Maintenance work on the superstructure
8.5 Slewing bearing
16.11.2018
Maintenance manual 3 302 756 en 8 - 31
GMK6400
Measuring
tilting
play
The base value of the tilting play is determined and documented by
Manitowoc Crane Care or an authorised GROVE dealer when the slewing
bearing is put into operation or replaced.
The maximum permissible wear is 0.7 mm (0.028 in).
This results in the maximum permissible tilting play.
Measuring current tilting play
• Derrick the main boom to 76° and slew
to -135° – display (A).
• Attach a dial gauge to the front on the turn-
table (4) and position the probe (1) on to
the
lower ring (3) as close as possible to the
gasket (2).
• Slowly lower the main boom to 0°. The hook
block may not touch the ground.
• Read the turntable inclination on the dial
gauge and record this value as the current
tilting play;
à Appendix – Tilting play
measurement report.
• Remove the dial gauge.
• Repeat the measurement with the slewing
angles
If the current tilting play is greater than the max. permissible tilting play,
you must have the slewing bearing replaced by
Manitowoc Crane Care or an
authorised GROVE dealer.
If the current tilting playis half as great as the max. permissible tilting play,
you must reduce the maintenance interval;
à Reducing the interval, p. 8 - 30.
Example: Base value + max. permissible wear = max. permissible tilting play
0.35 mm (0.014 in) + 0.7 mm (0.028 in) 1.05 mm (0.042 in)
B -45°
C +45°
D +135°
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