Maintenance work on the superstructure
8.8 Slewing bearing
16.08.2018
Maintenance manual 3 302 577 en 8 - 63
GMK7450
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 ball slewing
bearing is put into operation or replaced.
The maximum permissible wear is 1 mm (0.039 in).
This results in the maximum permissible tilting play.
Measuring current tilting play
• Raise the main boom completely 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 completely.
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 curr
ent tilting play is greater than the max. permissible tilting play,
you must have the slewing bearing replace
d 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 - 62.
Base value + max. permissible wear = max. permissible tilting play
Example: 0.12 mm (0.005 in) + 1 mm (0.039 in) 1.12 mm (0.044 in)
B –45°
C +45°
D +135°
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