Manitowoc GROVE GMK7450 - Page 253

Maintenance work on the superstructure
8.7 Slewing gear
16.08.2018
Maintenance manual 3 302 577 en 8 - 51
GMK7450
Checking 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 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; à Operating manual.
• Open the Settings submenu.
Display (1) will show 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 approx. 200 bar (approx. 2 900 psi).
– If the superstructure still does not slew, the braking force of the slew-
ing 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.
• Switch the slewing gear off and switch the engine off.
• Fasten the coil (1) to the valve Y 2304 using
the nut.
• Start the engine and check the slewing gear
for correct operation.