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

  • 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.

 

  • Use a hose with a larger ID.