• Mixing shaft faulty; no original PFT mixing shaft. Adjust to normal setting, readjust or replace pump components?
• Pressure reducer misadjusted or faulty Eliminate any other faults?
• Rotor worn, faulty?
• Stator worn or too loose at clamp?
• Clamp faulty (oval)?
• Inner wall of mortar hose faulty. Replace mortar hose?
• Rotor too deep in pressure flange. Check mixing shaft and motor catch?
• No original PFT spare parts?