Displacement pump operates, but output is low on down stroke and/or both strokes.

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

  • Tighten packing nut.
  • Replace piston packings and piston if necessary.
  • Service the intake valve ball check.


  • Tighten clamps on the rubber elbow.


  • Clean the fluid hose on the applicator.