Malfunctions in driving mode
7.7 Troubleshooting
Operating manual GMK 6400 3 112 993 en 7 - 33
12.07.2013
7.7.7 Differential lock malfunctions
7.7.8 Malfunctions in the hydraulic system/hydraulic oil cooler
Malfunction Cause Remedy
Differential locks cannot be
switched on
Current speed over approx.
5 km/h (3 mph)
Slow down or stop the
truck crane
Drive train under tension Slowly drive truck crane
back back and forth,
à p. 5 - 58
Compressed air system
insufficiently filled
à Building supply pressure,
p. 5 - 9
Fuses F2/1, F4/6, F5/4, F5/7
blown
Replace blown fuse;
à p. 7 - 20
Differential locks cannot be
switched off
Current speed over approx.
5 km/h (3 mph)
Slow down or stop the
truck crane
Drive train under tension Slowly drive truck crane
back back and forth,
à p. 5 - 58
Error symbol is displayed ECOS malfunction Read out error messages
(
à p. 7 - 35) and notify
Manitowoc Crane Care
Malfunction Cause Remedy
Hydraulic oil temperature
above 80°C, fan in the hydrau-
lic oil cooler is running
Hydraulic system under
extreme strain and ambient
temperature very high
Stop the truck crane while tak-
ing the traffic situation into
account and run the engine
until the oil has cooled down
Hydraulic oil temperature
above 80°C, fan in the hydrau-
lic oil cooler is not running
Fuse F1/3 on carrier blown Stop the truck crane while tak-
ing the traffic situation into
account, and replace the
defective fuse;
à p. 7 - 20
Defective temperature sensor
in the hydraulic system (error
message is displayed)
Have the temperature sensor
replaced
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