Maintenance work on the superstructure
8.5 Slewing bearing
8 - 28 3 302 744 en Maintenance manual
GMK5250L
09.03.2018
8.5.4 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 (M3).
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 - 21.
– The truck crane must be rigged with an outrigger span of at least
8.95 x 7.80 m (29.4 x 25.6 ft) and be aligned horizontally;
à Operating
manual
.
– The counterweight combination of 7.0 t (15,400 lbs) must be rigged
according to the
Lifting capacity table.
– The lattice extension must be removed.
– The auxiliary hoist must be removed.
– The main boom is telescoped to 0-0-0-0-0-0.
– The load being lifted must not exceed 1 t (2,200 lbs) – where necessary
unreeve the hook block.
Type The truck crane GMK5250L is equipped with a slewing bearing of the bear-
ing type: KDV, single-row.
Type of slewing bearing GROVE part number
Ball slewing bearing
Bearing type: KDV, single-row
04192540 or 03246884
Model plate: Inside the inner ring.
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