PUMP GP-UNIT INJECTOR HYD 10R7053 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Space Heaters
Space Heaters are recommended for SR4 generators that are installed in high humid conditions.The SR4 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 and result in poor performance and even result in damage to the windings. Whenever the generator is not in use, insure that the space heaters are in operation.Whenever the generator is operating, insure the space heaters are disconnected.An external source of either 115 or 230 volts AC (200V at 50 Hz) is required to operate the space heaters. Space Heater Connection to External Source H1, H2, H3, H4 Terminal Strip Terminals.If 115 VAC source is available, connect both heaters in parallel across the source (L1-L2). If 230 VAC source is available, connect both heaters in series across the source (L1-L2).Recommended Periodic Resistance Checks
Use a megohmmeter (megger) to check generator main stator winding insulation resistance periodically. The frequency of the insulation resistance test is determined by the generator's environment and by previous megohmmeter test indicators. Test the main stator windings with a megohmmeter (megger) in the following situations:1. Before initial startup of generator set.2. After generator storage.3. Every three months if generator is operating in a humid environment or is not protected from the elements by an enclosed area.4. Every six months if the generator is installed in an enclosed area with relatively low humidity and minimal temperature variations.5. If generator has not been run under load for three months or more.6. Test every week and use space heaters if the generator is exposed to a sea water environment or if the surrounding conditions are very humid (relative humidity above 75%) or if a recent test reading was less than three megohms. In applications where salt and high humidity are present, space heaters must be operated whenever the generator is not operating under load. This is the only way to maintain megohmmeter test readings above one megohm.The insulation resistance check is described in Special Instruction SEHS9124. A reading of one megohm or less indicates that the winding has absorbed too much moisture.This is a guideline only. It may be necessary to megger more frequently if the environment is extremely humid, salty or if the last megger test was close to one megohm.Clean and Inspect
Before working inside the generator, make sure that the starter motor can not be activated by any automatic or manual signal.When the engine-generator is operating, voltages up to 600V are present in these areas near or on the regulator:1. the regulator terminal strip.2. the excitation transformer terminal strip (self-excited generator only).Do not short these terminals to ground with any part of the body or any conductive material. Loss of life or injury could result from electrical shock or injury from molten metal.An electrical