Malfunctions during crane operation
14.4 Troubleshooting
14 - 22 3 302 819 en Operating manual
GMK3060
13.12.2018
14.4.8 Malfunctions in 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
engaged
à Resetting the emergency
stop switch, p. 4 - 20
Control unit fuse blown Replace blown fuse;
à p. 14 - 71.
Error symbol (!) is
displayed
Function disabled by CCS If required, acknowledge
error message once and
briefly switch off the ignition –
it if occurs again, notify
Manitowoc Crane Care
Electronic system has detected
an electrical or logical error
Hoist unit locking/unlock-
ing function not working
Lifting cylinders retracted Extend lifting cylinders;
à p. 12 - 69
Lifting cylinder extension/
retraction function not
working
Hoist unit not in the locked or
unlocked end position, symbol
yellow
Lock or unlock hoist unit
completely, symbol must be
green or red;
à p. 12 - 71
Extend lifting cylinder not
working
Superstructure unlocked
à Locking the turntable,
p. 11 - 19
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
running 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 - 71
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
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