Malfunctions during crane operation
14.4 Finding and eliminating malfunctions
Operating Instructions GMK5250L 3 302 633 en 14 - 17
27.09.2017
14.4.6 Malfunctions in the telescoping mechanism
Malfunction Cause Remedy
Telescoping mechanism
not working or malfunc-
tioning
Telescoping mechanism off,
lamp in button lights up dimly
à Switching on
the telescoping mechanism
,
p. 10 - 97
Dead man's switch not actu-
ated.
Press dead man's switch
Emergency stop switch
engaged
à Resetting the emergency
stop switch
, p. 9 - 10
Fuse blown on circuit board Replace blown fuse;
à p. 14 - 63
Control unit faulty, error
message is displayed
Acknowledge error mes-
sage once;
à p. 14 - 3 – if
error persists, notify
Manitowoc Crane Care
Fuse is blown Replace blown fuse;
à p. 14 - 63
Telescopic section and
telescoping cylinder lock-
ing/unlocking function
not working
Faulty valve Note the error code
à p. 14 - 3 and notify
Manitowoc Crane Care
Extending function not
working
Fuse is blown Replace blown fuse;
à p. 14 - 63
RCL shutdown, lamp lights up Leave the shutdown
range;
à p. 10 - 58
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. 10 - 106
Telescoping cylinder
unlocked
à Lock telescoping cylin-
der
, p. 10 - 105
The telescopic section /
telescoping cylinder
locking function is not
working
Fault in hydraulics/electrical
system
Note the error codes and
notify
Manitowoc Crane
Care
s
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