Checking The Air Drier - Volvo FM Handbook

576 Maintenance
regenerated (dried) by allowing a certain amount of
the pumped air to flow back through the drier. The
system pressure drops during this process. If the
compressor has pumped a large amount of air, the
compressor may start up again before the required
amount of air has flowed back. This will result in a
number of compressor charging and regeneration
phases in sequence, until the required amount of air
has flowed back. This is quite normal.

Checking the air drier

Drain the primary and circuit tanks at least once a
week, or when the symbol for moisture is displayed. If
any of the tanks contain water, the desiccant must be
replaced and the air drier checked at a Volvo
workshop.
The desiccant in the braking system shall be replaced
every other year or when the symbol for replacement
of desiccant is displayed. If this function is not
activated, the replacement interval is every 12 months.
Use only Volvo original desiccant inserts, which have
a built-in oil filter .
The symbol has several meanings,
see section Display. In order to find
out why the symbol is lit,
look up the fault message in the
display diagnostic menu.
Note!
Do not use frost protection (alcohol)
in trucks with air driers.
J5012263
J5013654