Malfunctions during crane operation
14.4 Finding and eliminating malfunctions
Operating Instructions GMK5250L 3 302 633 en 14 - 21
27.09.2017
14.4.9 Malfunctions in the hydraulic system/hydraulic oil cooler
14.4.10 Malfunctions when operating with the hand-held control
14.4.11 Malfunctions when inclining the crane cab
Malfunction Cause Remedy
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
The fuse is defective. Stop crane operation and
replace blown fuse;
à p. 14 - 63
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
Malfunction Cause Remedy
CAN lamp flashes or stays off
after connecting the hand-
held control
Some other socket is lacking a
bridging plug
Insert bridging plug;
à p. 11 - 22
Fuse is blown Replace blown fuse;
à p. 14 - 63
Motor will not start Ignition in the driver's cab
switched on
Switch off the ignition in the
driver's cab;
à p. 4 - 21
Pre-selected function cannot
be performed
Another function has been
pre-selected
Pre-select the desired function
Operation not possible Malfunction in the control
system
Manitowoc Crane Care must be
notified
Malfunction Cause Remedy
Crane cab inclination function
not working
Fuse is blown Replace blown fuse;
à p. 14 - 63
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