Maintenance work on the carrier
7.13 Steering
07.12.2017
Maintenance manual 3 302 649 en 7 - 83
GMK4090
7.13 Steering
7.13.1 Checking the steering monitoring
Checks in the
driver's cab
• Consult the operating instructions regarding lights and symbols for steer-
ing monitoring in the driver's cab;
à Operating manual.
• Start the engine and observe the display.
• If after the engine is started the symbols go out, the steering system is free
of defects.
If the symbols light up yellow or red, or flash, they are indicating the
respective malfunction in the steering system;
à Operating manual.
• Switch the engine off.
Checking at the
travel gear
There are a total of 5 electrical angle sensors at the 1st, 3rd and 4th axle line,
for measuring the steering angle at the respective axle line.
The measured values are sent to two steering computers. If the steering is
out of position, the steering computers send a malfunction message to the
display in the driver's cab;
à Checks in the driver's cab, p. 7 - 83.
During the course of an inspection not less than every two years you must
have all the event messages in the steering computer read.
Intensive off-road driving can cause damage to the angle sensors. Depend-
ing on the operating conditions of the truck crane it is therefore advisable
to perform a daily visual check of the angle sensors;
à Checking the angle
sensors
, p. 7 - 84.
s
S
Risk of accidents because the truck crane cannot be steered
Stop as quickly as possible if the red lamp lights up.
The 3rd and 4th axles can steer in an uncontrolled manner, which may lead
to serious accidents, even when driving at reduced speed.
G
Risk of crushing due to turning wheels
When you start the engine, no persons may be within the steering range of
the 3rd and 4th axle lines. These axle lines are steered each time the engine
is started, sometimes with a 5-second delay, in order to test the steering
system.
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