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546 Maintenance
The fan may therefore start when a thermostatically
controlled fan would not start.
Check the drive belts (Multi-V)
Check the engine drive belts. Replace belts if any
pieces of the groove have broken off.
The fan belts are tensioned automatically, which
reduces the risk of slip and increases service life. The
generator/compressor (air conditioning) drive belts are
not tensioned automatically and their tension must
therefore be checked. Contact your Volvo-garage.
Working on the electrical system
There are a number of jobs on the electrical system
which the driver may need to do himself, such as
changing fuses.
The truck has an alternator and when working on
the electrical system the following should be
observed:
1
When putting in batteries make sure they are
correctly connected
2
Never run the alternator with a disconnected
battery. The batteries and alternator must not be
disconnected while the engine is running
3
The negative terminal on the battery should
always be disconnected first and connected last,
for example, when changing the battery. This
reduces the risk for short circuits and sparks
which can be dangerous due to hydrogen gas
4
Help-start batteries must be correctly connected
to prevent damage to the rectifiers in the
alternator, positive to positive and negative to
negative
5
When charging the batteries at least one of the
battery cables (negative or positive) must be
disconnected
6
When working on the electrical system of the
truck, the current must be switched off
Caution!
So-called start help units must not
be connected, because these can
give very high voltages, which
can in turn damage control units.
J0008252
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