Caterpillar — After Storage (Drying the Generator)
Maintenance
From a Caterpillar owner's manual covering: 7C-1000, 9Y-1300, 9Y-1400, SR4. Check it applies to your exact model before use.
Applies to: Caterpillar SR4
Before you start
- If an oven is used for drying, use a forced air type rather than a radiant type. Radiant ovens can cause localized overheating.
Procedure
- Perform an insulation resistance check of the main stator windings using a megohmmeter (megger).
- Energize space heaters in generator, if so equipped.
- Put the generator in an oven at a temperature of not more than 85°C (185°F) for four hours.
- Install space heaters of the same type used in marine applications to heat the windings and remove moisture.
- Use a canvas enclosure around the generator and heating lamps to increase the temperature; make an opening in the top for release of moisture.
- Send a low voltage current through the windings to increase the temperature of the windings; do not exceed 85°C (185°F).
Tools required
- Megohmmeter (megger) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oven temperature not more than 85°C (185°F) for four hours
- Do not exceed 85°C (185°F)
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.