Operation Manual

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.