Malfunctions during crane operation
14.4 Finding and eliminating malfunctions
14 - 18 3 112 xxx en Operating Manual GMK6300L
xx.xx.xxxx
14.4.7 Malfunctions in the telescoping mechanism
Malfunction Cause Remedy
Telescoping mechanism not
working or malfunctioning
Telescoping mechanism off,
lamp in button lights up dimly
à Switching on the telescoping
mechanism
, p. 11 - 74
Dead man's switch system
not actuated.
Press dead man's switch
Emergency stop switch
engaged
à Resetting the emergency stop
switch
, p. 10 - 22
Fuse F1/1, F1/2, F1/7, F3/1, F3/
2, F3/5 or F3/6 blown
Replace the blown fuse;
à p. 14 - 5
Fuse blown on circuit board Replace the blown fuse;
à p. 14 - 7
Control unit faulty, error mes-
sage is displayed
Acknowledge error message
once;
à p. 14 - 36 – if
error persists, notify
Manitowoc Crane Care
Fuse F3/7 blown Replace the blown fuse;
à p. 14 - 9
Telescopic section and tele-
scoping cylinder locking/
unlocking function not
working
Faulty valve Note the error code
à p. 14 - 36 and notify
Manitowoc Crane Care
Extending function not
working
Fuse F3/3 blown Replace the blown fuse;
à p. 14 - 9
RCL shutdown, lamp
+ lights
up
Leave the shutdown range;
à p. 11 - 37
Lifting limit switch
approached, lamp
# lights up
Leave the shutdown range,
retract boom
Retracting function not
working
Insufficient lubrication Lubricate main boom;
à Maintenance Manual
Main boom is not steep
enough
Leave the shutdown range
and raise the boom
Telescopic section cannot
be operated by moving the
control lever
Telescopic section locked
à Unlocking the telescopic
section
, p. 11 - 84
Telescoping cylinder
unlocked
à Lock telescoping cylinder,
p. 11 - 83
Telescopic section/telescop-
ing cylinder locking function
not working
Fault in hydraulics/electrical
system
Note the error codes
à p. 14 - 19, à p. 14 - 35 and
notify Manitowoc Crane Care
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