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Checking the oil level
The oil level in the retarder normally only needs to be
checked when there is a problem with the retarder,
such as low braking torque, oil leakage or in certain
cases when an oil change has been done on the
retarder. To ensure the correct oil level in the retarder,
it is most suitable to perform the oil level check after
driving, when the oil is hot. The vehicle must be
standing horizontally.
1
Clean around the drain plugs (C), oil filler plug
(A) and breather plug (B).
2
Place a suitable vessel under the retarder to
collect the oil.
3
Remove the drain plugs, the oil filler plug and the
breather plug and let the oil run out of the
retarder.
4
Check the sealing rings on the drain plugs. If they
are damaged, the plugs must be replaced. Refit
the drain plugs and tighten them to 16 Nm.
5
Measure the collected oil volume, if necessary
correct it to the right oil volume,
or refill the retarder with new oil measured to the
right volume. For the correct oil change volume,
see Oil change volumes. For the correct oil grade,
see Oil grades.
6
Fill with oil through the filler hole. The filling
time should be at least 3 minutes to allow the
retarder system to ventilate through the breather
passage.
7
Check the sealing ring on the oil filler plug. If it
is damaged, the plug must be replaced. Refit the
oil filler plug and tighten it to 50 Nm.
Maintenance 573
Warning!
The retarder must be disengaged
when you check the oil level. Hot
oil can otherwise be forced out
from the retarder and cause burns.
Use protective gloves.
Note!
It is important for retarder function
that the oil level is correct.
B
C
A
J206945
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