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Maintenance and repair of common faults in oil-free air compressors: 1. The oil-free air compressor keeps running, but the air supply is still insufficient. The compressor should stop operating once enough pressure is built up in the air storage tank. Use your ears to check whether there are any signs of air leakage at the connections of all the external pipes of the oil-free air compressor, as well as at the air supply pipes connected to the air tank, one-way valves, safety valves, pressure switches, etc. If the above issues are ruled out, it could be wear and tear on the machine’s bowl, or one oil-free air compressor being used to power multiple treatment tables. It’s overloaded. As for a damaged rubber gasket, it needs to be replaced; the typical lifespan of such gaskets is around 3 years. 2. The oil-free air compressor operates intermittently, resulting in insufficient air supply. The cause of this fault is: insufficient voltage at A. There is a buzzing sound when it starts up. If it is observed that the operating current at this time is greater than 5 amps, (the normal operating currents for common 520-watt and 840-watt oil-free dental air compressors are 2.8A and 3.8A respectively). The minimum operating voltage for the oil-free head is 198V; below this voltage, it is difficult to start the head, and frequent starting will cause the head’s temperature to rise. The circuit ultimately shuts down for protection. Turn it on again once the temperature drops. It is recommended to buy a small voltmeter and install it at the power source for easy monitoring. (A small voltmeter only costs 5 yuan each.) ) Install an automatic voltage stabilizer in case of low voltage issues. B start capacitor is leaking. When there is capacitance leakage, the oil-free air compressor unit can still start, but its speed is reduced and the current increases. Due to this higher current, the unit heats up rapidly, and it stops operating as a result of protection mechanisms being triggered. For this issue, just use a new one, but make sure the UF value is the same; it’s not good if it’s too high or too low. 3. Oil-free air compressors must reduce the pressure in the air storage tank to zero before they can start operating each time they are used. Otherwise, it cannot be started; when powered on, the head rotates very slowly and there is a humming sound. The current is also high. This is because a component called a check valve has been clogged with dirt; it is connected at one end to the exhaust pipe of the machine (or the high-pressure pipe) and at the other end to the air tank. It is usually made of copper; some manufacturers use iron for it, and it has three outlets. Its function is to ensure that the gas emitted by the nozzle enters only the gas cylinder, while preventing the gas from the cylinder from escaping; it contains a spring and a rubber strip inside. If dirt gets stuck in the film, it causes reverse air leakage, and attempting to restart the machine will result in high pressure preventing it from starting. The solution is to use a wrench to open the valve cover behind the check valve, clean it, and then reinstall it as it was. 4. The oil-free air compressor can operate, but its noise level is significantly higher than before. After ruling out the possibility that the components on the machine are loose, check whether the operating current is normal. Normally, this is due to the machine having been in use for some time. Oil-free air compressors should be placed in an environment free from dust; regularly unplug them and use high-pressure air to blow away the dust from their surfaces as well as from the blades at both ends. Excessive noise is caused by dust wearing down the bearings of the four motors – the Guangshun factory, which sells the largest volume of such compressors in China, uses Japanese NSK bearings of good quality – and the rubber seals are also affected as a result. Tools and accessories that require replacement use specialized oil-free air compressors.