Malfunctions in driving mode
7.4 Troubleshooting
7 - 20 3 302 633 en Operating Instructions GMK5250L
27.09.2017
7.4.3 Malfunctions in the transmission
Malfunction Cause Remedy
Transmission only shifts up
to second gear
Transmission oil too hot
à On the transmission,
p. 7 - 28
Gear oil colder than approx.
-7 °C (20 °F)
Wait until gear oil temper-
ature rises
Transmission is not
upshifting at speeds over
approx. 20 km/h (12 mph)
A locking procedure is not
yet completed
Lock the differential locks
Transmission not shifting Retarder switched on
à Switching off the addi-
tional brakes
, p. 5 - 43
The transmission does not
respond to the controls
Fuse F1/6 blown Replace blown fuses;
à p. 7 - 37
Transmission cannot shift
down as otherwise the
maximum permissible
engine speed would be
exceeded.
Braking the truck crane
Driving display indicates a
malfunction
The electronic gear system
has detected a malfunction
à Procedure during
transmission malfunctions
,
p. 7 - 4
Engine started before the
start menu is displayed
Do not start the engine
until the start menu is
displayed
Transmission diagnostics
plug not working
Fuse F1/2, F4/7 blown Replace blown fuses;
à p. 7 - 37
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