Air Inlet – Check inlet for blockage

Regulation Valve Closed Control Group Not At Zero – Position the lever

Valve or Site of Inlet Valve & Delivery Worn or Dirty – Replace or clean

Worn Valve or Sit of Regulation Valve – Replace or clean

Valve or Site of Inlet Valve & Delivery Worn or Dirty – Replace or clean

Insufficient RPM’s – Bring the RPMs to 350-550

Worn Nozzles Used or Holes Too Big – Replace

Valve or Site of Inlet Valve & Delivery Worn or Dirty – Replace or clean

Air Inlet – Check inlet for blockage

Pressure Accumulator Discharged Or With Incorrect Air Pressure – Bring air to correct pressure

Broken Diaphragm – Drain oil, clean internal parts, replace with new diaphragm and fill with new oil. Be sure to eliminate air bubbles from crankcase

Air Bubble In Crankcase – After refilling with new oil, it is imperative to turn the crankshaft while rocking the pump side to side and in all directions if possible, without spilling oil. The more diaphragms a pump has, the more this needs to be done in order to purge ALL air bubbles out of the new oil before restarting. Failure to do so will result in an immediate diaphragm failure, or white oil despite no diaphragm failure.

Click the link below to see what issues may cause a diaphragm failure.

Diaphragm Failure Chart