Manitowoc GROVE GMK6400

Maintenance work on the superstructure
8.4 Slewing gear
16.11.2018
Maintenance manual 3 302 756 en 8 - 19
GMK6400
Checks When checking the slewing gear brake you must perform the slewing
movement against the slewing gear brake.
• Switch the engine off.
• Remove the coil (1) from the valve Y 2304.
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 Settings submenu.
The display (1) shows the pressure in the slewing gear's hydraulic circuit.
• Move the control lever slowly to the end stop and wait until the pressure
in the hydraulic circuit has risen to about 200 bar (about 2,900 psi).
– If the superstructure still does not slew, the braking force of the
slewing gear brake is adequate.
– If the superstructure slews, the slewing gear brake is faulty and must
be repaired immediately by
Manitowoc Crane Care or an authorised
GROVE dealer.
• Switch the slewing gear off and switch the engine off.
• Attach the coil (1) to the valve Y 2304 using
the nut.
• Start the engine and check the slewing gear
for correct operation.