IMPELLER-CENTRIFUGAL 1487986 - Caterpillar

Pressure Air
The stator may be cleaned with filtered pressure air.Note: This is the least desired method of cleaning. In some instances, the air can relocate the dirt instead of removing the dirt.
Personal injury can result from air pressure.Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing.Maximum air pressure at the nozzle must be less than 205 kPa (30 psi) for cleaning purposes.
Never aim the pressured air directly against the insulation without first removing all of the moisture and contaminates from the insulation. Contaminates that are blown into the insulation and some areas of the generator may cause damage.
Carefully blow the dirt out of the windings by using 135 kPa (20 psi) to 205 kPa (30 psi) of filtered dry air.Extreme Cleaning
This method is for electrical equipment that has been submerged, flooded, or filled with dirt.Note: Even with the best treatment and careful testing, a generator that has been submerged sometimes fails when the unit is put back into service.
When water pressure is used for cleaning purposes, the pressure of the water must not exceed 172 kPa (25 psi) otherwise damage to the equipment may occur.
Flush the unit with fresh warm water to remove all traces of salt and silt. Washing should continue until tests of the fresh water show the insulation to be free of salt.Bake and dry the unit completely with externally applied heat before placing back into service. If necessary, apply varnish to seal the windings. Refer to the Drying Procedure.Note: If the Stator is used in environments or near environments that have salty air and/or high humidity, special electric component cleaners and protectors may be needed to prevent corrosion. Contact your Caterpillar technical communicator for recommendations.Drying Procedure
Note: External heat is the most preferable method. Insulation drying time can vary from a few hours to several days. This depends on the moisture content and the process for drying that is used.Note: Drying sometimes does not produce the required results. It may be necessary to use a qualified rebuild shop for dipping and drying of the Stator.Ovens
The best oven is a forced air drying oven for drying electrical equipment. Radiant ovens sometimes cause localized overheating.
Do not heat the generator too quickly. Try to limit the rise in temperature of the insulation and windings to 11.11° C (20° F) per hour. Failure to do so may cause equipment damage.
Note: Many electrical shops are equipped with baking ovens.Heat the generator to approximately 75° C (167° F). Never exceed 75° C (167°