Maintenance and Service Methods for Diesel Generator Sets（一）
Daily Maintenance (Before and After Operation)1. **Exterior Inspection**
- Before starting the diesel generator set every day, conduct an exterior inspection of the unit. Check whether each component of the unit has signs of damage, looseness or leakage. Examine whether there are cracks on the body and whether the fixing screws of the casing are tightened. For example, check the fixing condition of the radiator. If the screws are loose, it may cause the radiator to shift and affect the cooling effect.
- Check whether there are leaks of fuel, oil and coolant. Fuel leakage may lead to safety hazards such as fire. Oil leakage will affect the lubrication of the engine, and coolant leakage will cause poor heat dissipation of the engine. Carefully check whether there are oil stains or water stains around the fuel tank, fuel pipes, oil pan, cooling water pipes and other parts.
2. **Liquid Level Inspection**
- Check the fuel level in the fuel tank. Ensure that the amount of fuel is sufficient for the running time required by the unit. Different power units consume fuel at different speeds. Generally, it is necessary to ensure that the fuel level is above one-third of the tank capacity to avoid sudden shutdown due to fuel depletion during operation.
- Check the oil level. Oil is the "blood" of the engine, which plays a role in lubricating, cooling and cleaning various moving parts of the engine. Pull out the dipstick, wipe it clean, insert it again, and then pull it out again to observe whether the oil level is within the normal scale range on the dipstick. If the level is too low, it is necessary to add oil that meets the requirements of the unit in a timely manner.
- Check the coolant level. The coolant is mainly used to cool the engine and prevent it from overheating. Open the lid of the coolant tank (be careful to operate after the engine has cooled down to avoid being scalded by high-temperature steam), and observe whether the coolant level is within the specified range. If the level is insufficient, add an appropriate amount of coolant, and pay attention to the proportion of the coolant. Generally, it is a mixture of antifreeze and water in a certain proportion.
3. **Electrical System Inspection**
- Check the terminals of the generator. Ensure that all wire connections are firm and there are no signs of looseness or corrosion. Loose connections may lead to poor contact, generate electric sparks, and thus damage electrical equipment or cause fires. If corrosion is found on the terminals, you can use special electrical cleaners and tools to clean and tighten them.
- Check the battery. The battery is a key component for starting the diesel generator set. Check the electrolyte level of the battery to ensure that the level is above the plates. At the same time, check whether the positive and negative connections of the battery are firm and whether there is oxidation. If oxidation is found, it can be cleaned with a baking soda solution, rinsed with clean water, and then the connections can be retightened.
4. **Inspection After Operation**
- After the diesel generator set finishes running, let the unit idle for a few minutes so that all parts of the engine can be cooled evenly. During this process, pay attention to observing the running state of the unit, such as whether there are abnormal noises or vibrations.
- Check the fuel, oil and coolant levels again, because there may be certain consumption during the operation process. At the same time, check whether the exhaust system is normal and whether the color of the exhaust is normal. The normal color of the exhaust should be light gray. If the color of the exhaust turns black or there is blue smoke, it may indicate that the engine is not burning fully or oil has entered the combustion chamber, and further inspection is needed.
