IS 25T - IS30T - IS34T
50 Hz
- 21
GB
GB
A second belt is used to transmit the rotary motion from the
drive shaft pulley to that of the closed-circuit coolant pump
and the battery charger DC alternator [Fig. 9 Ref. 3].
Adjust the belt tension as follows:
Loosen the adjusting screw [Fig. 9 Ref. 4] and move the
battery charger DC alternator [Fig. 9, Ref. 5] outwards to
increase the tension and inwards to decrease it.
The correct belt tension is such as to allow a yield of about
10 mm [Fig. 9] under a thrust force of 8 kg.
To prevent the belt from slipping,
do not dirty it with oil. Clean the belt with petrol if any
oil is spilled.
Keep hands away from the V-belt or
the pulleys when the engine is running.
7.8 Emptying the cooling system
To carry out maintenance on the water/air exchanger or on
the cooling system the seawater must be drained from the
intake circuit. This operation is carried out as follows:
- Close the sea intake cock [Fig. 6, Ref. 2]
- Open the drain tap [Fig. 6, Ref. 3] until all the water has
run out
- Close the drain tap.
Reopen the seawater intake cock
before starting the generator.
7.9 Coolant replacement
Annually replace the coolant in the closed cooling circuit as
follows:
- To remove the side counter(Fig.3, Ref.3) .
- Take a rubber hose of about 50 cm long with an inside
diameter of 30-40 mm.
- insert the pipe under the faucet (Fig.7, Ref.4) and connect
it to the inside of a container of about 10 litre capacity.
- Open the cap and completely drain the closed cooling
circuit.
When the operation has been completed, close the faucet
and fill the circuit with new coolant.
Dispose of the used coolant in an
appropriate manner as it is a polluting product.
Take the used coolant to special collection centres
responsible for disposal.
7.10 Zinc anode replacement
To protect the water/air heat exchanger [Fig. 10, Ref. 1] and
the water/coolant heat exchanger [Fig. 10, Ref. 2] against
galvanic current, two sacrificial zinc anodes [Fig. 10, Ref.
4] have been inserted inside them. Periodically check their
state of wear and, if necessary, replace them in order to
prevent that the galvanic current irreparably corrodes the
heat exchanger. It is recommended to check the zinc
anodes at least once a month when the generator is new
to check how fast consumption is, to then be able to act
accordingly.
It is, however, opportune to replace the zinc anodes at least
once a year.
Fig. 10 shows the points where the zinc anodes are
positioned.
7.11 Seawater pump maintenance
At least once a year check the integrity of the rubber rotor
of the seawater pump [Fig. 7, Ref. 5].
Before opening the seawater pump to inspect the rotor,
drain the seawater from the cooling system as described
in Paragraph 7.8.
To access the rotor, remove the cover [Fig. 7, Ref. 6] and
with the aid of a pair of pliers extract the rotor pulling it out
with force.
To remount a new rotor, repeat the operations described
above in reverse order.
7.12 Alternator maintenance
The alternator used on this model of generator is type
synchronous, self-energised, with electronic voltage
regulation. This model alternator, without manifold and
brushes, does not require particular maintenance operations.
The periodic checks and maintenance are limited to
removing any traces of damp and oxidation which might
damage it.
7.13 Battery maintenance
For starting all the generator models, it is recommended to
use an 70 A/h battery for ambient temperatures exceeding
0ºC, and 100 A/h for lower temperatures. Before installing
a new battery it is important that it undergoes a full charging
cycle.
At least once a month check the level of the electrolyte and,
if necessary, top up with distilled water. If the generator is
not to be used for a long period, it is recommended to
disconnect the battery and store it in a dry place at a
temperature over 10ºC and to carry out a full charging cycle
once a month.
If the battery is left completely flat
for long periods, there is a risk of irreparably damaging
it.
The positive terminal of the battery must be protected
with Vaseline to prevent corrosion and the formation of
oxide.
For top-ups with sulphuric acid,
ready solutions must be used.