Checking The Reservoir Pressure - Mercedes-Benz Unimog Operating Instructions Manual

key, the on-board computer will show an
event window. Use a valid spare key.
X
Check the engine oil level (
X
Shift into neutral.
X
Make sure that the engine-driven power
take-off is disengaged (
X
Make sure that the front PTO shaft is dis-
engaged ( Y page 268).
X
Turn the key to start position 3 in the igni-
tion lock. Do not depress the accelerator
pedal whilst doing so.
X
If the engine starts normally, release the
key.
The idling speed is controlled automati-
cally.
The engine idling speed is raised at very
i
low outside temperatures or during regen-
eration of the diesel particle filter.
The starting procedure is automatically
cancelled after approximately 60 seconds.
X
If the engine fails to start: rectify the cause
of the poor starting characteristics.
Possible causes of poor starting characteris-
tics are, for example:
a blocked fuel filter
R
an empty fuel tank (
R
fuel system not bled (
R
X
Repeat the starting procedure.
X
If the engine still fails to start, contact a
qualified specialist workshop.
Safety inspection
Checking the reservoir pressure in the
compressed-air brake system
G
WARNING
It is not possible to brake the vehicle if the
compressed-air brake system has a leak or if
there insufficient reservoir pressure. There is
a risk of an accident.
Do not pull away until the required reservoir
pressures have been reached.
Y page 125).
Y page 265).
Y page 216)
Y page 322)
In the event of loss of pressure while driving,
immediately bring the vehicle to a halt in
accordance with the traffic conditions.
Secure the vehicle using the parking brake.
Have the compressed-air system repaired at a
qualified specialist workshop.
X
Start the engine.
X
Leave the engine running until the J
warning lamp in the instrument cluster
goes out.
X Reserve pressure
Call up the
dow ( Y page 124) and check the current
reservoir pressure.
Observe the event window in the on-board
computer and the indicator lamps in the sta-
tus area of the on-board computer/instru-
ment cluster on the reservoir pressure and
the compressed-air brake system.
Checking the reservoir pressure in the
transmission/clutch circuit
G
WARNING
If there is a loss of pressure or insufficient
reservoir pressure in the transmission/clutch
circuit, you can no longer shift gears. There is
a risk of an accident.
Do not pull away, or stop the vehicle as soon
as possible, paying attention to road and traf-
fic conditions. Secure the vehicle against roll-
ing away, e.g. with the parking brake. Have
the compressed-air system repaired at a
qualified specialist workshop.
The reservoir pressure in the transmission/
clutch circuit is supplied once brake circuits 1
and 2 have been charged.
If the reservoir pressure in the transmission/
clutch circuit is too low, the on-board com-
puter displays the yellow :
sion/clutch reserve pressure too
lowevent window.
X
Start the engine.
X
Leave the engine running until the yel-
Transmission/clutch
low :
Driving
161
menu win-
Transmis‐
Z