Malfunctions during crane operation
14.4 Troubleshooting
Operating manual GMK 6400 3 112 993 en 14 - 13
12.07.2013
14.4.2 Malfunctions on the main hoist/auxiliary hoist
Malfunction Cause Solution
Main hoist not working or
malfunctioning
Hoist off, lamp in button lights
up dimly
à Switching on the main hoist,
p. 11 - 57,
à Switching on the
auxiliary hoist
, p. 11 - 59
Dead man's switch not actu-
ated
Press dead man's switch
Emergency stop switch on
à Resetting the emergency stop
switch
, p. 4 - 26
Fuses F1/1, F3/1, F3/2, F3/5,
F3/6 blown
Replace blown fuse;
à p. 14 - 5
Fuse blown on circuit board Replace blown fuse;
à p. 14 - 7
Control unit faulty, error mes-
sage is displayed
Acknowledge error message
once;
à p. 14 - 32 – if error
persists, notify Manitowoc
Crane Care
Fuse F3/7 blown Replace blown fuse;
à p. 14 - 9
Only the lifting function
works
Lowering limit switch
approached
Leave the shutdown range
and lift the main hoist
Only the lowering function
works
Lifting limit switch
approached, lamp
# lights up
Leave the shutdown range
and lower the main hoist
RCL shutdown, lamp
+ lights
up
Leave the shutdown range;
à p. 11 - 37
Fuse F3/3 blown Replace blown fuse;
à p. 14 - 9
Lifting, lowering or high-
speed mode function not
working
Function disabled by ECOS If necessary, acknowledge
error once and briefly turn off
the ignition – if error persists,
notify Manitowoc Crane Care
No Lifting function Fuse RCL F6 blown Replace blown fuse;
à p. 14 - 11
Fuse F3/3 blown Replace blown fuse;
à p. 14 - 9
Lifting or lowering is either
not possible at all or only at a
low speed
Speed limited Increase limit;
à p. 11 - 107
Lifting or lowering function
cannot be switched off
ECOS malfunction Actuate emergency stop
switch;
à p. 14 - 1
No response to control lever
movements
ECOS malfunction concerning
operating elements in the
crane cab
Unrig using hand-held con-
trol;
à p. 14 - 55
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