FITTING 5W0464 - Caterpillar

Gearbox Heater
The gearbox can operate in normal ambient conditions without problems. Low and high oil temperatures can result in damage to the gearbox oil pump and sensors due to high or low pressure. Whenever the gearbox is not operating, ensure that the gearbox oil heater is operating to maintain an oil temperature between 30° C (86° F) and 60° C (140° F).During operation, as the oil temperature rises, the gearbox radiator thermostat and fan operate to cool the gearbox. Operations of the heater and fan are controlled by the EMCP. A 400 VAC external power source is required to operate the gearbox fan motor. This power source should be an emergency circuit powered by the generator set to ensure that proper gearbox cooling ensues once the unit is able to take load.The gearbox heater can be operated while the gearbox is operating. A built-in thermostat will turn off the heater element as the oil temperature rises.A 120 or 240 VAC external source is required to operate the gearbox heater. The external power source voltage depends on the heater utilized on the unit. Confirm the voltage required for your specific unit prior to connecting power.Space Heaters
The generator can operate in high humidity conditions without problems. However, problems can occur when the generator is idle and the surrounding air is warmer than the generator. Moisture can form on the windings that will result in poor performance from the windings. Moisture can also result in damage to the windings. Whenever the generator is not active, ensure that the space heaters are in operation.Whenever the generator is operating, ensure that the space heaters are disconnected.An external source of either 115 VAC or 230 VAC is required to operate the space heaters.
Illustration 1 g00556903
Space Heater Connection to External Source (H1) ( H2) ( H3) and (H4) Terminals.
If a 115 VAC source is available, connect both heaters in parallel across the source. If a 230 VAC source is available, connect both heaters in series across the source. Refer to Illustration 1.Field Conditions that Reduce Insulation Life
Electric machines and associated insulation systems are exposed to the following types of stress: mechanical, electrical, thermal, and environmental. These stresses produce many deteriorating influences. The following list defines the most significant influences.Thermal Aging - Thermal aging is the deteriorating influence on insulation that is caused by the normal service temperature.Over-temperature - Over-temperature is the unusually high temperature of operation that is caused by the following conditions: overload, high ambient temperature, restricted ventilation, winding faults and foreign materials that are deposited on windings.Over-voltage - Over-voltage is a voltage that is much higher than the rated nameplate voltage. This voltage can be caused by switching surges or lightening surges. Operating above the rated nameplate voltage will reduce the life of the insulation.Contamination - Contamination deteriorates electrical insulation in the following ways:
conducting current over insulated surfaces
attacking the material and reducing the quality of the material electrical insulation
attacking the material and reducing the material physical strength
creates thermal insulation that causes the material to