Malfunctions during crane operation
14.4 Troubleshooting
14 - 20 3 302 690 en Operating manual
GMK4100L-1
23.11.2017
14.4.8 Malfunctions on the counterweight hoist unit
14.4.9 Malfunctions in the hydraulic system/hydraulic oil cooler
14.4.10 Malfunctions when inclining the crane cab
Malfunction Cause Solution
Counterweight hoist unit
not working
Emergency stop switch on
à Resetting the emergency
stop switch
, p. 4 - 19
Control unit fuse blown Replace the blown fuse;
à p. 14 - 73
Error symbol (!) is
displayed
Function disabled by CCS If required, acknowledge
error message once and
briefly turn off the ignition
– it if occurs again, notify
Manitowoc Crane Care
Electronic system has
detected an electrical or
logical error
Extend lifting cylinder
not working
Superstructure unlocked
à Lock the superstructure,
p. 11 - 16
Malfunction Cause Solution
Hydraulic oil temperature
above 80 °C (176 °F), fan
in the hydraulic oil cooler
running
Hydraulic system is heavily
loaded
Stop the crane operation
and keep the engine run-
ning until the oil has
cooled down
Hydraulic oil temperature
above 80 °C (176 °F), fan
in the hydraulic oil cooler
not running
Control unit fuse blown Stop crane operation and
replace blown fuse;
à p. 14 - 73
Faulty temperature sensor in
the circuit of the hydraulic
system, error message is
displayed
Have the temperature
sensor replaced
Symbol is displayed Corresponding hydraulic oil
filter soiled
Change hydraulic oil filter;
à Maintenance manual
Malfunction Cause Solution
Crane cab inclination function
not working
Control unit fuse blown Replace the blown fuse;
à p. 14 - 73
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