Maintenance work on the superstructure
8.4 Slewing gear
07.12.2017
Maintenance manual 3 302 649 en 8 - 17
GMK4090
Check When checking the slewing gear brake you must perform the slewing move-
ment against the slewing gear brake.
• Switch the engine off.
• Remove the coil (1) from the valve Y 2307
(release the slewing gear brake).
The slewing gear brake will now not
be released when the slewing gear is
switched on.
• Start the engine and switch on the slewing gear.
• Open the CCS menu Hydraulic pressure.
Display (1) will show the pressure in the slewing gear's hydraulic circuit.
• Move the control lever slowly to the stop and wait until the pressure in the
hydraulic circuit has risen to approx. 200 bar (approx. 2 900 psi).
– If the superstructure still does not slew, the braking force of the
slewing gear brake is adequate.
– If the superstructure does slew, the slewing gear brake is defective and
must be repaired immediately by
Manitowoc Crane Care or an author-
ised GROVE dealer.
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