1. First, check for any loose parts or components. If everything is secure, verify that the operating current and voltage are within the normal range.
2. If the components, current, and voltage are all normal, the issue likely lies with the compressor head (air end), which typically requires replacement. Oil-free air compressors are built with much higher precision than standard models, necessitating a more controlled operating environment. Avoid installing or using them in areas with high levels of dust, and perform regular, thorough cleanings—while the unit is powered off—to ensure both the interior and exterior remain clean.
3. Excessive noise can also be caused by worn-out motor bearings or piston seals (cup seals); in such cases, the affected parts must be replaced.
II. Equipment malfunction due to improper setup
1. Before starting the air compressor, ensure that the pressure in the connected storage tank is set to zero. If the compressor head rotates too slowly and emits a humming sound, it is often because the check valve is obstructed by debris, preventing it from functioning correctly. Since the check valve’s purpose is to allow gas to flow into the storage tank, any foreign object interfering with its internal seal (diaphragm/flap) can cause backflow (leakage).
2. If the air compressor fails to start on the first attempt and remains unresponsive during a second attempt, consider the possibility that a foreign object is obstructing the check valve. In this scenario, you can use a wrench to open the check valve and clean it.