Sole Diesel 68 GTC, Operator'S Manual

Page: 37 / 82

Systems and scheduled
maintenance
Solé, S.A. C-243 b, km 2 · 08760 Martorell (Barcelona) ·Tel. +34 93 775 14 00 · www.solediesel.com · info@solediesel.com 34
Operator’s Manual . Marine generator sets
An excessive tension may cause a quick wear of the belt and alternator bearings. Otherwise, if the
belt is excessively loose or has oil and insufficient load, it can cause the belt to skid.
Never adjust the belt tension with genset running or battery connected
Maintenance task. Battery level
Battery requires a very careful handling and frequent checking. Proceed as shown below:
1. Keep battery dry and cleaned.
2. Check terminal cleanliness regularly. If dust is settled, terminals should be loosened,
cleaned and smeared with a neutral grease layer.
3. Metal objects must not be placed over the battery.
4. Add distilled water if the level is out of range.
5.9. Alternator
The maintenance and fault diagnostic procedures involve risks that may cause severe injury or even
death. These procedures should therefore be carried out solely by qualified electrical and mechanical
specialists. Before any maintenance and cleaning work make sure that there are no live parts that the
generator housing has cooled to ambient temperature, that the genset cannot be accidentally started
up and that all procedures are strictly observed.
Maintenance task. Control of windings and electrical insulation
The condition of the windings can be checked by measuring their electrical resistance to earth.
While running this test, disconnect the voltage regulator. It is usually sufficient to control the main
winding.
The readings should give a measurement of the least 1MOhms. If the insulation resistance is
below this threshold, the alternator alone should be oven dried at 60 – 80ºC for 3 hours. Before
carrying out this operation remove the voltage regulator. As an alternative to oven drying hot air at 60
– 80ºC can be blown through the alternator for at least 1 hour.
Maintenance task. Control of bearings
During maintenance control the condition of the bearing and check that no grease has leaked: the
lifespan of the bearings depends on the vibrations and axial strains they undergo (vibrations can
increase considerably with a bad alignment) and on the working conditions. So, check for any unusual
signs: vibrations, unusual noises.
If undue vibrations or noises appear after long-term usage, these could be due to a worn bearing that,
if damaged, has to be replaced. No maintenance is required for the total operating time:
Operating time
20.000 horas
A bearing lifespan is closely linked to the working conditions and environment.
Long periods of sustained vibrations can damage the bearing balls and their seat. Too high
humidity can emulsify the grease and encourage corrosion.
Intense vibrations caused by the motor or bad alignment of the components in the genset put
the bearing under stresses that will reduce its lifespan.