Check if all the screws parts are in good condition without loose.
Check if the pneumatic tube is ok without leaking.
Check if the water filter is dry, if no, please drain water away.
Make sure the pressure regulator is setting right, we suggest 3 kg/cm2
Lubricate the transmission gears when needed (ISO VG320 ~ VG370)
Make sure the extension wiring is ok.
Check if the feeding rolls are clean, if no, please clean it immediately.
Check the control panel, make sure the switch, light and monitor are in normal conditions.
Make sure the solenoid valve is clean.