Manitowoc Grove GMK4090 Operating Manual page 910

Malfunctions during crane operation
14.4 Troubleshooting
Malfunction
Only the lowering func-
tion works
Lifting, lowering or high-
speed mode function not
working
No lift function
Lifting or lowering is
either not possible at all
or only at a low speed
Lifting or lowering func-
tion cannot be
switched off
No response to control
lever movements
14 - 14
Cause
Lifting limit switch
approached, lamp lights up
RCL shutdown, lamp lights up
Control unit fuse blown
Function disabled by CCS
Control unit fuse blown
Speed limited
CCS malfunction
CCS malfunction for operat-
ing elements in the crane cab
3 302 736 en
Solution
Leave the shutdown
range and lower the hoist.
Leave the shutdown
à
range; p. 11 - 56
Replace the blown fuse;
à
p. 14 - 72
If required, acknowledge
error message once and
briefly turn off the ignition
– it if occurs again, notify
Manitowoc Crane Care
Replace the blown fuse;
à
p. 14 - 72
Increase limit;
à
p. 11 - 123
Emergency stop switch;
à
p. 14 - 1
Unrig using hand-held
à
control; p. 14 - 41
Operating manual
GMK4090