Pump will not prime properly or pumps air.

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

  • Open air valve.
  • Clear clogged air line.
  • Increase air pressure.


  • Replace piston.
  • See manual 311762.
  • Open hand valve.
  • Clear hand valve.
  • Clean hand valve.
  • Service hand valve.