Malfunctions during crane operation
14.4 Finding and eliminating malfunctions
Operating Instructions GMK5250L 3 302 633 en 14 - 19
27.09.2017
14.4.7 Malfunctions on the slewing gear
Malfunction Cause Remedy
Slewing gear not
functioning
Slewing gear off, lamp in
button lights up dimly
Switch on the slewing
gear;
à p. 10 - 115
Houselock switched on
à Switching the houselock
on/off
, p. 10 - 17
Dead man's switch system
not engaged.
Press dead man's switch
Emergency stop switch
engaged
à Resetting the emergency
stop switch
, p. 4 - 22
Fuse is blown Replace blown fuse;
à p. 14 - 63
Fuse blown on circuit board Replace blown fuse;
à p. 14 - 63
Control unit faulty, error mes-
sage is displayed
Acknowledge error mes-
sage once;
à p. 14 - 3 – if
error persists, notify
Manitowoc Crane Care
Slewing function not
working
Rigging mode for the 0° to the
rear position
confirmed
Confirm rigging mode for
a slewing range
Function disabled by CCS If necessary, acknowledge
error once and briefly
turn off the ignition – if
error persists, notify
Manitowoc Crane Care
Counterweight lifting cylinder
not fully retracted
Retract counterweight lift-
ing cylinder
Counterweight lifting cylinder
not fully retracted – retraction
not possible
Press and hold the
Override lifting limit
switch button – Slewing
at slow speed released
Slewing not possible or
only at low speed
Speed limited Increase limit;
à p. 10 - 123
s
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