Pump drive low lube pressure indicator on versa drill rig

Check hydraulic oil on sight level gauge on hydraulic tank, pumps would be making noise if oil level is low. Make sure all hoses are connected properly and not damaged. Check couplings and make sure they are plugged in properly. [pdf]

Fengxian screw air compressor low pressure

If the capacity of the air compressor is really too low, check the following: Check differential pressure over oil separator. Replace separator when necessary. Check and replace compressed air filters (if installed). Compressor does not unload. Check if pressure switch is correctly set and working. [pdf]

Screw air compressor back pressure

Adding back pressure will reduce over compression by maintaining the internal discharge pressure throughout the entirety of the discharge port. Essentially, vibrations within the compressor are reduced by forcing rapid expansion to occur in the discharge line instead of the discharge port. [pdf]