When using a diesel generator set, it's important to understand that timely power supply is a crucial aspect:
First, checking the starting solenoid valve. A common method for checking generators is "look, listen, touch, and smell." Listening during startup is essential. For example, with a genuine American Cummins generator, simply press the start button; it should start after three seconds. You should hear two "clicks" within those three seconds. If you don't hear the second click, check the starting solenoid valve. If the solenoid coil is burnt out, the generator won't start.
Second, checking the battery pack. Since backup power isn't frequently used, the generator's ability to start depends heavily on battery maintenance. A common problem with the battery pack is voltage but no current. You might hear the solenoid valve engaging in the starter motor, but it won't turn the shaft. There are three main reasons why the generator might fail to stop:
1. Stopping battery charging during testing can lead to insufficient battery power.
2. The mechanical oil pump, driven by a belt, delivers a large volume of oil at its rated speed. However, insufficient battery power causes the spring plate in the shut-off valve to fail to seal the fuel sprayed from the four outlets due to insufficient solenoid valve suction when the unit stops, preventing shutdown.
3. Domestically produced batteries typically have a lifespan of two years and are not replaced regularly.
Thirdly, diesel fuel and lubricating oil inspection is crucial. Because the unit operates in a static state for extended periods, its various materials undergo complex chemical and physical changes with engine oil, coolant, diesel fuel, and air, potentially damaging the unit. Therefore, attention must be paid to oil quality. For fire safety, diesel fuel tanks are usually placed in a sealed room. However, atmospheric moisture condenses due to temperature changes, forming droplets that adhere to the inner wall of the tank and flow into the diesel fuel, causing excessive water content. Such diesel fuel entering the high-pressure fuel pump of the diesel engine can corrode the precision coupling component-the plunger-severely damaging the unit. Generator lubricating oil has a shelf life. If stored for a long time, the physical and chemical properties of the lubricating oil will change, causing the lubrication condition to deteriorate when the unit is working, which can easily lead to damage to generator parts.
