Maintenance work on the superstructure
8.5 Slewing bearing
07.12.2017
Maintenance manual 3 302 649 en 8 - 29
GMK4090
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 3.2 mm (0.126 in).
This results in the maximum permissible tilting play.
Measuring current tilting play
• Raise the main boom to 80° and slew
to -135° – display (A).
• Fasten a dial gauge on the front on the turn-
table (4) and place the button (1) on to the
lower ring (3) as close as possible to the
gasket (2).
• Slowly derrick the main boom to 20°. The
hook block may not touch the ground.
• Read off from the dial gauge how far the
turntable is inclined 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 play is half as great as the max. permissible tilting play,
you must reduce the maintenance interval;
à Reducing the interval,
p. 8 - 28.
Example: Base value + max. permissible wear = max. permissible tilting play
0.35 mm (0.014 in) + 3.2 mm (0.126 in) 3.55 mm (0.14 in)
B –45°
C +45°
D +135°
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