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4. SERVICE
Performing routine service will help keep your generator running smoothly. The condition of the winding
and bearings should be examined periodically, especially if the generator has been idle for a long time.
Also, regular inspection and maintenance is required for generators fitted with air filters.
4.1 AIR FILTERS
Removal of filters exposes live parts. Unit must be OFF. Air filters for the removal of airborne
particulate matter (dust) are offered as an additional option. Filters need to be ordered concurrently with
the generator. Air filters need to be charged with oil before the engine-generator is used. Filter
maintenance periods will depend upon the severity of the site conditions. Regular inspection of the
elements will determine when cleaning is necessary.
4.1.1 CLEANING PROCEDURE
Remove the filter elements from their housings and wash the elements with a suitable degreaser material.
Dry the elements completely before charging.
4.1.2 CHARGING AIR FILTERS
The following must be done before using the unit for the first time, and after every filter cleaning. Soak
the filter element in SAE 20W50 oil or Filterkote Type K. Allow elements to completely drain before
reassembling the filters and putting the unit into service.
4.2 WINDING CONDITION
Service and troubleshooting procedures performed improperly can result in severe personal injury or
death. These procedures should only be performed by qualified personnel. Before carrying out any
service or troubleshooting procedure, be sure engine-starting circuits are disabled and any anti-
condensation heater supply is isolated.
Typical Insulation Resistance Values
The following information is provided to assist in determining the condition of the windings.
In operation, generators may be exposed to water. Units that have been in storage for may be exposed to
temperature and humidity variations, which can cause significant condensation. Wet windings must be
completely dried out before operating the generator. Otherwise, serious damage to the generator can
occur.
A new or unused generator will have an insulation resistance (IR) value of around 25 M, assuming it has
been stored in a clean, dry area. If the value is below 10 M, then the generator should undergo a drying
out procedure and tested again.
Generators in service should have an IR value above 1 M. If not, the generator should undergo a drying
out procedure and tested again.
If the IR rating for all phase-to-phase and neutral to phase measurements are above 1 M then the
windings are in working order. If the IR value is still below 1 M for any of the measurements, then the
windings may need to be replaced.
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