Volvo FM Handbook page 575

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564 Maintenance
Replenishing oil level in transfer gearbox
When the oil level in the transfer box is too low, it
must be topped up with oil. The following then
applies:
• If the same oil is used to top up the transfer box as
the one already in the transfer box, there is no limit
to how much oil can be filled or how many times
the oil level can be replenished.
• If approved oil other than the one already in the
transfer box is used for topping up, then no more
than 0.5 litre may be used. This applies regardless
of how many times the oil is topped up to the
correct level. If more oil needs to be added, carry
out a complete oil change instead
Oil change after repair of transfer box
If a component has been repaired, renovated or
opened, an extra oil change must be carried out. This
oil change must be carried out at 10,000 km or 4
weeks, whichever is first, after a component has been
repaired, overhauled or opened. When the extra oil
change has been completed, the component's normal
service recommendation applies.
Checking the oil level
1
Check that the oil level is between the centre and
the maximum level on the transparent level plug
in the transfer gearbox (A) (maximum and
minimum oil level, see picture)
2
Top up with oil as necessary, but first clean
round the filler plug (B)
3
Unscrew the filler plug (B) and fill with oil until
the oil level is between the centre and the
maximum level on the transparent level plug (A)
(maximum and minimum oil level, see picture)
4
Refit the filler plug (B). If the seal ring on the
plug is damaged, change the seal ring
Note!
Do not undo the transparent level
plug.

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