Replacing Zinc Anodes; Maintenance Of The Alternator; Maintenance Of The Battery; Periods Of Stoppage - Mase Generators IS 9000 Manuel D'instructions Et D'entretien

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- close the drainage tap.
CAUTION
Remember to open the sea water inlet tap again
before restarting the generator group.

5.8 Replacing zinc anodes

Two zinc anodes have been inserted to protect the
water-air heat exchanger from galvanic currents. They
must be checked at regular intervals for wear, and
replaced if necessary, to prevent irreparable corrosion
of the heat exchanger by galvanic currents. It is recom-
mended that these zinc anodes be checked at least once
a month when the group is new, to give a general idea of
the speed of wear, after which the control intervals can
be adjusted accordingly. In any case it is advisable to
replace the zinc anodes at least once a year.

5.9 Maintenance of the alternator

The alternator used on this model of generator is a
synchronous, self-excited on, with electronic voltage
regulation. Periodic controls and maintenance opera-
tions relate to: the brushes, the commutator, and the
Viton bush inside the bearing housing.
- Brushes: check for wear and breakage every 500
working hours. The brushes can be accessed by
removing the hood on the alternator side of the casing
[fig. 1, ref. 3] and the plastic air feeder [fig. 9, ref. 1] fixed
to the cover on the bearing side of the alternator.
Disconnect the red and black wires connected to the
brush holder [fig. 9, ref. 2], and remove the two screws
fixing the brush holder to the cover.
If the brushes are found to be broken or worn, replace
them.
- Commutator: check the commutator before starting
the generator group after a long period of inactivity. This
is necessary to check the state of wear and to eliminate
any oxidation that may have formed, which would pre-
vent current from passing through the brushes. Any
oxide on the commutator can be eliminated by sanding
lightly with very fine sandpaper. If the commutator
shows deep grooves created by the rubbing of the
brushes, these must be eliminated using a lathe.
The commutator is accessed following indications given
above for the brushes.
- Viton bush: this must be replaced every 1000 working
hours, or every two years. The Viton bush, which is
positioned inside the bearing housing [fig. 9, ref. 3], can
be accessed after removing the cover from the alterna-
tor [fig. 9, ref. 4].
GB
CAUTION
The operations described above must only be per-
formed by specialised personnel, or by technicians
from one of the MASE service centres.
WARNING
Pay particular attention to the way the alternator
cover is replaced, ensuring that the four tie rod nuts
are evenly tightened.

5.10 Maintenance of the battery

To start up the IS 9000-9500 generator group it is
recommended that you use a 55 A/h battery when the
surrounding temperature is 32°F or over, and a 70 A/h
battery when the surrounding temperature is lower.
Before fitting a new battery it is important that the battery
itself be fully recharged.
Check the level of the electrolyte in the battery at least
once a month, and top up with distilled water if neces-
sary.
If the group is not used for a long time it is recommended
that you disconnect the battery and store it in a dry place
at a temperature of over 50°F, recharging it once a
month.
INFORMATION
If the battery is left completely uncharged for long
periods there is a risk that it will be irreparably
damaged.
Take care to protect the positive pole of the battery with
vaseline grease, to prevent corrosion and the formation
of oxide.

5.11 Periods of stoppage

If the group is to be stopped for a long period, it is
necessary to proceed as follows:
- Replace the oil in the sump
- Replace the oil filter
- Replace the fuel filter
- Replace the zinc pads (see paragraph 5.8)
- At a temperature of below or close to 32°F, draw in
some antifreeze through the sea water inlet, to protect
the heat exchangers from low temperatures and lubri-
cate the sea water pump rotor.
- Lubricate the water pump rotor
- Disconnect the starter battery and store it in a dry place
(see paragraph 5.10)
- Clean the sea water filter
- Close the sea water inlet tap
- Empty the sea water out of the silencer
- Clean and lubricate the siphon break valve.
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IS 9000 - 9500