inner ring.
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