Malfunctions during crane operation
14.4 Troubleshooting
14 - 20 3 302 736 en Operating manual
GMK4090
xx.xx.xxxx
14.4.8 Malfunctions on the counterweight hoist unit
14.4.9 Malfunctions in the hydraulic system/hydraulic oil cooler
Malfunction Cause Solution
Counterweight hoist unit
not working
Emergency stop switch on
à Emergency stop switch,
resetting
, p. 4 - 20
Control unit fuse blown Replace the blown fuse;
à p. 14 - 72
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 logi-
cal error
Extend lifting cylinder not
working
Superstructure unlocked
à Locking the turntable,
p. 11 - 15
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 - 72
Faulty temperature sensor in
the circuit of the hydraulic
system, error message is dis-
played
Have the temperature
sensor replaced
Symbol is displayed Corresponding hydraulic oil
filter soiled
Change hydraulic oil filter;
à Maintenance manual
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