Maintenance work on the superstructure
8.5 Slewing bearing
09.03.2018
Maintenance manual 3 302 744 en 8 - 29
GMK5250L
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 4.0 mm (0.157 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 gas-
ket (2).
• Slowly lower 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) + 4.0 mm (0.157 in) 4.35 mm (0.171 in)
B –45°
C +45°
D +135°
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