TEKSAN DIESEL GENERATOR SETS, Operation And Maintenance Manual

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5.2.Maintenance of the Diesel Engine
Please see the detailed instructions in “Diesel Engine Operation and Maintenance Manual” supplied with the
diesel engine.
5.3.Maintenance of the Alternator
Any maintenance or repair activity to be performed on alternator, must be carried on by trained and qualified
technicians. Also be sure that the alternator is not running and all necessary precautions are taken before taking
action.
The maintenance intervals are specified depending on the alternator, operation mode and environmental conditions.
In general the alternator must be checked for any vibration, detonation, abnormal sound before commissioning and
one (1) year (or after 500 running hours) after it. Also the tightness of all electrical or mechanical connections and
any defections on the alternator body or the cooler fan must be checked during these maintenance activities.
Alternator bearings can be used up to 20.000 running hours under normal conditions, but some factors like improper
lubrication, very high ambient temperature or high levels of vibration will be decreasing this lifetime period.
The recommended check and change period for the lubricant (grease) is 4.000 hours. Some recommended lubricant
(grease) types are as follows; Mobilux 3 (MOBIL OIL), Alvania 3 (SHELL), GR MW 3 (AGIP), Beacon 3 (ESSO).
The temperature at the alternator bearings level must not exceed 60°C. In case of any doubt about corrosion on
bearings, the operating temperature must be measured and checked. Check the coupling, if the temperature is rising
up to 80°C during operation. If it is normal but the bearings change colour to blue, then the bearings must be replaced
with a new one. Any dismantled bearing must be replaced with a new and equivalent one, it is not recommended to
re-install and use any dismantled bearing. Heating the bearing up to 80°C will ease the assembling process.
Check the mechanical connection and the centring between the coupling of alternator and the flywheel of engine.
Make sure that all bolts on this connection are properly tightened. Sealants like “Loctite - Type 242” can be used on
this connection for providing extra strength.
Generally, alternators are manufactured with a single bearing. For this manner, the user must be very careful while
lifting or carrying it. Because the rotor can drop down if the alternator is lifted, so the rotor must be fixed before lifting.
It is strongly recommended to perform an insulation test on stator windings, if the alternator has not running for a long
time. Be sure to remove all the terminal connections on AVR before this insulation test. If the measured resistance
between the stator winding and the ground is lower than 5 Megaohms, then the alternator must be cleaned, dried
and maintained properly. Related industrial cleaners can be used for this cleaning purpose.
Wait for some time after applying cleaner on windings, then blow compressed air to remove
this volatile substance on it.
Please see the detailed instructions in “Alternator Operation and Maintenance Manual”
supplied with the alternator.