Manitowoc Grove GMK 5250L User Manual

Malfunctions during crane operation
14.4 Finding and eliminating malfunctions
14 - 16 3 302 633 en Operating Instructions GMK5250L
27.09.2017
14.4.5 Malfunctions on the derricking gear
Malfunction Cause Remedy
Derricking gear not work-
ing or malfunctioning
Derricking gear off, lamp in
button lights up dimly
Switching on the derrick-
ing gear;
à p. 10 - 85
Dead man's switch not
actuated
Press the 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
message is displayed
Acknowledge error mes-
sage once;
à p. 14 - 3 – if
error persists, notify
Manitowoc Crane Care
Lowering function not
working
Lifting limit switch
approached, lamp lights up
Leave the shutdown
range and lower the auxil-
iary hoist
RCL shutdown, lamp lights up Leave the shutdown
range;
à p. 10 - 58
Fuse is blown Replace blown fuse;
à p. 14 - 63
Derricking function not
working
Function disabled by CCS If necessary, acknowledge
error once and briefly
turn off the ignition – if
error persists, notify
Manitowoc Crane Care
Fuse is blown Replace blown fuse;
à p. 14 - 63
Derricking not possible,
or only at low speed
Speed limited Increase limit;
à p. 10 - 123
Derricking cannot be
switched off
CCS malfunction Emergency stop switch;
à p. 14 - 1
No response to control
lever movements
CCS malfunction for operat-
ing elements in the crane cab
Unrig using hand-held
control;
à p. 14 - 41

Manitowoc Grove GMK 5250L Specifications

General

Brand	Manitowoc
Model	Grove GMK 5250L
Category	Construction Equipment
Language	English