When an air compressor fails to reach the expected pressure, it can be caused by several common reasons:

1.Barometer malfunction: If the pressure displayed by the barometer is persistently low, even after a few minutes of engine operation at moderate speed, the pressure does not rise significantly, this may be a sign that the barometer has been damaged.

2.Transmission belt problems: Insufficient pressure can occur if the transmission belt between the compressor and the engine is too loose or slippery, or if the line from the compressor to the air tank is broken or the joint is leaking.

3.Clogged water separators, lines or air filters: If these components accumulate too much sediment and become clogged, it will seriously affect the normal operation of the air compressor.

4.Poor sealing of the exhaust valve: If the exhaust valve of the air compressor is not tightly sealed, the spring is too soft or broken, or the cylinder head bolts are loose, there is a sand hole, and the cylinder head gasket is damaged and causes air leakage, the pressure will not rise.

5.Piston and piston ring wear: If the cylinder liner and piston and piston ring wear are severe, it will lead to gas leakage, resulting in insufficient pressure.

6.Poor maintenance: Failure to properly maintain the air compressor, such as clogged air filters and oil separators, can also lead to a reduction in the exhaust volume of the machine.

7.The working pressure is set too low: If the working pressure of the air compressor is set too low, it may result in insufficient air pressure actually used.
8.Loading and unloading fault: Loading and unloading failure may cause the pressure to fail to rise, and it is necessary to check whether the loading and unloading solenoid valve, small piston or panel output near the intake valve is normal.
9.Intake valves are not fully opened: If the intake valves are not fully opened, it will also affect the performance of the air compressor.

In the face of these problems, meticulous inspections and necessary repairs are required to ensure that the air compressor can return to normal operation. If it is difficult to troubleshoot and solve the problem by yourself, it is recommended to contact a professional maintenance service in time to deal with it. Through these measures, it can be ensured that the performance of the air compressor can be fully utilized to meet the needs of the work.