PUMP AS-GEAR 7N4517 - Caterpillar

Personal injury or death can result from improper troubleshooting and repair procedures.The following troubleshooting and repair procedures should only be performed by qualified personnel familiar with this equipment.
The high voltage that is produced by an operating generator set can cause severe injury or death. Before performing any maintenance or repairs, ensure that the generator will not start.Place the engine control switch in the "OFF" position. Attach "DO NOT OPERATE" tags to all starting controls. Disconnect the batteries or disable the starting system. Lock out all switchgear and automatic transfer switches that are associated with the generator.
Refer to Safety Section, "Generator Isolating for Maintenance" for information regarding the procedure to isolate the generator safely.Proper maintenance of electrical equipment requires periodic visual examination of the generator and periodic visual examination of the windings. Proper maintenance of electrical equipment also requires appropriate electrical checks and appropriate thermal checks. Insulation material should be examined for cracks. The insulation material should be examined for accumulations of dirt and dust. If there is an insulation resistance value that is below normal, a conductive path may be present. This conductive path may be made of one of the following materials:
Carbon
Salt
Metal dust
Dirt that is saturated with moistureThese contaminants will develop a conductive path which may produce shorts. Cleaning is advisable if heavy accumulations of dirt can be seen or if heavy accumulations of dust can be seen. If excess dirt is the cause of a restriction in the ventilation, cleaning is also advisable. Restricted ventilation will cause excessive heating.
To avoid the possibility of deterioration to the generator windings, do not clean the generator unless there is visual, electrical, or thermal evidence that dirt is present.
If harmful dirt accumulations are present, various cleaning techniques are available. The cleaning procedure that is used may be determined by one of the items on the following list:
The extent of the cleaning procedure that is being attempted
The type of enclosure of the generator
The voltage rating of the generator
The type of dirt that is being removedCleaning (Assembled Generators)
Do not use water to clean the generator.
Do not use trichloroethane, perchloroethylene, trichloroethane, or any alkaline products to clean the generator.
Cleaning may be required at the point of installation. Complete disassembly of the generator may not be necessary or feasible. In this case, a vacuum cleaner should be used to pick up the following items: dry dirt, dust, and carbon. Cleaning the generator will prevent the spreading of these contaminants.A small nonconductive tube may need to be connected to the vacuum cleaner. The small nonconductive tube will allow the vacuum cleaner to clean the surfaces that are not exposed. After dust is removed, use a small brush attached to the vacuum hose to remove dirt that is firmly attached to the surface.After the initial cleaning with a vacuum, compressed air may be used to remove the remaining dust and dirt. Compressed air that is used for cleaning should be free of moisture and free of oil. Air pressure should be a maximum of 210 kPa